JPH0222867Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field This invention reads information signals from a disk on which digitized information signals are recorded, and obtains reproduced analog information signals based on the read digital information signals. The present invention relates to a disk player configured as follows.

BACKGROUND TECHNOLOGY AND PROBLEMS A digital disk player obtains a playback analog audio signal from a disk on which a digitized audio signal is recorded, or a playback analog audio signal from a tape on which a digitized audio signal is recorded. A digital tape recorder that obtains high quality music is attached to the front dashboard of a car so that high-quality music can be listened to inside the car. In addition to the disk player or tape recorder attached to the front dash board, there are a plurality of disks on which digitized audio signals are recorded, and the ones selected from among them are sequentially played. It is conceivable to install a digital disk player having an automatic disk exchange function, which can be taken out and attached to the disk unit, so that reproduced analog audio signals can be continuously obtained. The signal reading section of a disk player equipped with such an automatic disk exchange function requires a relatively large space because it is accompanied by a storage section for multiple disks and an automatic disk exchange mechanism. It will be installed in the huge interior space of the car. In such a case, the disk attached to the front dart board
It is conceivable that a player or tape recorder and a disk player equipped with an automatic disk exchange function share a signal processing circuit section that handles reproduced analog audio signals based on read signals obtained from the respective signal reading sections. When such shared use is implemented, the overall configuration including the disk player or tape recorder attached to the front dart board and the disk player with an automatic disk exchange function is simplified. occurs.

By the way, conventionally proposed disk players for vehicles equipped with an automatic disk exchange function are:
A player main body in which a signal reading section and a signal processing circuit section together with a disk storage section for storing a plurality of disks, an automatic disk exchange mechanism section, and a signal processing circuit section are integrated is installed in a relatively large interior space such as a trunk room. An operating section for operating the player main body is arranged near the driver's seat. In this way, the signal processing circuit section is built into the player body and installed in a trunk room, etc., so when a previously proposed disk player equipped with an automatic disk exchange function for automobiles is used, it is necessary to It is difficult to share the signal processing circuit section with the disk player or tape recorder attached to the dash board, and in the end, each has its own signal processing circuit section, and the overall configuration This has the disadvantage that it cannot be simplified.

Therefore, the signal reading section of a disk player equipped with an automatic disk exchange function is arranged in a relatively large interior space such as the trunk room, and the signal processing circuit section and operation section are arranged, for example, in the front dart board section. By doing so, it is possible to share the signal processing circuit section with the disk player or tape recorder attached to the front dashboard, but in such a case, the signal processing circuit section can be For example, when normal signal transmission is performed in which analog signals are propagated through conductive lines, ignition noise and other engine noise may occur during signal transmission. There is a problem that a large amount of external noise such as noise is mixed in.

Purpose of the invention In view of the above, the present invention provides a signal reading section and a signal processing circuit section that are arranged separately, so that the signal processing circuit section can be shared with other equipment, and a signal reading section and a signal processing circuit section are arranged separately. A disk player suitable for use in a vehicle and equipped with an automatic disk exchange function, in which signal transmission between the computer and the signal processing circuit section is almost unaffected by external noise. The purpose is to provide.

Summary of the invention The disk player according to the invention includes a signal reading section that reads information signals from a disk on which digitized information signals are recorded and obtains a reproduced digital information signal, and a signal reading section that processes the reproduced digital information signals and reproduces analog A signal processing circuit unit that obtains information signals; and a control circuit unit that is connected to an operation unit that performs operations for causing the signal processing circuit unit and the signal reading unit to perform predetermined operations, and generates control signals for the signal reading unit. The signal reading section and the signal processing circuit section and control circuit section are installed separately, and the signal transmission between the signal reading section and the signal processing circuit section and control circuit section is performed using optical fiber. This is done by digital signal transmission. With this configuration, the signal processing circuit section can be shared with other equipment installed separately, simplifying the overall configuration including other equipment, and also making it possible to simplify the overall configuration including other equipment. The adverse effects of external noise on the signal transmission path between the signal reading section and the signal processing circuit section can be significantly reduced.

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings.

The figure shows an example of a disc player according to the present invention. In this example, a recorded signal is optically read from a disk on which a digitized audio signal is recorded together with address data and control data, and based on the reproduced digital signal obtained thereby, a reproduced analog audio signal is generated. This is an optical disc player that obtains a signal reading section 1, a signal transmission section 20, a signal processing circuit section 30, a control circuit section 40, and an operation section 50.
It is configured with. Although not shown, the signal reading section 1 is equipped with an automatic disk exchange mechanism, and therefore, in combination with the automatic disk exchange mechanism, this example has an automatic disk exchange function. There is.

