JPH06253247A - Magnetic recorder and magnetic recording/reproducing device - Google Patents

Abstract

PURPOSE:To simplify the configuration by providing a recording audio signal processing unit applying at least time axis compression to an input audio signal relating to plural programs and obtaining plural time division audio signals through modulation and an audio signal recorder recording the plural time division recorded audio signal to plural audio signal areas by using a same magnetic head. CONSTITUTION:First L, Rch audio signals cc, dd and 2nd L, Rch audio signals ee, ff are fed to a coder 14 via A/D converters 10-13. The coder 4 is controlled by a 1st recording control signal 16a to synthesize the inputted L, audio signals to apply coding to the signal obtained through time axis compression. Then a modulator 15 applies modulation to an output signal of the coder 14 and the obtained time division recording audio signal is applied to recording amplifiers 17, 18 controlled 2nd and 3rd recording control signals 6b, 16c by using the same magnetic head. Thus, the device configuration is simplified.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording device and a magnetic recording / reproducing device, and is particularly suitable for recording video signals and audio signals relating to a plurality of programs.

[0002]

2. Description of the Related Art In a conventional VTR, as a method for recording two video signals on a magnetic tape, two signals are recorded on two adjacent tracks formed by using a rotary head.
There has been known a method of simultaneously recording video signals according to a program (for example, Japanese Patent Laid-Open No. 59-104703).

[0003]

However, there are cases where it is desired to record not only two types of video signals but also audio signals with high quality. Further, there are cases where it is desired to record two types of video signals and audio signals with one program at a time with a configuration as simple as possible.

Therefore, the present invention aims to solve such a problem.

[0005]

The present invention provides the following configurations in order to solve the above problems.

A magnetic recording / reproducing apparatus for recording input video signals and input audio signals according to a plurality of programs in a plurality of video signal recording areas and a plurality of audio signal recording areas on a magnetic recording medium. Video signal recording means for at least modulating an input video signal related to a program and recording the video signal in each of the plurality of video signal recording areas; Recording audio signal processing means for obtaining a time-division recording audio signal, and audio signal recording means for recording the plurality of time-division recording audio signals respectively in the plurality of audio signal recording areas using the same magnetic head. A magnetic recording device characterized by:

A magnetic recording / reproducing apparatus for recording / reproducing an input audio signal and an input video signal according to a plurality of programs in a plurality of audio signal recording areas and a plurality of video signal recording areas on a magnetic recording medium. Video signal recording means for at least modulating the input video signal according to the program and recording the video signals in the plurality of video signal recording areas, respectively, Recording sound signal processing means for obtaining time-division recorded sound signals, and sound signal recording means for respectively recording the plurality of time-division recorded sound signals in the plurality of sound signal recording areas using the same magnetic head. Video signal reproducing means for demodulating at least the signal reproduced from the video signal recording area to obtain output video signals according to the plurality of programs,
A magnetic recording / reproducing apparatus comprising: an audio signal reproducing unit for at least demodulating a signal reproduced from the audio signal recording area and expanding the time axis to obtain output audio signals according to the plurality of programs.

[0008]

1 is a block diagram of a magnetic recording apparatus according to an embodiment of the present invention, FIG. 2 is a timing chart for explaining FIG. 1, FIG. 3 is a conceptual diagram for explaining frequency allocation, and FIG. Is a plan view for explaining the arrangement of the magnetic heads on the rotary drum, FIG. 5 is a conceptual view for explaining the magnetic tape pattern, and FIG. 6 is a block diagram of a magnetic reproducing apparatus according to an embodiment of the present invention. is there. Embodiments will be described below with reference to the drawings. The outline of the present embodiment is that a track for audio signals and two tracks for video signals are provided, and when two programs are simultaneously recorded, two kinds of audio signals are time-axis compressed and PCM-modulated to obtain recorded audio. A signal is time-multiplexed and recorded on one track for the audio signal, and when two programs are recorded with a time difference, a recorded audio signal according to the first program is provided on one track for the audio signal. After recording in the recording area of the second recording medium, a recording sound signal relating to the second program is provided on the track for the sound signal.
Is recorded in the recording area of. In the present embodiment, the recording modes are the first and second program simultaneous recording modes for simultaneously recording the first and second programs, and only the first program is recorded prior to the second program. There are a first program recording mode and a second program recording mode in which the first program is pre-recorded and then the second program is recorded later with a time difference.

