JPS62264482A - Pcm signal recording and reproducing device - Google Patents

Abstract

PURPOSE:To detect and display the degree of the deterioration of recording media by providing a means to compare the error ratio of a signal read from the recording media with a reference value and a means to display the output of a comparing means. CONSTITUTION:A reproducing signal processing circuit 1 supervises an error correcting frequency by an error correcting circuit 5 and sends the signal to display the error ratio to a comparator 2. To the comparator 2, the prescribed reference value is given from a decoder 3, the error ratio from the reproducing signal processing circuit 1 and the reference value given from the decoder 3 are compared and the signal to display the comparing result is sent to a displaying circuit 4. The displaying circuit drives an indicator 9 in accordance with the signal to display a comparing result received from the comparator 2 and the prescribed displaying is executed. Namely, when the error ratio of the signal reproduced from a magnetic tape 8 exceeds the reference value set by the decoder 3, the comparator 2 gives an output signal to the displaying circuit 4 and displays this by the indicator 9. Thus, it can be known to which degree the deterioration of the recording media is proceeded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a PCM signal recording and reproducing apparatus, and more particularly to a PCM signal recording and reproducing apparatus that is capable of knowing and displaying the degree of deterioration of a recording medium.

[Prior art]

By converting information signals such as audio signals into PCM, high-quality recording and reproduction can be performed.

When converting audio signals into PCM and recording them on a magnetic tape and reproducing them, there are two methods: a method using a fixed head and a method using a rotating head. Among these, in the method using rotary heads, when two single-rotation heads are used, the two rotary heads are attached at an angular interval of approximately 180 degrees, and the magnetic tape is wound around the guide drum over the same angular range.

It is common practice to record audio PCM signals by continuously forming one track at a time alternately using two rotating heads.

In this case, the PCM information is processed to enable error correction by adding error correction information such as error correction bits, and when an error occurs in the reproduced signal, the error can be automatically corrected. It looks like this. Incidentally, related devices of this type include 1, for example, Japanese Patent Application Laid-Open No. 58-2244.
No. 15 is mentioned.

[Problem that the invention seeks to solve]

In the conventional technology described above, it is possible to correct errors in the reproduced signal, but if the recording medium itself deteriorates, playback bits often become missing, which exceeds the correction ability of the error correction circuit, and high quality A situation arises in which it becomes impossible to reproduce the signal.

The degree of deterioration of a recording medium can be determined relatively easily by observing the reproduced signal when recording and reproducing analog information, but it is extremely difficult to determine the degree of deterioration in the case of digital information such as PCM signals. there were.

The present invention provides a PCM signal recording and reproducing device that detects and displays the degree of deterioration of the recording medium on which PCM signals are recorded and reproduced, thereby knowing the deterioration of the recording medium and making it possible to predict the timing of information transfer. The purpose is to

[Means for solving problems]

The above problem can be solved by providing a comparison means for comparing the error rate of the signal read from the recording medium with a reference value, and a display means for displaying the output of the comparison means.

[Effect]

A signal output when the error rate exceeds a certain reference value indicates that an undesired change in recorded information due to deterioration of the recording medium exceeds a predetermined level. Therefore.

By displaying this output signal, it is possible to know the degree of deterioration of the recording medium.

〔Example〕

An embodiment of a PCM signal recording and reproducing apparatus according to the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of a PCM signal recording and reproducing apparatus according to the present invention, in which 1 is a reproduction signal processing circuit, 2 is a comparator, 3 is a decoder, 4 is a display circuit, and 5 is an error correction circuit. 6 is a reproduction amplifier, 7 is a magnetic head, 8 is a magnetic tape as a recording medium, and 9 is a display.

In the figure, an error-correctable information (PCM) signal (hereinafter simply referred to as information) recorded on a magnetic tape 8 is reproduced by a magnetic head 7, converted into an electrical signal, and reproduced. The signal is sent to the reproduction signal processing circuit 1 through the amplifier 6. The reproduced signal processing circuit 1 sends this signal to the error correction circuit 5, which corrects errors in the received signal and returns the corrected signal to the reproduced signal processing circuit 1.

The reproduced signal processing circuit 1 also monitors the frequency of error correction by the error correction circuit 5 and sends a signal representing the error rate to the comparator 2. The comparator 2 is given a predetermined reference value from the decoder 3, compares the error rate from the reproduced signal processing circuit 1 with the reference value given from the decoder 3, and sends a signal representing the comparison result to the display circuit 4. . The display circuit 4 drives the display 9 according to the signal representing the comparison result received from the comparator 2;
A predetermined display is performed. That is, when the error rate of the signal reproduced from the magnetic tape 8 exceeds a certain reference value set by the decoder 3, the comparator 2 provides an output signal to the display circuit 4, which is displayed on the display 9.

In the above embodiment, the comparator 2 is configured to receive a predetermined reference value from the decoder 3, and this reference value can be changed arbitrarily. Therefore, the user can select and set the reference value according to the purpose of use and conditions of use.

Note that in order to compare the error rates of signals read from the magnetic tape, a plurality of comparators each having a different reference value may be provided, or a single comparator having a plurality of reference values may be provided. You can.

Furthermore, a plurality of display circuits and display devices may be provided, each corresponding to a predetermined reference value, and one display circuit may be configured to drive a plurality of display devices corresponding to a plurality of reference values. It is okay to do so.

With the above configuration, if the magnetic tape deteriorates and the magnetic material is missing, or an undesirable change in the recorded signal occurs due to demagnetization or magnetization, error correction is performed and the error is corrected. The degree of deterioration of the magnetic tape is displayed according to the error rate, and this can be known.

〔Effect of the invention〕

According to the present invention, since the degree of deterioration of the recording medium can be displayed, it is possible to know the extent to which the deterioration of the recording medium has progressed, and the occurrence of damage to the recording due to adverse effects caused by external factors. This makes it possible to know the information, port the information as needed, solve the problems in the prior art, and provide a PCM recording/reproducing device with excellent functionality.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of a PCM recording and reproducing apparatus according to the present invention. [Explanation of symbols] 1... Reproduction signal processing circuit, 2... Comparator, 3...
Decoder, 4... Display circuit, 5... Error correction circuit,
6...Reproduction amplifier, 7...Magnetic head, 8...Magnetic tape, 9...Display unit, Tower 1 Figure!

Claims (1)

[Claims] 1. In a PCM signal recording and reproducing apparatus that includes at least a reproduced signal processing circuit and an error correction circuit and that records and reproduces information signals using a recording medium, the error rate of the signal read from the recording medium is set to a predetermined value. 1. A PCM signal recording and reproducing apparatus comprising: a comparator for comparing with a reference value; and a display for displaying the comparison result of the comparator, and configured to be able to display the degree of deterioration of the recording medium.