JPS62257292A - Multiplex information signal recording and reproducing method and its recording device - Google Patents

Abstract

PURPOSE:To record and reproduce a video signal in a wide frequency band as keeping the interchangeability with an existing reproducing device by frequency-coverting the high frequency component of a video signal to a higher frequency band, arranging a modulated information signal in a frequency band generated between said component and the low frequency component to multiplex it. CONSTITUTION:A color video signal is separated into a luminance signal and a carrier chrominance signal by a comb-line filter 2, and the low frequency component of the luminance signal taken out by a LPF 3 is added with a low band convertion carrier chrominance signal by an adding circuit 5. The high frequency component of the luminance signal taken out by a HPF 4 is subjected to a balanced modulator 7, a BPF 17, a balanced modulator 18, and a LPF 19 to be frequency-converted to a higher band. Consequently, a signal outputted from an adding circuit 20 to a terminal 23 comes to be a frequency division multiplex signal consisting of a band-sharing multiplexing signal made of a luminance signal low frequency component YL from the adding circuit 5 and a low frequency carrier chrominance signal CR, a high frequency converted luminance signal higher component YH' from the LPF 19, and the FM sound signals of two channels A1 and A2 positioned in the frequency area between above two signals.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a method for recording and reproducing a multi-channel information signal and a recording apparatus, and more particularly to a recording apparatus for recording a video signal. The present invention relates to a handcart information signal recording and reproducing method for multiplexing an I signal and an audio signal, recording the same on a recording medium, and reproducing the same, and a recording apparatus therefor.

Conventional Technology When recording a video signal and an audio signal on a recording medium and reproducing them, various multiplexing means are used. 5
Publication No. 8-23998 (Patent IK (52-25262@
＞ [Information signal recording method] disclosed in 1986-29
``Information signal recording and reproducing method'' disclosed in Publication No. 031 (Patent No. 1 and No. 158-5541), and furthermore,
1 disclosed in Publication No. 032 (Japanese Patent Application No. 58-5542)
``Information signal reproducing device'' is known.

These band-sharing multiplexes a luminance signal limited to band Ll+ and a low-pass converted carrier chrominance signal in the high frequency part of the luminance signal limited to band i+11, and further adds the luminance signal to this band-sharing multiplexed signal. − for frequencies higher than the upper limit frequency of the signal
Or frequency modulation (FM) of two or more carrier waves with an audio signal
, frequency division multiplex the blue FM audio signal, frequency modulate one carrier wave with this frequency division multiplexed signal, record the obtained FM signal on a recording medium, and reproduce the FM from this recording medium.
A method of playing back signals by performing signal processing that is the reverse of that used when recording.

Or a playback device.

According to the recording method, recording/playback method, and playback device disclosed by the present applicant, even if the distortion in the transmission system is relatively large, beat interference will not occur in the demodulated video signal due to the single carrier characteristic. In addition to being able to record and reproduce a luminance signal, one color feed signal, and an audio signal of a -channel or a digital channel or higher on the same track without any need for recording, it also has various other excellent features.

For this reason, a capacitance ω change reading detection type video disk called V)ID (registered trademark) recorded using the information signal recording method proposed by the present applicant, and a video disk based on this video disk recorded by the information signal recording method proposed by the present applicant. A video disk reproducing apparatus that demodulates and reproduces a color pre-visualized signal based on the information signal reproducing apparatus of B.5 is currently in practical use and is widely referred to in general.

Problems to be Solved by the Invention By the way, among the information signals recorded and reproduced by such a method, the frequency band of the band-limited luminance signal is
When attempting to widen the image for the purpose of increasing the brightness, the frequency of the above-mentioned brightness signal is To increase the bandwidth, these F
You can either avoid recording the MR voice signal from the beginning or move it to another frequency location.

However, with this information recording method, since recorded video discs and video disc playback devices already exist in Dainae, it is difficult to maintain compatibility with these existing recorded video discs. 1, it is not possible to move the recording frequency position of the FM audio signal or stop recording of the FM audio signal itself.