To describe a magnetic recording apparatus for recording two kinds of video signals and audio signals according to two programs with reference to FIG. 1, first, a video signal recording system will be described. In the figure, first and second video signals aa and b are transmitted from a transmission line (not shown).
b is supplied to the first and second recorded video signal processing means AA and BB. Here, the first and second recorded video signal processing means A
Since both A and BB have the same configuration, the description of the second recording video signal processing means BB will be omitted.

The first video signal aa is separated into a luminance signal and a chrominance signal by the YC separation means 1 composed of a comb filter or the like, and then the TCI conversion means 2 is passed through an A / D converter (not shown). Is supplied to. The TCI converting means 2 compresses the luminance signal and the chrominance signal on the time axis, respectively, and then supplies the TCI signal obtained by time-multiplexing the both signals to the emphasis means 3. The emphasis means 3 is for reducing triangular noise associated with FM recording / reproduction, and emphasizes the high frequency components of the TCI signal. Then, the output signal of the emphasis means 3 is FM-modulated by the FM modulation means 4 and becomes a first recording video signal 4a having a frequency band described later. Similarly, the second recorded video signal processing means BB outputs the second recorded video signal 4b.

Then, the first and second recorded video signals 4a,
4b is a recording amplifier (not shown), which is amplified to a predetermined level, and then is passed through a rotary transformer to the magnetic heads A1 and A2.
And supplied to the magnetic heads B1 and B2 and recorded on the magnetic tape T.

Next, an audio signal recording system will be described.
Here, the first L and Rch related to the first video signal aa
An example will be described in which the audio signals cc and dd and the second L and Rch audio signals ee and ff related to the second video signal bb are recorded by PCM.

The first L and Rch audio signals cc and dd and the second L and Rch audio signals ee and ff are transmitted from a transmission line (not shown).
And are supplied to the encoding means 14 via the A / D converters 10 to 13. This encoding means 14 is controlled by a first recording control signal 16a, which will be described later, and is input to L and Rch.
Well-known encoding such as Reed-Solomon encoding is performed on the signal obtained by synthesizing the audio signal and compressing it on the time axis. And
The modulator 15 outputs a 4-phase PS to the output signal of the encoder 12.
Recorded audio signal 1 obtained by modulation such as K or EFM
5a will be described later with second and third recording control signals 16b, 16
It is supplied to the recording amplifiers 17 and 18 controlled by c.

The operation of the recording control means 16 corresponding to each recording mode will be described with reference to FIG. FIG. 6A shows a drum flip-flop signal 16d which is supplied to the recording control means 16 and which is synchronized with the rotation of the rotary drum. The duty ratio of the drum flip-flop signal 16d is 50%, and the rising edge or the falling edge is the magnetic head C1. , C2, and the magnetic head C1 is attached to the magnetic tape during the low level period and the magnetic head C during the high level period.
2 is attached to the magnetic tape.

Then, the drum flip-flop signal 16d and the mode discrimination signal 16e indicating the kind of the recording mode.
The recording control means 16 generates the first to third recording control signals 16a to 16c based on the above.

Here, the first recording control signal 16a controls the encoding means 14 so as to perform the encoding during the low level period, and in the case of the first program recording mode, as shown in FIG. It is a signal that rises in synchronization with a rising edge or a falling edge of the drum flip-flop signal 16d, maintains a high level for a quarter period of the drum flip-flop signal 16d, and then falls. And
The encoding means 16 makes the first L, Rch during the period of "T1".
A signal obtained by encoding the audio signals cc and dd is output.

Further, in the case of the second program recording mode, the first recording control signal 16a is an inverted version of FIG. 7B as shown in FIG. Then, the encoding means 16 outputs a signal obtained by encoding the second L, Rch audio signals ee, ff during the period "T2".

Further, in the case of the first and second program recording modes, the first recording control signal 16a is always a low level signal (not shown), and the encoding means 16 has the above-mentioned T.
The first L and Rch audio signals cc and dd in the periods 1 and T2.
And the second L and Rch audio signals ee and f
and a signal obtained by encoding f is output.

As described above, the encoding means is the first L, Rch.
The audio signals cc and dd and the second L and Rch audio signals ee,
After ff and ff are respectively compressed on the time axis, the coded signal is time-division multiplexed to obtain a recorded voice signal 15s.

Next, the second and third recording control signals 16b and 16c for controlling the recording amplifiers 17 and 18 will be described. First, in the case of the first program recording mode, the second and third recording control signals 16b and 16c are as shown in FIG.
The signal shown in (E) is obtained, and as a result, the recording amplifier 1
7, 18 are magnetic heads C1, only during the period of T11, T12.
Supply a signal to C2.

