JPH0366051A - Magnetic tape reproducing device - Google Patents

Abstract

PURPOSE:To reduce the sensor of incongruity which occurs in listening to information by controlling a mechanical part by a control part and performing the fast forwarding of a magnetic tape by a prescribed quantity when the number of muting signals or muting outputs exceeds a prescribed number within a 1st prescribed time. CONSTITUTION:The signal processing of the reading signal of a magnetic head 2a is performed by a signal processing circuit 4, a reproducing signal is outputted to a D/A converter 5 and an error rate is outputted to a defective reproducing detection circuit 6. The error rate is compared with an allowable value and when the error rate exceeds the allowable value, the muting signal is outputted to the control part 7 by the circuit 6. The outputting number of the muting signals is counted by the counter 7b of the control part 7, when the number exceeds the prescribed number within the 1st prescribed time which is measured by a 1st timer 7a, the fast forwarding of the magnetic tape is performed by the prescribed quantity by the mechanical part 2. Thus, the sense of incongruity which occurs in listening to the information can be reduced even though the magnetic tape has a damage.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a magnetic tape playback device that plays back information recorded in digital signals on a magnetic tape (hereinafter, the information will be explained as music information). It is.

[Conventional technology]

Conventional magnetic tape playback devices, such as digital audio recorders (DATs) that play back music information from magnetic tapes on which music information is recorded as digital signals.
The system monitors the error rate of the playback signal while the magnetic tape is running to play back music information, and if the error rate exceeds an allowable value, the playback sound is muted. There is something.

In such magnetic tape playback devices, if the magnetic tape is damaged, the playback sound is muted even if the playback sound from the damaged part of the magnetic tape exceeds the error rate tolerance and is difficult to hear. You can enjoy music information without making it difficult to listen to it.

[Problem to be solved by the invention]

Conventional magnetic tape playback devices are configured as described above, so if, for example, there are scattered scratches on the magnetic tape,
Each time the music is muted, the sound cuts out, creating an inconvenient feeling when listening to music information.

In addition, if there is a continuous scratch of a certain length on the magnetic tape, music information will be lost due to continuous muting, which will cause a sense of discomfort, and the magnetic tape playback device will malfunction due to the continuous state of not playing music information. There was an inconvenience that people mistakenly thought that they had done so.

This invention was made in order to eliminate the above-mentioned inconveniences, and it is an object of the present invention to reduce the sense of discomfort when listening to information even if there are skips or continuous scratches of a predetermined length on the magnetic tape. The present invention provides a magnetic tape playback device that can perform the following functions.

[Means to solve the problem]

The magnetic tape playback device according to the present invention includes a mechanical section that runs a magnetic tape housed in a cassette half and plays back information recorded on the magnetic tape as a digital signal, and a magnetic head of this mechanical section that outputs information recorded on the magnetic tape as a digital signal. There is a signal processing circuit that processes the read signal that reads information from the magnetic tape and outputs a neat output based on the mute signal, and also processes errors and errors in the playback signal output by this signal processing circuit. The error rate is compared with the allowable value, and if the error rate exceeds the allowable value, the playback failure detection circuit outputs a playback failure detection signal and controls the mechanical section, and also outputs a mute signal based on the playback failure detection signal. , a control section that controls the mechanical section to feed the magnetic tape by a predetermined amount in a fast forward mode when the number of mute signals or mute outputs exceeds a predetermined number within a first predetermined time.

Moreover, the magnetic tape playback device according to another invention of the present invention controls a mechanical part instead of the control part of the previous invention, and also outputs a mute signal based on a playback failure detection signal, and outputs a mute signal or a mute signal. A control section is provided that controls the mechanical section so that when the output continues for a second predetermined period of time, the magnetic tape is fed by a predetermined amount in fast forward mode.

[For production]

The control unit of the magnetic tape reproducing apparatus according to the present invention controls the mechanical unit to feed the magnetic tape by a predetermined amount in fast forward mode when the number of mute signals or mute outputs exceeds a predetermined number within a first predetermined time.

Further, the control section of the magnetic tape reproducing apparatus according to another aspect of the present invention controls the mechanical section to feed the magnetic tape by a predetermined amount in fast forward mode when the mute signal or the mute output continues for a second predetermined period of time.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of a magnetic tape reproducing apparatus according to an embodiment of the present invention.

