JPS62289965A - Inter-channel copy system in digital multichannel recorder - Google Patents

Abstract

PURPOSE:To copy data between optional channels without degradation by controlling a data selector to input the output of the copy source channel from a reproducing-system signal processing circuit to the copy destination channel of a recording-system signal processing circuit. CONSTITUTION:A data selector 11 which switches a data input circuit of each channel of a recording-system signal processing circuit 2 is provided among an A/D converter 1, the circuit 2, and a reproducing-system signal processing circuit 7. In case of copy of digital data recorded on a recording medium 10 between channels, the selector 11 is controlled to input output data of the copy source channel from the circuit 7 to the copy destination channel of the circuit 2. Thus, digital data is copied between optional channels without degradation as it is.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention [Field of Industrial Application] The present invention relates to an inter-channel copying method in a digital multi-channel recorder.

[Summary of the invention]

In a digital multi-channel recorder, the present invention uses a data selector to copy digital data recorded on a recording medium between channels.
The output data of the copy source channel from the reproduction system signal processing circuit is input to the copy destination channel of the recording system signal processing circuit, so that copying between arbitrary channels can be performed as digital data without deterioration. be.

[Conventional technology]

The system block diagram of a conventional digital multi-channel recorder is shown in Figure 3.
When recording data, the input analog signal (audio signal) is converted into digital data by the A/D converter 1, and after signal processing is performed through the recording system signal processing circuit 2,
The signal is amplified by a recording amplifier 3 and recorded on a magnetic tape 10, which is a recording medium, by a recording head 4.

Note that the digital data of each channel may be recorded on different tracks of the recording medium 10, but the recording system signal processing circuit 2 compresses the time of the digital data of each channel and converts it into time-series data. It is also possible to record on the same track of the medium 10.

On the other hand, during data reproduction, the data recorded on the magnetic tape 10 is read by the reproduction head 5, amplified by the reproduction amplifier 6, signal processed by the reproduction system signal processing circuit 7, and analog signal ( audio signal) and output.

In this case as well, the data of each channel recorded chronologically on the same track of the recording medium 10 is reproduced as is by the magnetic head 5, and the data of each channel is converted into parallel data of each channel in the reproduction system signal processing circuit 7. By the way, in a conventional digital multi-channel recorder equipped with such a data recording system and a data reproducing system, when data recorded on the magnetic tape 10 is copied between each channel, the data reproducing system is The analog signal of the copy source channel output from the system's D/A converter 8 is input to the data recording system's A/D converter 1 via an externally connected mixer 9, where it is converted back into digital data and converted into magnetic data. Generally, a method was used in which data was recorded on the copy destination channel of the tape 10.

[Problem that the invention seeks to solve]

However, with such conventional channel-to-channel copying methods, the person operating the device must manually select the channel to play and the channel to record (copy), and it is difficult to specify the time of the portion to be copied. , it was necessary to operate any channel at any time, and the operation of the equipment was complicated and not something that anyone could easily do.

In addition, since the digitized playback data of the copy source is restored to an analog signal, passed through an analog circuit such as a mixer, and then digitized again and recorded on the copy destination channel, signal deterioration (in the case of audio signals) This leads to problems such as deterioration of sound quality (deterioration of sound quality) and deterioration of S/N ratio, making it impossible to take full advantage of the high quality of digital equipment.

The present invention aims to solve such problems in inter-channel copying.

[Means for solving problems]

Therefore, the inter-channel copy method in the digital multi-channel recorder according to the present invention is applicable to the digital multi-channel recorder shown in FIG. A data selector for switching the data input circuit of each channel of the recording system signal processing circuit is installed between the data input circuit and the data selector for switching the data input circuit of each channel of the recording system signal processing circuit. By controlling the data selector so that the output data of the channel is input to the copy destination channel of the recording system signal processing circuit, copying between arbitrary channels can be performed as digital data without deterioration.

〔Example〕

Embodiments of the present invention will be described below based on the drawings.

FIG. 1 is a block diagram showing the system configuration of a digital multi-channel recorder for implementing the present invention, and the same blocks as in FIG. 3 are given the same reference numerals.

This digital multi-channel recorder is different from the conventional example shown in FIG. In addition to interposing and providing a data selector 11 for switching the data input circuit of the channel,
This is because an external control device 12 is provided to accompany it.

This data selector 11 is a circuit that arbitrarily switches the input circuit of each channel of the recording system signal processing circuit 2 to either the A/D converter 1 or the output circuit of each channel of the reproduction system signal processing circuit 7, and is externally controlled. Depending on the control signal from the device 112, either the input digital data converted by the AID converter 1 or the reproduction digital data output from the reproduction system signal processing circuit 7 is selected and input to the recording system signal processing circuit 2.

The external control device 112 includes a select switch for arbitrarily specifying a copy source channel on the playback signal processing circuit 7 side and a copy destination channel on the recording signal processing circuit 2 side, and a select switch for starting and ending copying at any time. It is equipped with operating means such as a switch for giving instructions.

