JP3462672B2 - Information playback device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mini disk device (hereinafter referred to as a mini disk device) which performs time axis compression of information data such as audio data, reads it from a recording medium such as a digitally recorded disk, expands the time axis, and reproduces it. , MD devices) and the like.

[0002]

2. Description of the Related Art In a MD device, data is read from a disc on which audio data is time-axis-compressed and digitally recorded and expanded on the time-axis, and this is digital-to-analog converted and reproduced. In the case of this MD device, the audio data from the disk is usually read at a speed of 1.4 Mbit / sec and the compression is released at a speed of 0.3 Mbit / sec.

Therefore, in this MD device, in order to absorb the difference between the data reading speed of the pickup and the sending speed of the data reproduced by expanding the time axis,
The time-axis-compressed audio data read from the disk is temporarily stored in a semiconductor memory, and the data is read from the semiconductor memory at a speed of 0.3 Mbit / sec and reproduced.

Further, in this MD device, the time-axis compressed audio data read from the disc is utilized by utilizing the difference between the data reading speed of the above-mentioned pickup and the sending-out speed of the data which is expanded and reproduced on the time axis. Is always stored in the semiconductor memory in a predetermined amount or more. By doing this, even if disturbance such as vibration is applied to the main body and the pickup is deviated from the correct track, if the pickup is returned to the correct track before the data in the semiconductor memory is gone, the reproduced sound will not be interrupted. can do.

The semiconductor memory as described above is a so-called shock proof memory, and a conventional MD device normally uses a 4 Mbit D-RAM. During playback, this shock proof memory functions as a WORKRAM in which a part of its capacity absorbs the difference in data transfer rate of data input / output to / from the memory, and the rest thereof is the shock or track jump described above. It is used for so-called shock proofing.

That is, when the shock proof memory is a 4 Mbit D-RAM, the difference in processing speed between reading audio data from a disk and extending the time axis is 1.1 M.
It is bit / sec, and the memory capacity becomes full in about 4 seconds (4Mbit / 1.1Mbit / sec ^-1 ) after the start of reading the audio data from the disc, and the playback time is about 11 seconds ( Data of 4 Mbit / 0.3 Mbit / sec ^-1 ) is stored.

Therefore, when the stored data becomes full, the shock proof memory does not store the audio data read from the disk for a predetermined time, and only the data is read from the memory. .
As a result, an empty area is created in a part of the capacity of the shock proof memory, so that the audio data read from the disk is sequentially stored again in this empty area, and when the memory data becomes full, The disk is idled for a predetermined time, and the same operation is repeated thereafter.

On the other hand, in a portable MD device which is easy to carry, when the MD device is used for portable use, a rechargeable battery or a dry battery is usually used as a power source. In this case, since the time during which the battery can be continuously used without changing the battery is limited, it is desired to reduce the power consumption as much as possible and to use the battery for a long time.

Therefore, for example, Japanese Patent Laid-Open No. 5-342585.
The gazette discloses the following technique. Recording information reading means (for example, pickup, RF) for reading out the above-mentioned information data from a recording medium (for example, an optical disk or the like) on which time-axis-compressed information data is digitally recorded.
(Amplifier, decoding / signal processing circuit, servo circuit, driver circuit, spindle motor, feed motor, etc.), and a memory having an area for storing the information data read by the recording information reading means. Means (for example, 4 Mbit D-RAM), the information data read by the recording information reading means is once written in the storage means, and the information data is written from the storage means at a slower speed than the writing speed. In an information reproducing device such as an MD device which reads out and reproduces information by time-expanding the information data, switching means for switching whether or not power is supplied from a power source such as a battery to the recorded information reading means, When the amount of information data held in the storage means reaches the storage capacity of the storage means, the power supply to the recording information reading means is supplied. Control means for controlling the switching operation of the switching means, so that the control means reads the recorded information when the storage amount of the information data in the storage means becomes a predetermined amount or less. The switching operation of the switching means is controlled so that the power supply to the means is restarted, and the writing of the information data to the storage means is restarted before the information data in the storage means becomes empty. There is.

Further, it has a switching means for switching whether or not the power source is supplied to the recording information reading means, and a mode selecting means for selecting either the first mode or the second mode. When the first mode is selected by the mode selecting means, the control means supplies power to the recorded information reading means when the storage amount of the information data in the storage means reaches the storage capacity of the storage means. When the switching operation of the switching means is controlled so as not to be performed and the storage amount of the information data in the storage means becomes equal to or less than a predetermined amount,
The switching operation of the switching means is controlled so that the power supply to the recorded information reading means is restarted, and the operation of the writing means is controlled to restart the writing of the information data to the storage means, while the mode selection is performed. When the second mode is selected by the means, the operation of the writing means is controlled so that the shock proof information data is always held in the storage means at a predetermined amount or more.

