JPH03204022A - Data reproducing device - Google Patents

Abstract

PURPOSE:To read out data at high speed by providing a control part to fetch data when these data are discriminated as the necessary after decoding data, and transmitting the absolute position information recorded through the control part to a recording/reproducing part. CONSTITUTION:The address data are produced by an address generating circuit 16 with an instruction of a CPU 15 and turned into the subcode data by a subcode encoder 17. This subcode data is sent to a CD recording/reproducing device 1. When the address data is supplied to the device 1, a pickup is moved to the address that is pointed based on the address information. Thus the corresponding area is reproduced. When the pointed address area is reproduced, the reproduced digital data is outputted via an output terminal 4 and supplied to a CD ROM controller 10. A subcode detecting circuit 13 of the controller 10 detects a subcode. Then the controller 10 checks the pointed address and at the same time carries out the parity check. It is discriminated whether the address of the detected reproduced area is coincident with the recording address of the necessary data or not. In such constitution, the necessary data can be immediately obtained.

Description

[Detailed description of the invention] The present invention will be explained in the following order.

A. Field of industrial application B. Overview of the invention C. Prior art D. Problem to be solved by the invention E. Means for solving the problem F. Effect G. Example G1. Structure of the example Gz - Operation of the example H. Effect A: Industrial Application Field The present invention relates to a data reproducing device suitable for application to, for example, a CD (compact disc) recording/reproducing device for recording and reproducing digital audio signals.

B. Summary of the Invention The present invention is a data reproducing apparatus suitable for application to a digital data recording/reproducing apparatus such as a CD recording/reproducing apparatus, in which the reproduction state is controlled by a digital signal from a predetermined control section and the data is reproduced. When digital data is decoded and determined to be necessary data, this data is taken in, so that various data reproducing devices such as CD recording and reproducing devices can be used as a reproducing device for computer program data, etc. It is.

C. Prior Art Conventionally, a device called a CD ROM device has been developed as a device for reproducing digital data such as program data for a computer. This CD ROM device is a compact disc (CD) that records digital audio signals.
Various digital data such as program data is recorded on a disk of the same standard as the read-only memory (ROM).
, ), and is configured as a data reproducing device by a disk-shaped CDROM storing predetermined data and a disk drive device. According to this CD ROM device, a very large amount of data can be stored.

On the other hand, in recent years, CD recording and reproducing apparatuses have been developed that are capable of not only reproducing digital audio signals from compact discs, but also recording digital data such as digital audio signals.

D. Problem to be solved by the invention However, the disk drive device constituting the CD ROM device requires a dedicated device separate from the CD playback device for reproducing digital audio signals, and in the case of a CD ROM device, this is not necessary. CD reproducing apparatuses for reproducing digital audio signals are generally expensive, whereas CD reproducing apparatuses for reproducing digital audio signals are relatively inexpensive.

The object of the present invention is to provide a CD for playing back digital audio signals.
The object of the present invention is to enable various playback devices such as players to be used as digital data playback devices such as computer program data.

E. Means for Solving the Problems The data reproducing device of the present invention has, for example, as shown in FIG.
A recording/reproducing section (1) records and reproduces digital data, outputs reproduced data as digital data, and controls the reproduction state by a signal supplied to a digital data input terminal (6); When the reproduction position information is transmitted to the reproduction section (1) via the digital data input terminal (6), and the digital data supplied from the recording/reproduction section (1) is decoded and determined to be necessary data. , and a control unit (10) that captures this data, and transmits absolute position information in which the necessary data is recorded from the control unit (10) to the recording/reproducing unit (1) to obtain the necessary data. This allows data to be played back.

F. Effect With this configuration, various recording/playback devices such as a CD recording/playback device for recording/playing digital audio signals whose playback status can be controlled by digital signals can be used.
It can be used as a digital data reproducing device for computer program data, etc. In this case, the absolute positional information where the necessary data is recorded is directly instructed to the recording/reproducing section by a digital signal, so that the necessary data is immediately reproduced.

G. Embodiment Hereinafter, an embodiment of the data reproducing apparatus of the present invention will be described with reference to the accompanying drawings.

Configuration of G1 Example In FIG. 1, (1) indicates a CD recording/playback device;
This CD recording/playback device (1) is for playing a CD on which digital audio signals are recorded and also for recording digital audio signals onto a disk. The reproduced digital audio signal is converted to an analog audio signal and outputted from the analog audio signal output terminal (3), and this C
D An audio signal is reproduced from a speaker of an audio device (not shown) connected to the recording/reproducing device (1).

