JP2006040322A - Disk unit and navigation device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a disk unit and a navigation device capable of accurately reading information recorded in a recording medium. <P>SOLUTION: A CPU 7 calculates the traveling speed of a vehicle on the basis of vehicle speed pulse signals detected by a speed detection part 12, reads a servo gain related to the calculated traveling speed of the vehicle from a storage part 8, and supplies the read servo gain to a DSP 4. The DSP 4 generates servo control signals for executing servo control on the basis of the servo gain supplied from the CPU 7 and supplies the generated servo control signals to a servo driver part 5. The servo driver part 5 supplies a prescribed driving voltage to an optical pickup 2 so as to execute prescribed servo control on the basis of the servo control signals supplied from the DSP. Thus, the optical pickup 2 reads the information recorded in the recording medium 20. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

The present invention includes a CD (Compact Disk), a DVD (Digital Versatile Disk) and an MD (
The present invention relates to a disk device that reads information on a recording medium such as a mini disk or records information on a recording medium, and a navigation device that incorporates the disk device and performs route guidance.

  2. Description of the Related Art Recently, a disk device that reads and writes information from and to a recording medium, such as an optical disk device that reads information recorded on a recording medium such as a CD (Compact Disk) and a DVD (Digital Versatile Disk), or records information on the recording medium. Is popular. Hereinafter, in order to make the description easy to understand, an optical disk device will be described as an example. In a conventional optical disk apparatus, a recording medium is irradiated with a light beam, light reflected by the recording medium is received, a predetermined signal is read, a servo error signal is generated from the read predetermined signal, and the generated servo By adjusting a servo gain that is a gain of the error signal, for example, a focus servo gain and a track servo gain, the information recorded on the recording medium is read.

  For example, when a conventional optical disk device is used mounted on a moving body such as a vehicle, even if the servo gain is adjusted at the start of reproduction of the recording medium, depending on the road surface condition and the driving condition of the vehicle being moved by the vehicle Vibration may be applied to the optical disk device. Thus, when vibration is applied to the optical disk device or a scratch is formed on the recording medium, the information recorded on the recording medium cannot be read accurately, and the recording medium is reproduced. A so-called sound skip occurs in which the output sound changes discontinuously. Therefore, the conventional optical disk apparatus includes an RF (Radio Frequency) amplifier having a vibration detection terminal, and when the reading of information on the recording medium becomes unstable due to vibration or scratches formed on the recording medium, the RF amplifier A vibration detection (abbreviation: VDET) signal is output from the vibration detection terminal, and when the VDET signal is output from the vibration detection terminal, the servo gain such as the focus servo gain and the track servo gain is adjusted, and the recording medium The recorded information can be read stably, and the sound skipping is prevented from occurring as much as possible. Conventional techniques relating to an optical disc apparatus that prevents the occurrence of sound skipping by adjusting the servo gain are described in, for example, Patent Documents 1 to 5.

  In the conventional technique described in Patent Document 1, a vibration detection device is fixed to a frame, and the vibration amount and acceleration at the installation location are detected by the fixed vibration detection device, and the detected signal is configured by a microcomputer. Is input to the gain setting means. The gain setting means determines the gains of the focus servo and tracking servo based on vibration modes such as amplitude, acceleration, and vibration direction, and sets those gains to the focus servo and tracking servo, respectively. It is configured to prevent the occurrence of deterioration.

  In the conventional technique described in Patent Document 2, a focus servo control unit or a track servo control unit is provided in the servo control unit, and the non-volatile memory has a gain that enables the servo to be in an optimum state during factory adjustment. To set. During operation, the servo gain determination unit reads the gain setting value from the nonvolatile memory, sets it to the variable gain amplifier in the focus servo control unit or the track servo control unit, and performs servo control. Further, the gain is set in the variable gain amplifier in the track servo control unit so that the amplitude of the track error signal becomes equal to the target value calculated based on the gain setting value from the nonvolatile memory.

  In the conventional technique described in Patent Document 3, when vibration is applied in the tracking direction of the optical disc and vibration that may cause sound skipping in the in-vehicle CD player body is detected by the vibration detection means, the vibration detection means outputs the vibration. The vibration detection signal is input to the electronic sound source, warns the user that there is a risk of sound skipping due to the electronic sound from the electronic sound source, prompts the user to reduce vibrations, and increases the tracking servo gain. The vibration detection signal is also input to the means, and the gain of the tracking servo circuit is increased to improve the response to fluctuations in the tracking direction.

  In the prior art described in Patent Document 4, the gain of the servo loop is adjusted and changed to the optimum gain adjustment value for the signal level of the error signal, and the previous gain adjustment value stored in the storage means and the current gain adjustment change are changed. Is compared with the newly obtained gain adjustment value, and when the difference between the compared gain adjustment values is equal to or greater than a predetermined value, the gain of the servo loop is adjusted again, and a misadjustment is detected and an optical disc set error is detected. The discovery can be performed prior to the reproduction operation, and at the same time, it is possible to prevent the occurrence of a situation in which the servo is not applied or difficult to perform due to the misadjustment.

  In the conventional technique described in Patent Document 5, when the temperature around the optical pickup is detected by a temperature sensor and the detected temperature is different from a predetermined temperature range stored in advance in the memory, the focus is adjusted from the memory. Reads control data for controlling the gain and tracking gain, constantly updates the focus gain and tracking gain, and interrupts the reproduction or recording operation even if the temperature in the apparatus changes during the optical disk reproduction or recording operation The focus servo and the tracking servo can be performed without any trouble.

Japanese Utility Model Publication No. 5-21335 JP-A-5-242505 JP 9-44862 A JP-A-9-180208 JP-A-11-96566

  In the conventional technique described above, servo gains such as the focus servo gain and the track servo gain are not only when the reproduction of the recording medium is started but also when the VDET signal is output from the vibration detection terminal of the RF amplifier provided in the optical disc apparatus. It is configured to make adjustments. The VDET signal is generated when the reading of information recorded on the recording medium becomes unstable due to vibrations, and when the recording medium has a reflectance difference due to scratches formed on the recording medium. Output when reading information becomes unstable. In the conventional optical disc apparatus, it cannot be clearly distinguished whether the VDET signal output from the vibration detection terminal of the RF amplifier is a signal output due to vibration or a scratch formed on the recording medium. . Therefore, accurate servo gain cannot be adjusted according to vibration and scratches formed on the recording medium, so information recorded on the recording medium cannot be read accurately and sound skipping occurs. There is a problem that it may be. The conventional techniques described in Patent Documents 1 to 5 are not configured to adjust to an accurate servo gain according to each of vibration and scratches formed on the recording medium. There is a problem.

  An object of the present invention is to provide a disk device and a navigation device that can accurately read information recorded on a recording medium.

The present invention relates to storage means for storing vibration related information related to vibration and servo gain related information related to servo gain in association with each other;
Reading means for reading information recorded on the recording medium;
Vibration state detecting means for detecting a vibration state;
Servo gain related information associated with vibration related information corresponding to the vibration state detected by the vibration state detecting means is extracted from the storage means, and the reading operation of the reading means is performed based on the extracted servo gain related information. And a control means for controlling the disk device.

  According to the present invention, the storage means stores the vibration related information related to the vibration and the servo gain related information related to the servo gain in association with each other. The reading unit reads information recorded on the recording medium. The vibration state detection means detects a vibration state. The control means extracts servo gain related information associated with the vibration related information corresponding to the vibration state detected by the vibration state detecting means from the storage means, and reads the reading means based on the extracted servo gain related information. Control the behavior. Information read by the reading means, for example, image data is converted into an image, and the image is output to a display or the like. Information read by the reading means, for example, voice data is sonicated, and voice is output from a speaker or the like. Thus, the servo gain related information associated with the vibration related information corresponding to the vibration state detected by the vibration state detecting means is extracted from the storage means by the control means, and based on the extracted servo gain related information, The reading operation of the reading means is controlled. Therefore, the servo gain related information is dynamically changed according to the actually detected vibration state, and the information recorded on the recording medium can be read accurately. As a result, for example, the sound skipped when the recording medium is reproduced can be reduced as much as possible by the vibration or the sound skip that changes discontinuously due to scratches formed on the recording medium.

In addition, the present invention further includes an abnormality detection means for detecting that an abnormality has occurred in the information read by the reading means,
When the abnormality detecting means detects that an abnormality has occurred in the information read by the reading means, the control means associates with vibration related information corresponding to the vibration state detected by the vibration state detecting means. The extracted servo gain related information is extracted from the storage means, and the reading operation of the reading means is controlled based on the extracted servo gain related information.

  According to the present invention, the abnormality detection unit detects that an abnormality has occurred in the information read by the reading unit. When the abnormality detection unit detects that an abnormality has occurred in the information read by the reading unit, the control unit controls the servo gain associated with the vibration related information corresponding to the vibration state detected by the vibration state detection unit. The related information is extracted from the storage means, and the reading operation of the reading means is controlled based on the extracted servo gain related information. As described above, when the abnormality detecting unit detects that an abnormality has occurred in the information read by the reading unit, the control unit associates it with the vibration related information corresponding to the vibration state detected by the vibration state detecting unit. The extracted servo gain related information is extracted from the storage means, and the reading operation of the reading means is controlled based on the extracted servo gain related information. Therefore, the servo gain related information is dynamically changed according to the actually detected vibration state, and the information recorded on the recording medium can be read accurately. Thus, after the abnormality detecting unit detects that the information read by the reading unit is abnormal, for example, the sound output when the recording medium is reproduced is generated in the vibration or the recording medium. Sound skipping that changes discontinuously due to scratches can be minimized.

Further, the present invention provides a reading accuracy detection unit that detects a reading accuracy by the reading unit;
The servo gain related information stored in the storage means and the servo gain related information are changed so that the servo gain is changed, and the read accuracy detected by the read accuracy detecting means is the highest, and the read accuracy is the highest. It further includes information updating means capable of updating to vibration related information at the time.

  According to the present invention, the reading accuracy detecting means reads information recorded on the recording medium, for example, and counts the number of sound skipping occurring when the read information is reproduced, thereby reading by the reading means. Detect accuracy. The information updating means changes the servo gain of the vibration related information and the servo gain related information stored in the storage means, and the servo gain related information with the highest reading accuracy detected by the reading accuracy detecting means, and the reading accuracy It can be updated to vibration related information when becomes the highest. The control unit controls the reading operation of the reading unit based on the servo gain related information that provides the highest reading accuracy. As described above, since the reading operation of the reading unit is controlled based on the servo gain related information updated by the information updating unit so that the reading accuracy becomes the highest, the reading accuracy of the information recorded on the recording medium is improved. The information recorded on the recording medium can be read more accurately. As a result, for example, when a recording medium is reproduced, the sound output from a speaker or the like can be further reduced in the amount of sound skipping that changes discontinuously due to vibrations or scratches formed on the recording medium. .

In the present invention, the servo gain related information stored in the storage means includes at least one of a focus servo gain and a track servo gain,
The control means extracts at least one of a focus servo gain and a track servo gain associated with vibration related information corresponding to the vibration state detected by the vibration detection means from the storage means, and extracts the focus A reading operation of the reading unit is controlled based on at least one of a servo gain and a track servo gain.

  According to the present invention, the servo gain related information stored in the storage means includes at least one of a focus servo gain and a track servo gain. The control means extracts from the storage means at least one of a focus servo gain and a track servo gain associated with the vibration related information corresponding to the vibration state detected by the vibration detection means, and the extracted focus servo gain The reading operation of the reading unit is controlled based on at least one of the track servo gain and the track servo gain. For example, when the focus servo gain is extracted from the storage means by the control means, focus servo control is performed based on the extracted focus servo gain. Further, when the track servo gain is extracted from the storage means by the control means, the track servo control is performed based on the extracted track servo gain. As described above, the control unit extracts at least one of the focus servo gain and the track servo gain associated with the vibration related information corresponding to the vibration state detected by the vibration detection unit from the storage unit. The reading operation of the reading unit is controlled based on at least one of the focus servo gain and the track servo gain. Therefore, according to the actual vibration state, at least one of the focus servo gain and the track servo gain is dynamically changed, and the information recorded on the recording medium can be read accurately. As a result, for example, the sound skipped when the recording medium is reproduced can be reduced as much as possible by the vibration or the sound skip that changes discontinuously due to scratches formed on the recording medium.

Further, the present invention is a disk device provided in the moving body, further including speed detection means for detecting the moving speed of the moving body,
The vibration related information stored in the storage means is information on the moving speed of the moving body,
The control means extracts servo gain related information associated with the moving speed of the moving body detected by the speed detecting means from the storage means, and based on the extracted servo gain related information, the reading operation of the reading means It is characterized by controlling.

  According to the present invention, the storage means stores information on the moving speed of the moving body as vibration related information. The speed detecting means detects the moving speed of the moving body provided with the disk device. The control means extracts servo gain related information associated with the moving speed of the moving body detected by the speed calculating means from the storage means, and controls the reading operation of the reading means based on the extracted servo gain related information. . In this way, the servo means related information related to the moving speed of the moving body detected by the speed detecting means is extracted from the storage means by the control means, and based on the extracted servo gain related information, the reading means The reading operation is controlled. Therefore, the servo gain related information is dynamically changed according to the moving speed of the moving body related to the vibration, and the information recorded on the recording medium can be read accurately. As a result, for example, the sound skipped when the recording medium is reproduced can be reduced as much as possible by the vibration or the sound skip that changes discontinuously due to scratches formed on the recording medium.

Further, the present invention is a disk device provided in a moving body, further comprising sound collecting means for collecting acoustic noise generated around the moving body,
The vibration related information stored in the storage means is information of acoustic noise,
The control means extracts servo gain related information associated with the acoustic noise collected by the sound collecting means from the storage means, and controls the reading operation of the reading means based on the extracted servo gain related information. It is characterized by that.