[0011]

However, in a portable MD device using a battery as a power source, the voltage of the power source is checked during operation, and when the voltage falls below a preset voltage value, the operation of the device is stopped, It is designed to end playback. Therefore, when the storage amount of the information data in the storage means almost reaches the storage capacity of the storage means, as in the technique disclosed in Japanese Patent Laid-Open No. 5-342585, the power supply to the recording information reading means is reduced. The switching operation of the switching means is controlled so that the power is not supplied, and when the storage amount of the information data in the storage means is equal to or less than a predetermined amount, the power supply to the recording information reading means is switched to be restarted. In the case of a configuration in which the switching operation of the means is controlled and the operation of the writing means is controlled to restart the writing of the information data to the storage means, the supply of the power source to the recorded information reading means is restarted, When the pickup actuator, spindle motor, or drive circuit starts to operate, a transient peak current may occur, causing the power supply voltage to temporarily decrease and falling below the playback stop setting voltage. , When such a problem arises in that the end of the reproduction operation.

[0012]

In order to solve the above-mentioned problems, the information reproducing apparatus according to the invention of claim 1 records the information data read from a recording medium on which time-axis compressed information data is digitally recorded. An information reading unit and a storage unit for storing the information data read by the recording information reading unit are provided, the information data read from the recording medium is once written in the storage unit, and a speed slower than the writing speed. In the information reproducing apparatus for reproducing information by time-expanding the information data read from the storage means, the switching means for switching the supply of the power source to the recorded information reading means and the information stored in the storage means. When the storage amount of the information data substantially reaches the storage capacity of the storage means, the switching means is controlled so as to control the supply of the power source to the recording information reading means. Control means for controlling the switching means so that when the information amount of the information data in the storage means becomes equal to or less than a predetermined amount, the supply of the power source to the recording information reading means becomes a steady value. In the information reproducing apparatus for restarting the writing of the information data into the storage means before the information data in the storage means is emptied, the voltage detection means for detecting the voltage of the power supply for driving the apparatus is provided. The switching operation of the switching means is controlled only when the voltage value obtained by the voltage detecting means is within a predetermined range set in advance.

According to the structure of the above-mentioned claim 1, the information data read from the recording medium by the recording information reading means is once written in the storage means, and is read from the storage means at a speed slower than the writing speed. Is played. Therefore,
Information data is accumulated in the storage means due to the difference between the writing speed and the reading speed. Then, only when the voltage value obtained by the voltage detecting means for detecting the voltage of the power supply for driving the apparatus is within the preset range, the control means controls the power supply to the recording information reading means. The switching means is switched so that the supply is not performed. As a result, the storage of the information data in the storage means is temporarily suspended, and only the data is read. In this case, unlike the idle reading, the supply of the power supply to the stored information reading means is stopped, so that the power consumption of the device is reduced as compared with the normal reproduction.

When the reproduction is performed in the above state, the storage amount of the information data in the storage means decreases with time, and the information data in the storage means becomes empty after a predetermined time, but the control means operates as described above. When the storage amount of the information data in the storage means becomes equal to or less than a predetermined amount, the switching operation of the switching means is controlled so that the power supply to the recording information reading means is restarted, and the information in the storage means is controlled. Writing of information data to the storage means is restarted before the data becomes empty. As a result, the information data is stored again in the storage means, and the reproducing operation is not interrupted.

Further, when the voltage value obtained by the voltage detecting means is out of the preset range, the control of the switching operation is stopped. As a result, the rechargeable battery, the dry battery, etc. can be operated even though the device is still operable due to the temporary decrease in the power supply voltage due to the transient current when the power supply to the recording information reading means is restarted as in the prior art. It is possible to determine that the power supply of the device has been exhausted and not stop the reproducing operation or the operation of the apparatus.

