JP3064564B2 - Digital data 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 digital data reproducing apparatus for reproducing digital data such as information data and audio signals from a disk-shaped information recording medium.

[0002]

2. Description of the Related Art An optical disk device as a conventional digital data reproducing device will be described with reference to FIG. In the figure, digital data such as digital information data and digital audio signals are recorded on a compact disk 1 as a record carrier. The compact disk 1 is rotated by a spindle motor 2 and is The data is played.
Since the reproduced signal from the optical pickup 3 has an analog waveform, it is waveform-shaped by the waveform shaping circuit 4 to be binarized, and then supplied to the signal processing circuit 5.

In the signal processing circuit 5, a clock and digital data are reproduced from the supplied binary signal, and the digital data is subjected to demodulation, error detection and correction processing, and digital information data A or digital audio signal. Output as B. The digital audio signal B
Is converted into an analog signal by a D / A (digital / analog) conversion circuit 6, passes through a low-pass filter 7, is level-adjusted by a volume control volume 8, and
2 and is output as an analog audio signal C.

On the other hand, a CPU 11 controls a servo circuit 9 based on a control signal D from a host computer (not shown).
And the signal processing circuit 5. This servo circuit 9
Under the control of the PU 11, the spindle motor 2 is rotationally controlled to rotate the compact disc 1, and the optical pickup 3 is controlled in accordance with the output signal of the signal processing circuit 5 to perform tracking adjustment, focus adjustment, and the like. The optical pickup 3 is moved in the radial direction of the compact disc 1 by controlling the slide motor 10.

FIG. 10 shows such a conventional optical disk drive as C
FIG. 2 is a block diagram showing a conventional example of an optical disk system used as a D-ROM. In this figure, in this system, a host computer 13 is connected to a plurality of optical disk devices 14, 15, 16 as CD-ROMs, and can take in digital information data A from any of these optical disk devices. . The digital data information data A is arbitrary information data including audio data subjected to compression processing. Host computer 13
And each of the optical disk devices 14, 15, 16 are connected by a data bus and a signal line. Digital information data A is sent to the host computer 13 via the data bus, and a control signal D is transmitted via the signal line. Each optical disk device 1
4, 15 and 16. As described above, the digital audio signals B1, B
2, B3 and analog audio signals C1, C2, C3 are output.

[0006]

As described above, the conventional optical disk apparatus has external output terminals for digital audio signals and analog audio signals, respectively. However, in the optical disk system as shown in FIG. In order to obtain a reproduced audio signal of each optical disk device and listen to the audio, it is necessary to connect a headphone, an amplifier, or a speaker to at least an external output terminal of the disk reproducing device from which the audio is to be listened. Therefore, in order to be able to listen to audio from all optical disk devices using amplifiers and speakers, amplifiers and speakers must be attached to all of these optical disk devices, and audio signals are sequentially reproduced from these optical disk devices in order. While this would be effective, the system itself would be very large and expensive.

There is also a method in which a set of amplifiers, speakers or one earphone is used and the optical disk reproducing apparatus for reproducing the same is changed every time the optical disk reproducing apparatus is changed. This method is generally used. Every time the playback device is replaced, an operation of replacing the amplifier or earphone with a disk device to be played next is required, which is troublesome and has a problem in usability. Moreover, the playback is interrupted while the amplifier or the earphone is replaced with the disk device to be played next.

Further, since the optical disk apparatus is provided with two output terminals, a digital audio signal output terminal and an analog audio signal output terminal, when replacing an amplifier or an earphone, it is necessary to determine which terminal is best. It is necessary to select the wrong terminal. From this point, there was a problem in usability.

An object of the present invention is to provide a digital data reproducing apparatus which solves such a problem, prevents the system from being enlarged and increased in cost when configuring the system, and enhances usability. It is in.