When performing inter-channel copying of data recorded on the magnetic tape 10 according to this embodiment, the external control device 1
2, the data selector 11 is controlled to input the output data of the copy source channel from the reproduction system signal processing circuit 7 to the copy destination channel of the recording system signal processing circuit 2, and the desired data can be transferred as digital data. channel.

Therefore, problems such as deterioration of signal quality and deterioration of S/N that occur in analog circuit parts such as mixers, which occur in the conventional inter-channel copying method, are eliminated.

Next, various aspects of inter-channel copying using this method will be explained.

First, when copying all the data of one channel to one or more other channels, the playback system reproduces the data of the one copy source channel using the data selector 11 over the entire section of the magnetic tape. The output data of the signal processing circuit 7 may be input to one or more copy destination channels of the recording system signal processing circuit 2.

Further, when inter-channel copying is performed in a part of the magnetic tape 10, the arrangement is as shown in FIG. 2, for example.

What is shown in FIG. 2(a) is a case where digital data of one channel is copied to multiple other channels at the same time, and at time A, the external control bag W112 controls the data selector 11 and the recording system Each channel (hereinafter abbreviated as rcHJ) b, CHc, and C of the signal processing circuit 7
In both cases, the CH of the reproduction system signal processing circuit is used as the HD input.
Select the output data of a.

As a result, the CHa recorded on the magnetic tape 10
data is sent to the playback head 5. It is reproduced through the reproduction amplifier 6 and the reproduction system signal processing circuit 7 and output to the data selector 11, which is input to each of the three channels CHb to CHd of the recording system signal processing circuit 2, and is then output to the recording amplifier 3.
After being amplified by the recording head 4, the magnetic tape 10 is
is recorded as data for each channel.

Then, when time B in FIG. 2 is reached, the external control device W12
controls the data selector 11 to select the output data of the corresponding channels of the A/D converter 1 as the input data of CHb, CHc, and CHd of the recording system signal processing circuit 2, and ends the inter-channel copying. do.

In this way, data of CHa is transferred to C between time A-B.
It can be copied to Hb, CHc, and CHd.

Next, what is shown in FIG. 2(B) is a case where a plurality of different copies are performed within the same time, and at time C, the external control device 12 controls the data selector 11, and the recording system signal processing circuit 2 CHb and CHd select and copy the output data of CHa and CHc of the reproduction system signal processing circuit 7, respectively, and when the time is reached, each A
The output data of CHb and CHd of the /D converter 1 are switched to be selected, and inter-channel copying is completed.

In this way, the data of CHa can be copied to CHb and the data of CHc can be copied to CHd between times CD.

Furthermore, what is shown in FIG. 2(c) is a case where copying is performed between a plurality of channels at different times, and at time E, the data selector 11 selects the reproduction system signal as the input data of CHd of the recording system signal processing circuit 2. The output data of CHc of the processing circuit 7 is selected, and at time F, the output data of CHc of the recording system signal processing circuit 2 is selected.
CHa of the reproduction system signal processing circuit 7 as input data of Hb.
Select output data.

Then, at time G, the CH of the recording system signal processing circuit 2
The output data of the A/D converter of the same channel is selected as the input of CHd of the recording system signal processing circuit 2. At time H, the output data of the A/D converter of the same channel is selected as the input of CHd of the recording system signal processing circuit 2. Switch between each.

By giving such a control signal to the data selector 11 from the external control device 12, the data of CHc is copied to CHd between times E-H, and the data of CHc is copied to CHd between times FG.
data is copied to CI-1h.

The control of the data selector during inter-channel copying as described above may be performed manually by the person operating the digital multi-channel recorder using the external control device 12, or may be programmed in advance and operated automatically. It is also possible.

Note that the recording medium of the digital multi-channel recorder implementing this invention is not limited to magnetic tape;
Other recording media such as magnetic disks and optical disks can also be used as long as they can record and reproduce multi-channel digital data.

〔Effect of the invention〕

As explained above, according to the inter-channel copying method in the digital multi-channel recorder according to the present invention, recorded data can be copied between each channel as digital data inside the device without deteriorating the quality of the data. can be done.

Furthermore, data from any channel can be easily copied to any channel at any time.

[Brief explanation of the drawing]

Fig. 1 is a block configuration diagram of a digital multi-channel recorder for implementing the present invention, Fig. 2 is an explanatory diagram of inter-channel copying using the same, and Fig. 3 is a block configuration diagram of a conventional digital multi-channel recorder. It is a diagram.

Claims (1)

[Scope of Claims] 1. A data recording system that converts an input signal into digital data by an A/D converter and records it on a recording medium by a recording head through a recording system signal processing circuit; A digital multi-channel recorder is equipped with a data reproduction system that reads out digital data by a reproduction head, passes through a reproduction system signal processing circuit, restores it to an analog signal by a D/A converter, and outputs the analog signal. A data selector for switching the data input circuit of each channel of the recording signal processing circuit is provided between the converter, the recording system signal processing circuit, and the reproduction system signal processing circuit, and a data selector is provided between the channels of the digital data recorded on the recording medium. An inter-channel copy characterized in that when copying, the data selector is controlled so that the output data of the copy source channel from the reproduction system signal processing circuit is input to the copy destination channel of the recording system signal processing circuit. method.