In the information reproducing apparatus according to the second aspect of the invention, the recording information reading means for reading the information data from the recording medium on which the time-axis compressed information data is digitally recorded and the recording information reading means are provided. A storage means for storing the read information data is provided, and the information data read from the recording medium is once written into the storage means,
An information reproducing apparatus for reproducing information by time-expanding the information data read from the storage means at a speed slower than the writing speed, and a switching means for switching the supply of power to the recorded information reading means, First mode or second
When a first mode is selected by the mode selecting means, the value obtained by the voltage detecting means of the power source for driving the device is Only when within the set range, if the storage amount of the information data stored in the storage means substantially reaches the storage capacity of the storage means, the supply of power source power to the recorded information reading means is controlled. Control the switching means, and when the storage amount of the information amount data in the storage means becomes less than or equal to a predetermined amount, the switching means is controlled so that the power supply to the recording information reading means is set to a predetermined value. At the same time, the operation of the writing means for writing the information data read out from the recording information reading means into the storage means is controlled to restart the writing of the information data into the storage means while the mode selection is performed. When the second mode is selected by the means, a control means for controlling the operation of the writing means is provided so that the shock proof information data in the storage means is always held at a predetermined amount or more. And

Therefore, according to the structure of claim 2, in addition to the structure of claim 1, there is provided a mode selection means for selecting a setting mode of either the first mode or the second mode. When the first mode is selected by the mode selecting means and the voltage value obtained from the power supply detecting means is within a preset range, the power supply of the recording information reading means is turned on / off as in the configuration of claim 1. Is repeated to reduce power consumption during reproduction. That is, at this time, the power save mode is set.

On the other hand, when the second mode is selected by the mode selection means, the control means writes the shock proof information data in the storage means so that the capacity of the storage means is always almost full. Control the behavior of. That is,
When the second mode is selected, the storage means is used as the full shock proof mode.

Further, in the information reproducing apparatus according to a third aspect of the present invention, in the configuration of the second aspect, the mode selecting means can manually select a setting mode of either the first mode or the second mode. It is a switch.

As described above, according to the selection result of the mode selection means, the storage means is set to the power save mode or the full save mode.
The shock-proof mode can be switched to use, and if a manual switch is used as the mode selecting means as described in claim 3, the user can arbitrarily select the setting mode according to the purpose. For example, when the information reproducing apparatus is used by using a battery as a power source, it can be used for a long time by selecting the first mode.

However, when the voltage of the battery deviates from the predetermined value due to the exhaustion of the battery, even if the mode selecting means is selected in the first mode, the second mode is automatically set and the power supply of the stored information reading means is set. It is possible to prevent the operation of the device from being stopped due to a transient phenomenon such as ON / OFF. On the other hand, when the second mode is selected, the writing is performed so that the storage means is almost full, so that it is possible to prevent the disturbance of the reproduction information due to the disturbance or the like.

According to a fourth aspect of the present invention, in the information reproducing apparatus according to the second aspect, the mode selecting means selects the first mode or the second mode according to the read state of the information data of the recorded information reading means. It is characterized in that it is an automatic mode selection means for automatically selecting one of the setting modes.

When the mode selecting means is an automatic mode setting means as described in claim 4, the setting mode can be automatically selected according to the read state of the information data of the recording information means. For example, since the automatic mode selection means has few errors, the error cycle is long, and the fluctuation of the servo voltage is small, when it is determined that the shock proof capacity may be small, the first mode is selected. The second mode is selected when it is determined that the capacity for shock proof must be large because there are many errors and the error cycle is short or the fluctuation of the servo voltage is large.

That is, in the prior art, even if the number of errors is small, the storage means is always filled with shock proof information data. Since the means is used for power saving, the power consumption can be reduced accordingly.

In the information reproducing apparatus according to a fifth aspect of the present invention, in the configuration of the second aspect, the power source means for supplying power to the apparatus from a plurality of power sources and the voltage of each power source of the power source means are detected. And a power source selecting means for automatically selecting a power source having the highest voltage according to the voltage value obtained from the voltage detecting means, and when the mode selecting means selects the second mode, It is characterized in that the operation of the writing means is controlled so that the shock proof information data in the storage means is always held at a predetermined amount or more.

Therefore, according to the fifth aspect of the present invention, power can be supplied from a plurality of power sources, and the highest voltage can be determined by the voltage value obtained by the voltage detecting means for detecting the voltage of each power source. You can automatically select the power source you have. In this case, since the device can withstand a long-time operation by using a plurality of power sources in combination, the mode selection can be fixed only to the second mode and the disturbance of the reproduction information due to disturbance or the like can be prevented.

In the information reproducing apparatus according to a sixth aspect of the present invention, in the configuration of the second aspect, the power source means for supplying power to the apparatus from a plurality of power sources and the voltage of each power source of the power source means are detected. And a power supply selection means for automatically selecting the power supply having the highest voltage according to the voltage value obtained by the voltage detection means, and the power supply voltage when the device is operated by the power supply selected by the power supply selection means. When the fluctuation is detected by the voltage detecting means and the fluctuation range of the power supply voltage exceeds a preset value, the mode selecting means drives the device by using the selected specific power source, The second mode is automatically selected, and when the fluctuation range of the power supply voltage is within the set value, the mode selecting means selects the first mode.