In the second program recording mode, the second and third recording control signals 16b and 16c become the signals shown in FIGS. 4F and 4G, and the recording amplifiers 17 and 18 are thereby set. Signals are supplied to the magnetic heads C1 and C2 only during the periods T21 and TQ2. Further, in the case of the first and second program recording modes, the second recording control signal 16b
Is the drum flip-flop signal 1 shown in FIG.
6d is the same signal, while the third recording control signal 1
6c is a signal obtained by inverting the signal 16d.

Now, referring to FIG. 3, the recorded voice signal 1
5A and the first and second recorded video signals 4a and 4b, the frequency allocation relationship will be described. FIG. 5A shows the frequency allocation of the recorded audio signal 15a, which is a carrier frequency of 4 MHz. Centered around ± 2MH
The z band is the frequency allocation. On the other hand, FIG. 2B shows the frequency allocation of the first and second recorded video signals 4a and 4b, and both have the same frequency allocation. That is, both signals occupy the frequency band from 2 MHz to 16 MHz by the deviation in which the sync tip level is 8 MHz and the white peak level is 10 MHz.

The first and second video signals aa and bb and the recording audio signal 16a thus obtained are respectively amplified to a predetermined level by a recording amplifier, and then are amplified on a rotary drum via a rotary transformer. Magnetic head A arranged in
1, A2, magnetic heads B1, B2 and magnetic head C1,
The signals are supplied to C2 and the predetermined signals are recorded on the magnetic tape T.

Here, the arrangement of the magnetic heads on the rotary drum will be described with reference to FIG. As shown in FIG. 1A, magnetic heads C2, D2, A2 having reverse azimuth angles at positions 180 degrees opposite to the magnetic heads C1, D1, A1, B2.
B1 is attached. Then, the recorded audio signal 15
The azimuth angles of the magnetic heads C1 and C2 for recording a are, for example, +30 degrees and −30 degrees, and the azimuth angles of the magnetic heads A1 and A2 for recording the first recording video signal 4a are, for example, +15 degrees. , -15 degrees, and the azimuth angles of the magnetic heads B2, B1 for recording the second recording video signal 4b are, for example, -15 degrees and +15 degrees. Predetermined signals are recorded in the order of the illustrated drum rotation direction in FIG. The magnetic head D shown in FIG.
Reference numerals 1 and D2 are magnetic heads for post-recording of audio signals and have a head width substantially the same as the track pitch of the audio signal dedicated tracks.

Here, the magnetic head C will be described with reference to FIG.
The height relationship between 1, D1, A1 and B will be described. The magnetic heads C2, D2, A2, and B1 have the same height relationship, and thus the description thereof is omitted. Further, it is assumed that the track pitches of the audio signal and the video signal are 19 μm, respectively. In FIG. 3B, the head width of the magnetic head C1 is 27 μm.
m and 8 μm below the audio signal track TC
It is protruding. After that, the center of the post-recording magnetic head D1 is arranged so as to coincide with the center height of the magnetic head C1. On the other hand, the magnetic heads B2 and A1 for video signals are composed of double azimuth heads,
It is arranged so that the lower edge of the audio signal dedicated track coincides with the upper edge of the magnetic head B2.

The tape pattern formed by the magnetic head arrangement shown in FIGS. 9A and 9B is shown in FIG.
And FIG. 5 will be described. First, the case of the first and second program simultaneous recording modes will be described with reference to FIG. 4 (C). The magnetic head C1 extends over the video signal track shown by the diagonal lines in FIG. 4 to record the recording audio signal 15a. However, the shaded portion is erased on the right side by the following magnetic head B2, and finally the track TC dedicated to audio is formed. It should be noted that the reason why it does not extend to the left side is to consider the case of the second program recording mode.

In this way, the track pattern is formed by the width of the magnetic head for the video signal. Further, in self-recording / reproducing in which recording / reproducing is performed using the same magnetic head, even if there is track bending, the same track as in recording can be reproduced. It does not run over the signal-only track. Therefore, a signal with a good S / N without crosstalk can be reproduced by the magnetic head for video signals.

Next, the case of the first program recording mode will be described with reference to FIG. In such a case, the illustrated track is recorded and formed. That is, the magnetic heads A1, A
2, the video signal recording tracks TA1 and TA2 are formed, and the recording related to the first L and Rch audio signals cc and dd is performed by using the magnetic heads C1 and C2 in a portion surrounded by a thick frame in the audio dedicated track TC. The audio signal 15a is recorded. At this time, as shown in FIG.
Since 1 and C2 are recorded so as to extend only to the substantially right side of the audio-only track, the already recorded video signal recording tracks TA1 and TA2 are not erased. It goes without saying that the magnetic heads D1 and D2 for after-recording having the same track width as the above-described audio-only track may be used.