In FIG. 1, reference numeral 1 indicates an operation section, which is provided with a plurality of keys for specifying various operations.

2 indicates a mechanical part that runs and stops the magnetic tape contained in the loaded cassette half, and when the magnetic tape is running in playback mode, the magnetic part that reads the music information recorded on the magnetic tape. A hexagon 2a is provided.

3 is a high frequency amplifier (RF amplifier) that amplifies the read signal output by the magnetic head 2a, 4 is a signal processing circuit, and R
It processes the output signal of the F amplifier 3 and outputs a reproduced signal, error rate, etc.

Reference numeral 5 denotes a digital-to-analog converter (D/A converter), which converts the digital signal output from the signal processing circuit 4 into an analog signal and outputs an audio signal.

Reference numeral 6 denotes a reproduction defect detection circuit, which compares the error rate of the reproduction signal outputted by the signal processing circuit 4 with a permissible value, and outputs a reproduction defect detection signal when the error rate exceeds the permissible value.

Reference numeral 7 denotes a control unit having a first timer 7a that measures a first predetermined time, a counter 7b that counts the number of mute outputs output by the signal processing circuit 4, and a second timer 7c that measures the duration of the mute output. , the operating section 1. Based on the outputs of the mechanical section 2 and the reproduction failure detection circuit 6, the mechanical section 2. It controls the signal processing circuit 4.

FIGS. 2(a) and 2(b) are explanatory diagrams showing the damaged state of the magnetic tape.

In Figure 2, T indicates the magnetic tape, and D I-D a indicates damage (scratches, etc.) formed on the magnetic tape T. Damages D1 to D are short-term damage, and the damage state is continuous for a long time. This is what I did.

FIG. 3 is a flowchart for explaining an example of the operation, and STI to 5T12 indicate each step.

Next, the operation will be explained.

First, when the playback key of the operation unit 1 is operated with a cassette half loaded in the mechanical unit 2, the control unit 7 sets the mechanical unit 2 to the playback mode (Step 5TI), and transfers the information on the magnetic tape T to the magnetic field. Read with 2a.

In this state, the read signal of the magnetic head 2a is amplified by the RF amplifier 3, then processed by the signal processing circuit 4, the music information (digital signal) is output to the D/A converter 5, and the error rate is The signal is output to the reproduction defect detection circuit 6.

Then, the reproduction defect detection circuit 6 compares the error rate with an allowable value, and if the error rate exceeds the allowable value, outputs a reproduction defect detection signal. Step 5T2), if there is no defective reproduction detection signal, continues monitoring the defective reproduction detection signal, and if there is a defective reproduction detection signal, the first
The timer 7a and counter 7b are reset and started (step 5T3), and a mute signal is sent to the signal processing circuit 4 (step 5t4).

Next, it is determined whether the second timer 7C is operating (step 5T5), and if the second timer 7c is not operating, the second timer 7''C is reset and started (step 5T6). ), or if the second timer 7C is activated in step 5T2, the second timer 7C is activated.
In step 5T7), it is determined whether the measured value t2 of C exceeds the second predetermined time Tt%, for example, 2 seconds.
Predetermined time T! If the timer 7a is not exceeded, the first timer 7a
It is determined whether the measured value tl exceeds a first predetermined time TI, for example, 5 seconds (step 5T8).

If it is determined in step 5T2 that the measured value does not exceed the first predetermined time TI, it is determined whether there is a poor reproduction detection signal (step 5T9), and if there is no defective reproduction detection signal, the second timer 7c is activated. After stopping (step 5 TIO), the process proceeds to step ST8, and if there is a reproduction defect detection signal, the process proceeds to step ST4.

Next, if it is determined in step ST8 that the measured value exceeds the first predetermined time TI, it is determined whether the count (!n) of the counter 7b exceeds a predetermined number N, for example, 5.
TII), if the count value n does not exceed the predetermined number N,
Proceeding to step ST2, if the count value n exceeds the predetermined number N, or as determined in step ST7, the measured value 11 is the second
If the predetermined time TI has been exceeded, the mechanical section 2 is set to fast forward mode (FF mode) and the magnetic tape T is transferred by a predetermined amount.
For example, send an amount equivalent to 30 seconds (step 5T12)
, proceed to step STI.