Therefore, according to the present invention, power can be supplied from a plurality of power sources, and the power source having the highest power source voltage can be determined by the voltage value obtained by the voltage detecting means for detecting the voltage of each power source. It can be selected automatically. In this case, when the fluctuation range of the power supply voltage during the operation of the device by the selected power supply exceeds the preset value, the mode selecting means sets the selection mode to the second mode, and the power supply voltage width is within the set value. , The first mode is selected.

As a result, in the case of a power source having a large internal impedance, it operates in the second mode, and the supply voltage caused by a transient phenomenon at the time of powering ON / OFF of the stored information reading means or at the time of servo startup. Due to the large fluctuations,
It is possible to prevent the operation from becoming unstable or stop the operation of the apparatus, and in the case of a power source with a small internal impedance, by setting the mode to the first mode, it is possible to reduce power consumption.

[0030]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram of an embodiment in which the information reproducing apparatus of the present invention is applied to an MD device. As shown in FIG. 1, time-base compressed audio data (information data)
The recording information reading means for reading the above-mentioned audio data from the mini-disc 1 on which is digitally recorded is a pickup 2, an RF amplifier 3, a decoder / signal processing circuit 4, a servo circuit 11, a driver circuit 12, a spindle motor 13
And the feed motor 14. During reproduction, the mini disk 1 is rotated by a spindle motor 13 driven by a driver circuit 12, and the pickup 2 is moved by a feed motor 14 driven by the driver circuit 12 in the radial direction of the mini disk 1. Then, the pickup 2 reads the audio data recorded on the mini disk 1. The audio data read by the pickup 2 is amplified by the RF amplifier 3,
It is sent to the decoder / signal processing circuit 4.

Further, the RF amplifier 3 uses the audio data read from the pickup 2 for focusing and
A servo control signal such as an error signal or a tracking error signal is generated and output to the servo circuit 11. The servo circuit 11 uses the servo control signal from the RF amplifier 3 and the control signal from a system control microcomputer (hereinafter referred to as a system control microcomputer) 10 to perform focus, tracking and spin servo. Like to call
The driver circuit 12 is controlled. Then, the driver circuit 12 receives the control signal from the servo circuit 11 to pick up the pickup 2 and the feed motor 14.
And drives the spindle motor 13.

The decoder / signal processing circuit 4 demodulates the signal amplified by the RF amplifier 3 and further performs signal processing such as error correction, and the signal processed signal is shocked as a writing means and a memory reading means. -Proof memory controller (hereinafter abbreviated as memory controller) 5
Send to. The memory controller 5 serves as a writing means,
The signals sent from the decoder / signal processing circuit 4 are sequentially written in the shock proof memory 6 as a storage means. In the present embodiment, a 4 Mbit D-RAM is used as the shock proof memory 6.

The memory controller 5 also serves as a memory reading means to read the voice data stored in the shock proof memory 6 at a rate of 0.3 Mbit / sec and send the data to the voice decompression circuit 7. The voice decompression circuit 7 decompresses the sent data by decompressing it in time according to a predetermined format, and sends it to the D / A converter 8. The D / A converter 8 converts the sent digital signal into an analog signal to generate a voice signal. And
This audio signal passes through the volume control and amplifier circuit 9,
The sound is output from the headphones 21.

The system control microcomputer 10 detects the voltage of the power supply A (for example, a built-in lithium-ion battery) 22 detected by the power supply voltage detection circuit A18 and the power supply B detected by the power supply voltage detection circuit B19 (for example, an AC adapter or a dry battery). ) 23 voltage is input to determine which power supply is used, a select signal is sent to the power supply input switching circuit 17, and power is supplied to the power supply circuit 16 from the selected power supply. The power supply circuit 16 is composed of a DC-DC conversion circuit or the like, and supplies a necessary voltage to each part so that the device can be operated. The power supply circuit 16 also supplies power to the power supply ON / OFF circuit 15.

Further, the pickup 2 reads the voice data stored in the mini disk 1 at a speed of 1.4 Mbit / sec, while the voice decompression circuit 7 is 0.3 Mbi / sec.
It is configured to solve temporal compression at a rate of t. That is, the difference between the process of reading the audio data from the mini disc 1 and the time-axis expansion process is 1.1 Mbit / s, and the time-axis compression is released in the shock proof memory 6 due to the difference in the processing speed. The previous data will be accumulated.

In the case of this embodiment, the shock proof
Since the memory 6 is 4 Mbit, the capacity of the shock proof memory 6 is the mini disk 1 by the pickup 2.
The memory capacity becomes full in about 4 seconds after the start of reading the data from, and the data for about 12 seconds as the reproduction time is stored.