Further, this CD recording/playback device (1) is equipped with a digital signal output terminal (4), and is configured to directly output a digital signal reproduced from a CD from this digital signal output terminal (4). For example, this digital signal Output terminal (4)
By connecting this to an audio device equipped with a digital signal input terminal, the audio signal is transmitted to the amplifier as a digital signal, minimizing deterioration in playback quality.

This CD recording/playback device (1) is equipped with an infrared signal receiving section (5), and is capable of performing various playback controls by receiving an infrared signal emitted from a remote commander (not shown).

This CD recording/playback device (1) is equipped with a digital signal input terminal (6).
) can be recorded on a predetermined recording disc. Also,
Information supplied to this digital signal input terminal (6) in a predetermined format allows this CD recording/playback device (1
) can be controlled in various ways. For example, by supplying address information converted into digital data from the outside to the digital signal input terminal (6), the address on the disc specified by this address information is reproduced. In this case, this address information is converted into data in a format similar to subcode data recorded on a CD and supplied to the digital signal input terminal (6).

In this example, this CD recording/playback device (1)
Connect the digital signal output terminal (4) of the CD ROM controller (10) to the CD recording/playback device (1) and the CD
A CD ROM drive device is constituted by the ROM control device (10).

This CD ROM control device (10) supplies the digital signal output from the digital signal output terminal (4) of the CD recording/playback device (1) to the serial/parallel converter (11), and performs this serial/parallel conversion. A device (11) converts the digital serial data reproduced from the disk into parallel data. The converted parallel data is then supplied to a descrambler circuit (12).

In the descramble circuit (12), the central control unit (1
5), the reproduced data is descrambled and the descrambled reproduced data is supplied to the subcode detection circuit (13) and the data memory (14). The subcode detection circuit (13) detects subcode information from the supplied reproduced data, and supplies the detected subcode information to a central control unit (15) having a microcomputer configuration. Furthermore, storage of reproduced data in the data memory (14) is controlled by a central controller (15), and the stored data is supplied to the central controller (15). An address generation circuit (16) is connected to the central control device (15), and the central control device (15)
This address generation circuit (16) generates a predetermined address signal under the control of. In this case, the address generation circuit (
16) is a circuit that converts address information into data in the same format as subcode data recorded on a CD.

The address signal generated by the address generation circuit (16) is then subjected to predetermined encoding by a subcode encoder (17), and the encoded digital signal is supplied to a mixer (18). Further, (19) in the figure indicates a recording digital data input terminal, and the digital data (digital audio signal, etc.) supplied to this recording digital data input terminal (19) is supplied to the mixer (18), and the subcode is The subcode data supplied from the encoder (17) and recording digital data are mixed. The output data of this mixer (18) is then transferred to a CD recording/playback device (
1) to the digital signal input terminal (6).

Then, the predetermined data read out from the CD recording/playback device (1) and stored in the data memory (14) of the CD ROM control device (10) is supplied to a predetermined data processing device (not shown); Performs various data processing.

With the above configuration, a CD with necessary data stored in the disc mounting section (2) of the CD recording/playback device (1)
By installing the ROM, the CD recording/reproducing device (1) and the CD ROM control device (10) function as a CD ROM drive device.

Operation of the G2 Embodiment Below, the operation when used as a CD ROM drive device will be explained.

First, to explain the data recording state of CD ROM, CD ROM has a very large data recording capacity, so multiple pieces of data are recorded, and each data is recorded in the same way as digital audio in the area corresponding to the digital audio data recording area of the CD. Recorded in block configuration. That is, FIG. 3 shows an example of the recording format of a CD ROM. Data is recorded divided into a plurality of broncs, and 75 blocks are formed in a recording track for one second. One second in this case corresponds to one second of recording trunk length when digital audio is recorded as data. Each block consists of 2352 bytes, and each block consists of 2352 bytes.
The first 12 bytes of the link are used as a synchronization signal, and the next 4 bytes are used as a synchronization signal.
The address information of the recording sector (minute 1 second, sector) and recording mode information are recorded in this header. The next 2048 hides are used as an arbitrary data recording area, the 4 hides following this data recording area are used as an error detection code, the next 8 bytes are used as a space, and the last 4 bytes are used for error correction. It is considered to be a sign. It should be noted that data other than the synchronization signal of each program is scrambled in a predetermined manner and recorded. The first predetermined hider including the header is used as a subcode, and address information included in this subcode enables cueing, which will be described later. The address information included in this subcode is configured in the same way as in the case of a CD on which digital audio is recorded as data.

