JPS58105414A - Multi-channel digital recording and reproducing device - Google Patents

Abstract

PURPOSE:To realize a compact and light-weight design for the titled device, by providing a means of select a prescribed number of the recording and reproducing heads in accordance with the maximum number of channels which are simultaneously recorded and reproduced. CONSTITUTION:The number of signal processing parts is limited to the number of channels needed for the simultaneous recording, and a recording head 16 and the total number of channels needed for recording are prepared. At the same time, a reproducing head 19 is prepared in the total number of channels equivalent to the head 16. A reproducing signal processing part 21 is provided in a number equivalent to the channels to be simultaneously recorded. Then N>M and N>L are defined, where N is the number of total channels to be recorded, M is the number of channels to be recorded simultaneously and L is the number of channels to be simultaneously reproduced respectively. The input signal is supplied through an input terminal 13 and processed at a recording signal processing part 14, and the channels to be recorded through a recording switch circuit 15 are set by a command given from a signal switch control circuit 22. In this case, S<M is satisfied if the input signal is referred to as S. A reproduction switch circuit 20 feeds the reproducing signal to the part 21 from the head 19 by a command given from the circuit 22.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a multi-channel digital recording and reproducing device that converts an analog signal such as a music signal into a digital signal and records and reproduces the digital signal. An object of the present invention is to provide a multi-channel digital recording/reproducing device with a simple configuration.

Conventionally, in multi-channel analog recording and playback devices used in recording studios, etc., when recording one piece of music, the orchestra is divided into small parts to form groups, and seven recording channels are assigned to each group. The orchestra can be divided into six groups, from M to F, and they can perform simultaneously or completely separately and on separate channels, for example, the 1st channel to the 6th channel. record on the flannel. Now when we play and record this at the same time, if the Mu group's performance is not good enough, the other group will monitor the recorded music from Group B to Tomi and the Mu group will play it again. The performance is recorded on a channel other than the first channel, for example, the sixth channel. In this way, unsatisfactory performances that are played again or again and again are recorded in different channels each time.

In the end, only the best performances from each group are combined to create a single piece of music. Such a recording method requires a considerably large number of channels, considering the number of groups, the number of channels to be allocated, and the number of times the performance is to be changed. For example, if there are 6 groups, and each group has 2 channels, and 2 of those groups have to replay the performance twice, the number of channels required for recording (C
(abbreviated as H)) N means that a recording/reproducing apparatus is required to have a large number of channels. However, this type of recording method is advantageous when considering the cost for the performer, so it has become common practice these days. In addition, when adopting such a recording method,
The more channels a recording/reproducing device has, the more convenient it is.

On the other hand, a conventional digital recording/reproducing apparatus is constructed as shown in FIG. 1 is an input terminal to which an analog signal is applied. Reference numeral 2 denotes an analog-to-digital converter (abbreviated as "Michiri converter") for converting an analog signal into a digital signal. 3 is a signal configuration unit that implements a signal configuration that makes it easy to take measures against data errors due to dropouts that occur on the tape when recording on the tape;
Reference numeral 4 denotes a modulation/recording section which receives the output of the signal forming section 3, converts it into a digital signal suitable for recording on a tape, and operates the recording head. A recording head 6 performs an electromagnetic conversion operation for recording onto the tape 6.

Further, 7 is a reproduction unit that reads out the signals recorded on the tape 6 in the form of electrical signals, C, 8 is a tape drive unit that runs the tape 6, and 9 is amplification and modulation of the signal reproduced by the reproduction head 7. This is a reproducing demodulation section for demodulating the digital signal into the original digital signal form. Reference numeral 10 denotes an error correction unit which corrects errors in digital data mainly caused by drops and drops on the tape, and produces error-free data. Reference numeral 11 converts the reproduced digital data into the original analog signal in a digital-to-analog conversion section (DM conversion section). 12 is an output terminal which sends an analog signal to the next stage.

The above-described configuration is required for a one-channel digital recording/reproducing device, and for N channels, this is required as a blade array. On the other hand, although digital recording and reproducing devices can achieve much higher performance than analog recording and reproducing devices, the price of each of these components is higher than that of the analog type. Therefore, the larger the number of channels, the more expensive it becomes. Furthermore, as mentioned above, the number of channels currently required of multi-channel recording and reproducing apparatuses is the greater.

The present invention provides a rational multi-channel digital recording/reproducing apparatus in which the number of channels of the signal processing section is reduced, taking such usage into full consideration. The configuration of an embodiment of the present invention will be described below with reference to FIG. 2.

13 is an input terminal to which an analog signal is applied.