When the capacity of the audio data in the shock proof memory 6 becomes full as described above, the power saving mode as the first mode or the shock saving mode as the second mode is set in the MD device. Depending on which proof mode is set, the following different playback operations are performed.

The shock proof mode is a normal reproduction mode which has been conventionally performed, and in this case, the shock proof memory 6 is used for shock proof. On the other hand, the above power save
In the mode, not only the shock proof memory 6 is used for shock proof, but also for power save in which power consumption can be reduced.

In the present MD device, the power is turned on / off as switching means for switching the presence / absence of power supply to the pickup 2 and the RF amplifier 3 which constitute the recording information reading means.
It has an OFF circuit 15. The power ON / OFF circuit 15 is a system control
The system control microcomputer 10 operates by the control signal from the microcomputer 10.
A power save switch 20, which can be set to a power save mode by a user's operation, is connected.

Then, the above power save switch 2
When 0 is turned on, the system control microcomputer 10 automatically selects the power save mode if conditions such as detection values from the power supply voltage detection circuits A and B are prepared. If the conditions are not met, the shock proof mode is selected.

On the other hand, the power save switch 20 is turned off.
When the FF is applied, the shock proof mode is forcibly selected by the system control microcomputer 10. First, the case where the shock proof mode is set will be described below.
When the audio data in the shock proof memory 6 becomes full, the system control microcomputer 10 causes the audio data read from the mini disk 1 by the pickup 2 to be transferred to the shock proof memory 6 for a predetermined time. The memory controller 5 is controlled so as not to be stored in the memory, and the mini disk 1 is read blank.

Therefore, during this period, only the data is read from the shock proof memory 6 at a speed of 0.3 Mbit / s, which causes an empty area in a part of the capacity of the shock proof memory 6. After the above predetermined time,
The system control microcomputer 10 causes the pickup 2 to jump to a track before the capacity of the shock proof memory 6 is full, and the audio data read from the mini disc 1 by the pickup 2 is transferred to the shock proof memory. The memory controller 5 is controlled so as to be stored in the memory 6.

After that, when the capacity of the audio data in the shock proof memory 6 becomes full again, the disk is idled for a predetermined time, and the same operation is repeated. Due to the above, the shock proof data is always secured in the shock proof memory 6.

Next, the case where the power save mode is set will be described below. When the capacity of the audio data in the shock proof memory 6 becomes full, the system control microcomputer 10 turns off the power sources of the pickup 2 and the RF amplifier 3 and turns on / off the power source so that the power supply is cut off. Control the circuit 15.

Further, the system control microcomputer 10 sets the decoder / signal processing circuit 4 and the servo circuit 11 in the low power consumption mode, and unlike the servo-on state, causes the spindle motor 13 to only roughly rotate. . Electric power is supplied from the servo circuit 11 to the driver circuit 12 to the feed motor 14 and the actuator of the pickup 2.
To the output OFF (no power supply). Further, in some cases, the rough rotation of the spindle motor 13 may not be performed.

As a result, the operation of storing the voice data in the shock proof memory 6 is temporarily interrupted, and the sound data is stored at 0.
Data is read from the shock proof memory 6 at a speed of 3 Mbits and reproduced as an audio signal. In this case, unlike the idle reading of the mini disk 1, the power of each component of the recorded information reading means is turned off or in the low power consumption mode, so that the power consumption of the device is naturally reduced as compared with the normal reproduction. It

If reproduction is performed in the above-mentioned state, the data in the shock proof memory 6 becomes empty after a predetermined time has passed (that is, after about 12 seconds), but before the data becomes empty. The system control microcomputer 10 controls the power ON / OFF circuit 15 so as to turn on the power sources of the pickup 2 and the RF amplifier 3. Also, the system
The control microcomputer 10 releases the low power consumption mode of the decoder / signal processing circuit 4 and the servo circuit 11.
As a result, the reading of the audio data from the mini disk 1 is restarted, the audio data is stored again in the shock proof memory 6, and the reproducing operation is not interrupted.

Next, the operation of this apparatus will be specifically described with reference to the flow chart shown in FIG. First, power supply A-2
2 or the power supply B23 to select and use the power supply voltage detection circuit A.1 in step s1.
The voltage of the power supply A.22 is confirmed by 8 and the voltage of the power supply B.23 is confirmed by the power supply voltage detection circuit B.19 in step s2. In step 3, it is confirmed whether the power supply input switching circuit 17 is connected to the power supply A or B, and the power supply A
If 18 is connected, that is, selected, go to step s4; otherwise, go to step s5.