Next, to explain each part, the automatic disk exchange mechanism part is where the digitized audio signal is
A disk storage is provided that stores a plurality of disks recorded in a pit arrangement along with address data, control data, etc., and a selected disk from among the plurality of disks in the disk storage is taken out and a signal is sent. It is attached to the disk mounting section 3 in the reading section 1, and the disk mounting section 3
It is constructed with a disk attachment/detachment mechanism that removes the disk attached to the disk attachment part 3 from the disk attachment part 3 and returns it to the disk storage.

The signal reading section 1 optically reads recorded signals from a disk 2 mounted on a disk mounting section 3 by an automatic disk exchange mechanism section to obtain a reproduced digital signal including a digitized audio signal. For example, when this disk player is installed in a car, it is installed together with the automatic disk exchange mechanism in a relatively large space inside the car, such as a trunk room or a rear seat.

In the signal reading section 1, the disk 2 mounted on the disk mounting section 3 is rotated by a disk rotation motor 4, and an optical sensor is used to read signals recorded from the rotated disk 2. A pick-up 5 is provided. The optical pickup 5 makes a reading laser beam incident on the disk 2 and detects the reflected laser beam modulated by an array of pits formed on the disk 2 according to the recorded signal. A reproduction digital signal S _r is obtained at its first output terminal, a focus error signal S f is obtained at its second output terminal, and a focus error signal S _f is obtained at its second output terminal. A tracking error signal S _t is obtained at the third output. These first, second, and third output terminals are connected to input terminals of an amplifier circuit 6, a focus control circuit 7, and a tracking control circuit 8, respectively.

The output end of the focus control circuit 7 is connected to the first control end of the optical pick-up 5, and the output end of the tracking control circuit 8 is connected to the second control end of the optical pick-up 5. It is connected to one input end of the control circuit 9. The output end of this pick-up feed control circuit 9 is connected to the third control end of the optical pick-up 5.

Further, a demodulation circuit 10 is provided, one output end of which is connected to the other input end of the pick-up feed control circuit 9, and the other output end connected to the control end of the disk rotation motor 4. .

The signal transmission section 20 is responsible for signal transmission between the signal reading section 1 and the signal processing circuit section 30 and the control circuit section 40, and transmits signals from the signal reading section 1 to the signal processing circuit section 30. Therefore, the transmitting section 2
1 and a receiving section 22 are provided, and the output end of the transmitting section 21 and the input end of the receiving section 22 are connected to an optical fiber 23.
connected via. The output end of the amplifier circuit 6 is connected to the input end of the transmitting section 21, and the output end of the receiving section 22 is connected to the signal processing circuit section 30, which will be described later.
The input terminal of the clock extraction/bit extraction circuit 31 is connected to the input terminal of the clock extraction/bit extraction circuit 31. In addition, in order to transmit signals from the control circuit section 40 to the signal reading section 1, the transmitting section 2
4 and a receiving section 25 are provided, and the output end of the transmitting section 24 and the input end of the receiving section 25 are connected to an optical fiber 26.
connected via. A modulation circuit 4 of a control circuit section 40, which will be described later, is connected to the input terminal of the transmitting section 24.
The output terminal of the receiving section 25 is connected to the input terminal of the demodulation circuit 10.

The signal processing circuit section 30 is configured to process the reproduced digital signal S _r from the signal reading section 1 to obtain a reproduced analog audio signal, and to supply various signals to the control circuit section 40 .
Further, the control circuit section 40 is configured to receive various signals from the signal processing circuit section 30 and the operation section 50 and generate control signals for the signal reading section 1 . The signal processing circuit section 30 and the control circuit section 40 connected thereto are installed separately from the signal reading section 1, and for example, when installed in a car, the front dashboard section, etc. will be distributed.

The signal processing circuit section 30 is provided with a clock extraction/bit extraction circuit 31 whose input terminal is connected to the output terminal of the receiving section 22 of the signal transmission section 20, and one output terminal of which is connected to the demodulation circuit 32. The other output terminal is connected to the second input terminal of the demodulation circuit 32 and the first input terminal of the motor rotation control circuit 41 in the control circuit section 40 . The first output terminal of the demodulation circuit 32 is connected to the first input terminal of the data control circuit 33, and the second and third output terminals thereof are connected to the motor rotation control in the control circuit section 40, respectively. The second circuit 41
and one input end of the system control unit 43. Data control circuit 33
Of the four output terminals, the first output terminal is connected to the input terminal of the error correction circuit 34, the second output terminal is connected to the input terminal of the memory circuit 35, and the third output terminal is connected to the input terminal of the memory circuit 35. It is connected to the third input terminal of the circuit 41, and the fourth output terminal is connected to the left/right separation circuit 3.
It is connected to the input terminal of 6. Further, the second and third input terminals of the data control circuit 33 are connected to an output terminal of an error correction circuit 34 and an output terminal of a memory circuit 35, respectively. One output end of the left/right separation circuit 36 is a digital signal for the stereo right signal.
It is connected to an input end of an analog conversion circuit 37, and the other output end is connected to an input end of a digital-to-analog conversion circuit 38 for stereo left signals.