The case of the second program recording mode will be described with reference to FIG. In such a case, the illustrated track is recorded and formed. That is, the magnetic heads B2, B
1, the video signal recording tracks TB2 and TB1 are formed, and the recording related to the second L and Rch audio signals ee and ff is performed by using the magnetic heads C1 and C2 in the portion surrounded by the thick frame in the audio dedicated track TC. The audio signal 15a is recorded. Also at this time, as shown in FIG. 4A, since the magnetic heads C1 and C2 perform recording by protruding only to the substantially right side of the audio-only track, the already recorded video signal recording tracks TA1 and TA2 should be erased. The magnetic head B, which is recorded on the video signal recording tracks TB1 and TB2, is recorded on the magnetic heads C1 and C2.
Since the data is re-recorded at 2 and B1, the track shown in FIG.

In the first program recording mode, every other audio-only track TC is formed as shown in FIG. 7C, and in the second program recording mode, it is shown in FIG. As described above, the unrecorded audio-dedicated tracks TC may be formed every other one in the first program recording mode.

Since the recording areas of the recorded audio signal 15a according to the first program and the recorded audio signal 15a according to the second program are made different in this way, the first and second programs can be performed simultaneously or with a time difference. It can be recorded in advance.

Next, the magnetic reproducing apparatus will be described with reference to FIG. A signal reproduced from the magnetic tape T using the magnetic heads A1 and A2 and the magnetic heads B2 and B1 is supplied to a preamplifier (not shown) through a rotary transformer (not shown), amplified to a predetermined level, and then output signal thereof. The first
It is supplied to the second reproduced video signal processing means CC and DD. Since the first and second reproduction video signal processing means CC and DD have the same configuration, the description of the second reproduction processing means CC will be omitted.

FM in the first reproduced video signal processing means CC
The output signal of the preamplifier is supplied to the demodulation means 20, and the FM demodulated signal is supplied to the de-emphasis means 21 having a complementary relationship with the above-mentioned emphasis means to suppress triangular noise peculiar to FM transmission. It is supplied to the TCI inverse conversion means 22 having a complementary relationship with the TCI conversion means 3 via an A / D converter (not shown).

Then, the TCI inverse conversion means 22 supplies the YC synthesizing means 23 with the reproduction luminance signal and the reproduction color signal obtained by expanding the compressed color signal and the compressed luminance signal related to the reproduced TCI signal. Then, the first output video signal gg obtained by combining the two by adding them is supplied to a transmission line (not shown). Similarly, the second reproduced video signal processing means DD outputs the second output video signal hh to a transmission line (not shown). On the other hand, in the audio signal reproducing system, a signal reproduced from the magnetic tape T by using the magnetic heads C1 and C2 is supplied to a preamplifier (not shown) through a rotary transformer (not shown) and is amplified to a predetermined level.
The output signal is supplied to the demodulation means 31 through the bandpass filter 26 for extracting the frequency components of ± 2 MHz with the output signal having a center frequency of 4 MHz.
Then, the bandpass filter 26 is generated by the demodulation means 31
Signal obtained by performing 4-phase PSK or EFM demodulation on the output signal of 1 is subjected to well-known decoding such as Reed-Solomon decoding by the decoding means 32.
The i, jj and the second L, Rch output audio signals kk, 11 are output to a transmission line (not shown) via the D / A converters 31-34.

In this way, the first output video signal gg and the first L, Rch output audio signals ii, jj according to the first program and the second output video signal gg and the second output video signal gg according to the second program. 2 L, Rch output audio signals kk, l
l can be replayed simultaneously or either.

In the above-described embodiment, a bias signal (for example, a 12 MHz sine wave) is added to the recording audio signal 15a.
Of course, it is also possible to multiplex.

In the above-described embodiment, if a high definition video signal such as a high-definition signal or an EDTV signal is divided and input as the first and second video signals and combined when being output, a high definition will be obtained. The video signal and the conventional video signal (for example, N
It is needless to say that the recording / reproducing can be performed by using both the TSC signal and the PAL signal).

