JPS60127569A - Multitrack magnetic record reproducing device - Google Patents

Abstract

PURPOSE:To enable use of a magnetic tape obtained by another record reproducing device by a device and enable recording that can be reproduced by other device by giving interchangeability in record reproducing function between upper class device and lower class device having no interchangeability. CONSTITUTION:For instance, when reproducing from a magnetic tape recorded in 8 tracks (upper class device), sum L+R and difference L-R of two signals, LCH and RCH, are recorded alternately. Accordingly, it is enough to change to a circuit a reproducing head b which corresponds to all tracks and start playing to reproduce. The reproduce from a tape recorded by a lower class device, reproduction of signals can be made easily by changing to a reproducing head c. However, as only a reproducing head corresponding to L+R operates, reproduction is made as monaural signals. Thus, signals can be reproduced from a magnetic tape recorded by a lower class device, and at the same time, signals can be reproduced easily from a magnetic tape recorded by an upper class device.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a multi-track magnetic recording and reproducing apparatus that converts audio stereo signals into digital signals and records and reproduces them on a magnetic tape.

<Prior Art> In stereo signal recording using the conventional multi-track system, emphasis was placed on faithful reproducibility of audio, and the number of racks was increased to reproduce 9.4 ff of high-density information signals.

Therefore, although it is advantageous for improving sound quality (1), the only thing that can be used with a single magnetic recording/reproducing device is the one recorded by that device, or the one made by an equivalent or lower grade. It was limited to magnetic tapes that were recorded by the device, and it was impossible to use magnetic tapes with more tracks than the playback head in handheld devices, so it lacked versatility and could not be used to its full potential. In addition, the larger the number of tracks, the smaller the track pitch, the more complex the circuit configuration, and the higher the mechanical precision required, posing various problems in terms of functionality and manufacturing.

<Objective of the Invention> An object of the magnetic recording/reproducing apparatus of the present invention is to provide compatibility with various types of tapes by providing two types of recording/reproducing heads with different numbers of tracks.

<Structure of the Invention> The magnetic recording/reproducing device of the present invention has a recording/reproducing head with two types of normal track pitch and double rack pitch, and each track of the recording head has two channels of stereo signals. The sum and difference digital signals are alternately recorded, or only one of these signals is recorded.

<Example> The magnetic recording/reproducing apparatus of the present invention will be explained in detail below with reference to the drawings. First, the one shown in FIG. 1 is for a class 1 device and has an 8-trunk magnetic head. In the figure, (a) shows the recording head, (b) shows the playback head that captures the signal recorded by a high-end device with a large number of tracks, and c) shows the signal recorded by a low-class device with a small number of tracks. This shows a reproducing head that captures a signal.The recording head (a) has the sum of the signals from the L channel and the signal from the R channel, and the difference of 1. ．． - R is recorded, and each track is provided with tracks C, , C2...C8 for detecting error signals, and each track is equipped with a playback head for the advanced device. (1)) and at the same time the sum of the signals of both channels 1. +R,,L+R2
. . . The playback function F(c), which captures the signal from the Hiboku-class device, is made to correspond only to the trunk that recorded the...

Next, the one shown in Figure @2 is 4, which has a small number of recording tracks.
) This shows the case of a rack, and is configured in the same way as in "-".

That is, the recording head shown in (a) has four tracks,
A recording head that can record only the sum L+R, , I, +R2, etc. of signals from the 14 channels and the R channel corresponding to each track, and a track C that detects error signals corresponding to each track of the head. , , C2 . . . , and 111T of each recording head has a size that spans two tracks of both channels R+L and R-1- shown in Figure #1.

Furthermore, (1) and (c) have exactly the same configuration as in Figure 1, and P shown in Figures 1 and 2 is corrected by 1 for the sum L + R of the signals from both channels. Q
is a track that corrects only the difference L-R between the signals of both channels.

<Function> The present invention has been described above, but if a magnetic tape recorded with 8 tracks (high-end fft) is to be played back, each track link on the magnetic tape will have vJ.
As shown in Figure 1, the sum L+R and difference L-R of the two signals of the L channel and R channel are recorded alternately, so to play this, the playback heads (I) corresponding to all trunks are used. ) and start playing. Also, to play back signals from a recording tape recorded with a low-grade device, you can easily reproduce the signal by switching from playback head (b) to (C). I can figure it out. ngchi playback head (
In the case of reproduction according to C), as is clear from the drawing, only the reproduction head corresponding to the sum L+R of both channels, that is, the L channel and the R channel, acts, so it is reproduced as a monaural signal, and data correction is performed by both channels. 1
= + Since the R and L-R tracks are different and separated, this can be done without any hindrance, and recording can be done by performing the reverse operation.

Next, in the case shown in Fig. 2, when a signal is played back from a magnetic tape recorded by a low-grade device, when the playback head (c) is operated, the playback signal is in the form of R, that is, the signal of both channels. In addition, when playing back using a magnetic tape recorded by a -1 second grade device, the signals from adjacent knee) tracks are the same, so this can be expressed as shown in Figure 1. When input to a 7-ohm playback circuit, it is not a signal for each channel, but a sum of 1. +
Since the R signal and the zero signal are taken out, (2) unless an operation is performed to separate the channel and the R channel, the reproduction output of L + R will be 1:1 from both reproduction heads (b).

As is clear from the above, it is possible to reproduce signals from magnetic tape recorded with low-grade equipment, and
It is also possible to easily reproduce signals from magnetic tapes recorded with advanced equipment.

<Effects of the Invention> The multi-trunk magnetic recording and playback device of the present invention allows recording and playback functions to be made compatible between a high-level device and a low-level device, which were previously incompatible, so that a single device can perform the following functions. It enables the use of magnetic tape obtained with another recording/playback device, and it also enables recording that can be played back on other devices, which does not extend the scope of use and is economical for the user. Moreover, it is a highly practical idea that can be realized without requiring any particularly advanced technology in manufacturing, and it is extremely easy to change the use of the above-mentioned device.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram showing the relationship between the recording tracks used in a class 1 multi-track magnetic recording and reproducing device and a reproducing head, and Fig. 2 is a schematic diagram showing the recording tracks used in a lower class multi-track magnetic recording and reproducing device. FIG. 3 is a schematic diagram showing the relationship between the and the playback head. a...Recording head, b+c...Playback y Applicant: Sharp Corporation +1 Agent: Harumi Suzuki

Claims (1)

[Claims] In a recording head that converts a stereo audio signal into a digital signal and records and reproduces it on multiple tracks, the sum and difference of the L channel and R channel of the stereo signal or one channel of the stereo signal is alternately recorded and reproduced for each recording track. a recording head; (1) a recording head having a width spanning two adjacent tracks on which the sum and difference of the − channel and the R channel are recorded, and capable of recording only the signal of the sum of the L channel and the R channel; 1 from multiple tracks in which the sum and difference of 15 channels and R channel are recorded alternately.
A multi-track magnetic recording and reproducing device comprising a reproducing head that reproduces only the sum of both channels in addition to the track.