Reference numeral 14 denotes a signal processing section for recording, which is composed of the same Mu-D conversion section, signal composition section, and modulation recording section as shown in Fig. The signal structure, including the necessary error detection, is modulated into a format convenient for tape recording, and then recorded.
form the signal that drives the board. 16 is a recording switching circuit that switches the output of the signal processing unit 14 based on a command as to which channel the digital data to be recorded is to be recorded;
The voltage is applied to the recording head 16. 17 is a magnetic tape;
Reference numeral 18 denotes a tape drive unit that runs the magnetic tape 17. 19 goes to reproduction, and the signal recorded on the magnetic tape is reproduced at C. Reference numeral 20 denotes a reproduction switching circuit which extracts a signal of an arbitrary channel from the reproduced signal from the reproduction mode. 2
Reference numeral 1 denotes a signal processing section for reproduction, which includes a reproduction demodulation section as described above;
It includes an error correction section, a D-mode conversion section, performs amplification and demodulation of the reproduced signal, performs correction based on data errors, performs D-DC conversion on the correct data, and outputs it as an analog signal to the output terminal 2.
Send from 3. 22 is a signal switching control circuit that controls the recording switching circuit 16 to set which channel the input signal is to be recorded on, and also controls the playback switching circuit 2o to select the required playback head and output the signal to the signal processing section. It is set to .

In the present invention, the number of signal processing units is limited to the number of channels required for simultaneous recording. That is, for recording, the number of recording channels and the total number of channels required for recording are prepared. Also, to playback, do 19 is also recording head 1.
Prepare a total number of channels equivalent to 6. The signal processing units 21 for reproduction are provided as many as the number of channels that need to be reproduced simultaneously. Assuming that the total number of channels to be recorded is N, the number of channels that need to be simultaneously recorded is M, and the number of channels that should be simultaneously reproduced is L, the following conditions are set: )f)M, N)L.

An input signal is inputted from the input terminal 13, processed by the recording signal processing section 14, and set by the recording switching circuit 16 according to a command 220. At this time, if the input signal is 8, it is used under the condition of 8 (M.
The reproduced signal from the controller is sent to the signal processing section 21 for reproduction.

For example, if the orchestra is divided into 6 performance groups and each is assigned 2 channels, the number of recording channels will be s x
20H=10 CH is required. If two groups replay their performances twice and one group replays once, the recording signal processing unit 14 required will be 100H at the time of recording the most part, 3 at the second time, and 6)X2CH=6( 3
The first and third times are 2 (Book x 20H = 4 (31)
However, since the maximum number of channels that need to be recorded simultaneously is 10 channels at the time of initial recording, 10 channels are sufficient. Next, the total number of channels to be recorded at this time is 100H + 6C1I + 40H =
200H, go to recording, do 16 requires 20 channels o On the other hand, when playing back, one tape has 20 channels worth, and it is necessary to take out the playback signal at the same time, so go to play, do 19 needs 20 channels. It becomes a channel thing. However, in the above example, only the best recordings of each group need to be extracted as playback output at the same time, so 6(
Snoring power x 2cH=100H%, that is, the signal processing section 21 for reproduction only needs to have 10 channels.

According to the above embodiment, the recording switching circuit 16 and the reproduction switching circuit 2o are controlled by the signal switching control circuit 22 to select the necessary heads for the recording heads 16 and reproduction heads 19 of the total number of channels to be recorded. By including the signal processing section 14.2 for recording, it is possible to reduce the number of signal processing sections 21 for reproduction, and in particular, the number of signal processing sections 14.2 for recording can be reduced.
According to the present invention, the maximum number of channels that can be recorded or played back simultaneously out of the total number of recordable channels can be significantly reduced. By determining the number of channels for each of the recording signal processing section and the reproduction signal processing section according to the number of channels, and providing means for selecting a predetermined number of recording/reproducing heads equal to the total number of channels, it is possible to set the number of channels smaller than the total number of channels. It can be configured with a recording or reproduction signal processing section, and can achieve significant reduction in size, weight, and cost.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a one-channel digital recording and reproducing apparatus, and FIG. 2 is a block diagram of a multi-channel digital recording and reproducing apparatus according to an embodiment of the present invention. 14... Signal processing unit for recording, 16...
・Recording switching circuit, 16...Recording to, de, 19
...Playback head, 2o...Playback switching circuit, 21...Signal processing unit for playback, 22...
...Signal switching control circuit.

Claims (1)

[Claims] A recording head and a playback head for the total number of recordable channels, an analog-to-digital converter for one channel,
The maximum number of channels to be recorded simultaneously M (
It consists of a recording signal processing section with M(N), a reproduction demodulation section, an error correction section, and a digital-to-analog conversion section for one channel, and the maximum number of channels to be reproduced simultaneously L (L (N), a recording switching circuit that selects a desired recording head from H recording heads and connects it to the recording signal processing section, and selects a desired reproduction head from N reproduction heads. 1. A multi-channel digital recording/reproducing apparatus comprising: a reproduction switching circuit connected to the reproduction signal processing section; and a signal switching control circuit controlling selective connection by the recording switching circuit and the reproduction switching circuit.