JPH07220410A - Disk reproducing device - Google Patents

Abstract

PURPOSE:To diversify a connectable digital equipment by making connection to various kinds of digital equipment easily by providing a digital interface circuit for outputting data read from a memory serially. CONSTITUTION:The title device is provided with a data dropout compensation circuit 7 and a CPU 9 for writing or reading digital audio signals output from a signal processing circuit 5 into a memory 8 and further is provided with a digital audio interface circuit 10. The digital audio interface circuit outputs, as it is, a digital audio signal read from the memory 8 at a normal speed or adding control data to the digital audio signal before outputting. By utilizing the circuit 7 and a CPU 9 and examining the data read from a disk 1 and operation conditions and setting conditions, control data such as source type, sampling frequency, and clock accuracy are obtained in addition to the digital audio signal.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc reproducing apparatus having a seismic resistance function when data is lost due to vibration and a function of correcting the loss of data when a disc is exchanged, and more particularly to a digital disc reproduced from a disc. It is configured to add control data to a signal and output the signal so that it can be connected to various digital audio equipment, digital video equipment, digital information equipment and the like.

[0002]

2. Description of the Related Art A conventional compact disc reproducing apparatus, as shown in FIG. 3, includes a spindle motor 3 for rotating a disc 1, an optical pickup 2 for reading data from the disc 1, and an output of the optical pickup 2. Amplifying head amplifier 4 and amplified optical pickup 2
A signal processing circuit 5 for processing the output of the optical pickup 2 to obtain an audio digital signal, and a servo processing circuit 6 for performing focusing and tracking of the optical pickup 2 and speed control of the spindle motor 3 based on the output of the head amplifier 4. And a drive circuit 11.

When such a compact disc reproducing device is mounted on an automobile or the like, the compact disc reproducing device is provided with a seismic function in order to prevent skipping due to vibration. As means for fulfilling this seismic resistance function, a data loss correction control circuit 7, a memory 8 and a CPU 9 for controlling the data loss correction control circuit 7 and the memory 8 are provided.

Disk 1 at a speed higher than the normal reproduction speed
Is rotated to write high-speed data read by the optical pickup 2 to the memory 8 at a high speed while the write address is managed by the CPU 9 and the data loss correction control circuit 7, while the read address is managed at the same time. The data older than 8 is read out sequentially, and D / A
It is used after being converted into an analog audio signal by the converter 12.

While writing data to the memory 8,
When the CPU 9 or the data loss correction control circuit 7 detects a data abnormality (sound skipping), the servo processing circuit 6
Is controlled to move the optical pickup 2, read the same data from the disk 1 again, and rewrite to the memory 8. Even during such rewriting, sufficient data is stored in the memory 8 in advance, so that reading of normal speed data is not hindered.

[0006]

DISCLOSURE OF THE INVENTION In a compact disc reproducing apparatus having such a conventional seismic function,
The signal output from the data loss correction control circuit 7 is as shown in FIG.
As shown in the timing chart in Figure 3, the clock signal (CK), the left and right switching signals (LR), and the left and right digital audio signals (A
L, AR) and no control data is added, connectable devices are limited to the D / A converter 12, and digital amplifiers and digital signal processing devices that require control data ( DSP), mini disk (MD), digital compact cassette (DC)
C), digital audio tape recorder (DA
T) and other digital devices could not be used for recording and playback.

Therefore, the disc reproducing apparatus of the present invention was conceived in order to solve such a problem, and provides a compact disc reproducing apparatus which enables connection with various digital audio equipments. Is intended.

[0008]

Means for solving the problems: A memory for writing digital data read at a higher speed than a disk, a means for sequentially reading and outputting the data written in this memory from the oldest one, and an abnormality of the digital data When detected, in a compact disc reproducing apparatus equipped with a data loss correction control means for returning to the position before the occurrence of the abnormality and performing data continuation and rewriting, a digital disc that outputs the data read from the memory serially. An interface circuit is provided.

