JPS61142569A - Multi-channel recording/reproducing device - Google Patents

Abstract

PURPOSE:To restore an original signal easily on the basis of a signal of a memory device by saving a signal including the original signal obtained from a section from an erasing head to a testing head in the memory device at the detecting of defective recording. CONSTITUTION:When defective signal or the like is detected, signal erasing from a recording medium 1 is stopped and the original signal recorded in the recording medium in a section from a reproducing head 2 to the testing head 5 is written in the memory device 20. During the stopped status, correction such as the removal of a substance adhered to a recording head 4 is executed, the recording medium 1 is rewound to head the position where recording is failed, and a switch 19 is turned from said position to rerecord the signal written in the memory device 20. Consequently, the original signal is restored in the recording medium 1 and the restored recording medium 1 is rewound again, so that processing such as the replacement or the like of a voice signal can be retried.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a multi-channel recording and reproducing apparatus in which a plurality of channels are multiplexed onto a single transmission path and recorded and reproduced.

[Conventional technology]

For example, in a digital video recorder, a video signal and an audio signal are both digitized, combined in a predetermined format, and recorded and reproduced on a recording medium by a single recording and reproduction head. In such a multi-channel recording and reproducing apparatus, there has been a desire to rewrite only the audio signal with another audio signal, for example. In that case, for example, a method as shown in FIG. 2 may be considered.

In the figure, a recording medium (1) such as a magnetic chip f is transferred from left to right in the drawing, and from the supply side of this recording medium (1), a reproducing head (2), an erasing head (3), a recording head (
4) is provided. The signal reproduced by the reproduction head (2) is then supplied to the decoder (6) through the reproduction amplifier α and the equalizer/slicing circuit, where the video signal and audio signal synthesized according to the above-mentioned predetermined format are separated. Each is made into an arbitrary denotal signal and taken out to the output terminal α◆. Also, the signal from the decoder α is supplied to the 7' signal mixer (to), and the input terminal H
For example, the data of the audio signal is swapped with another audio (digital) signal. This swapped signal is sent to encoder α
η and synthesized in the predetermined format described above,
The signal is supplied to the recording head (4) through the recording amplifier 0. Also, during the period when the recording a/no α8 is being driven, an erasing signal is supplied to the erasing head (3).

As a result, for example, a signal in which only the audio signal is replaced is recorded.

However, in this case, recording on the recording medium (1) may not be performed normally due to malfunction of the recording system.

In that case, for example, it is possible to detect recording defects by throwing an inspection spatula P (5) at the rear stage of the recording head (4), but even if such a detection were performed and the operation of the device was immediately stopped, However, it becomes impossible to restore the signal recorded on the recording medium (1) which has already passed in front of the erasing head (3) at that point.

Generally, the head (2) is set so that the signal reproduced by the playback head (2) is re-recorded at the same position on the recording medium (1).
), (4) and the processing time of the processing system are designed, so for example, the distance between heads (2) and (3) may be made sufficiently long so that erasing will not occur until recording is confirmed. I can't. Furthermore, in many cases, the above-mentioned recording defects are easily repairable, such as an increase in spacing loss due to deposits on the recording head.

[Problem that the invention seeks to solve]

Conventional devices were constructed as described above. Therefore, if re-recording to the recording medium fails due to malfunction of the recording system, a part of the original signal recorded on the recording medium (1) will be erased, and it will be difficult to restore it. There was a problem that made it impossible.

[Means for solving problems]

In the present invention, a reproducing head (2), an erasing head (3), and a reproducing head (2) are sequentially inserted from the supply side of a recording medium (1).
recording head ( ) that processes and re-records part of the signal from
4) and an inspection head (5) for inspecting the signal recorded by the recording head (4), the signal system from the reproduction head (2) is provided with an inspection head (5) for inspecting the signal recorded by the recording head (4). A memory device with a larger capacity corresponding to the transport time of the recording medium (1) to the head (5) is provided, and when an error is detected in the signal of the inspection head (5),
The signals of the memory device are read out and the recording head (4) is read out.
) is a multi-channel recording and reproducing apparatus in which the signal is re-recorded on the recording medium (1) at the same position where it was reproduced.

[Effect]

According to this device, when a recording defect is detected, the signal including the original signal from the erase head to the inspection head at that time is saved in the memory device, so it can be easily detected using the signal of this memory device. The original signal can be restored.

〔Example〕

In FIG. 1, a signal from a decoder (2) is supplied to a memory device (a). Memory installation here! (b) The recording medium (from the reproducing head (2) to the inspection head (5)
A larger capacity is provided corresponding to the transfer time of 1).

The signal from the memory device (a) and the signal from the decoder (ii) are selected by the switch α→ and supplied to the digital mixer (to).

Further, the signal from the test head (5) is supplied to an equalizer slice drop-act detection circuit through the current amplifier ψη, and a dropout is detected by, for example, a decrease in the envelope. Furthermore, the signal from the detection circuit (1) is supplied to the error detection circuit (a), and a defective signal is detected, for example, by increasing the error flag of the error correction circuit. These detection signals are supplied to the emergency operation control circuit (c) through the OR circuit (c), and in the event of a dropout or signal failure, the control signals are sent to the recording amplifier QI, switch 4, memory device = V, and the device (not shown). Supplied to the system control circuit.

Therefore, when the above-mentioned signal failure or the like is detected in this device, first the operation of the recording amplifier A and the write operation of the memory device (A) are stopped. Additionally, the entire device is placed in a stop mode by the system control circuit. As a result, erasing of the signal on the recording medium (1) is stopped from now on, and
At this time, the original signal recorded on the recording medium (1) between the reproducing head (2) and the inspection head (5)' is written in the memory device 4. Therefore, in this stopped state, the recording head Perform repairs such as removing the deposits in (4), then rewind the recording medium (1) to locate the position where the recording is defective, and from this position switch switch 4 to store the data in the memory device. re-record the input signal.

As a result, the original signal is restored to the recording medium (1),
This restored recording medium (1) can be rewound and processes such as replacing the back door signal can be re-performed.

Processing such as audio signal replacement is performed in this way. According to the above-mentioned device, when a recording defect is detected, the signal containing the original signal from the erasing head to the inspection head at that time is stored in the memory. Since it is saved in the device, the original signal can be easily restored using the signal in this memory device.

In the above-mentioned apparatus, the memory device may not be provided separately, but may also be used as a built-in memory for processing of the encoder o3 or the encoder αno.

〔Effect of the invention〕

According to the present invention, at the time when a recording defect is detected, the signal including the original signal from the erasing head to the inspection head at that time is saved in the memory device, so it is easy to use the signal from the memory device. It is now possible to restore the original signal.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an example of the present invention, and the second factor is a block diagram of a conventional device. (1) is a recording medium, (2) is a reproducing head, (3×1 erasing head), (4) is a recording head, (5) is an inspection head, and the pen is a memory device.

Claims (1)

[Claims] In order from the supply side of the recording medium, a playback head, an erase head, a recording head that processes and re-records a part of the signal from the playback head, and an inspection for inspecting the signal recorded by this recording head. A memory device with a larger capacity corresponding to the transfer time of the recording medium from the reproducing head to the test head is provided in the signal system from the reproducing head to prevent errors in the signal from the test head. The multi-channel recording/reproducing apparatus is configured such that when a signal is detected, the signal from the memory device is read out and re-recorded by the recording head at the same position on the recording medium where the signal was reproduced.