In the above embodiment, in order to make it compatible with the conventional home VTR, a well-known VHS system or S-VHS system configuration may be added to the configuration of the above embodiment. In that case, the configurations 10, 11, 14,
Needless to say, the magnetic heads C1 and C2 may be used together with 15, 17, 18, 26 to 32.
In the above-mentioned embodiment, it goes without saying that the recorded audio signal 15a may be an information signal.

In the above embodiment, the case where the signals relating to the first and second programs are recorded and reproduced has been described, but it is also possible to record and reproduce three or more kinds of programs. In this case, the number of video signal tracks may be increased according to the type of the program, the frequency band of the recording audio signal 15a may be expanded, and the recording area of the audio-only track may be further divided. Of course, it may be combined with a method of frequency-multiplexing an audio signal. Further, it goes without saying that the video signal may be compressed and recorded in different recording areas on the recording medium.

In the above embodiment, the magnetic recording device and the magnetic reproducing device have been described for the sake of convenience, but it goes without saying that the magnetic recording device and the magnetic reproducing device may serve as both.

[0041]

As described above, according to the configuration of the magnetic recording apparatus of the present invention, in particular, a plurality of time-division recording audio signals obtained by compressing and modulating the input audio signals according to a plurality of programs at least on the time axis. And a sound signal recording means for respectively recording the plurality of time-division record sound signals in the plurality of sound signal recording areas by using the same magnetic head. Since the same input head can record the input audio signal in common, the structure can be simplified, and the input audio signals related to a plurality of programs are time-divided into the audio signal recording area on the magnetic recording medium. Since the recording is performed as described above, there is an effect that the utilization efficiency of the magnetic recording medium can be improved.

As described above, according to the configuration of the magnetic recording / reproducing apparatus of the present invention, in addition to the above-mentioned effects, there is an effect that it is possible to reproduce video signals and audio signals relating to a plurality of programs.

[Brief description of drawings]

FIG. 1 is a block diagram of a magnetic recording apparatus according to an embodiment of the present invention.

FIG. 2 is a timing chart for explaining FIG.

FIG. 3 is a conceptual diagram for explaining frequency allocation.

FIG. 4 is a plan view for explaining the arrangement of magnetic heads on a rotary drum.

FIG. 5 is a conceptual diagram for explaining a magnetic tape pattern.

FIG. 6 is a block diagram of a magnetic reproducing apparatus according to an embodiment of the present invention.

[Explanation of symbols]

15a Recorded audio signal (time division recorded audio signal) aa, bb First and second input video signal (input video signal) cc, dd First L, Rch input audio signal (input audio signal) ee, ff Second L, Rch input audio signal (input audio signal) gg, hh 1st, 2nd output video signal (output video signal) ii, jj 1st L, Rch output audio signal (output audio signal) kk, ll 2 L, Rch output audio signal (output audio signal) C1, C2 magnetic head (magnetic head) T magnetic tape (magnetic recording medium) TC audio track (audio signal recording area) TA1, 2, TB1, video signal recording Track (video signal recording area)

Claims (2)

[Claims] 1. A magnetic recording / reproducing apparatus for recording input video signals and input audio signals according to a plurality of programs in a plurality of video signal recording areas and a plurality of audio signal recording areas on a magnetic recording medium. Video signal recording means for at least modulating input video signals according to a plurality of programs and recording the video signals in the plurality of video signal recording areas, and at least compressing and modulating the input audio signals for the plurality of programs along the time axis. Recording sound signal processing means for obtaining a plurality of time division recording sound signals, and sound signal recording means for recording the plurality of time division recording sound signals respectively in the plurality of sound signal recording areas using the same magnetic head. A magnetic recording device having: 2. A magnetic recording / reproducing apparatus for recording / reproducing input audio signals and input video signals according to a plurality of programs to a plurality of audio signal recording areas and a plurality of video signal recording areas on a magnetic recording medium, Video signal recording means for at least modulating the input video signals according to the plurality of programs and recording the video signals in the plurality of video signal recording areas respectively, and at least compressing and modulating the input audio signals according to the plurality of programs along the time axis. Recording sound signal processing means for obtaining a plurality of time division recorded sound signals, and sound signal recording means for respectively recording the plurality of time division recorded sound signals in the plurality of sound signal recording areas using the same magnetic head. Video signal reproducing means for at least demodulating signals reproduced from the plurality of video signal recording areas to obtain output video signals according to the plurality of programs, and the audio signal recording means. A magnetic recording / reproducing apparatus comprising: an audio signal reproducing means for at least demodulating a signal reproduced from the area and expanding the time axis to obtain output audio signals according to the plurality of programs.