In step s4, the power supply voltage detection circuit A
The voltage of the power supply A / 22 obtained from 18 is V
Compare if β or more, and if so, step s
If not, go to step s7. On the other hand, in step s5, it is determined whether the voltage of the power source B.23 obtained from the power source voltage detecting circuit B.19 is higher than the voltage of the power source A.22 obtained from the power source voltage detecting circuit A.18 by Vα or more. Comparison is made, and if so, the process proceeds to step s7, and if different, the process proceeds to step s6. In step s6, power supply A.22
In step s7, the power supply input switching circuit 17 is switched so as to select the power supply B23, and either power supply is connected to the device.

At step s8, the voltage V of the selected power source
_i is reconfirmed by the power supply voltage detection circuit 18 or 19, and it is compared whether it is the operation stop voltage V _{stop of the} device or more,
If it is lower than V _stop , the operation of the device is stopped. V _stop
In the above case, the process proceeds to step s10. In step s10, the power save switch 20 turns the power save
It is confirmed whether or not the mode is set, and if it is in the power save mode, the process proceeds to step s11. If not, the process proceeds to step s15.

In step s11, it is confirmed whether or not the voltage of the selected power source is within the range of the preset voltage V ₁ or more and V ₂ or less. For example, V ₁ = 3.3V, V ₂ = 4.
In the case of 0 V, the power save operation is possible only when V _i is within this range. Otherwise, step s
Proceed to 15.

In step s12, the fluctuation range of the power supply voltage due to load fluctuation when the power supply is operating is confirmed, and in step s13 it is compared whether the fluctuation range is ΔV or less, and Δ
If it is V or less, the process proceeds to step s14 and the power save operation is performed. If it is larger than ΔV, that is, if the internal impedance of the power supply is larger than the value determined by ΔV, in order to prevent the set from becoming unstable during a transition such as when the servo is turned on in the power save operation, the shock proof operation is performed in step s15. To do. In step s16, it is confirmed whether or not a fixed time (for example, 100 ms) has elapsed, and if it has elapsed, the process returns to step s1. By doing so, safe and power saving operation can be performed.

Next, the shock proof operation will be described with reference to the flow chart shown in FIG. At step m1, the power ON / OFF circuit 15 is turned on, the servo circuit 11 is activated, and the recording information recorded on the mini disk 1 is read at step m2. At step m3, it is confirmed whether or not the recording capacity of the shock proof memory 6 is full.

If the capacity is not full, the process returns to step m2. If the capacity is full, step m4
Then, reading of recorded information from the mini disc 1 by the pickup 2 is stopped. At step m5, it is confirmed whether or not the recording capacity of the shock proof memory 6 becomes smaller than X (for example, 10 seconds), and if it becomes smaller, the process returns to step m2.

If the number has not decreased, step m6
At step m5, the recorded information is read blank, and the process returns to step m5 to check the capacity of the shock proof memory 6. As a result, the shock proof memory 6 always stores information data such as music of X or more (for example, 10 seconds or more).

FIG. 4 is a flow chart showing the operation in the power save mode. In step n1, the power ON / OFF circuit 15 is turned on and the servo circuit 11 is activated. At step n2, the record information recorded on the mini disc 1 is read. At step n3, it is confirmed whether or not the capacity of the shock proof memory 6 is full, and if not, the process returns to step n2.

When the capacity is full, step n4
Then, reading of recorded information is stopped. Step n5
Then, the servo operation by the servo circuit 11 is canceled, the output of the power ON / OFF circuit 15 is turned off, and the power supply to the pickup 2 and the RF amplifier 3 is stopped.

At step n6, shock proof
Since the information data such as music data is read from the memory 6, the amount of memory decreases. Therefore, it is confirmed whether the memory amount is smaller than Y. When it is less than Y (for example, when the remaining time is 4 seconds or less), the process returns to step n1, the servo operation by the servo circuit 11 is activated again, and the reading of the recorded information is restarted.

In the flowchart shown in FIG. 2, a plurality of high power supplies are selected, and the power save operation is performed according to the setting of the power save mode.
If there are multiple power sources connected to the device, as described in (1), only the shock proof operation is performed after selecting which power source to connect.

When only one power source is connected,
That is, in the example of FIG. 1, when only one of the power supply A and the power supply B is connected and the detection result of either the power supply voltage detection circuit A or B becomes 0 V, the power save switch A power save operation may be performed if the conditions are met when the 20 is set to the power save mode.