  According to the present invention, the storage means stores the acoustic noise information as vibration related information. The sound collecting means collects acoustic noise generated around the moving body provided with the disk device. The control means extracts servo gain related information associated with the acoustic noise collected by the sound collecting means from the storage means, and controls the reading operation of the reading means based on the extracted servo gain related information. As described above, the servo means related information associated with the acoustic noise collected by the sound collecting means is extracted from the storage means by the control means, and the reading operation of the reading means is performed based on the extracted servo gain related information. Be controlled. Therefore, the servo gain related information is dynamically changed according to the acoustic noise related to the vibration, and the information recorded on the recording medium can be read accurately. As a result, for example, the sound skipped when the recording medium is reproduced can be reduced as much as possible by the vibration or the sound skip that changes discontinuously due to scratches formed on the recording medium.

The present invention is also a disk device provided in a moving body, further including road information acquisition means for acquiring road information relating to a road on which the moving body moves,
The vibration related information stored in the storage means is road information related to a road,
The control means extracts servo gain related information associated with the road information acquired by the road information acquisition means from the storage means, and controls the reading operation of the reading means based on the extracted servo gain related information. It is characterized by doing.

  According to the present invention, the storage means stores road information related to the road as vibration related information. The road information is information relating to the form and type of road, for example. The road information acquisition means acquires road information related to a road on which the moving body provided with the disk device moves. The control means extracts servo gain related information associated with the road information acquired by the road information acquisition means from the storage means, and controls the reading operation of the reading means based on the extracted servo gain related information. As described above, the servo gain related information associated with the road information acquired by the road information acquisition means is extracted from the storage means by the control means, and the reading operation of the reading means is performed based on the extracted servo gain related information. Is controlled. Therefore, servo gain related information is dynamically changed according to actual road information, for example, the form and type of the road, and the information recorded on the recording medium can be read accurately. As a result, for example, the sound skipped when the recording medium is reproduced can be reduced as much as possible by the vibration or the sound skip that changes discontinuously due to scratches formed on the recording medium.

The present invention further includes identification information acquisition means for acquiring recording medium identification information for identifying a recording medium from which recorded information is to be read.
The storage means further stores recording medium identification information, vibration related information and servo gain related information in association with each other for each of the plurality of recording media,
The control means extracts servo gain related information associated with the recording medium identification information acquired by the identification information acquisition means and vibration related information from the storage means, and based on the extracted servo gain related information, It controls the reading operation of the reading means.

  According to the present invention, the storage means stores recording medium identification information for identifying a plurality of recording media, vibration related information, and servo gain related information in association with each other for each of the plurality of recording media. The identification information acquisition means acquires recording medium identification information for identifying a recording medium from which recorded information is to be read. The control means extracts the servo gain related information associated with the recording medium identification information acquired by the identification information acquisition means and the vibration related information from the storage means, and based on the extracted servo gain related information, the reading means Control the reading operation. As described above, the control means extracts the servo gain related information associated with the recording medium identification information acquired by the identification information acquiring means and the vibration related information from the storage means, and based on the extracted servo gain related information. Thus, the reading operation of the reading means is controlled. Therefore, for each recording medium on which the recorded information is to be read, the servo gain related information is dynamically changed according to the vibration related information, and the information recorded on the recording medium is read accurately. Can do. As a result, for example, the sound skipped when the recording medium is reproduced can be reduced as much as possible by the vibration or the sound skip that changes discontinuously due to scratches formed on the recording medium.

According to the present invention, the storage means further stores the servo gain related information in association with reading position information relating to a predetermined reading position of the recording medium,
The control means extracts servo gain related information associated with reading position information from the storage means according to the reading position of the recording medium, and performs the reading operation of the reading means based on the extracted servo gain related information. It is characterized by controlling.

  According to the present invention, the storage means stores the servo gain related information and the reading position information related to the predetermined reading position of the recording medium in association with each other. The control means extracts servo gain related information associated with the reading position information from the storage means according to a predetermined reading position of the recording medium, and performs a reading operation of the reading means based on the extracted servo gain related information. Control. As described above, the control means extracts the servo gain related information associated with the read position information from the storage means according to the predetermined read position of the recording medium, and reads the read based on the extracted servo gain related information. The reading operation of the means is controlled. Therefore, the servo gain related information is dynamically changed according to the reading position of the recording medium, the reading accuracy of the information recorded on the recording medium can be further improved, and the information recorded on the recording medium is recorded. Can be read more accurately. As a result, for example, it is possible to reduce sound skipping that occurs when the sound output from the recording medium is discontinuously changed due to scratches formed on the recording medium.

The present invention further includes determination means for determining whether the road information acquired by the road information acquisition means is similar to the road information stored in the storage means,
When the determination unit determines that the road information acquired by the road information acquisition unit is similar to the road information stored in the storage unit, the control unit acquires the road information acquisition unit. Servo gain related information associated with road information similar to the road information is extracted from the storage means, and the reading operation of the reading means is controlled based on the extracted servo gain related information.

  According to the present invention, the determination unit determines whether or not the road information acquired by the road information acquisition unit is similar to the road information stored in the storage unit. When the determination means determines that the road information acquired by the road information acquisition means is similar to the road information stored in the storage means, the control means and the road information acquired by the road information acquisition means Servo gain related information associated with similar road information is extracted from the storage means, and the reading operation of the reading means is controlled based on the extracted servo gain related information. As described above, when the road information acquired by the road information acquisition unit is determined to be similar to the road information stored in the storage unit by the determination unit, the road information acquisition unit acquires the road information acquired by the control unit. Servo gain related information related to road information similar to the road information is extracted from the storage means, and the reading operation of the reading means is controlled based on the extracted servo gain related information. Therefore, servo gain related information is dynamically changed according to actual road information, for example, the form and type of the road, and the information recorded on the recording medium can be read accurately. As a result, for example, the sound skipped when the recording medium is reproduced can be reduced as much as possible in a discontinuous change due to vibration.

Further, the present invention is a disk device provided in the moving body, further including position information acquisition means for acquiring moving body position information indicating the position of the moving body,
The storage means further stores the moving body position information and the servo gain related information in association with each other,
The control means extracts servo gain related information associated with the moving body position information acquired by the position information acquisition means from the storage means, and based on the extracted servo gain related information, the reading operation of the reading means It is characterized by controlling.

  According to the present invention, the storage unit stores the moving body position information indicating the position of the moving body and the servo gain related information in association with each other. The position information acquisition means acquires moving body position information representing the position of the moving body. The control means extracts servo gain related information associated with the moving body position information acquired by the position information acquisition means from the storage means, and controls the reading operation of the reading means based on the extracted servo gain related information. . Thus, the servo gain related information associated with the moving body position information acquired by the position information acquisition means is extracted from the storage means by the control means, and based on the extracted servo gain related information, the reading means The reading operation is controlled. Therefore, the servo gain related information is dynamically changed according to the position of the moving body, and the information recorded on the recording medium can be read accurately. As a result, for example, the sound skipped when the recording medium is reproduced can be reduced as much as possible in a discontinuous change due to vibration.

Further, the present invention is a disk device provided via a damper means for buffering an external impact, and further includes a characteristic information setting means for setting buffer characteristic information when the external shock is buffered by the damper means. Including
The storage means further stores buffer characteristic information, the vibration related information, and the servo gain related information in association with each other,
When the buffer characteristic information is set by the characteristic information setting unit, the control unit stores the buffer gain information set by the characteristic information setting unit and the servo gain related information associated with the vibration related information. The reading operation of the reading means is controlled based on the servo gain related information extracted from the means.

  According to the present invention, the storage means stores buffer characteristic information, vibration-related information, and servo gain-related information when buffering an external impact in association with each other. The damper means buffers an external impact. Buffer characteristic information is set in the characteristic information setting means. When the buffer characteristic information is set by the characteristic information setting unit, the control unit extracts from the storage unit the buffer gain information set by the characteristic information setting unit and the servo gain related information associated with the vibration related information, Based on the extracted servo gain related information, the reading operation of the reading means is controlled. Thus, when the buffer characteristic information is set by the characteristic information setting means, the servo gain related information associated with the buffer characteristic information set by the characteristic information setting means and the vibration related information is stored by the control means. The reading operation of the reading unit is controlled based on the extracted servo gain related information. Therefore, for each buffer characteristic information set by the characteristic information setting means, the servo gain related information is dynamically changed according to the vibration related information, and the information recorded on the recording medium is read accurately. Can do. As a result, for example, the sound skipped when the recording medium is reproduced can be reduced as much as possible by the vibration or the sound skip that changes discontinuously due to scratches formed on the recording medium.

Further, the present invention is a navigation device that is provided in a moving body, incorporates a disk device, and performs route guidance,
Road information acquisition means for acquiring road information about the road on which the moving body moves;
Storage means for storing road information related to a road and servo gain related information related to servo gain in association with each other;
Reading means for reading information recorded on the recording medium;
Servo gain related information associated with the road information acquired by the road information acquiring means is extracted from the storage means, and control means for controlling the reading operation of the reading means based on the extracted servo gain related information; It is a navigation apparatus characterized by including.

  According to the present invention, the road information acquisition means acquires road information related to the road on which the moving body moves. The road information is information relating to the form and type of road, for example. The storage means stores road information and servo gain related information related to the servo gain in association with each other. The reading unit reads information recorded on the recording medium. The control means extracts servo gain related information associated with the road information acquired by the road information acquisition means from the storage means, and controls the reading operation of the reading means based on the extracted servo gain related information. As described above, the servo gain related information associated with the road information acquired by the road information acquisition means is extracted from the storage means by the control means, and the reading operation of the reading means is performed based on the extracted servo gain related information. Is controlled. Therefore, servo gain related information is dynamically changed according to actual road information, for example, the form and type of the road, and the information recorded on the recording medium can be read accurately. As a result, for example, the sound skipped when the recording medium is reproduced can be reduced as much as possible by the vibration or the sound skip that changes discontinuously due to scratches formed on the recording medium.

Further, the present invention is a disk device provided via a damper means for buffering an external impact,
Characteristic information setting means for setting buffer characteristic information when buffering impact from outside by the damper means;
Storage means for associating and storing the buffer characteristic information, vibration related information related to vibration, and servo gain related information related to servo gain;
Reading means for reading information recorded on the recording medium;
When the buffer characteristic information is set by the characteristic information setting unit, the servo gain related information associated with the buffer characteristic information and the vibration related information is extracted from the storage unit, and based on the extracted servo gain related information, And a control unit that controls a reading operation of the reading unit.

  According to the present invention, the damper means buffers an external impact. The storage means stores buffer characteristic information when the shock from the outside is buffered by the damper means, vibration related information related to vibration, and servo gain related information related to servo gain in association with each other. Buffer characteristic information is set in the characteristic information setting means. The reading unit reads information recorded on the recording medium. When the buffer characteristic information is set by the characteristic information setting unit, the control unit extracts from the storage unit the buffer gain information set by the characteristic information setting unit and the servo gain related information associated with the vibration related information, Based on the extracted servo gain related information, the reading operation of the reading means is controlled. Thus, when the buffer characteristic information is set by the characteristic information setting means, the servo gain related information associated with the buffer characteristic information set by the characteristic information setting means and the vibration related information is stored by the control means. The reading operation of the reading unit is controlled based on the extracted servo gain related information. Therefore, for each buffer characteristic information set by the characteristic information setting means, the servo gain related information is dynamically changed according to the vibration related information, and the information recorded on the recording medium is read accurately. Can do. As a result, for example, the sound skipped when the recording medium is reproduced can be reduced as much as possible by the vibration or the sound skip that changes discontinuously due to scratches formed on the recording medium.

  According to the present invention, the servo gain related information associated with the vibration related information corresponding to the vibration state detected by the vibration state detecting means is extracted from the storage means by the control means, and based on the extracted servo gain related information. Thus, the reading operation of the reading means is controlled. Therefore, the servo gain related information is dynamically changed according to the actually detected vibration state, and the information recorded on the recording medium can be read accurately. As a result, for example, the sound skipped when the recording medium is reproduced can be reduced as much as possible by the vibration or the sound skip that changes discontinuously due to scratches formed on the recording medium.

  According to the present invention, when the abnormality detection unit detects that an abnormality has occurred in the information read by the reading unit, the control unit detects vibration related to the vibration state detected by the vibration state detection unit. Servo gain related information associated with the information is extracted from the storage means, and the reading operation of the reading means is controlled based on the extracted servo gain related information. Therefore, the servo gain related information is dynamically changed according to the actually detected vibration state, and the information recorded on the recording medium can be read accurately. Thus, after the abnormality detecting unit detects that the information read by the reading unit is abnormal, for example, the sound output when the recording medium is reproduced is generated in the vibration or the recording medium. Sound skipping that changes discontinuously due to scratches can be minimized.

  Further, according to the present invention, since the reading operation of the reading unit is controlled based on the servo gain related information updated by the information updating unit so that the reading accuracy is highest, the reading accuracy of the information recorded on the recording medium is controlled. And the information recorded on the recording medium can be read more accurately. As a result, for example, when a recording medium is reproduced, the sound output from a speaker or the like can be further reduced in the amount of sound skipping that changes discontinuously due to vibrations or scratches formed on the recording medium. .

  According to the invention, the control unit extracts at least one of the focus servo gain and the track servo gain associated with the vibration related information corresponding to the vibration state detected by the vibration detection unit from the storage unit. The reading operation of the reading means is controlled based on at least one of the extracted focus servo gain and track servo gain. Therefore, according to the actual vibration state, at least one of the focus servo gain and the track servo gain is dynamically changed, and the information recorded on the recording medium can be read accurately. As a result, for example, the sound skipped when the recording medium is reproduced can be reduced as much as possible by the vibration or the sound skip that changes discontinuously due to scratches formed on the recording medium.

  According to the present invention, the control means extracts servo gain related information associated with the moving speed of the moving body detected by the speed detecting means from the storage means, and based on the extracted servo gain related information, The reading operation of the reading means is controlled. Therefore, the servo gain related information is dynamically changed according to the moving speed of the moving body related to the vibration, and the information recorded on the recording medium can be read accurately. As a result, for example, the sound skipped when the recording medium is reproduced can be reduced as much as possible by the vibration or the sound skip that changes discontinuously due to scratches formed on the recording medium.