Therefore, according to this embodiment, while the information on the magnetic tape T is being reproduced, the second
When there is a predetermined number N of damage D, ~D3 as shown in Figure (a), the magnetic tape T is fast forwarded by a predetermined amount and played back
At the point where the magnetic tape T is fed a predetermined amount and playback is started, there is usually damage D I''' D as shown in Figure 2 (a).
Since there is no s, it is possible to reduce discomfort when listening to music information.

Also, while the information on the magnetic tape T is being reproduced, the second
Damage D4 as shown in Figure (c) occurs during the second predetermined time T.
2, the magnetic tape T is fast-forwarded by a predetermined amount and reproduced, so that the sense of discomfort can be similarly reduced.

In the above-described embodiment, the counter 7b and the second timer 7c are explained as counting and measuring the neat output as soon as the signal processing circuit 4 outputs it. A similar effect can also be obtained.

Although the example has been described in which it is determined whether the count value t exceeds the predetermined number N after the first predetermined time TI has elapsed, the count value t exceeds the predetermined number N within the first predetermined time TI.

It may be configured to determine whether or not exceeds a predetermined number N.

Further, although the example has been described in which the magnetic tape T is fed by a predetermined amount, it may be configured to feed up to the beginning of the next music information. In this case, the discomfort can be further reduced.

Furthermore, although the first predetermined time TI is shorter than the second predetermined time Tt, the second predetermined time T2 may be longer than the first predetermined time TI.

Further, although the example in which the information is music information has been described, other information such as a conversation may be used.

〔Effect of the invention〕

As described above, according to the present invention, when the number of mute signals or ξ NEET output exceeds a predetermined number within a first predetermined time, or when the mute signal or ξ NEET output continues for a second predetermined time, magnetic Since the tape is fed by a predetermined amount in fast-forward mode, it is possible to reduce discomfort when listening to information.

Furthermore, by setting the feed amount (predetermined amount) to the beginning of the next information, it is possible to further reduce the sense of discomfort when listening to the information.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of a magnetic tape playback device according to an embodiment of the present invention, FIGS. 2(a) and (b) are explanatory diagrams showing damage states of the magnetic tape, and FIG. 3 is an illustration of the operation. It is a flowchart for explaining an example. DESCRIPTION OF SYMBOLS 1... Operation part, 2... Mechanical part s2a... Magnetic head, 4... Signal processing circuit, 6... Reproduction defect detection circuit, 7... Control part, 7a... First timer, 7b...
・Counter, 7c...Second timer, T...Magnetic tape, D1-D4...Damage.

Claims (3)

[Claims] (1) A mechanical unit that runs a magnetic tape housed in a cassette half and reproduces information recorded on the magnetic tape as a digital signal, and a mechanical unit that plays back the information recorded on the magnetic tape by a magnetic head of this mechanical unit. A signal processing circuit that processes the read signal and outputs a mute output by muting the playback signal based on the mute signal, and compares the error rate of the playback signal output by this signal processing circuit with a tolerance value. and a reproduction defect detection circuit that outputs a reproduction defect detection signal when the error rate exceeds the tolerance value; and a reproduction defect detection circuit that controls the mechanical section and outputs the mute signal based on the reproduction defect detection signal; a control unit that controls the mechanical unit to feed the magnetic tape by a predetermined amount in a fast forward mode when the number of times the mute signal or the mute output exceeds a predetermined number within a first predetermined time; playback device. (2) A mechanical unit that runs the magnetic tape housed in the cassette half and reproduces information recorded on the magnetic tape as a digital signal, and a mechanical unit that plays back information on the magnetic tape output by a magnetic head of this mechanical unit. A signal processing circuit that processes the read signal and outputs a mute output by muting the playback signal based on the mute signal, and compares the error rate of the playback signal output by this signal processing circuit with a tolerance value. and a reproduction defect detection circuit that outputs a reproduction defect detection signal when the error rate exceeds the tolerance value; and a reproduction defect detection circuit that controls the mechanical section and outputs the mute signal based on the reproduction defect detection signal; A magnetic tape playback device comprising: a control section that controls the mechanical section to feed the magnetic tape by a predetermined amount in a fast forward mode when the mute signal or the mute output continues for a second predetermined time. (3) Claim (1) that the predetermined amount is up to the beginning of the next information.
) or the magnetic tape playback device described in (2).