A memory for writing digital data read at a speed higher than that of the disk, a means for sequentially reading and outputting the data written in the memory from the oldest one, and when an abnormality of the digital data is detected, Control data corresponding to the operating conditions and setting conditions of the disc is obtained in a compact disc reproducing device having a data loss correction control means for returning to the position before the occurrence of the abnormality and for making the data continuous and rewriting. Means and a digital audio interface circuit for adding control data to the data read from the memory and outputting the control data may be provided.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1, a disk reproducing apparatus of the present invention stores a digital audio signal output from a signal processing circuit 5 in a memory 8 as in a conventional disk reproducing apparatus.
A data loss correction control circuit 7 and a CPU 9 for writing or reading data to and from the digital
The audio interface circuit 10 is provided.

The digital audio interface circuit 10 is a circuit for outputting the digital audio signal read out from the memory 8 at a normal speed as it is, or for adding control data to the digital audio signal and outputting it.

Data loss correction control circuit 7 and CPU 9
By checking the data read from the disc 1, operating conditions, setting conditions, etc.,
In addition to audio signal, source type, sampling frequency,
It is possible to obtain the control data necessary for the format of the digital audio interface of the Japan Electronics Manufacturers' Association standard such as clock accuracy, copyright protection, left and right channel management data.

Therefore, in the digital audio interface circuit 10, at least the left and right digital
In addition to outputting an audio signal, the obtained control data is added and output. That is, as shown in the format diagram of FIG. 2, the sync bit a and the user data (digital audio data) are in a format compliant with the digital audio interface format of the Japan Electronics Manufacturers Association.
d, control data c is output via the two lines.

When configured to output a digital audio signal to which such control data c is added, a digital amplifier, a digital signal processor, a mini disk, a digital compact cassette which requires the control data c , Digital audio
It can be used by connecting to a digital audio device such as a tape recorder (DAT).

Although the embodiment in which the disc reproducing apparatus of the present invention is applied to the digital audio equipment has been described above, the same operation and effect can be obtained even when applied to the digital video equipment and the digital information equipment.

Further, the disc reproducing apparatus of the present invention can be used not only for the seismic function but also for the purpose of compensating for the loss of data which occurs when the disc is exchanged in a compact disc or a video disc.

[0017]

As is clear from the description based on the above embodiments, according to the disc reproducing apparatus of the present invention, it is possible to easily connect to various digital devices by using the digital interface of the Japan Electronics Manufacturers Association. Therefore, it is possible to add variety to connectable digital devices.

Since the signal output from the digital interface circuit is output via the two lines,
Wiring is easy, and excellent effects such as being less susceptible to noise can be achieved.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a disc reproducing apparatus of the present invention,

FIG. 2 is a format diagram of data output from the disc reproducing apparatus of the present invention,

FIG. 3 is a block diagram showing an example of a conventional disc reproducing apparatus,

FIG. 4 is a timing chart showing the timing of data output from a conventional disc reproducing apparatus.

[Explanation of symbols]

 1 disk 2 optical pickup 3 spindle motor 4 head amplifier 5 signal processing circuit 6 servo processing circuit 7 data loss correction control circuit 8 memory 9 CPU 10 digital audio interface circuit 11 drive circuit

Claims (3)

[Claims] 1. A memory for writing digital data read at a higher speed than a disk, a unit for sequentially reading and outputting the data written in the memory from the oldest one, and when an abnormality of the digital data is detected. In a disc reproducing apparatus provided with data loss correction control means for returning to a position before occurrence of an abnormality and for making data continuous and rewriting to the memory, a digital interface for serially outputting data read from the memory A disc reproducing apparatus having a circuit. 2. A memory for writing digital data read at a higher speed than a disk, a means for sequentially reading and outputting the data written in the memory from the oldest one, and when an abnormality of the digital data is detected. In a disc reproducing apparatus provided with data loss correction control means for returning to a position before the occurrence of an abnormality, and for making data continuous and rewriting to the memory, a control unit corresponding to the operating condition and the setting condition of the disc. A disc reproducing apparatus comprising: means for obtaining data; and a digital interface circuit for adding the control data to the data read from the memory and outputting the data. 3. The disc reproducing apparatus according to claim 1, wherein loss of data at the time of disc exchange is corrected.