[0010]

In order to achieve the above object, the present invention provides a method for outputting a reproduced digital audio signal to an external device.
Or digital sound input from outside
Input / output terminals and the reproduced digital audio signal or
Digital input from outside via audio input / output terminal
Audio output that outputs an analog audio signal converted from an audio signal
Input terminal and the audio input / output terminal
Audio signal output and external digital audio signal input
Means for switching between digital data and
When digital playback devices are connected to each other,
Even if a digital audio signal is reproduced by a data reproduction device,
Analog audio signals from a number of digital data
No. is output.

[0011]

Both the audio signal reproduced by itself and the external audio signal are processed by the signal processing means and output from the common audio output terminal . Therefore, when a system is constructed using the present invention, any digital data reproducing apparatus can output audio signals from all the apparatuses constituting this system. You can listen to audio from all devices just by attaching earphones.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of a digital data reproducing apparatus according to the present invention as an optical disk apparatus. Reference numeral 17 denotes a three-state buffer, and parts corresponding to those in FIG. Omitted.

In FIG. 1, a three-state buffer 17 is connected to the output terminal of the signal processing circuit 5, and the digital audio signal output from the signal processing circuit 5
Output to the outside through the state buffer 17;
It is supplied to the D / A conversion circuit 6. The three-state buffer 17 is controlled by the CPU 11 and converts the audio signal reproduced from the compact disc 1 into a digital audio signal B.
Or when outputting as an analog signal C, the three-state buffer 17 is set to the output state. When outputting digital information data A other than the audio signal reproduced from the compact disc 1, the three-state buffer 17 is set to a non-output state. Further, by providing the three-state buffer 17 in this manner and making it non-output state, the external output terminal of the digital audio signal B can be used as the input terminal of the external digital audio signal. Therefore, a digital audio signal input from the outside can be processed by the D / A conversion circuit 6, the low-pass filter 7, the volume control volume 8, and the output amplifier 12, and can be output to the outside as an analog audio signal C.

By controlling the output of the three-state buffer 17 so that the three-state buffer 17 is in the output state only when the compact disk 1 is in the reproducing state, a special command is issued from a host computer (not shown). The 3-state buffer 17 can be automatically controlled without sending.

FIG. 2 is a block diagram showing the configuration of an optical disk system using a plurality of digital data reproducing devices shown in FIG. 1 as CD-ROMs. In the figure, a host computer 13 is connected to a plurality of optical disk devices 18, 19 and 20 described in FIG. 1 by data buses and signal lines, similarly to the conventional optical disk system shown in FIG. , Digital information data A from an arbitrary optical disk device is sent to the host computer 13, and a control signal D is sent from the host computer 17 to the optical disk devices 18, 19, 20 via a signal line.

On the other hand, each of the optical disk devices 18, 19, 20
Can output the digital audio signal B and the analog audio signals C1, C2, and C3 as described above. The output terminal of the digital signal B is also an input terminal of an external digital audio signal, Optical disk device 18, 1
These digital audio signal input / output terminals can be connected to each other between 9, 20. In the optical disk system shown in FIG.
The digital audio signal input / output terminals 9 and 20 are connected to each other, so that the digital audio signal B output from a certain optical disk device is supplied to another optical disk device. In this case, under the control of the host computer 13, the optical disk devices 18, 1
In any one of 9 and 20, the reproduction state is one of these, and in the other two, the three-state buffer 17 is used.
(FIG. 1) is set to the non-output state. That is, the host computer 13 uses the control signal D to
One of 8, 19, and 20 is set to the reproduction mode, and the other is not set to the reproduction mode. In the optical disk device in the reproduction mode, the CPU 11 (FIG. 1)
Only in the case of the reproduction of the optical disk device, the three-state buffer 17 is set to the output state, and in the optical disk device which is not set to the other reproduction mode,
The CPU 11 sets the three-state buffer 17 to the non-output state.

Therefore, assuming that the optical disk device 18 reproduces the digital audio signal B from the compact disk, the other optical disk devices 19 and 20 set the three-state buffer 17 to a non-output state. At this time, a digital audio signal B and an analog audio signal C1 are output from the optical disk device 18 by reproduction, and the digital audio signal B is
20 and are processed as described above and output as analog audio signals C2 and C3, respectively. In other words, the same analog audio signal reproduced from the compact disc of the optical disk device 18 is simultaneously output from these three optical disk devices 18, 19, and 20.