  According to the invention, the control means extracts servo gain related information associated with the acoustic noise collected by the sound collecting means from the storage means, and based on the extracted servo gain related information, the reading means The reading operation is controlled. Therefore, the servo gain related information is dynamically changed according to the acoustic noise related to the vibration, and the information recorded on the recording medium can be read accurately. As a result, for example, the sound skipped when the recording medium is reproduced can be reduced as much as possible by the vibration or the sound skip that changes discontinuously due to scratches formed on the recording medium.

  According to the invention, the control means extracts servo gain related information associated with the road information acquired by the road information acquiring means from the storage means, and based on the extracted servo gain related information, the reading means The reading operation is controlled. Therefore, servo gain related information is dynamically changed according to actual road information, for example, the form and type of the road, and the information recorded on the recording medium can be read accurately. As a result, for example, the sound skipped when the recording medium is reproduced can be reduced as much as possible by the vibration or the sound skip that changes discontinuously due to scratches formed on the recording medium.

  According to the present invention, the servo gain related information related to the recording medium identification information acquired by the identification information acquiring means and the vibration related information is extracted from the storage means by the control means, and the extracted servo gain related information is extracted. Based on the information, the reading operation of the reading means is controlled. Therefore, for each recording medium on which the recorded information is to be read, the servo gain related information is dynamically changed according to the vibration related information, and the information recorded on the recording medium is read accurately. Can do. As a result, for example, the sound skipped when the recording medium is reproduced can be reduced as much as possible by the vibration or the sound skip that changes discontinuously due to scratches formed on the recording medium.

  According to the invention, the control means extracts servo gain related information associated with the read position information from the storage means according to a predetermined read position of the recording medium, and based on the extracted servo gain related information. Thus, the reading operation of the reading means is controlled. Therefore, the servo gain related information is dynamically changed according to the reading position of the recording medium, the reading accuracy of the information recorded on the recording medium can be further improved, and the information recorded on the recording medium is recorded. Can be read more accurately. As a result, for example, it is possible to reduce sound skipping that occurs when the sound output from the recording medium is discontinuously changed due to scratches formed on the recording medium.

  Further, according to the present invention, when it is determined that the road information acquired by the road information acquisition means is similar to the road information stored in the storage means by the determination means, the road information acquisition means is determined by the control means. Servo gain related information associated with road information similar to the road information acquired by the above is extracted from the storage means, and the reading operation of the reading means is controlled based on the extracted servo gain related information. Therefore, servo gain related information is dynamically changed according to actual road information, for example, the form and type of the road, and the information recorded on the recording medium can be read accurately. As a result, for example, the sound skipped when the recording medium is reproduced can be reduced as much as possible in a discontinuous change due to vibration.

  Further, according to the present invention, the servo gain related information associated with the moving body position information acquired by the position information acquiring means is extracted from the storage means by the control means, and based on the extracted servo gain related information. The reading operation of the reading means is controlled. Therefore, the servo gain related information is dynamically changed according to the position of the moving body, and the information recorded on the recording medium can be read accurately. As a result, for example, the sound skipped when the recording medium is reproduced can be reduced as much as possible in a discontinuous change due to vibration.

  Further, according to the present invention, when the buffer characteristic information is set by the characteristic information setting unit, the servo gain related information associated with the buffer characteristic information set by the characteristic information setting unit and the vibration related information by the control unit. Are extracted from the storage means, and the reading operation of the reading means is controlled based on the extracted servo gain related information. Therefore, for each buffer characteristic information set by the characteristic information setting means, the servo gain related information is dynamically changed according to the vibration related information, and the information recorded on the recording medium is read accurately. Can do. As a result, for example, the sound skipped when the recording medium is reproduced can be reduced as much as possible by the vibration or the sound skip that changes discontinuously due to scratches formed on the recording medium.

FIG. 1 is a block diagram showing a configuration of a navigation device 1 according to an embodiment of the present invention. The navigation device 1 includes an optical disc device 30 and a position detection unit 13. The navigation device 1 performs route guidance by displaying the vehicle position and map based on map information such as a road map. The optical disk device 30 reads information on a recording medium 20 such as a CD (Compact Disk) and a DVD (Digital Versatile Disk), or records information on the recording medium 20. In the present embodiment, it is assumed that the navigation device 1 or the optical disc device 30 is used by being mounted on a moving body, for example, a vehicle. The optical disk device 30 includes an optical pickup 2, an RF (Radio Frequency) amplifier 3, a DSP (Digital
Signal processor 4, motor driver 5, spindle motor 6, CPU (Central
Processing Unit) 7, storage unit 8, display unit 9, key input unit 10, voice input / output unit 11, speed detection unit 12, and damper 14.

  The optical pickup 2 is reflected by irradiating the recording medium 20 with a light source that emits a light beam of a predetermined wavelength band, an objective lens that guides the light beam emitted from the light source to the recording medium 20, and a light beam emitted from the light source. A light receiving element that receives the reflected light, a focus servo control that keeps the distance between the objective lens and the recording medium constant, and focuses the light beam on the information recording surface of the recording medium 20, and the light beam of the recording medium 20 It includes an objective lens driving actuator that drives the objective lens when performing track servo control for accurately following the track. The optical pickup 2 irradiates the information recording surface of the recording medium 20 with the light beam emitted from the light source via the objective lens, and receives the reflected light by the light receiving element. Then, a focus error signal (hereinafter sometimes simply referred to as “FE signal”), a track error signal (hereinafter sometimes simply referred to as “TE signal”), and a reproduction signal (which may be simply referred to as “TE signal”) from the light received by the light receiving element. Hereinafter, the encoded information recorded in the information recording surface of the recording medium 20 is read based on the generated RF signal. The optical pickup 2 gives the FE signal, TE signal, and RF signal generated by the light receiving element to the RF amplifier 3. The RF amplifier 3 amplifies the RF signal given from the optical pickup 2. The RF amplifier 3 gives the amplified RF signal to the DSP 4. Further, the RF amplifier 3 detects a vibration detection signal (hereinafter referred to as a vibration detection signal) when reading of information recorded on the recording medium 20 becomes unstable due to vibrations received from the outside or scratches formed on the recording medium 20. And a vibration detection terminal that outputs “VDET signal” in some cases. The RF amplifier 3 provides the DSP 4 with the VDET signal output from the vibration detection terminal.

  The DSP 4 is a RAM that stores predetermined signals supplied from the RF amplifier 3 such as VDET signal, FE signal, TE signal, and RF signal, and predetermined servo gains read from the storage unit 8 and supplied from the CPU 7 to be described later. It has a volatile memory such as (Random Access Memory). The DSP 4 gives the CPU 7 the VDET signal given from the RF amplifier 3. Further, the DSP 4 decodes the RF signal given from the RF amplifier 3 to generate reproduction data (hereinafter, sometimes simply referred to as “RF data”). The DSP 4 gives the generated RF data to the CPU 7. The DSP 4 performs analog / digital (abbreviation: A / D) conversion processing on the FE signal and the TE signal supplied from the RF amplifier 3 to convert the analog signal into a digital signal. The DSP 4 reads the A / D converted FE signal, the predetermined focus servo gain read from the CPU 7 described later, and calculated by the CPU 7 described later, and the focus servo gain supplied from the CPU 7. Based on this, a focus servo control signal (hereinafter simply referred to as “FSC signal”) for performing focus servo control is generated. The DSP 4 reads the TE signal that has been subjected to A / D conversion, a predetermined track servo gain that is read from the storage unit 8 and applied from the CPU 7 described later, and a track servo that is calculated by the CPU 7 described later and applied from the CPU 7. Based on the gain, a track servo control signal (hereinafter simply referred to as “TSC signal”) for performing track servo control is generated. The DSP 4 performs digital / analog (abbreviation: D / A) conversion processing on the generated FSC signal and TSC signal to convert the digital signal into an analog signal. The DSP 4 gives the FSC signal and TSC signal subjected to D / A conversion to the motor driver unit 5.

  A motor driver (Motor Driver) unit 5 generates a predetermined drive voltage or drive current for driving the spindle motor 6 and the objective lens drive actuator of the optical pickup 2 based on the FSC signal and the TSC signal given from the DSP 4. Supplied to the spindle motor 6 and the objective lens driving actuator. The spindle motor 6 rotates the recording medium 20 based on a predetermined driving voltage or driving current supplied from the motor driver unit 5. The objective lens drive actuator moves the objective lens in a focus direction substantially parallel to the optical axis of the objective lens and a track direction perpendicular to the focus direction based on a predetermined drive voltage or drive current supplied from the motor driver unit 5. Drive independently.

  The CPU 7 is based on a control program stored in the storage unit 8 to be described later, the DSP 4 constituting the navigation device 1, the storage unit 8, the display unit 9, the key input unit 10, the voice input / output unit 11, the speed detection unit 12, and The hardware resources including the position detection unit 13 are controlled. CPU7 memorize | stores the RF data given from DSP4 in the memory | storage part 8, and gives it to the display part 9 or the audio | voice input / output part 11 mentioned later. Further, the CPU 7 reads a predetermined servo gain stored in the storage unit 8 and gives the read servo gain to the DSP 4. Further, the CPU 7 reads a predetermined servo gain stored in the storage unit 8, adds a plurality of different predetermined servo gains to the read servo gain, and calculates a plurality of servo gains. Then, the calculated plurality of servo gains are given to the DSP 4. Here, the servo gain is at least one of a focus servo gain and a track servo gain. Further, the CPU 7 determines, based on the VDET signal given from the DSP 4, the number of times that the reading of information recorded on the recording medium 20 becomes unstable within a predetermined time, for example, one minute, specifically sound skipping. Count the number of occurrences.

  The display unit 9 is realized by, for example, a liquid crystal display (abbreviation: LCD) capable of color display, and displays predetermined characters and images based on RF data given from the CPU 7. On the display unit 9, for example, predetermined characters such as a song name and a player name accompanying the music information recorded on the recording medium 20, a road map, a vehicle position, route guidance for driving assistance, and sightseeing guidance are displayed. An image to represent is displayed. The key input unit 10 has a plurality of operation input keys for inputting predetermined information such as numeric information, character information, and a command to the navigation device 1, and operates the operation input keys to the CPU 7. Command corresponding to each operation input key. The key input unit 10 is provided separately from the optical disc device 30 and can be remotely operated to transmit a predetermined command to the navigation device 1 by infrared communication or the like, and has a plurality of operation input keys. A so-called remote control may be used. The voice input / output unit 11 includes a microphone and a speaker. The microphone collects acoustic noise in a predetermined frequency band generated around the vehicle, specifically road noise generated as the vehicle travels. The collected road noise frequency characteristic data is given to the CPU 7. The CPU 7 stores the sound pressure level for a predetermined frequency in the storage unit 8 based on the road noise frequency characteristic data provided from the voice input / output unit 11.

  The speed detection unit 12 detects a vehicle speed pulse signal generated corresponding to the rotational speed of a wheel when traveling on a road by a car, for example. The speed detector 12 gives the detected vehicle speed pulse signal to the CPU 7. The CPU 7 calculates the traveling speed of the vehicle based on the vehicle speed pulse signal given from the speed detector 12. The traveling speed of the vehicle is proportional to the rotational speed of the wheels. The damper 14 dampens vibrations caused by external impacts. The damper 14 is formed by an elastic member having elasticity, for example. The elastic member is constituted by, for example, a spring member, a rubber member, or a rubber member containing silicon. By changing the force of pressing against the elastic member from the outside, the hardness of the damper 14 changes. Servo gains such as a focus servo gain and a track servo gain also change according to the hardness of the damper 14. Therefore, in the present embodiment, by operating a predetermined operation input key of the key input unit 10, The buffer characteristic information indicating the height can be set, the servo gain is changed according to the set buffer characteristic information, and the information recorded on the recording medium 20 is read.

The position detection unit 13 includes an orientation sensor, a distance sensor, and a GPS (Global Positioning
System). The direction sensor absolutely detects the direction of the vehicle with reference to geomagnetism. As the azimuth sensor, a sensor composed of a azimuth magnet using the earth's magnetic field can be used. The distance sensor detects the travel distance of the vehicle. As the distance sensor, a sensor that combines a magnet that rotates together with the axle and a magnetic sensor that is configured by a reed switch that switches a connection state according to a change in a magnetic field can be used. The direction of the vehicle detected by the direction sensor and the travel distance of the vehicle detected by the distance sensor are given to the CPU 7. The CPU 7 can display the vehicle travel locus as a vector on the basis of the vehicle direction and the vehicle travel distance given from the position detection unit 13, and the relative vehicle position based on the departure point can be displayed. It can be obtained by autonomous navigation. In addition, GPS can receive radio signals from a plurality of artificial satellites constituting the global positioning system, and can calculate the position of the vehicle by a preset calculation process. The vehicle position calculated by the GPS is absolutely obtained as coordinates indicated by the latitude and longitude of the earth surface.

The storage unit 8 includes a control program for controlling the DSP 4 of the navigation device 1, the storage unit 8, the display unit 9, the key input unit 10, the voice input / output unit 11, the speed detection unit 12 and the position detection unit 13, and a map Information is stored. Here, the map information includes link information regarding lines, node information regarding points, and city area information representing city areas. A road is represented by sequentially connecting one or a plurality of links, and the end points of the links become nodes. The link information includes, for example, a link length dimension and a road type such as a toll road, a highway, and a general road. The node information includes coordinate information of each node. The storage unit 8 stores servo gain related information related to a predetermined servo gain for each of the plurality of recording media 20. The storage unit 8 stores a table in which vibration related information related to vibration and servo gain related information related to servo gain are associated with each other. The vibration-related information includes, for example, a predetermined vehicle traveling speed, a sound pressure level of road noise for a plurality of predetermined frequencies, and road information. The road information is information regarding the form or type of road. Here, the form of the road is, for example, a straight line and a curved line, and the types of roads are, for example, paved roads and unpaved roads, and general roads and highways. The servo gain related information is at least one of the focus servo gain and the track servo gain, or at least one of the calculation formula for calculating the focus servo gain and the calculation formula for calculating the track servo gain. The storage unit 8 also stores recording medium identification information for identifying the recording medium 20 from which recorded information is to be read, such as TOC (Table Of
A table in which information called “Contents”, the vibration related information, and the servo gain related information are associated with each other is stored. The storage unit 8 stores a table in which the reading position information and the servo gain related information are associated with each other. The reading position information includes, for example, a predetermined reading time and a predetermined time. The storage unit 8 stores a table in which vehicle position information representing the vehicle position is associated with the servo gain related information. The vehicle position information is, for example, latitude and longitude. Further, the storage unit 8 stores a table in which buffer characteristic information when the external shock including vibration is buffered by the damper, the vibration related information, and the servo gain related information are associated with each other. When a servo gain that further increases the reading accuracy is generated, the predetermined servo gain stored in the storage unit 8 is updated and stored in the servo gain that further increases the reading accuracy.