Furthermore, the output terminal of the system control section 43 in the control circuit section 40 is connected to one input terminal of a modulation circuit 42, and the output terminal of the motor rotation control circuit 41 is connected to the other input terminal of this modulation circuit 42. is connected. The output end of the modulation circuit 42 is connected to the input end of the transmitting section 24 of the signal transmitting section 20.

The operation unit 50 is configured to perform operations for selectively causing the signal reading unit 1 to perform various operations such as a normal playback operation and a search operation, and is configured to operate, for example, to cause the signal reading unit 1 to selectively perform various operations such as a normal reproduction operation and a search operation. It is installed at the same location as the circuit section 40. The output terminal thereof is connected to the other input terminal of the system control section 43 in the control circuit section 40.

In an example of the disk player according to the present invention configured as described above, the automatic disk exchange mechanism section selects a disk from among a plurality of disks in the disk storage and attaches it to the disk mounting section 3. The disk 2 is connected to the disk rotation motor 4.
The signal is read by the optical pickup 5. A reproduced digital signal S _r is obtained from the optical pickup 5 and supplied to the amplifier circuit 6 . At this time, the optical pickup 5 is controlled by a focus control circuit 7, a tracking control circuit 8, and a pickup feed control circuit 9 to maintain a proper signal reading state.

The reproduced digital signal S _r supplied to the amplifier circuit 6
is amplified to a predetermined level, and then sent to the signal transmission section 2.
The signal is supplied to the transmitter 21 of No. 0, and is converted from an electrical signal to an optical signal in the transmitter 21. Then, the reproduced digital signal S _r converted into an optical signal is transmitted through the optical fiber 23 to the receiving section 22 installed on the signal processing circuit section 30 side. in this way,
Since the signal transmission from the signal reading section 1 to the signal processing circuit section 30 is performed by digital signal transmission using the optical fiber 23, the adverse effects of external noise such as engine noise received during signal transmission are considered to be extremely small. Ru. Furthermore, even if the signal is affected by external noise, the transmitted signal, i.e.
Since the reproduced digital signal S _r is a digital signal, the adverse effects of external noise can be easily removed.

In the receiving section 22, the reproduced digital signal _Sr , which has been made into an optical signal, is again converted into an electrical signal, further waveform-shaped, and then supplied to the clock extraction/bit extraction circuit 31 of the signal processing circuit section 30. be done. Digital data based on the reproduced digital signal S _r is obtained from one output terminal of the clock extraction/bit extraction circuit 31 and is supplied to the demodulation circuit 32 from its first input terminal. Also, a recovered clock pulse is obtained from the other output terminal of the clock extraction/bit extraction circuit 31 and supplied to the second input terminal of the demodulation circuit 32. And demodulation circuit 32
At this point, the digital data is demodulated,
Audio data is obtained from its first output and is supplied to a data control circuit 33.
In this data control circuit 33, error correction and correction of audio data is performed in cooperation with an error correction circuit 34 and a memory circuit 35.
Since error correction and correction of the audio data is performed in this way, for example, external noise may be mixed in during transmission of the reproduced digital signal S _r from the signal reading section 1 to the signal processing circuit section 30 through the optical fiber 23. As a result, even if an error occurs in the audio data, appropriate processing is performed here to remove the adverse effects of external noise.

The audio data on which error correction and correction have been performed is supplied from the fourth output end of the data control circuit 33 to the left/right separation circuit 36, where it is separated into right audio data and left audio data.
The signals are supplied to a digital-to-analog conversion circuit 37 and a digital-to-analog conversion circuit 38, respectively.
In the digital-to-analog conversion circuits 37 and 38, the right and left audio data are converted, respectively, and a reproduced analog right audio signal O _r and a reproduced analog left audio signal O _l are obtained from their output ends.