As described above, in such an optical disk system, the digital audio signal B
The same analog audio signal is output from any of the optical disk devices even if it is played back. Therefore, simply connecting a headset, an amplifier, a speaker, etc. to any one of the optical disk devices allows any of the optical disk devices to convert a compact disk. Even when reproduced, the reproduced analog audio signal can be obtained. Therefore, unlike the related art, it is not necessary to connect a headphone, an amplifier, a speaker, and the like for each optical disk device.

Although FIG. 2 shows an example in which the number of optical disk devices is three, the number of optical disk devices may be any, and the number is not particularly limited.

FIG. 3 is a block diagram showing another embodiment of the digital data reproducing apparatus according to the present invention. The parts corresponding to those in FIG. This embodiment is different from the embodiment shown in FIG. 1 only in the control method of the three-state buffer 17.

In FIG. 3, the three-state buffer 17 is controlled by a control signal D from the host computer 13 (FIG. 2). When such an optical disk device is used in the optical disk system shown in FIG. 2, the host computer 13 sets the optical disk device 1 irrespective of whether the optical disk devices 18, 19, 20 are in the reproduction state or not.
Controls the three-state buffer 17 at 8, 19 and 20. However, the three-state buffer 17 is in an output state only in one of the optical disk devices 18, 19, and 20, and the three-state buffer 17 of two or more optical disk devices is output.
Are not output at the same time.

According to this, the optical disk devices 18, 1
Even if two or more of the audio signals 9 and 20 are in the audio reproduction state at the same time, any one of the analog audio signals is selected and output from all of the optical disk devices 18, 19 and 20, and The output analog audio signals of a plurality of optical disk devices reproducing signals can be instantaneously switched. Therefore, for example, in the case where audio signals are successively reproduced from a plurality of compact discs,
Especially effective.

FIG. 4 is a block diagram showing still another embodiment of the digital data reproducing apparatus according to the present invention. The same reference numerals are given to the portions corresponding to FIG. 1 and FIG. This embodiment uses a three-state buffer 1
7 is different from the embodiment shown in FIGS. 1 and 3 only.

In FIG. 4, the three-state buffer 17 is controlled by a control signal D 'from an external device other than the host computer such as an optical disk control device. When the optical disk device according to the optical disk system shown in FIG. 2 is used, regardless of whether the optical disk device is in the reproduction state, the input / output of the audio signal is forcibly controlled by the external device. Can be.

FIG. 5 is a block diagram showing still another embodiment of the digital data reproducing apparatus according to the present invention.
Reference numeral 1 denotes a changeover switch, and portions corresponding to the above-described drawings are denoted by the same reference numerals, and redundant description will be omitted.

In the figure, in the embodiment described above,
Using a three-state buffer, the
Although the digital audio signal can be input, a changeover switch 21 is provided between the low-pass filter 7 and the volume control 8 instead of the three-state buffer. 7 are b, c, d
The terminal receives an analog audio signal C1 from another optical disk device or an external device such as a radio receiver or a tape recorder.
', C2' and C3 'are supplied respectively. The switching switch 21 is controlled by the CPU 11, selects one of these analog audio signals, and supplies the selected analog audio signal to the volume control volume 8.

When the optical disk apparatus according to the optical disk system shown in FIG. 2 is used, a device for outputting an audio signal such as a radio receiver or a tape recorder is also used in the optical disk system, and the analog audio signal from these devices is also used. It can be obtained from one optical disk device, and the function of the optical disk system is further expanded. Here, in FIG. 5, the analog audio signal C ′ output from the low-pass filter 7 is configured to be output to the outside,
This is the same changeover switch 2 in other optical disc devices.
It is supplied to any one of the terminals b, c, and d. That is, assuming that the analog audio signal C1 'supplied to the terminal b of the changeover switch 21 in FIG. 5 is from another optical disk device, the analog audio signal C1' is a low-pass filter in the other optical disk device. It is output from.