Next, refer to the flowchart in Figure 2 and proceed as follows:
To explain the operation when reading data recorded in a D ROM, first, the recording address information of each data is
The data is recorded on a predetermined track of the OM or on another floppy disk, and the central control unit (15) that controls the readout of the CD ROM judges this data recording address information and instructs the address of the required data. and read out the required data. That is, CD ROM
When the central control device (15) of the control device (10) needs to read predetermined data from the C0ROM mounted on the CD recording/playback device (1), first, as shown in the flowchart of FIG. The address (minute 1 second, sector) where this data is recorded is determined.

Once this recording address can be determined, the central control unit (1
In response to the instruction 5), the data of this determined address is created in the address generation circuit (16). Then, the created address data is encoded by the subcode encoder (17) to become subcode data, and then sent to the CD recording/playback device (1) via the digital signal input terminal (6).
to be transmitted.

When this address data is supplied to the CD recording/playback device (1), the control section of the CD recording/playback device (1) controls the specified address ( Minutes.

Move the optical pickup to seconds (sectors) and play the corresponding part. That is, the CD ROM controller (10
) is reproduced where a subcode that provides the same address information as that supplied from the subcode is recorded.

When the specified address is played back in this way, all the playback digital data is transferred to the CD recording/playback device (1
) is output from the digital signal output terminal (4) of the CD
Reproduction digital data is supplied to the ROM control device (10). Here, in this CD ROM control device (10), the subcode detection circuit (13) detects subcode information from the reproduced digital data, and the detected subcode information is supplied to the central control device (15), and the subcode information is detected from the reproduced digital data. Check the address of the playback location from the address information included in the information. At the same time, a parity check is also performed. Then, it is determined whether the address of the detected reproduction location is the recording address (sector) of the required data.

When the address of the sector in which the required data is recorded is detected, the reproduction data at this time is transferred to the descrambler circuit (12) under the control of the central control unit (15).
) is descrambled and read into the data memory (I4). Then, the header of the read data is checked, and when it is confirmed, it is determined that the data has been read correctly, and the data is sent to a predetermined data processing device (not shown) under the control of the central control device (15). A predetermined operation is performed based on the read data. When the data has been correctly read, data instructing the CD recording/playback device (1) to stop the playback operation is transmitted via the digital signal input terminal (6) to stop the playback operation. Further, if the header of the read data cannot be confirmed, it is determined that the data could not be read correctly, and the process is started again from the address instruction by sending the address information. If data cannot be read correctly even after performing this control multiple times, a message indicating that an abnormality has occurred is displayed.

As described above, according to this example, a CD recording/playback device (1) for recording/playing digital audio signals is used to record a CD.
Data can be read from ROM. In this case, CD recording/
Control information for searching the required data recording area is supplied to the CD recording/playback device (1) via the digital signal input terminal (6) provided in the playback device (1).
There is no need for a special search function for reading data, and various CD recording and reproducing devices can be used as a disk drive device for a CD ROM device.

Although the above embodiment uses a CD ROM device, the present invention can also be applied to a ROM device using the digital audio signal recording area of a video disc. In this case, instead of the CD recording/playing device, a video disc recording/playing device equipped with a digital audio signal input terminal and an output terminal may be connected to the CD ROM control device (10). Furthermore, other digital signal recording/reproducing devices such as a digital audio tape recorder may be used.

Furthermore, it goes without saying that the present invention is not limited to the above-mentioned embodiments, and can take various other configurations.

Effects of the invention According to the invention, a CD for playing digital audio signals
Various reproducing devices such as recording/reproducing devices can be used as devices for reproducing digital data such as computer program data, and the digital data reproducing device can be constructed using existing devices. In this case, by transmitting the absolute position information in which the required data is recorded as digital data and reproducing the necessary data, the required data can be obtained immediately, and a dedicated digital data reproduction It can read data at a high speed comparable to other devices.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the data reproducing apparatus of the present invention, FIG. 2 is a flowchart for explaining the embodiment, and FIG. 3 is a route map showing an example of data in the embodiment. (]) is a CD recording/playback device, (4) is a digital signal output terminal, (6) is a digital signal input terminal, (10) is a C
D ROM control device, (15) is the central control device, (16
) is an address generation circuit, (17) is a subcode encoder, and (19) is a recording digital data input terminal. ICD recording/reproduction device

Claims (1)

[Claims] A recording/reproducing unit that records and reproduces digital data, outputs reproduced data as digital data, and controls the reproduction state by a signal supplied to a digital data input terminal; a control unit that transmits playback position information to the playback unit via the digital data input terminal, and also decodes the digital data supplied from the recording/playback unit and captures this data when it is determined that the data is necessary; A data reproducing device comprising: transmitting absolute positional information in which necessary data is recorded from the control section to the recording/reproducing section to reproduce the necessary data.