  In the present embodiment, the storage means is configured by the storage unit 8. The reading means is constituted by the optical pickup 2. The vibration state detection means includes the CPU 7, the speed detection unit 12, and the position detection unit 13. The control means is constituted by the CPU 7 and the storage unit 8. The abnormality detection means is constituted by the CPU 7. The reading accuracy detection means is constituted by the CPU 7. The information update means is constituted by the CPU 7. The speed detection means is constituted by the CPU 7 and the speed detection unit 12. The sound collecting means is configured by the voice input / output unit 11. The road information acquisition means is constituted by the CPU 7 and the storage unit 8. The identification information acquisition means includes an optical pickup 2, an RF amplifier 3, a DSP 4, a motor driver 5, a spindle motor 6, a CPU 7, and a storage unit 8. The determination means is constituted by the CPU 7. The position information acquisition unit includes the CPU 7 and the position detection unit 13. The damper means is constituted by a damper 14. The characteristic information setting means is constituted by the CPU 7 and the key input unit 10.

  FIG. 2 is a flowchart illustrating an example of a processing procedure of the CPU 7 regarding reading of information recorded on the recording medium 20. The processing procedure of the CPU 7 regarding the reading of information recorded on the recording medium 20 is executed when an operation for inputting a command for reproducing the recording medium 20 is performed by the user. Further, when the vehicle speed is represented by V, the storage unit 8 associates the vehicle speed V with V = 0 km / h, 0 km / h <V <30 km / h, and V ≦ 30 km / h, and the servo gain. Suppose that the table is stored. In step a1, a predetermined servo gain stored in advance is read from the storage unit 8, and the read servo gain is given to the DSP 4. In step a2, it is determined whether or not the VDET signal is given from the DSP 4. If the VDET signal is given, the process proceeds to step a3. If not, the process waits until the VDET signal is given from the DSP 4. In step a3, it is determined whether or not the vehicle traveling speed V calculated based on the vehicle speed pulse signal given from the speed detector 12 is V = 0 km / h, and if the traveling speed V is V = 0 km / h. If not, the process proceeds to step a4. Otherwise, the process proceeds to step a5. In step a4, the servo gain associated with the vehicle speed V of 0 km / h is read from the storage unit 8, and the read servo gain is given to the DSP 4. After performing the process of step a4, the process returns to step a2 and the same process as described above is performed. In step a5, it is determined whether or not the vehicle traveling speed V calculated based on the vehicle speed pulse signal given from the speed detector 12 is in the range of 0 km / h <V <30 km / h. If it belongs to the aforementioned range, the process proceeds to step a6, and if not, the process proceeds to step a7. In step a6, the servo gain associated with the vehicle speed V belonging to the range of 0 km / h <V <30 km / h is read from the storage unit 8, and the read servo gain is given to the DSP 4. After performing the process of step a6, the process returns to step a2 and the same process as described above is performed. In step a7, the servo gain associated with the vehicle speed of V ≦ 30 km / h is read from the storage unit 8, and the read servo gain is given to the DSP 4. After performing the process of step a7, the process returns to step a2, and the same process as described above is performed. As described above, the storage unit 8 stores a table in which the vehicle speed V of V = 0 km / h, 0 km / h <V <30 km / h, and V ≦ 30 km / h and the servo gain are associated with each other. However, the vehicle speed V is not limited to the numerical value described above, and may be set as appropriate according to the characteristics of the vehicle. Further, by finely setting the classification of the vehicle speed V, information recorded on the recording medium 20 can be read based on a more preferable servo gain, and reading accuracy can be improved.

  FIG. 3 is a flowchart illustrating an example of a processing procedure of the DSP 4 regarding reading of information recorded on the recording medium 20. The processing procedure of the DSP 4 regarding the reading of information recorded on the recording medium 20 is executed when the DSP 4 gives a predetermined servo gain read from the storage unit 8 by the CPU 7 from the CPU 7. In step b1, a predetermined servo gain read from the storage unit 8 by the CPU 7 and given from the CPU 7 is stored in the RAM. In step b2, a servo control signal for performing predetermined servo control is generated based on the servo gain stored in the RAM. In step b3, the servo control signal generated in step b2 is subjected to D / A conversion processing, and the servo control signal subjected to this D / A conversion processing is supplied to the motor driver unit 5. In step b4, it is determined whether or not the VDET signal is given from the RF amplifier 3. If the VDET signal is given, the process proceeds to step b5. If not, the RF amplifier 3 gives the VDET signal. stand by. In step b5, the VDET signal given from the RF amplifier 3 is given to the CPU 7. After performing the process of step b5, it returns to step b1 and performs the same process as described above. The reading operation of the information recorded on the recording medium 20 is performed according to the processing procedure of the CPU 7 according to the flowchart shown in FIG. 2 and the processing procedure of the DSP 4 according to the flowchart shown in FIG. The operation is repeated until a command input operation for ending reproduction of the recording medium 20 is performed.

  As described above, according to the present embodiment, the traveling speed of the vehicle and the servo gain are stored in the storage unit 8 in association with each other. The CPU 7 calculates the travel speed of the vehicle based on the vehicle speed pulse signal detected by the speed detection unit 12, reads out the servo gain associated with the calculated travel speed of the vehicle from the storage unit 8, and reads the servo gain thus read out. Is given to DSP4. The DSP 4 generates a servo control signal for performing servo control such as focus servo control and track servo control based on the servo gain supplied from the CPU 7, and provides the generated servo control signal to the servo driver unit 5. The servo driver unit 5 performs servo control by supplying a predetermined drive voltage or drive current to the optical pickup 2 based on a servo control signal given from the DSP. Thus, the optical pickup 2 reads information recorded on the recording medium 20. When image data is read by the optical pickup 2, the read image data is converted into an image, and the image is displayed on the display unit 9. Further, when audio data is read by the optical pickup 2, the read audio data is converted into audio, and the audio is output from the speaker of the audio input / output unit 11. As described above, the servo gain associated with the traveling speed of the vehicle is read from the storage unit 8 by the CPU 7 and recorded on the recording medium 20 by the optical pickup 2 based on the read servo gain. Information is read. Therefore, the servo gain is dynamically changed according to the actually detected traveling speed of the vehicle, and the information recorded on the recording medium 20 can be read accurately. As a result, for example, when the recording medium 20 is reproduced, the sound output from the speaker of the sound input / output unit 11 has a sound skip that changes discontinuously due to vibrations or scratches formed on the recording medium 20. It can be reduced as much as possible.

  FIG. 4 is a flowchart illustrating an example of a processing procedure of the CPU 7 regarding reading of information recorded on the recording medium 20. The processing procedure of the CPU 7 regarding the reading of information recorded on the recording medium 20 is executed when an operation for inputting a command for reproducing the recording medium 20 is performed by the user. Further, when the vehicle speed is represented by V, the storage unit 8 associates the vehicle speeds of V = 0 km / h, 0 km / h <V <30 km / h, V ≦ 30 km / h, and servo gains. Assume that a table is stored. In step c1, a predetermined servo gain stored in advance is read from the storage unit 8, and the read servo gain is given to the DSP 4. In step c2, it is determined whether or not the VDET signal is given from the DSP 4. If the VDET signal is given, the process proceeds to step c3. If not, the process waits until the VDET signal is given from the DSP 4. In step c3, it is determined whether or not the vehicle traveling speed V calculated based on the vehicle speed pulse signal given from the speed detecting unit 12 is V = 0 km / h, and if the traveling speed V is V = 0 km / h. If not, the process proceeds to step c4. Otherwise, the process proceeds to step c6. In step c4, the servo gain associated with the vehicle speed V of 0 km / h is read from the storage unit 8, and the read servo gain is given to the DSP 4. In step c5, a first servo gain update process is performed to update the servo gain when the vehicle speed V is V = 0 km / h to a servo gain with relatively high reading accuracy of information recorded on the recording medium 20. After performing step c5, the process proceeds to step c11.

  In step c6, it is determined whether or not the vehicle traveling speed V calculated based on the vehicle speed pulse signal given from the speed detector 12 is in the range of 0 km / h <V <30 km / h. If it belongs to the above-mentioned range, it will progress to step c7, and if it does not belong, it will progress to step c9. In step c7, the servo gain associated with the vehicle speed V belonging to the range of 0 km / h <V <30 km / h is read from the storage unit 8, and the read servo gain is given to the DSP 4. In step c8, the second servo gain update is performed to update the servo gain when the vehicle speed V is 0 km / h <V <30 km / h to a servo gain with relatively high reading accuracy of information recorded on the recording medium 20. Process. After performing step c8, the process proceeds to step c11. In step c9, the servo gain associated with the vehicle speed belonging to V ≦ 30 km / h is read from the storage unit 8, and the read servo gain is given to the DSP 4. In step c10, a third servo gain update process is performed in which the servo gain when the vehicle speed V is V ≦ 30 km / h is updated to a servo gain with relatively high reading accuracy of information recorded on the recording medium 20. After performing step c10, the process proceeds to step c11. In step c11, the servo gain updated in any of step c5, step c8, and step c10 is given to DSP4. After performing the process of step c11, the process returns to step c2, and the same process as described above is performed. As described above, the storage unit 8 stores a table in which the vehicle speed V of V = 0 km / h, 0 km / h <V <30 km / h, and V ≦ 30 km / h and the servo gain are associated with each other. However, the vehicle speed V is not limited to the numerical value described above, and may be set as appropriate according to the characteristics of the vehicle. Further, by finely setting the classification of the vehicle speed V, information recorded on the recording medium 20 can be read based on a more preferable servo gain, and reading accuracy can be improved.

  FIG. 5 is a flowchart showing the processing procedure of the CPU 7 regarding the first to third servo gain update processing of FIG. The processing procedure of the CPU 7 related to the first to third servo gain update processes in FIG. 4 is as follows. The CPU 7 associates a predetermined vehicle speed V with a predetermined vehicle speed and a servo gain stored in the storage unit 8. This is executed when the read servo gain is read and the read servo gain is given to the DSP 4. In step d1, servo control is performed according to a servo control signal generated by the DSP 4 based on the servo gain given to the DSP 4, and given from the DSP 4 when the information recorded on the recording medium 20 is read. Based on the VDET signal, a predetermined time, for example, the number of times the sound skips in one minute is counted. In step d2, the number of sound skips counted in step d1 and the servo gain corresponding to the predetermined vehicle speed V stored in advance in the storage unit 8 are associated with each other and stored in the storage unit 8. In step d3, a first servo gain is generated by adding a predetermined numerical value to a servo gain corresponding to a predetermined vehicle speed V stored in advance in the storage unit 8, and the generated first servo gain is given to the DSP 4. In step d4, servo control is performed according to the servo control signal generated by the DSP 4 based on the first servo gain given to the DSP 4 in step d3, and the information recorded on the recording medium 20 is read. The number of sound skips occurring in a predetermined time, for example, 1 minute, is counted based on the VDET signal given from the DSP 4. In step d5, the number of sound skips counted in step d4 and the first servo gain are associated with each other and stored in the storage unit 8. In step d6, a second servo gain is generated by subtracting a predetermined numerical value from a servo gain corresponding to a predetermined vehicle speed V stored in advance in the storage unit 8, and the generated second servo gain is given to the DSP 4.

  In step d7, servo control is performed according to the servo control signal generated by the DSP 4 based on the second servo gain given to the DSP 4 in step d6, and the information recorded on the recording medium 20 is read. The number of sound skips occurring in a predetermined time, for example, 1 minute, is counted based on the VDET signal given from the DSP 4. In step d8, the number of sound skips counted in step d7 and the second servo gain are associated with each other and stored in the storage unit 8. In step d9, among the servo gains stored in the storage unit 8 in step d2, step d5 and step d8, the servo gain with the highest reading accuracy of the information recorded on the recording medium 20, in other words, the sound skipping. And the servo gain corresponding to the predetermined vehicle speed V stored in advance in the storage unit 8 is updated to the extracted servo gain with the smallest number of skips. End the procedure. The predetermined vehicle speed V in step d2, step d3, step d6, and step d9 is different depending on each servo gain update process. The predetermined vehicle speed V in the first servo gain update process is 0 km / h, and the predetermined vehicle speed V in the second servo gain update process is a vehicle speed that belongs to the range of 0 km / h <V <30 km / h. The predetermined vehicle speed V in the third servo gain update process is a vehicle speed that belongs to V ≦ 30 km / h. The reading operation of the information recorded on the recording medium 20 is performed according to the processing procedure of the CPU 7 according to the flowcharts shown in FIGS. 4 and 5 and the processing procedure of the DSP 4 according to the flowchart shown in FIG. This is repeated until the user performs an input operation of a command to end the reproduction of the recording medium 20.