On the other hand, the motor rotation control circuit 4 of the control circuit section 40
1, the reproduced clock pulse from the other output terminal of the clock extraction/bit extraction circuit 31 is inputted from the first input terminal to the demodulation circuit 32 from the second input terminal.
The frame synchronization signal from the second output terminal of the data control circuit 33 is also transmitted from the third input terminal to the third
The master clock pulse from the output terminal of
Supplied. As a result, a rotation control signal for controlling the rotation of the disk rotation motor 4 of the signal reading section 1 and therefore the rotation of the disk 2 is obtained at its output terminal, and is supplied to the other input terminal of the modulation circuit 42. Ru.

For example, an operation is performed on the operation section 50 to set the reading position of the optical pickup 5 on the disk 2 to a desired position on the disk 2 where specific address data is recorded. When a predetermined command signal is supplied from the other input terminal to the system control section 43, the address specified by the command signal is input to the system control section 43 from the third output terminal of the demodulation circuit 32. The playback address data supplied to one input terminal is compared with the indicated address, and a pick-up feed control signal corresponding to the comparison result is obtained and supplied to one input terminal of the modulation circuit 42.

A digital signal modulated by the two types of control signals is obtained from the modulation circuit 42 to which two types of control signals, a rotation control signal and a pickup feed control signal, are supplied, and the digital signal is transmitted by the signal transmission unit 20. 24. This modulated digital signal is converted from an electrical signal to an optical signal in the transmitting section 24, and is transmitted through the optical fiber 26 to the receiving section 25 installed on the signal reading section 1 side. Even in this case, the adverse effects of external noise such as engine noise during signal transmission are considered to be extremely small. Then, in the receiving section 25, the digital signal converted from the optical signal to an electrical signal is demodulated by the demodulation circuit 10, and from the demodulation circuit 10, a rotation control signal and a pickup feed control signal are separated and obtained. . This rotation control signal is supplied to the control end of the disk rotation motor 4, and the pick-up feed control signal is supplied to the pick-up feed control circuit 9. This results in
The rotation of the disk rotation motor 4 is controlled based on a rotation control signal, and the disk rotation motor 4 is brought into an appropriate rotational state for rotating the disk 2 at a predetermined number of rotations. Also,
The optical pickup 5 is controlled so that its reading position is placed at a designated address position on the disk 2 based on a pickup feed control signal.

Note that the example explained above is based on an optical disk.
However, the disc player according to the present invention is not limited to an optical type, and may be a disc player of other types that read information signals from a disc by means other than optical means. Of course, it is also possible to use a disc player that regenerates information signals from a disc on which information signals other than audio signals are recorded.

Effects of the Invention As is clear from the above explanation, in the disk player according to the present invention, the signal processing circuit section can be separated from the signal reading section and can be placed in a position where it can be shared with other equipment installed separately. Therefore, by sharing the signal processing circuit section with other equipment, the overall configuration including the other equipment can be simplified. Moreover, since signal transmission between the separated signal reading section and the signal processing circuit section, and further signal transmission between the signal reading section and the signal reading section, is performed by digital signal transmission using optical fiber, the signal reading section The adverse effects of external noise on the signal transmission path between the signal processing circuit section and the signal processing circuit section and the control circuit section are extremely small.

For this reason, the disk player according to the present invention has its signal reading section, which is equipped with an automatic disk exchange mechanism section, installed in a relatively large interior space such as the trunk of a car, thereby saving a large amount of space. It is suitable for use as an in-vehicle disc player equipped with an automatic disc exchange function by attaching the signal processing circuit unit, control circuit unit, and operation unit to the front dash board, etc., and in such a case, The signal processing circuit section can be shared with other equipment such as a disk player or tape recorder that does not have an automatic disk exchange function and is installed in a front dashboard section or the like.

[Brief explanation of drawings]

The figure is a block connection diagram showing an example of a disk player according to the present invention. In the figure, 1 is a signal reading section, 2 is a disk, 5 is an optical pickup, 20 is a signal transmission section, 23 and 26 are optical fibers, 30 is a signal processing circuit section, 4
0 is a control circuit section, and 50 is an operation section.

Claims (1)

[Scope of utility model registration request] a signal reading unit that reads the information signal from a disk on which the digitized information signal is recorded to obtain a reproduced digital information signal; a signal processing circuit unit that processes the reproduced digital information signal to obtain a reproduced analog information signal; a control circuit unit connected to the signal processing circuit unit and an operation unit for performing an operation for causing the signal reading unit to perform a predetermined operation, and generating a control signal for the signal reading unit; The reading section, the signal processing circuit section, and the control circuit section are installed separately, and the signal transmission between the signal reading section, the signal processing circuit section, and the control circuit section is performed using an optical fiber. A disc player operated by digital signal transmission.