The power ON / OFF circuit 15 controls only the pickup 2 and the RF amplifier 3.
It is also possible to control the power supply to the driver circuit 12 and the servo circuit 11. In addition, although the shock proof memory of 4 Mbit is used in the present embodiment, the capacity of the shock proof memory is not limited to this, and a power saving operation can be performed by using a larger capacity memory. Then, a further power consumption reduction effect can be obtained.

[0062]

According to the information reproducing apparatus of the first aspect of the present invention,
Switching means for switching the presence / absence of power supply to the recorded information reading means, and supply of power supply to the recorded information reading means when the storage amount of information data in the storage means reaches the storage capacity of the storage means. In order to prevent the above-mentioned change from occurring, the control means for controlling the switching operation of the switching means and the voltage detection means for detecting the voltage of the power supply for driving the apparatus are provided, and the voltage value obtained by the voltage detection means is a predetermined value. Only when the storage capacity of the information data in the storage means reaches the recording capacity, the control means does not supply power to the recorded information reading means, and Before the information data in the storage means becomes empty, the switching operation of the switching means is controlled so that the supply of the power source to the recording information reading means is restarted when the storage amount becomes equal to or less than the predetermined amount. In the A configuration to resume writing information data to the unit.

Therefore, within the range of the power supply voltage at which the apparatus can operate stably and transiently, the power of the recording information reading means is turned on / off and the servo circuit and driver circuit are switched to the low power consumption mode. Since the information is reproduced while being repeated, it is possible to reduce the power consumption of the device during the reproduction.

An information reproducing apparatus according to a second aspect of the invention has a switching means for switching the presence / absence of power supply to the recorded information reading means, a voltage detecting means for detecting the supply voltage of the power source of the apparatus, and a first mode. Alternatively, the control means has a mode selection means for selecting one of the setting modes of the second mode, and when the first mode is selected by the mode selection means, the control means has a predetermined power supply voltage obtained by the voltage detection means. When the storage amount of the information data in the storage means reaches the storage capacity of the storage means, the switching of the switching means is controlled so that the power supply to the recording information reading means is not performed. Then, the servo circuit and the driver circuit are set to the low power consumption mode, and when the storage amount of the information data in the storage unit becomes equal to or less than the predetermined amount, the supply of the power source to the recording information reading unit is restarted. When the second mode is selected by the mode selection means while controlling the switching operation of the switching means and the operation of the writing means to restart the writing of the information data to the storage means, The operation of the writing means is controlled so that the shock proof information data is always held in the means at a predetermined amount or more.

Therefore, when the first mode is selected, the storage means is used for power saving in which the power consumption can be reduced within the predetermined power supply voltage, and the predetermined power supply power is used in the first mode. If out of range or if the second mode is selected, it is used for shock proofing.

In particular, if the manual switch is used as the mode selecting means as in the structure of claim 3, the user can arbitrarily select the setting mode according to the purpose. For example, a rechargeable battery or the like is used as the power source. When the device is used by hand, it is possible to use it for a long time by selecting the first mode. Also, when using in a place where there is a lot of vibration such as in a car, shock can be
Sufficient proof can be obtained and stable playback operation can be performed.

When the automatic mode selecting means is used as the mode selecting means as in claim 4, the setting mode is automatically changed according to the read state of the information data by the recorded information reading means such as an error occurrence situation. Since the selection is performed, it is possible to reduce the power consumption while maintaining the reproduction state in which the reproduction information is relatively not disturbed by disturbance or the like.

Further, when a plurality of power supplies are connected to the apparatus as in the fifth aspect of the invention and the one having the highest voltage is selected from the plurality of power supplies to perform the reproducing operation, Since long-time reproduction can be expected, stable reproduction operation can be performed only in the second mode.

Further, according to the invention of claim 6, the reproducing operation is performed by automatically selecting the first mode or the second mode according to the voltage fluctuation width of the selected power source during the operation of the device. , The internal impedance of the power supply is large, and if it is used only in the first mode, it is possible to continue the operation because the supply voltage fluctuates greatly when the power of the power supply to the recording information output means is turned ON / OFF or when the servo is started. However, it is possible to prevent the operation from becoming unstable and the operation of the device from stopping.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of an embodiment of the present invention.

FIG. 2 is a flow chart for explaining the operation of the present invention.

FIG. 3 is a flow chart for explaining the operation of the present invention.

FIG. 4 is a flow chart for explaining the operation of the present invention.