  As described above, according to the present embodiment, the CPU 7 adds a predetermined numerical value to a servo gain corresponding to a predetermined vehicle speed stored in the storage unit 8 in advance, or subtracts a predetermined numerical value from the servo gain. To generate a plurality of new servo gains. Servo control is performed according to the servo control signal generated by the DSP 4 based on the plurality of servo gains generated in this way and the servo gain stored in advance in the storage unit 8, and recording is performed on the recording medium 20 by the optical pickup 2. When the read information is read, the CPU 7 counts the number of times the sound skips based on the VDET signal given from the DSP 4. The CPU 7 reads information recorded on the recording medium 20 by the optical pickup 2 based on each of the servo gain corresponding to a predetermined vehicle speed stored in advance in the storage unit 8 and the plurality of generated servo gains. When performed, the predetermined servo gain stored in the storage unit 8 is set to the servo gain that maximizes the reading accuracy of the information recorded on the recording medium 20, in other words, the counted number of skips is the largest. Update to a lower servo gain. As a result, the information recorded on the recording medium 20 is read by the optical pickup 2 based on the servo gain with the highest reading accuracy. In the present embodiment, updating the servo gain means storing the predetermined servo gain stored in the storage unit 8 in place of a new servo gain different from the stored predetermined servo gain, The predetermined servo gain stored in the storage unit 8 is stored in place of the same servo gain as the stored servo gain. As described above, when the recording operation of the recording medium 20 is performed by the optical pickup 2 based on each of the servo gain read from the storage unit 8 and the generated plurality of servo gains, the storage unit 8 is updated to the servo gain with the highest reading accuracy of the information recorded on the recording medium 20, in other words, the servo gain with the smallest number of skipped sounds. . The optical pickup 2 reads the information recorded on the recording medium 20 based on the servo gain with the highest reading accuracy, in other words, the servo gain with the smallest number of sound skips. Therefore, the reading accuracy of the information recorded on the recording medium 20 can be improved, and the information recorded on the recording medium 20 can be read more accurately. As a result, for example, when the recording medium 20 is reproduced, the sound output from the speaker or the like is further reduced from the sound skipping that changes discontinuously due to vibrations or scratches formed on the recording medium 20. be able to.

  FIG. 6 is a flowchart illustrating an example of a processing procedure of the CPU 7 regarding reading of information recorded on the recording medium 20. The processing procedure of the CPU 7 regarding the reading of information recorded on the recording medium 20 is executed when an operation for inputting a command for reproducing the recording medium 20 is performed by the user. The storage unit 8 also stores a road noise sound pressure level (hereinafter simply referred to as “road noise”) L for a plurality of frequencies measured in advance, for example, L = 0 decibel (dB), 0 dB <L It is assumed that a table in which <ndB (n is a positive integer), L ≦ n (n is a positive integer), and servo gain is stored is stored. In step g1, a predetermined servo gain stored in advance is read from the storage unit 8, and the read servo gain is given to the DSP 4. In step g2, it is determined whether or not the VDET signal is given from the DSP 4. If the VDET signal is given, the process proceeds to step g3. If not, the process waits until the VDET signal is given from the DSP 4. In step g3, it is determined whether or not the road noise L given from the voice input / output unit 11 is L = 0 dB. If the road noise L is L = 0 dB, the process proceeds to step g4. Otherwise, the process proceeds to step g5. move on. In step g4, the servo gain associated with the 0 dB road noise L is read from the storage unit 8, and the read servo gain is given to the DSP 4. After performing the process of step g4, it returns to step g2 and performs the same process as described above. In step g5, it is determined whether or not the road noise L given from the voice input / output unit 11 belongs to the range of 0 dB <L <ndB. If the road noise L belongs to the above range, the process proceeds to step g6. If not, the process proceeds to step g7. In step g6, the servo gain associated with the road noise L belonging to the range of 0 dB <L <ndB is read from the storage unit 8, and the read servo gain is given to the DSP 4. After performing the process of step g6, it returns to step g2 and performs the same process as described above. In step g7, the servo gain associated with the road noise of L ≦ nd dB is read from the storage unit 8, and the read servo gain is given to the DSP 4. After performing the process of step g7, the process returns to step g2, and the same process as described above is performed. The reading operation of the information recorded on the recording medium 20 is performed according to the processing procedure of the CPU 7 according to the flowchart shown in FIG. 6 and the processing procedure of the DSP 4 according to the flowchart shown in FIG. The operation is repeated until a command input operation for ending reproduction of the recording medium 20 is performed.

  As described above, according to the present embodiment, the storage unit 8 stores the acoustic noise, the road noise in the present embodiment, and the servo gain in association with each other. The CPU 7 reads the servo gain associated with the road noise collected and given by the microphone of the voice input / output unit 11 from the storage unit 8 and gives the read servo gain to the DSP 4. The DSP 4 generates a servo control signal for performing servo control such as focus servo control and track servo control based on the servo gain supplied from the CPU 7, and provides the generated servo control signal to the servo driver unit 5. The servo driver unit 5 performs predetermined servo control by supplying a predetermined drive voltage or drive current to the optical pickup 2 based on a servo control signal given from the DSP. Thus, the optical pickup 2 reads information recorded on the recording medium 20. When image data is read by the optical pickup 2, the read image data is converted into an image, and the image is displayed on the display unit 9. Further, when audio data is read by the optical pickup 2, the read audio data is converted into audio, and the audio is output from the speaker of the audio input / output unit 11. As described above, the servo gain associated with the road noise collected by the microphone of the audio input / output unit 11 is read from the storage unit 8 by the CPU 7, and the optical pickup 2 is based on the read servo gain. The information recorded on the recording medium 20 is read. Therefore, the servo gain is dynamically changed according to the road noise related to the vibration, and the information recorded on the recording medium 20 can be read accurately. As a result, for example, when the recording medium 20 is reproduced, the sound output from the speaker of the sound input / output unit 11 has a sound skip that changes discontinuously due to vibrations or scratches formed on the recording medium 20. It can be reduced as much as possible.

  FIG. 7 is a flowchart illustrating an example of a processing procedure of the CPU 7 regarding reading of information recorded on the recording medium 20. The processing procedure of the CPU 7 regarding the reading of information recorded on the recording medium 20 is executed when an operation for inputting a command for reproducing the recording medium 20 is performed by the user. The storage unit 8 also stores a road noise sound pressure level (hereinafter simply referred to as “road noise”) L for a plurality of frequencies measured in advance, for example, L = 0 decibel (dB), 0 dB <L It is assumed that a table in which <ndB (n is a positive integer), L ≦ n (n is a positive integer), and servo gain is stored is stored. In step h1, a predetermined servo gain stored in advance from the storage unit 8 is read, and the read servo gain is given to the DSP 4. In step h2, it is determined whether or not the VDET signal is given from the DSP 4. If the VDET signal is given, the process proceeds to step h3. If not, the process waits until the VDET signal is given from the DSP 4. In step h3, it is determined whether or not the road noise L given from the voice input / output unit 11 is L = 0 dB. If the road noise L is L = 0 dB, the process proceeds to step h4. Otherwise, the process proceeds to step h6. move on. In step h4, the servo gain associated with the road noise L of 0 dB is read from the storage unit 8, and the read servo gain is given to the DSP 4. In step h5, when the road noise L is L = 0 dB, a first servo gain update process for updating to a servo gain with relatively high reading accuracy of information recorded on the recording medium 20 is performed. After performing step h5, the process proceeds to step h11.

  In step h6, it is determined whether or not the road noise L given from the voice input / output unit 11 belongs to the range of 0 dB <L <ndB. If the road noise L belongs to the aforementioned range, the process proceeds to step h7. If not, the process proceeds to step h9. In step h7, the servo gain associated with the road noise L belonging to the range of 0 dB <L <ndB is read from the storage unit 8, and the read servo gain is given to the DSP 4. In step h8, when the road noise L is 0 dB <L <ndB, a second servo gain update process is performed to update the servo gain with a relatively high reading accuracy of information recorded on the recording medium 20. After performing step h8, the process proceeds to step h11. In step h9, the servo gain associated with the road noise of L ≦ nd dB is read from the storage unit 8, and the read servo gain is given to the DSP 4. In step h10, a third servo gain update process for updating the servo gain when the road noise L is L ≦ ndB to a servo gain with relatively high reading accuracy of information recorded on the recording medium 20 is performed. After performing step h10, the process proceeds to step h11. In step h11, the servo gain updated in any of step h5, step h8 and step h10 is given to DSP4. After performing the process of step h11, the process returns to step h2 and the same process as described above is performed.

  FIG. 8 is a flowchart showing the processing procedure of the CPU 7 regarding the first to third servo gain update processing of FIG. The processing procedure of the CPU 7 relating to the first to third servo gain update processes in FIG. 7 is a table in which the road noise L for a plurality of frequencies measured in advance by the CPU 7 and stored in the storage unit 8 is associated with the servo gain. Is executed when the servo gain associated with the predetermined road noise L is read out and the read servo gain is given to the DSP 4. In step k1, servo control is performed according to a servo control signal generated by the DSP 4 based on the servo gain given to the DSP 4, and given from the DSP 4 when information recorded on the recording medium 20 is read. Based on the VDET signal, a predetermined time, for example, the number of times the sound skips in one minute is counted. In step k2, the number of sound skips counted in step k1 and the servo gain corresponding to the predetermined road noise L stored in advance in the storage unit 8 are associated with each other and stored in the storage unit 8. In step k3, a first servo gain is generated by adding a predetermined numerical value to the servo gain corresponding to the predetermined road noise L stored in advance in the storage unit 8, and the generated first servo gain is given to the DSP 4. In step k4, servo control is performed according to the servo control signal generated by the DSP 4 based on the first servo gain given to the DSP 4 in step k3, and the information recorded on the recording medium 20 is read. The number of sound skips occurring in a predetermined time, for example, 1 minute, is counted based on the VDET signal given from the DSP 4. In step k5, the number of sound skips counted in step k4 and the first servo gain are associated with each other and stored in the storage unit 8. In step k6, a second servo gain is generated by subtracting a predetermined numerical value from a servo gain corresponding to a predetermined road noise L stored in advance in the storage unit 8, and the generated second servo gain is given to the DSP 4.

  In step k7, servo control is performed in accordance with the servo control signal generated by the DSP 4 based on the second servo gain given to the DSP 4 in step k6, and the information recorded on the recording medium 20 is read. The number of sound skips occurring in a predetermined time, for example, 1 minute, is counted based on the VDET signal given from the DSP 4. In step k8, the number of sound skips counted in step k7 and the second servo gain are associated with each other and stored in the storage unit 8. In step k9, among the servo gains stored in the storage unit 8 in step k2, step k5 and step k8, the servo gain with the smallest number of skips is extracted, and a predetermined load stored in the storage unit 8 in advance is extracted. The servo gain corresponding to the noise L is updated to the servo gain with the smallest number of extracted sound skips, and all processing procedures are terminated. The predetermined road noise L in step k2, step k3, step k6, and step k9 described above varies depending on each servo gain update process. The predetermined road noise L in the first servo gain update processing is 0 dB, the predetermined road noise L in the second servo gain update processing is road noise that belongs to the range of 0 dB ≦ L <nddB, The predetermined road noise L in the servo gain update process is a road noise belonging to L ≦ ndB. The reading operation of the information recorded on the recording medium 20 is performed according to the processing procedure of the CPU 7 according to the flowcharts shown in FIGS. 6 to 8 and the processing procedure of the DSP 4 according to the flowchart shown in FIG. This is repeated until the user performs an input operation of a command to end the reproduction of the recording medium 20.

  As described above, according to the present embodiment, the CPU 7 adds a predetermined numerical value to the servo gain corresponding to the predetermined road noise stored in the storage unit 8 in advance, or subtracts the predetermined numerical value from the servo gain. To generate a plurality of new servo gains. Servo control is performed according to the servo control signal generated by the DSP 4 based on the plurality of servo gains generated in this way and the servo gain stored in advance in the storage unit 8, and recording is performed on the recording medium 20 by the optical pickup 2. When the read information is read, the CPU 7 counts the number of times the sound skips based on the VDET signal given from the DSP 4. The CPU 7 records information recorded on the recording medium 20 by the optical pickup 2 based on each of the servo gain corresponding to road noise of a predetermined frequency stored in the storage unit 8 in advance and the plurality of generated servo gains. Is read, the predetermined servo gain stored in the storage unit 8 is the servo gain at which the reading accuracy of the information recorded on the recording medium 20 is the highest, in other words, the counted sound skipping Update to the lowest servo gain. As a result, the information recorded on the recording medium 20 is read by the optical pickup 2 based on the servo gain with the highest reading accuracy. As described above, when the recording operation of the recording medium 20 is performed by the optical pickup 2 based on each of the servo gain read from the storage unit 8 and the generated plurality of servo gains, the storage unit 8 is updated to the servo gain with the highest reading accuracy of the information recorded on the recording medium 20, in other words, the servo gain with the smallest number of skipped sounds. . The optical pickup 2 reads information recorded on the recording medium 20 based on the servo gain with the highest reading accuracy, in other words, the servo gain with the smallest number of skipped sounds. Therefore, the reading accuracy of the information recorded on the recording medium 20 can be improved, and the information recorded on the recording medium 20 can be read more accurately. As a result, for example, when the recording medium 20 is reproduced, the sound output from the speaker of the audio input / output unit 11 has a sound skip that changes discontinuously due to vibration or scratches formed on the recording medium. It can be further reduced.

  FIG. 9 is a flowchart illustrating an example of a processing procedure of the CPU 7 regarding reading of information recorded on the recording medium 20. The processing procedure of the CPU 7 regarding the reading of information recorded on the recording medium 20 is executed when an operation for inputting a command for reproducing the recording medium 20 is performed by the user. Further, the storage unit 8 stores a table in which road information, a straight line in the present embodiment, a curved line in an urban area, and a road form of a curved line other than an urban area are associated with a servo gain. In step p1, a predetermined servo gain stored in advance is read from the storage unit 8, and the read servo gain is given to the DSP 4. In step p2, it is determined whether or not the VDET signal is given from the DSP 4. If the VDET signal is given, the process proceeds to step p3. If not, the process waits until the VDET signal is given from the DSP 4. In step p3, it is determined whether the road form is a straight line, in other words, whether the road form is a straight line or a curve. If the road form is a straight line, the process proceeds to step p4, and the road form is not a straight line. In other words, if the road form is a curve, the process proceeds to step p5. Here, the CPU 7 determines whether or not the road form is a straight line based on the link length dimension of the link information included in the map information stored in the storage unit 8. Specifically, if the length dimension of the link is equal to or greater than a predetermined length dimension, it is determined that the link is a straight line; otherwise, it is determined that the link is a curve. In step p4, the servo gain associated with the straight road form is read from the storage unit 8, and the read servo gain is given to the DSP 4. After performing the process of step p4, the process returns to step p2, and the same process as described above is performed. In step p5, it is determined whether or not the road form is a curve in an urban area. If the road form is a curve in an urban area, the process proceeds to step p6. Otherwise, the process proceeds to step p7. Here, the CPU 7 determines whether or not the road form is a curve in an urban area based on link information, node information, and urban area information included in the map information stored in the storage unit 8. In step p6, the servo gain associated with the road shape of the curve in the urban area is read from the storage unit 8, and the read servo gain is given to the DSP 4. After performing the process of step p6, the process returns to step p2, and the same process as described above is performed. In step p7, the servo gain associated with the road form of the curve other than the urban area is read from the storage unit 8, and the read servo gain is given to the DSP 4. After performing the process of step p7, the process returns to step p2, and the same process as described above is performed.