In this embodiment, when the mode for reproducing the audio signal from the compact disc 1 is set, the CPU 11 automatically closes the changeover switch 21 to the terminal a without receiving a special command from the host computer. .

Instead of controlling the changeover switch 21 by the CPU 11, the changeover switch 21 may be controlled by a control signal D from a host computer as shown in FIG. In this case, the host computer can control the changeover switch 21 irrespective of whether or not each of the optical disk devices is in the reproducing state. Therefore, the plurality of optical disk devices are in the reproducing state of the audio signal at the same time. At this time, it is possible to select a reproduction audio signal of an arbitrary optical disk device. FIG. 7 is a block diagram showing still another embodiment of the digital data reproducing apparatus according to the present invention, in which the selection can be switched instantaneously. Reference numeral 22 denotes an adder, and a portion corresponding to FIG. The reference numerals are given and duplicate description is omitted. In this embodiment, an adder 22 is used instead of the changeover switch 21 in the embodiment shown in FIG.

In the figure, the analog audio signal C 'output from the low-pass filter 7 and the analog audio signals C1', C2 ', C3' from the external device as described above are supplied via an adder 22 to a volume control volume 8 respectively. Supplied to FIG.
When an optical disk device or an external device according to the optical disk system shown in FIG. 1 is used, only one of these devices can be set to the reproduction state. In this case, the adder 22 outputs the analog audio signal C ', C1', C2 ', C
3 'is input and output as an analog signal C. Further, if necessary, two or more devices can be simultaneously set in a reproduction state. In this case, audio signals from those devices can be mixed and output.

In the embodiment described above, audio signals are input from three external devices. However, the present invention is not limited to this, and it goes without saying that the number of input audio signals is arbitrary. Therefore, the number of optical disk devices in the optical disk system shown in FIG. 2 may be one, two, or three or more.

FIG. 8 is a block diagram showing another specific example of an optical disk system to which the above embodiments can be used. Reference numeral 23 denotes an arithmetic unit, and parts corresponding to those in FIG. And a duplicate description will be omitted. In the figure, this specific example is composed of a host computer 13, an optical disk device 18 shown in FIG. The arithmetic unit 23 is connected to the optical disk device by a data bus of digital information data,
Further, it is connected to the host computer 13 via a signal line, and expands digital audio data that has been subjected to arithmetic compression processing and the like.

Therefore, the optical disk device 21 also outputs the compressed digital audio data as digital information data A, but the digital information data A output from the optical disk device 21 is transmitted via the data bus to the arithmetic unit 2.
3 under the control of a control signal D from the host computer 13.
And the digital audio data is separated and decompressed.

The arithmetic unit 23 can convert such digital audio data into serial data and output it as a digital audio signal. However, similarly to the optical disk device 18 shown in FIG. 1, the arithmetic unit 23 further includes a D / A converter and a volume control volume. By providing an output amplifier, such a digital audio signal can be output as an analog audio signal C〃 whose volume has been adjusted. The arithmetic unit 23 having such a configuration
Also, similarly to the optical disk device 18, the digital audio signal is received from the optical disk device 18 or another external device (arbitrary optical disk device, radio receiver, tape recorder, etc.) and converted into an analog audio signal C〃. Can be output as well.

As described above, in this specific example, the analog signal C〃 of the digital audio signal output from the optical disk device 18 or another external device is output from the optical disk device 18.
Can be obtained by the arithmetic unit 23. Further, not only the digital audio signal B output from the optical disk device 18 and other external devices but also the optical disk device 1
8 can also be obtained as an analog audio signal C #. In this case, the audio adjustment volumes of the optical disk device 18 and the arithmetic device 23 can be adjusted independently of each other. Therefore, for example, one of the analog audio signal output terminals of the optical disk device 18 and the arithmetic device 23 is connected to the headphone output. Terminals, and the other terminal can be used as an output terminal to an amplifier.

In this optical disk system, it is a matter of course that the embodiment shown in other than FIG. 1 may be used as the optical disk device 18. For example, when the optical disk device 18 is the embodiment shown in FIG. Arithmetic unit 2
By using a changeover switch similar to the changeover switch 21 in FIG. 5 for 3, it is possible to increase the number of external devices for inputting digital audio signals.