[Explanation of symbols]

1 mini disc 2 pickups 3 RF amplifier 4 Decoding / signal processing circuit 5 Shock Proof Memory Controller 6 shock proof memory 7 Voice expansion circuit 8 D / A converter 10 System control microcomputer 11 Servo circuit 12 Driver circuit 13 Spindle motor 14 Feed motor 15 Power ON / OFF circuit 16 power supply circuit 17 Power input switching circuit 18 Power supply voltage detection circuit 19 Power supply voltage detection circuit 20 power save switch 22 Power supply A 23 Power supply B

─────────────────────────────────────────────────── ─── Continued Front Page (56) References JP-A-6-302086 (JP, A) JP-A-6-96520 (JP, A) JP-A-6-76456 (JP, A) JP-A-7- 302473 (JP, A) JP 4-310668 (JP, A) JP 4-105270 (JP, A) JP 6-12772 (JP, A) JP 57-205845 (JP, A) Actual Kaihei 6-58460 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) G11B 20/10 G11B 19/00-19/16

Claims (6)

(57) [Claims] 1. A recording information reading means for reading the information data from a recording medium on which time axis compressed information data is digitally recorded, and a storage means for storing the information data read by the recording information reading means. An information reproducing apparatus which is provided and temporarily writes the information data read from the recording medium into the storage means, expands the information data read from the storage means at a speed slower than the writing speed, and reproduces the information. The switching means for switching the supply of the power supply to the recording information reading means and the recording information reading when the storage amount of the information data stored in the storage means substantially reaches the storage capacity of the storage means. When the switching means is controlled so as to suppress the supply of power supply to the means, and when the information amount of the information data in the storage means exceeds a predetermined amount, the above described A control means is provided for controlling the switching means so that the supply of the power supply to the recording information reading means becomes a steady value, and before the information data in the storage means is emptied, the information data in the storage means is stored. In the information reproducing device for resuming writing, a voltage detecting means for detecting the voltage of the power supply for driving the device is provided, and the voltage value obtained by the voltage detecting means is in a predetermined range set in advance, the above An information reproducing apparatus characterized in that a switching operation of a switching means is controlled. 2. A recording information reading means for reading the information data from a recording medium on which time-axis compressed information data is digitally recorded, and a storage means for storing the information data read by the recording information reading means. An information reproducing apparatus which is provided and temporarily writes the information data read from the recording medium into the storage means, expands the information data read from the storage means at a speed slower than the writing speed, and reproduces the information. The switching means for switching the supply of the power source to the recording information reading means and the mode selecting means for selecting one of the first mode and the second mode are provided, and the first mode is selected by the mode selecting means. When is selected, only when the value obtained from the voltage detection means of the power supply for driving the device is within the set range,
If the storage amount of the information data stored in the storage means has substantially reached the storage capacity of the storage means, the switching means is controlled so as to control the supply of power to the recording information reading means. At the same time, when the storage amount of the information data in the storage means becomes equal to or less than a predetermined amount, the switching means is controlled so that the supply of the power source to the record information reading means becomes a predetermined value, and at the same time the record information reading is performed. When the operation of the writing means for writing the information data read from the means to the storage means is controlled to restart the writing of the information data to the storage means while the second mode is selected by the mode selection means, An information reproducing apparatus comprising a control means for controlling the operation of the writing means so that the shock proof information data in the storage means is always held at a predetermined amount or more. 3. The information reproducing apparatus according to claim 2, wherein the mode selecting means is a manual switch capable of arbitrarily selecting a setting mode of either the first mode or the second mode. 4. The mode selecting means is an automatic mode selecting means for automatically selecting a setting mode of either the first mode or the second mode according to the read state of the information data of the recording information reading means. The information reproducing apparatus according to claim 2, wherein: 5. A power supply means for supplying power to the device from a plurality of power supplies, a voltage detection means for detecting a voltage of each power supply of the power supply means, and a highest voltage based on a voltage value obtained by the voltage detection means. Is provided with a power source selecting means for automatically selecting a power source having a power source, and when the mode selecting means is selecting the second mode, the shock proof information data in the storage means is always held at a predetermined amount or more. 3. The information reproducing apparatus according to claim 2, wherein the operation of the writing means is controlled. 6. A power source means for supplying power to the device from a plurality of power sources, a voltage detecting means for detecting a voltage of each power source of the power source means, and a highest voltage based on a voltage value obtained by the voltage detecting means. A power source selecting means for automatically selecting a power source having a power source selecting means for detecting a power source voltage fluctuation at the time of device operation by the power source selected by the power source selecting means,
When the fluctuation range of the power supply voltage exceeds a preset value, the second mode is automatically selected and the power supply voltage is selected only when the device is driven by using the selected specific power supply. 3. The information reproducing apparatus according to claim 2, wherein the mode selecting means selects the first mode when the fluctuation range is within a set value.