  As described above, according to the present embodiment, the storage unit 8 stores road information related to the form and type of road and the servo gain in association with each other. The CPU 7 determines the road form and the like based on the map information stored in the storage unit 8, reads the servo gain associated with the determined road form from the storage unit 8, and sends the read servo gain to the DSP 4. give. The DSP 4 generates a servo control signal for performing servo control such as focus servo control and track servo control based on the servo gain supplied from the CPU 7, and provides the generated servo control signal to the servo driver unit 5. The servo driver unit 5 performs predetermined servo control by supplying a predetermined drive voltage or drive current to the optical pickup 2 based on a servo control signal given from the DSP. Thus, the optical pickup 2 reads information recorded on the recording medium 20. When image data is read by the optical pickup 2, the read image data is converted into an image, and the image is displayed on the display unit 9. Further, when audio data is read by the optical pickup 2, the read audio data is converted into audio, and the audio is output from the speaker of the audio input / output unit 11. As described above, the servo gain associated with the road information such as the form and type of the road related to the vibration is read from the storage unit 8 by the CPU 7, and the optical pickup 2 is based on the read servo gain. The information recorded on the recording medium 20 is read. Therefore, the servo gain is dynamically changed in accordance with road information such as the form and type of road related to vibration, and the information recorded on the recording medium 20 can be read accurately. As a result, for example, when the recording medium 20 is reproduced, the sound output from the speaker of the sound input / output unit 11 has a sound skip that changes discontinuously due to vibrations or scratches formed on the recording medium 20. It can be reduced as much as possible.

  In this embodiment, in step p4, step p6 and step p7, it is recorded on the recording medium 20 on the basis of the servo gains respectively associated with the straight road, the curved road in the urban area, and the road form of the curved road outside the urban area. However, in other embodiments of the present invention, based on servo gains associated with road types such as paved and unpaved roads, and general roads and highways. Even when the information recorded in the recording medium 20 is read, the same effect as in the present embodiment can be obtained.

  FIG. 10 is a flowchart illustrating an example of a processing procedure of the CPU 7 regarding reading of information recorded in the recording medium 20. The processing procedure of the CPU 7 regarding the reading of information recorded on the recording medium 20 is executed when an operation for inputting a command for reproducing the recording medium 20 is performed by the user. In addition, the storage unit 8 stores a table in which each of the road forms of a straight line, a curved line in an urban area, and a curved line other than an urban area is associated with a servo gain. In step q1, a predetermined servo gain stored in advance is read from the storage unit 8, and the read servo gain is given to the DSP 4. In step q2, it is determined whether or not the VDET signal is given from the DSP 4. If the VDET signal is given, the process proceeds to step q3. If not, the process waits until the VDET signal is given from the DSP 4. In step q3, it is determined whether the road form is a straight line, in other words, whether the road form is a straight line or a curve. If the road form is a straight line, the process proceeds to step q4, and the road form is not a straight line. In other words, if the road form is a curve, the process proceeds to step q5. Here, the CPU 7 determines whether or not the road form is a straight line based on the link length dimension of the link information included in the map information stored in the storage unit 8. Specifically, if the length dimension of the link is equal to or greater than a predetermined length dimension, it is determined that the link is a straight line; otherwise, it is determined that the link is a curve. In step q4, the servo gain associated with the straight road form is read from the storage unit 8, and the read servo gain is given to the DSP 4. In step q5, a first servo gain update process for updating the servo gain when the road form is a straight line to a servo gain with relatively high reading accuracy of information recorded on the recording medium 20 is performed. After performing the process of step q5, the process proceeds to step q11.

  In step q6, it is determined whether or not the road form is a curve in an urban area. If the road form is a curve in an urban area, the process proceeds to step q7, and if not, the process proceeds to step q9. Here, the CPU 7 determines whether or not the road form is a curve in an urban area based on link information, node information, and urban area information included in the map information stored in the storage unit 8. In step q7, the servo gain associated with the curved road form in the urban area is read from the storage unit 8, and the read servo gain is given to the DSP 4. In step q8, a second servo gain update process is performed to update the servo gain when the road form is a curve in an urban area to a servo gain with relatively high reading accuracy of information recorded on the recording medium 20. After performing step q8, the process proceeds to step q11. In step q9, the servo gain associated with the road form of the curve other than the urban area is read from the storage unit 8, and the read servo gain is given to the DSP 4. In step q10, a third servo gain update process is performed to update the servo gain when the road form is a curve other than the urban area to a servo gain with relatively high reading accuracy of information recorded on the recording medium 20. After performing the process of step q10, the process proceeds to step q11. In step q11, the servo gain updated in any of step q5, step q8 and step q10 is given to DSP4. After performing the process of step q11, the process returns to step q2 and the same process as described above is performed.

  FIG. 11 is a flowchart showing the processing procedure of the CPU 7 regarding the first to third servo gain update processing of FIG. The processing procedure of the CPU 7 relating to the first to third servo gain update processing in FIG. 10 is related to a predetermined road form from the table in which the CPU 7 stores the road information stored in the storage unit 8 and the servo gain. This is executed when the servo gain read is read and the read servo gain is given to the DSP 4. In step r1, servo control is performed according to the servo control signal generated by the DSP 4 based on the servo gain given to the DSP 4, and given from the DSP 4 when the information recorded on the recording medium 20 is read. Based on the VDET signal, a predetermined time, for example, the number of times the sound skips in one minute is counted. In step r2, the number of sound skips counted in step r1 and the servo gain corresponding to a predetermined road form stored in advance in the storage unit 8 are associated with each other and stored in the storage unit 8. In step r3, a first servo gain is generated by adding a predetermined numerical value to a servo gain corresponding to a predetermined road form stored in advance in the storage unit 8, and the generated first servo gain is given to the DSP 4. In step r4, servo control is performed in accordance with the servo control signal generated by the DSP 4 based on the first servo gain given to the DSP 4 in step r3, and the information recorded on the recording medium 20 is read. The number of sound skips occurring in a predetermined time, for example, 1 minute, is counted based on the VDET signal given from the DSP 4. In step r5, the number of sound skips counted in step r4 and the first servo gain are associated with each other and stored in the storage unit 8. In step r6, a second servo gain is generated by subtracting a predetermined numerical value from a servo gain corresponding to a predetermined road form stored in advance in the storage unit 8, and the generated second servo gain is given to the DSP 4.

  In step r7, servo control is performed in accordance with the servo control signal generated by the DSP 4 based on the second servo gain given to the DSP 4 in step r6, and the information recorded on the recording medium 20 is read. The number of sound skips occurring in a predetermined time, for example, 1 minute, is counted based on the VDET signal given from the DSP 4. In step r8, the number of sound skips counted in step r7 and the second servo gain are associated with each other and stored in the storage unit 8. In step r9, among the servo gains stored in the storage unit 8 in step r2, step r5 and step r8, the servo gain with the smallest number of sound skips is extracted, and a predetermined road stored in the storage unit 8 in advance. The servo gain corresponding to the form is updated to the servo gain with the smallest number of extracted sound skips, and all processing procedures are terminated. The reading operation of the information recorded on the recording medium 20 is performed, for example, according to the processing procedure of the CPU 7 according to the flowcharts shown in FIGS. 9 to 11 and the processing procedure of the DSP 4 according to the flowchart shown in FIG. This is repeated until the user performs an input operation of a command to end the reproduction of the recording medium 20.

  As described above, according to the present embodiment, the CPU 7 adds a predetermined numerical value to the servo gain corresponding to the road information such as the form and type of the predetermined road stored in the storage unit 8 in advance, A plurality of new servo gains are generated by subtracting a predetermined numerical value from the gain. When servo control is performed in accordance with a servo control signal generated by the DSP 4 based on the plurality of servo gains generated in this way, and information recorded on the recording medium 20 is read by the optical pickup 2 The CPU 7 counts the number of times the sound skips based on the VDET signal given from the DSP 4. The CPU 7 reads information recorded on the recording medium 20 by the optical pickup 2 based on each of the servo gain corresponding to predetermined road information stored in the storage unit 8 in advance and the plurality of generated servo gains. Is performed, the predetermined servo gain stored in the storage unit 8 is set to the servo gain with the highest reading accuracy of the information recorded in the recording medium 20, in other words, the counted number of skips. Update to the lowest servo gain. As a result, the information recorded on the recording medium 20 is read by the optical pickup 2 based on the servo gain with the highest reading accuracy. As described above, when the reading operation of the recording medium 20 is performed by the optical pick 2 based on each of the servo gain read from the storage unit 8 and the plurality of generated servo gains, the storage unit 8 is updated to the servo gain with the highest reading accuracy of the information recorded on the recording medium 20, in other words, the servo gain with the smallest number of skipped sounds. . The optical pickup 2 reads the information recorded on the recording medium 20 based on the servo gain with the highest reading accuracy, in other words, the servo gain with the smallest number of sound skips. Therefore, the reading accuracy of the information recorded on the recording medium 20 can be improved, and the information recorded on the recording medium 20 can be read more accurately. As a result, for example, when the recording medium 20 is played back, the sound output from the speaker of the audio input / output unit 11 is discontinuously changed due to vibrations or scratches formed on the recording medium. Can be further reduced.

  In the present embodiment, in step q4, step q7 and step q9, the recording medium 20 is recorded based on the servo gain associated with the straight road, the curved road in the urban area, and the road form of the curved road outside the urban area, respectively. Although configured to read recorded information, in other embodiments of the present invention, the servo gains associated with road types such as paved and unpaved roads, and general roads and highways are used. Based on this, even when the information recorded on the recording medium 20 is read, the same effect as the present embodiment can be obtained.

  FIG. 12 is a flowchart illustrating an example of a processing procedure of the CPU 7 regarding reading of information recorded on the recording medium 20. The processing procedure of the CPU 7 regarding the reading of information recorded on the recording medium 20 is executed when an operation for inputting a command for reproducing the recording medium 20 is performed by the user. Further, when the vehicle speed is represented by V, the storage unit 8 associates the vehicle speeds of V = 0 km / h, 0 km / h <V <30 km / h, V ≦ 30 km / h, and servo gains. Assume that a table is stored. In step u1, a command to read the recording medium identification information recorded in the recording medium 20, that is, the TOC information in this embodiment, is given to the DSP 4. The DSP 4 gives a predetermined control signal to the motor driver unit 5 based on the TOC information read command given from the CPU 7. The motor driver unit 5 supplies a predetermined drive voltage or drive current to the spindle motor 6 and the optical pickup 2 based on a predetermined control signal given from the DSP 4. Thereby, the optical pickup 2 reads the TOC information recorded on the recording medium 20. The TOC information read by the optical pickup 2 is given to the CPU 7 via the RF amplifier 3 and the DSP 4. In step u2, it is determined whether or not the TOC information read from the recording medium 20 is stored in the storage unit 8. If the TOC information is stored in the storage unit 8, the process proceeds to step u3. Proceed to step u5. In step u3, the vehicle speed is calculated based on the vehicle speed pulse signal given from the speed detector 12. In step u4, the servo gain associated with the TOC information read from the recording medium 20 and the vehicle speed calculated in step u3 is read from the storage unit 8, and the read servo gain is given to the DSP 4. After performing the process of step u4, the process proceeds to step u7. In step u5, the TOC information read from the recording medium 20 is stored in the storage unit 8. In step u6, a predetermined servo gain stored in advance is read from the storage unit 8, and the read servo gain is given to the DSP 4. After performing the process of step u6, the process proceeds to step u7.

  Since the processing from step u7 to step u15 is the same as the processing from step c2 to step c10 shown in the flowchart of FIG. 4, the description of the processing from step u7 to step u15 is omitted. After performing the processing of step u10, step u13, and step u15, the process proceeds to step u16. In step u16, the servo gain updated in any of step u10, step u13, and step u15, predetermined vibration related information, in this embodiment, the predetermined vehicle speed, and the TOC information are associated with each other and stored in storage unit 8. Let In step u17, the servo gain updated in any of step u10, step u13, and step u15 is given to DSP4. After performing the process of step u17, the process returns to step u7 and the same process as described above is performed. The reading operation of the information recorded on the recording medium 20 is performed according to the processing procedure of the CPU 7 according to the flowchart shown in FIG. 12 and the processing procedure of the DSP 4 according to the flowchart shown in FIG. The operation is repeated until a command input operation for ending reproduction of the recording medium 20 is performed. In the present embodiment, the processing of steps c2 to c10 shown in the flowchart of FIG. 4 is performed in steps u7 to u15. However, in other embodiments of the present invention, steps u7 to step u15 are performed. In u15, any one of the processes of steps h2 to h10 shown in the flowchart of FIG. 7 and the processes of steps q2 to q10 shown in the flowchart of FIG. 10 described above may be performed. In another embodiment of the present invention, when the processing of step h2 to step h10 shown in the flowchart of FIG. 7 is performed instead of the processing of step u7 to step u15, step u10 shown in the flowchart of FIG. The servo gain, the predetermined road noise, and the TOC information updated in any one of steps u13 and u15 are stored in the storage unit 8 in association with each other. In still another embodiment of the present invention, when the processing of step q2 to step q10 shown in the flowchart of FIG. 10 is performed instead of the processing of step u7 to step u15, in step u16 shown in the flowchart of FIG. The servo gain updated in any of step u10, step u13 and step u15, predetermined road information, and TOC information are associated with each other and stored in the storage unit 8.

