JPS63304470A - Digital recorder - Google Patents

Abstract

PURPOSE:To reduce the number of A/D converters and to decrease a circuit scale by sharing the A/D converter for inputting and converting a signal and the A/D converter for the time of a signal reproduction. CONSTITUTION:At the time of recording, a signal to be inputted from an input signal 1 is inputted to the A/D converter 3 through a switch 2 and the converted input signal is converted into the signal suitable for being recorded by a signal processing part 5 through the switch 4. Then, after it is error-corrected and coded by an error correcting coding part 6, it is outputted to a recording signal 7. Next, at the time of reproduction, the reproducing signal 8 obtained from a recording medium is inputted to the A/D converter 3 through the switch 2 and the converted reproducing signal is inputted to a signal detecting part 10 through the switch 4. The detecting part 10 detects the signal by using digital multilevel information obtained by the A/D converter 3. The detected signal is error-corrected by an error correcting part 11 and converted into the former state of the signal by a signal processing part 12 and outputted to the output signal 13.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a digital recording device that digitizes and records images and sounds.

Conventional technology Digital VTR that digitizes and records image signals
2. Description of the Related Art A method has been proposed in which, when reproducing a recorded digital signal, the reproduced signal is digitized and the signal is detected in a DAT that digitizes and records an audio signal. This is better than deciding whether the reproduced signal is 1 or 0 using one threshold for each sample as in the past.
This is because the error rate is better if a plurality of samples are digitized and detection is performed using multi-level information of the plurality of samples. Viterbi decoding is known as such a method.

Further, by using such a method in error correction and error detection after signal detection, it is possible to significantly improve error correction ability and error detection ability.

Problems to be Solved by the Invention However, the above configuration requires two converters: an analog-to-digital (hereinafter referred to as A/D) converter for the input signal and an A/D converter for the reproduced signal. However, this method has the drawback of increasing the circuit scale.

SUMMARY OF THE INVENTION An object of the present invention is to provide a digital recording device that improves the above-mentioned drawbacks.

Means for Solving the Problems The present invention provides a digital recording device that digitizes and records image signals and audio signals. This digital recording device is characterized in that it also shares an analog-to-digital converter used when sampling and digitizing signal detection, false 9 correction, and false 9 detection.

Operation The present invention has the above-described configuration to provide an A/
By sharing the D converter and the AD converter during signal reproduction, the number of AD converters can be reduced and the circuit scale can be reduced.

The embodiment diagram is a block diagram of an embodiment of the present invention. In the figure, 1 is an input signal, 2 is a switch, 3 is an A/D converter, 4 is a switch, 6 is a signal processing section, 6 is an error correction encoding section, 7 is a recording signal, 8 is a reproduction signal, 9 is a recording - Reproduction control section, 1o is a signal detection section, 11 is an error correction section, 12 is a signal processing section, and 13 is an output signal.

Here, the operation of this embodiment will be explained. First, during recording, a signal inputted from input signal 1 is inputted to A/D converter 3 via switch 2 .

Here, the A/D converted input signal is converted into a signal suitable for recording by a signal processing section 5 via a switch 4. The error correction coding unit 6 then encodes the recording signal 7.
Output to. Next, during reproduction, the reproduced signal obtained from the recording medium is input as the reproduced signal 8 and outputted to the A/D converter 3 via the switch 2. The reproduced signal converted into digital information by the A/D converter 3 is input to the signal detection section 1o via the switch 4. In the signal detection section 1o, A/
Signal detection is performed using digital multilevel information obtained by the D converter 3. The information detected here is stored in the error correction unit 11
The error is corrected in the signal processing section 12, and the signal is converted into the original signal state and outputted as an output signal 13. Further, switching of the switch 2 and the switch 4 is controlled by a recording/reproduction control section 9.

Generally, a circuit for detecting a reproduced signal is not required during recording, and conversely, there is no need to A/D convert the input signal during reproduction. Therefore, the circuit scale can be reduced by switching between recording and reproduction and sharing one A/D converter as described above.

Further, by using the multi-level information of the reproduced signal obtained from the above-mentioned A/D converter during reproduction, it is also possible to significantly improve the error detection ability and error correction ability.

Effects of the Invention As described above, the present invention provides a υ circuit in which the number of A/D converters can be reduced by sharing the A/D converter during recording and the A/D converter during playback. The scale can be reduced.

[Brief explanation of drawings]

The figure is a block diagram of an embodiment of the invention. 2.4...Switch, 3...A/D converter, 9...Record/playback control unit, 1o...
- Signal detection section, 11...Error correction section.

Claims (1)

[Claims] In a digital recording device that digitizes and records image and audio signals, there is an analog-to-digital converter that samples and digitizes the input signal, and a signal detection or error correction that samples and digitizes the recorded signal during playback. A digital recording device characterized in that it shares an analog-to-digital converter used for error detection.