In the above embodiment, an optical disk apparatus for reproducing a compact disk as a digital data reproducing apparatus, that is, a CD-ROM driver has been described as an example, but a drive apparatus for reproducing a disk on which a digital audio signal is recorded. Any one may be used as long as it is not limited to a CD-ROM driver.

[0038]

As described above, according to the present invention,
Not only the digital audio signal reproduced by itself but also a digital audio signal output from another device can be taken in and output as an analog audio signal. As a result, when an audio system is configured by combining a plurality of digital data reproducing devices and other audio output devices according to the present invention, audio signals from all devices can be obtained from any of the digital data reproducing devices according to the present invention. It can be done with only one earphone, amplifier and speaker,
The number of components such as earphones, amplifiers, and speakers can be reduced, and even if any of the combined devices generates an audio signal, there is no need to replace earphones, amplifiers, and speakers, and the digital data reproducing apparatus according to the present invention can be used. By attaching earphones to each of them, the same sound can be heard at the same time by each, so that the usability becomes very good.

Further, according to the present invention, when a plurality of units are combined to constitute an audio system, and the same audio is simultaneously heard from each unit, the volume can be adjusted for each unit. It is possible to listen to the sound at the volume.

Further, according to the present invention, when an audio system is configured by combining a plurality of digital data reproducing apparatuses according to the present invention, when audio signals are obtained from any of the digital data reproducing apparatuses, the selection of the audio is performed by the host computer. It is possible to control automatically without sending a special command from the host computer, and it is also possible to perform control by a command from the host computer, thereby enabling fine selection control. In this case, it is also possible to listen to the audio signals reproduced from the respective digital data reproducing devices in sequence.

[Brief description of the drawings]

FIG. 1 is a block diagram showing one embodiment of a digital data reproducing apparatus according to the present invention.

FIG. 2 is a block diagram showing a specific example of an optical disk system using the digital data reproducing device according to the present invention.

FIG. 3 is a block diagram showing another embodiment of the digital data reproducing apparatus according to the present invention.

FIG. 4 is a block diagram showing still another embodiment of the digital data reproducing apparatus according to the present invention.

FIG. 5 is a block diagram showing still another embodiment of the digital data reproducing apparatus according to the present invention.

FIG. 6 is a block diagram showing still another embodiment of the digital data reproducing apparatus according to the present invention.

FIG. 7 is a block diagram showing still another embodiment of the digital data reproducing apparatus according to the present invention.

FIG. 8 is a block diagram showing another specific example of an optical disk system using the digital data reproducing device according to the present invention.

FIG. 9 is a block diagram showing an example of a conventional digital data reproducing apparatus.

FIG. 10 is a block diagram showing an example of an optical disk system using a conventional digital data reproducing device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Compact disk 2 Spindle motor 3 Optical pickup 4 Waveform shaping circuit 5 Signal processing circuit 6 D / A conversion circuit 7 Low-pass filter 8 Volume control volume 9 Servo circuit 10 Slide motor 11 CPU 12 Amplifier 13 Host computer 17 3 state buffer 18- Reference Signs List 20 output amplifier 21 changeover switch 22 adder 23 arithmetic unit A digital information data B digital audio signal C1, C2, C3, C1 ', C2', C3 ', C〃 analog audio signal D, D' control signal

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G11B 20/10 321

Claims (1)

(57) [Claims] 1. A digital data reproducing apparatus for reproducing digital data from a recording medium, wherein a reproduced digital audio signal is output to an external device , or
And the audio output terminal for receiving a digital audio signal from the digital audio signal reproduced or voice input and output terminals,
Converts externally input digital audio signals
An audio output terminal for outputting the reproduced analog audio signal, and an audio input / output terminal for outputting the reproduced digital audio signal.
Switch between the output and the input of the digital audio signal from outside.
And a plurality of digital data reproducing devices are connected to each other.
Which digital data playback device
Signals are reproduced, the digital data
A digital data reproducing device, wherein the same analog audio signal is output .