As described above, according to the present embodiment, predetermined recording medium identification information, that is, TOC information in the present embodiment, is read from the recording medium 20. When the read TOC information is stored in the storage unit 8, the CPU 7 stores the read TOC information and the predetermined vibration related information from the storage unit 8, the servo gain associated with the vehicle speed in this embodiment. Read, and the read servo gain is given to the DSP 4. The DSP 4 generates a servo control signal for performing servo control such as focus servo control and track servo control based on the servo gain supplied from the CPU 7, and supplies the generated servo control signal to the servo driver unit 5. The servo driver unit 5 performs servo control by supplying a predetermined drive voltage or drive current to the optical pickup 2 based on the servo control signal given from the DSP. Thus, the optical pickup 2 reads information recorded on the recording medium 20. When image data is read by the optical pickup 2, the read image data is converted into an image, and the image is displayed on the display unit 9. Further, when audio data is read by the optical pickup 2, the read audio data is converted into audio, and the audio is output from the speaker of the audio input / output unit 11. As described above, the servo gain associated with the TOC information and the vehicle speed is read from the storage unit 8 by the CPU 7, and based on the read servo gain, a CD-R (Compact Disk-Recordable), CD- RW
(Compact Disk-Rewritable), DVD-R (Digital Versatile Disk-Recordable), DVD-RAM (Digital Versatile Disk-Random Access Memory), etc. The read information is read. Therefore, the servo gain is dynamically changed according to the vehicle speed for each recording medium 20 on which the recorded information is to be read, so that the information recorded on the recording medium 20 can be accurately read. it can. As a result, for example, when the recording medium 20 is reproduced, the sound output from the speaker of the sound input / output unit 11 is subjected to vibration or sound skipping that changes discontinuously due to scratches formed on the recording medium 20. It can be reduced as much as possible.

  FIG. 13 is a flowchart illustrating an example of a processing procedure of the CPU 7 regarding reading of information recorded on the recording medium 20. The processing procedure of the CPU 7 regarding the reading of information recorded on the recording medium 20 is executed when an operation for inputting a command for reproducing the recording medium 20 is performed by the user. The storage unit 8 also has a table in which reading position information including a predetermined reading time and a predetermined time and a servo gain are associated with each other, and V = 0 km / h, 0 km / h when the vehicle speed is represented by V. It is assumed that a table in which each vehicle speed of <V <30 km / h and V ≦ 30 km / h and a servo gain are associated with each other is stored. In step v1, a predetermined servo gain stored in advance is read from the storage unit 8, and the read servo gain is given to the DSP 4. In step v2, it is determined whether or not a predetermined reading time has come. If the reading time has come, the process proceeds to step v3, and if not, the process proceeds to step v4. Here, whether or not the predetermined reading time has come is determined by the CPU 7 based on time measurement information including the reproduction time of the recording medium 20 given from a real time clock (abbreviation: RTC) (not shown), for example. To do. In step v3, a servo gain associated with predetermined reading position information including a predetermined reading time and a predetermined time is read from the storage unit 8, and the read servo gain is given to the DSP 4. After performing the process of step v3, the CPU 7 determines whether or not a predetermined time has elapsed from a predetermined reading time, based on the reading position information read from the storage unit 8 and the timing information given from the RTC. When the predetermined time has elapsed, the same servo gain as that given to the DSP 4 immediately before the predetermined reading time arrives is given to the DSP 4, and the process proceeds to step v4. In step v4, it is determined whether or not the VDET signal is given from the DSP 4. If the VDET signal is given, the process proceeds to step v5. If not, the process returns to step v2 and the same processing as described above is performed. The processing of step v5 to step v9 is the same as the processing of step a3 to step a7 shown in the flowchart of FIG. After performing the processing of step v6, step v8, and step v9, the processing returns to step v4 and the same processing as described above is performed. The reading operation of the information recorded on the recording medium 20 is performed according to the processing procedure of the CPU 7 according to the flowchart shown in FIG. 13 and the processing procedure of the DSP 4 according to the flowchart shown in FIG. The operation is repeated until a command input operation for ending reproduction of the recording medium 20 is performed. In the present embodiment, in steps v5 to v9, the processing of step a3 to step a7 shown in the flowchart of FIG. 2 is performed. However, in other embodiments of the present invention, steps v5 to step v9 are performed. In v9, the process from step c3 to step c11 shown in the flowchart of FIG. 4, the process of step g3 to step g7 shown in the flowchart of FIG. 6, and the process of step h3 to step h11 shown in the flowchart of FIG. Any one of the processing of step p3 to step p7 shown in the flowchart of FIG. 9 and the processing of step q3 to step q11 shown in the flowchart of FIG. 10 described above may be performed.

  As described above, according to the present embodiment, the storage unit 8 has a servo gain, reading position information relating to a predetermined reading position of the recording medium 20, and a predetermined reading time and a predetermined time in the present embodiment. Associated and stored. The CPU 7 reads out the servo gain associated with the reading position information indicating the predetermined reading position of the recording medium 20 from the storage unit 8 according to the predetermined reading position of the recording medium 20, and sends the read servo gain to the DSP 4. give. The DSP 4 generates a servo control signal for performing servo control such as focus servo control and track servo control based on the servo gain supplied from the CPU 7, and provides the generated servo control signal to the servo driver unit 5. The servo driver unit 5 performs servo control by supplying a predetermined drive voltage or drive current to the optical pickup 2 based on a servo control signal given from the DSP. Thus, the optical pickup 2 reads information recorded on the recording medium 20. When image data is read by the optical pickup 2, the read image data is converted into an image, and the image is displayed on the display unit 9. Further, when audio data is read by the optical pickup 2, the read audio data is converted into audio, and the audio is output from the speaker of the audio input / output unit 11. As described above, the servo gain associated with the reading position information is read from the storage unit 8 by the CPU 7 in accordance with the predetermined reading position of the recording medium 20, and based on the read servo gain, the optical gain is read. Information recorded on the recording medium 20 is read by the pickup 2. Therefore, the servo gain is dynamically changed according to the reading position of the recording medium 20, and the reading accuracy of the information recorded on the recording medium 20 can be further improved and recorded on the recording medium 20. Information can be read more accurately. As a result, for example, when the recording medium 20 is reproduced, the sound output from the speaker of the audio input / output unit 11 is less likely to discontinuously change due to scratches formed on the recording medium 20. Can do.

  FIG. 14 is a flowchart illustrating an example of a processing procedure of the CPU 7 regarding reading of information recorded on the recording medium 20. The processing procedure of the CPU 7 regarding the reading of information recorded on the recording medium 20 is executed when an operation for inputting a command for reproducing the recording medium 20 is performed by the user. The storage unit 8 stores a table in which a straight road form and a servo gain are associated with each other, and a table in which a curvature radius of a curve belonging to a predetermined range and a servo gain are associated with each other. To do. In step w1, a predetermined servo gain stored in advance is read from the storage unit 8, and the read servo gain is given to the DSP 4. In step w2, it is determined whether or not the VDET signal is given from the DSP 4. When the VDET signal is given, the process proceeds to step w3. When the VDET signal is not given, the process waits until the VDET signal is given from the DSP 4. In step w3, it is determined whether or not the road form is a straight line, in other words, whether the road form is a straight line or a curve. If the road form is a straight line, the process proceeds to step w4, and the road form is not a straight line. In other words, if the road form is a curve, the process proceeds to step w6. Here, the CPU 7 determines whether or not the road form is a straight line based on the link length dimension of the link information included in the map information stored in the storage unit 8. Specifically, if the length dimension of the link is equal to or greater than a predetermined length dimension, it is determined that the link is a straight line; otherwise, it is determined that the link is a curve. Steps w4 and w5 are the same as steps q4 and q5 shown in the flowchart of FIG. In step w6, based on the map information stored in the storage unit 8, the radius of curvature of the road determined to have a curved road form is calculated. In step w7, the servo gain associated with the curvature radius calculated in step w6 is read from the storage unit 8, and the read servo gain is given to the DSP 4. Steps w8 and w9 are the same as steps q8 and q11 shown in the flowchart of FIG. After performing the process of step w9, it returns to step w2 and performs the same process as described above. The reading operation of the information recorded on the recording medium 20 is performed according to the processing procedure of the CPU 7 according to the flowchart shown in FIG. 14 and the processing procedure of the DSP 4 according to the flowchart shown in FIG. The operation is repeated until a command input operation for ending reproduction of the recording medium 20 is performed.

  As described above, according to the present embodiment, the CPU 7 calculates the curvature radius of the road determined to have a curved road form based on the map information stored in the storage unit 8, and the calculated curvature radius is The road form determined by the CPU 7 is similar to the road form stored in the storage unit 8 when it belongs to a predetermined range, specifically, a range of a predetermined radius of curvature stored in the storage unit 8 in advance. It is determined that At this time, the CPU 7 reads out the servo gain associated with the calculated curvature radius from the storage unit 8, and gives this read servo gain to the DSP 4. The DSP 4 generates a servo control signal for performing servo control such as focus servo control and track servo control based on the servo gain supplied from the CPU 7, and provides the generated servo control signal to the servo driver unit 5. The servo driver unit 5 performs servo control by supplying a predetermined drive voltage or drive current to the optical pickup 2 based on a servo control signal given from the DSP. Thus, the optical pickup 2 reads information recorded on the recording medium 20. When image data is read by the optical pickup 2, the read image data is converted into an image, and the image is displayed on the display unit 9. Further, when audio data is read by the optical pickup 2, the read audio data is converted into audio, and the audio is output from the speaker of the audio input / output unit 11. As described above, in the present embodiment, when the curvature radius of the road of the curve calculated by the CPU 7 belongs to the predetermined curvature radius range stored in the storage unit 8, the curvature radius calculated by the CPU 7 is used. Is read from the storage unit 8, and information recorded on the recording medium 20 is read by the optical pickup 2 based on the read servo gain. Therefore, the servo gain is dynamically changed according to the actual road information, in this embodiment, the curvature radius of the curve, and the information recorded on the recording medium 20 can be read accurately. Thereby, for example, when the recording medium 20 is reproduced, the sound output from the speaker of the sound input / output unit 11 can be reduced as much as possible as the sound skips discontinuously changing due to vibration.

  FIG. 15 is a flowchart illustrating an example of a processing procedure of the CPU 7 regarding reading of information recorded on the recording medium 20. The processing procedure of the CPU 7 regarding the reading of information recorded on the recording medium 20 is executed when an operation for inputting a command for reproducing the recording medium 20 is performed by the user. Further, the storage unit 8 stores a table in which the vehicle position information and the servo gain are associated with each other, and a table in which each of the road forms of the straight line, the curve in the urban area, and the curve in the area other than the urban area and the servo gain are associated with each other. Suppose that it is done. In step x1, a predetermined servo gain stored in advance is read from the storage unit 8, and the read servo gain is given to the DSP 4. In step x2, it is determined whether or not predetermined vehicle position information is stored in the storage unit 8. If the vehicle position information is stored in the storage unit 8, the process proceeds to step x3. If not stored, the process proceeds to step x5. move on. In step x3, it is determined whether or not the vehicle on which the navigation device 1 is mounted has reached the position represented by the predetermined vehicle position information. When the vehicle has reached the position represented by the vehicle position information, the process proceeds to step x4 and reaches. If not, go to step x5. Here, whether the vehicle on which the navigation device 1 is mounted has reached the position represented by the predetermined vehicle position information is determined by the CPU 7, for example, the direction of the vehicle given from the position detection unit 13, the travel distance of the vehicle, and the like. The vehicle position is calculated based on In step x4, the servo gain associated with the vehicle position information indicating the position reached by the vehicle is read from the storage unit 8, and the read servo gain is given to the DSP 4. In step x5, it is determined whether or not the VDET signal is given from the DSP 4. If the VDET signal is given, the process proceeds to step x6. If not, the process returns to step x2 and the same processing as described above is performed.

  The processing from step x6 to step x13 is the same as the processing from step q3 to step q10 shown in the flowchart of FIG. In step x14, the servo gain updated in any of step x8, step x11, and step x13 is associated with predetermined vehicle position information and stored in the storage unit 8. In step x15, the servo gain updated in any of step x8, step x11, and step x13 is given to DSP4. After performing the process of step x15, the process returns to step x2, and the same process as described above is performed. The reading operation of the information recorded on the recording medium 20 is performed according to, for example, the processing procedure of the CPU 7 according to the flowchart shown in FIG. 15 and the processing procedure of the DSP 4 according to the flowchart shown in FIG. The operation is repeated until a command input operation for ending reproduction of the recording medium 20 is performed.

  As described above, according to the present embodiment, the storage unit 8 stores vehicle position information indicating a predetermined vehicle position and a servo gain in association with each other. The CPU 7 calculates the vehicle position based on the vehicle direction and the travel distance of the vehicle given from the position detection unit 13. When the calculated own vehicle position coincides with the position of the vehicle represented by the vehicle position information stored in advance in the storage unit 8, in other words, the position of the vehicle on which the navigation device 1 is mounted is represented by the predetermined vehicle position information. The CPU 7 reads out the servo gain associated with the vehicle position information indicating the position where the vehicle has arrived from the storage unit 8 and gives the read servo gain to the DSP 4. The DSP 4 generates a servo control signal for performing servo control such as focus servo control and track servo control based on the servo gain supplied from the CPU 7, and provides the generated servo control signal to the servo driver unit 5. The servo driver unit 5 performs servo control by supplying a predetermined drive voltage or drive current to the optical pickup 2 based on a servo control signal given from the DSP. Thus, the optical pickup 2 reads information recorded on the recording medium 20. When image data is read by the optical pickup 2, the read image data is converted into an image, and the image is displayed on the display unit 9. Further, when audio data is read by the optical pickup 2, the read audio data is converted into audio, and the audio is output from the speaker of the audio input / output unit 11. As described above, the servo gain associated with the vehicle position information indicating the calculated vehicle position is read from the storage unit 8 by the CPU 7, and the recording medium by the optical pickup 2 is read based on the read servo gain. The information recorded in 20 is read. Therefore, the servo gain is dynamically changed according to the position of the vehicle, and the information recorded on the recording medium 20 can be read accurately. Thereby, for example, when the recording medium 20 is reproduced, the sound output from the speaker of the sound input / output unit 11 can be reduced as much as possible as the sound skips discontinuously changing due to vibration.

  FIG. 16 is a flowchart illustrating an example of a processing procedure of the CPU 7 regarding reading of information recorded on the recording medium 20. The processing procedure of the CPU 7 relating to the reading of information recorded on the recording medium 20 is executed when a buffer characteristic information input operation is performed by the user. Further, in the storage unit 8, when the vehicle speed is represented by V, each vehicle speed of V = 0 km / h, 0 km / h <V <30 km / h, V ≦ 30 km / h, predetermined buffer characteristic information, Assume that a table associated with each servo gain is stored. In step y1, it is determined whether or not the buffer characteristic information given from the key input unit 10 is stored in the storage unit 8. If the buffer characteristic information is stored in the storage unit 8, the process proceeds to step y2 and stored. Otherwise, go to step y4. In step y2, the vehicle speed is calculated based on the vehicle speed pulse signal given from the speed detector 12. In step y3, the servo gain associated with the buffer characteristic information given from the key input unit 10 and the vehicle speed calculated in step y2 is read from the storage unit 8, and the read servo gain is given to the DSP 4. After performing step y3, the process proceeds to step y6. In step y4, the buffer characteristic information given from the key input unit 10 is stored in the storage unit 8. In step y5, a predetermined servo gain stored in advance from the storage unit 8 is read, and the read servo gain is given to the DSP 4. After performing step y5, the process proceeds to step y6.

  Since the processing from step y6 to step y14 is the same as the processing from step c2 to step c10 shown in the flowchart of FIG. 4, the description of the processing from step y6 to step y14 is omitted. After performing the processes of step y9, step y12, and step y14, the process proceeds to step y15. In step y15, the servo gain updated in any of step y9, step y12, and step y14, predetermined vibration related information, in this embodiment, vehicle speed, and buffer characteristic information are associated with each other and stored in storage unit 8. . In step y16, the servo gain updated in any of step y9, step y12 and step y14 is given to DSP4. After performing the process of step y16, the process returns to step y6 and the same process as described above is performed. The reading operation of the information recorded on the recording medium 20 is performed according to the processing procedure of the CPU 7 according to the flowchart shown in FIG. 16 and the processing procedure of the DSP 4 according to the flowchart shown in FIG. The operation is repeated until a command input operation for ending reproduction of the recording medium 20 is performed. In the present embodiment, processing for calculating the vehicle speed is performed in step y2, processing for providing the servo gain associated with the buffer characteristic information and the calculated vehicle speed to DSP 4 in step y3, and in steps y6 to y14, Although the process of step c2 to step c10 shown in the flowchart of FIG. 4 is performed, the present invention is not limited to the structure as described above. For example, in another embodiment of the present invention, road noise having a predetermined frequency is acquired in step y2, and in step y3, buffer characteristic information and a servo gain associated with the acquired road noise are given to DSP 4, and step y6 In step y14, the processes in steps h2 to h10 shown in the flowchart of FIG. 7 described above may be performed. In this case, in step y15 shown in the flowchart of FIG. 16, the servo gain updated in any of step y9, step y12, and step y14, predetermined road noise, and buffer characteristic information are associated with each other and stored in the storage unit 8. Let In still another embodiment of the present invention, predetermined road information is acquired in step y2, and in step y3, a servo gain associated with the buffer characteristic information and the acquired road information is given to DSP 4, and steps y6 to step are performed. In y14, the processing of step q2 to step q10 shown in the flowchart of FIG. 10 described above may be performed. In this case, in step y15 shown in the flowchart of FIG. 16, the servo gain updated in any one of step y9, step y12, and step y14, predetermined road information, and buffer characteristic information are associated with each other and stored in the storage unit 8. Let

  As described above, according to the present embodiment, the storage unit 8 stores buffer characteristic information, vibration-related information, and servo gain that are determined in advance when buffering an external impact in association with each other. The damper 14 buffers an external impact. The key input unit 10 is operated by the user, and predetermined shock-absorbing characteristic information for buffering an external impact is set by the damper 14. The buffer characteristic information input by the user operating the key input unit 10 is given to the CPU 7. When the buffer characteristic information is given from the key input unit 10, the CPU 7 receives the servo characteristic associated with the buffer characteristic information given from the key input unit 10, the predetermined vibration related information, and the vehicle speed in this embodiment. And the read servo gain is given to the DSP 4. The DSP 4 generates a servo control signal for performing servo control such as focus servo control and track servo control based on the servo gain supplied from the CPU 7, and provides the generated servo control signal to the servo driver unit 5. The servo driver unit 5 performs servo control by supplying a predetermined drive voltage or drive current to the optical pickup 2 based on a servo control signal given from the DSP. Thus, the optical pickup 2 reads information recorded on the recording medium 20. When image data is read by the optical pickup 2, the read image data is converted into an image, and the image is displayed on the display unit 9. Further, when audio data is read by the optical pickup 2, the read audio data is converted into audio, and the audio is output from the speaker of the audio input / output unit 11. As described above, when the key input unit 10 is operated by the user and predetermined shock-absorbing characteristic information for buffering an external impact is set by the damper 14, the key input unit 10 is operated by the CPU 7. The servo gain associated with the set buffer characteristic information and the vibration related information is read, and the information recorded on the recording medium 20 is read by the optical pickup 2 based on the read servo gain. Done. Therefore, for each set buffer characteristic information, the servo gain is dynamically changed according to the vibration-related information, in this embodiment, the vehicle speed, and the information recorded on the recording medium 20 is accurately read. be able to. As a result, for example, when the recording medium 20 is reproduced, the sound output from the speaker of the sound input / output unit 11 has a sound skip that changes discontinuously due to vibrations or scratches formed on the recording medium 20. It can be reduced as much as possible.

  In the present embodiment, the servo gain related information associated with the buffer characteristic information set by operating the key input unit 10 by the user and the predetermined vibration related information such as the vehicle speed is read from the storage unit 8. The configuration of the navigation device 1 that reads information recorded on the recording medium 20 by the optical pickup 2 based on the read servo gain related information has been described. However, in another embodiment of the present invention, the key is set by the user. Servo gain related information associated with the buffer characteristic information set by operating the input unit 10 is read from the storage unit 8 and recorded on the recording medium 20 by the optical pickup 2 based on the read servo gain related information. In this case, the same effect as this embodiment can be obtained. Kill.

It is a block diagram which shows the structure of the navigation apparatus 1 which is one Embodiment of this invention. 4 is a flowchart illustrating an example of a processing procedure of a CPU 7 related to reading information recorded on a recording medium 20. 4 is a flowchart illustrating an example of a processing procedure of the DSP 4 regarding reading of information recorded on a recording medium 20. 4 is a flowchart illustrating an example of a processing procedure of a CPU 7 related to reading information recorded on a recording medium 20. It is a flowchart which shows the process sequence of CPU7 regarding the 1st-3rd servo gain update process of FIG. 4 is a flowchart illustrating an example of a processing procedure of a CPU 7 related to reading information recorded on a recording medium 20. 4 is a flowchart illustrating an example of a processing procedure of a CPU 7 related to reading information recorded on a recording medium 20. It is a flowchart which shows the process sequence of CPU7 regarding the 1st-3rd servo gain update process of FIG. 4 is a flowchart illustrating an example of a processing procedure of a CPU 7 related to reading information recorded on a recording medium 20. 7 is a flowchart illustrating an example of a processing procedure of a CPU 7 regarding reading of information recorded on a recording medium. It is a flowchart which shows the process sequence of CPU7 regarding the 1st-3rd servo gain update process of FIG. 4 is a flowchart illustrating an example of a processing procedure of a CPU 7 related to reading information recorded on a recording medium 20. 4 is a flowchart illustrating an example of a processing procedure of a CPU 7 related to reading information recorded on a recording medium 20. 4 is a flowchart illustrating an example of a processing procedure of a CPU 7 related to reading information recorded on a recording medium 20. 4 is a flowchart illustrating an example of a processing procedure of a CPU 7 related to reading information recorded on a recording medium 20. 4 is a flowchart illustrating an example of a processing procedure of a CPU 7 related to reading information recorded on a recording medium 20.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Navigation apparatus 2 Optical pick-up 3 RF (Radio Frequency) amplifier 4 DSP (Digital Signal Processor)
5 Motor driver 6 Spindle motor 7 CPU (Central Processing Unit)
DESCRIPTION OF SYMBOLS 8 Memory | storage part 9 Display part 10 Key input part 11 Voice input / output part 12 Speed detection part 13 Position detection part 14 Damper 20 Recording medium 30 Optical disk apparatus

Claims (14)

Storage means for associating and storing vibration related information related to vibration and servo gain related information related to servo gain;
Reading means for reading information recorded on the recording medium;
Vibration state detecting means for detecting a vibration state;
Servo gain related information associated with vibration related information corresponding to the vibration state detected by the vibration state detecting means is extracted from the storage means, and the reading operation of the reading means is performed based on the extracted servo gain related information. And a control means for controlling the disk device. Further comprising an abnormality detection means for detecting that an abnormality has occurred in the information read by the reading means;
When the abnormality detecting means detects that an abnormality has occurred in the information read by the reading means, the control means associates with vibration related information corresponding to the vibration state detected by the vibration state detecting means. 2. The disk apparatus according to claim 1, wherein the read servo gain related information is extracted from the storage means, and the reading operation of the reading means is controlled based on the extracted servo gain related information. Reading accuracy detecting means for detecting reading accuracy by the reading means;
The servo gain related information stored in the storage means and the servo gain related information are changed so that the servo gain is changed, and the read accuracy detected by the read accuracy detecting means is the highest, and the read accuracy is the highest. The disk device according to claim 1, further comprising information updating means capable of updating to vibration related information at a later time. The servo gain related information stored in the storage means includes at least one of a focus servo gain and a track servo gain,
The control means extracts at least one of a focus servo gain and a track servo gain associated with vibration related information corresponding to the vibration state detected by the vibration detection means from the storage means, and extracts the focus 4. The disk device according to claim 1, wherein a reading operation of the reading unit is controlled based on at least one of a servo gain and a track servo gain. A disk device provided in the moving body, further comprising speed detection means for detecting a moving speed of the moving body,
The vibration related information stored in the storage means is information on the moving speed of the moving body,
The control means extracts servo gain related information associated with the moving speed of the moving body detected by the speed detecting means from the storage means, and based on the extracted servo gain related information, the reading operation of the reading means 5. The disk device according to claim 1, wherein the disk device is controlled. A disk device provided in a moving body, further comprising sound collection means for collecting acoustic noise generated around the moving body,
The vibration related information stored in the storage means is information of acoustic noise,
The control means extracts servo gain related information associated with the acoustic noise collected by the sound collecting means from the storage means, and controls the reading operation of the reading means based on the extracted servo gain related information. The disk device according to claim 1, wherein the disk device is a disk device. A disk device provided in a moving body, further comprising road information acquisition means for acquiring road information relating to a road on which the moving body moves,
The vibration related information stored in the storage means is road information related to a road,
The control means extracts servo gain related information associated with the road information acquired by the road information acquisition means from the storage means, and controls the reading operation of the reading means based on the extracted servo gain related information. The disk device according to claim 1, wherein the disk device is a disk device. Further comprising identification information acquisition means for acquiring recording medium identification information for identifying a recording medium from which recorded information is to be read,
The storage means further stores recording medium identification information, vibration related information and servo gain related information in association with each other for each of the plurality of recording media,
The control means extracts servo gain related information associated with the recording medium identification information acquired by the identification information acquisition means and vibration related information from the storage means, and based on the extracted servo gain related information, 5. The disk device according to claim 1, wherein a reading operation of the reading unit is controlled. The storage means further stores the servo gain related information in association with reading position information relating to a predetermined reading position of the recording medium,
The control means extracts servo gain related information associated with reading position information from the storage means according to the reading position of the recording medium, and performs the reading operation of the reading means based on the extracted servo gain related information. The disk device according to claim 1, wherein the disk device is controlled. A determination unit that determines whether the road information acquired by the road information acquisition unit is similar to the road information stored in the storage unit;
When the determination unit determines that the road information acquired by the road information acquisition unit is similar to the road information stored in the storage unit, the control unit acquires the road information acquisition unit. Servo gain related information associated with road information similar to the road information is extracted from the storage means, and the reading operation of the reading means is controlled based on the extracted servo gain related information. Item 8. The disk device according to Item 7. A disk device provided in a moving body, further comprising position information acquisition means for acquiring moving body position information representing the position of the moving body,
The storage means further stores the moving body position information and the servo gain related information in association with each other,
The control means extracts servo gain related information associated with the moving body position information acquired by the position information acquisition means from the storage means, and based on the extracted servo gain related information, the reading operation of the reading means 11. The disk device according to claim 10, wherein the disk device is controlled. A disk device provided via a damper means for buffering an impact from the outside, further comprising a characteristic information setting means for setting a buffer characteristic information when the shock from the outside is buffered by the damper means,
The storage means further stores buffer characteristic information, the vibration related information, and the servo gain related information in association with each other,
When the buffer characteristic information is set by the characteristic information setting unit, the control unit stores the buffer gain information set by the characteristic information setting unit and the servo gain related information associated with the vibration related information. The disk device according to claim 1, wherein the reading operation of the reading unit is controlled based on the servo gain related information extracted from the unit. A navigation device that is provided in a moving body, has a built-in disk device, and performs route guidance,
Road information acquisition means for acquiring road information about the road on which the moving body moves;
Storage means for storing road information related to a road and servo gain related information related to servo gain in association with each other;
Reading means for reading information recorded on the recording medium;
Servo gain related information associated with the road information acquired by the road information acquiring means is extracted from the storage means, and control means for controlling the reading operation of the reading means based on the extracted servo gain related information; A navigation device comprising: A disk device provided via a damper means for buffering an external impact,
Characteristic information setting means for setting buffer characteristic information when buffering impact from outside by the damper means;
Storage means for associating and storing the buffer characteristic information, vibration related information related to vibration, and servo gain related information related to servo gain;
Reading means for reading information recorded on the recording medium;
When the buffer characteristic information is set by the characteristic information setting unit, the servo gain related information associated with the buffer characteristic information and the vibration related information is extracted from the storage unit, and based on the extracted servo gain related information, And a control unit that controls a reading operation of the reading unit.

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