The present invention has been created in view of the above points, and is capable of recording and reproducing video signals over a wide band while maintaining compatibility with a reproducing device that exclusively reproduces existing recorded recording media. An object of the present invention is to provide a signal recording/reproducing method and a recording device thereof.

Means for Solving the Problems The multiplexed information signal recording and reproducing method of the present invention frequency-converts the video signal m-range components to a high frequency range, and converts the frequency-converted video signal from the upper limit frequency of the low-range components to the upper limit frequency of the video signal. One or more modulated information signals arranged in an empty frequency region up to the lower limit frequency of the m-signal high-frequency component, the video signal low-frequency component, and the frequency-converted video signal high-frequency component are frequency-divided, respectively. After multiplexing, one carrier wave is frequency modulated and recorded on a recording medium,
During playback, the low frequency component of the video signal is obtained from the frequency modulated signal obtained by frequency demodulating the signal played back from the recording medium.

The frequency-converted high-frequency component of the video signal and the modulated information signal are discriminated and separated, and the reproduced video signal and the reproduced information signal are respectively generated from the discriminately separated signals.

Further, the multiplexed information signal recording device of the present invention includes a filter circuit that outputs a large amount of video signal high-frequency components and video signal low-frequency components, and a frequency conversion! It consists of an r stage, an adding means, and a recording means.

The nm wideband video signal is first divided into two, a video signal high frequency component and a video signal low frequency component, with a predetermined frequency as a boundary.

Next, only the divided video signal high frequency components are frequency converted to a high frequency range and shifted to a predetermined high frequency region. As a result, an empty frequency region is created between the video signal low-frequency component and the video signal high-frequency component whose frequency has been converted to a high frequency.

A frequency band is selected to occupy within this vacant frequency region - or two or more modulated information signals;
The above video signal low frequency component and i! ′! The high-frequency components of the video signal frequency-converted to the 1-band are extensively frequency-division multiplexed, frequency-modulated with one carrier wave, converted into a frequency-modulated wave signal, and recorded on a recording medium.

On the other hand, during reproduction, the frequency modulated wave signal reproduced from the recorded recording medium is frequency-modulated and returned to a reproduced frequency division multiplexed signal. After handling the above-mentioned - or two or more modulated information signals from this reproduced frequency division multiplexed signal, the frequency is converted to a lower frequency by the amount that the high-frequency component of the video signal that has been frequency-converted is shifted during recording. The video signal is then returned to the original band, and the visualized @8 band component that is returned to the next band is multiplexed with the reproduced video signal low frequency component separated from the reproduced frequency division multiplexed signal. As a result, the original wideband video signal is reproduced.

Here, by selecting the boundary frequency for frequency division and the frequency band of the multiplexed or two or more modulated information signals to be the same frequency band as the existing recording/reproduction method,
Even in the existing recording/reproducing method, it is possible to reproduce the above video signal low frequency component and/or two or more modulated information signals.

Further, in the multi-m information signal distribution device, the frequency conversion means converts the high frequency component of the video signal into the II band. The sieving means frequency-division multiplexes the high-frequency components of the video signal taken out from the frequency converting means and the low-frequency components of the video signal from the filter circuit, and arranges them in the frequency region where there is no space between them. Alternatively, two or more modulated information signals are also frequency-division multiplexed, and this frequency-division multiplexed signal is supplied to the recording means.

Thereby, this frequency division multiplexed signal is frequency modulated by the recording means and recorded on the recording medium.

Example Embodiments of the present invention will be described below with reference to the drawings and techniques.

FIG. 1 shows a block system diagram of an embodiment of the recording Vt position of the present invention and the recording system of the present invention method. For example, an N-r SC color video signal inputted to an input terminal 1 is supplied to a comb filter 2, where a luminance signal and a carrier color signal are separated into P waves.

The luminance signal waved by the comb filter 2 is
As shown in Fig. 2 (A), the frequency spectrum Y is shown.
It has a frequency band of 0 to 5.2 MH2, but this)
Also, the frequency band 11! of the band-limited 11'li Iff signal transmitted by the existing video disk recording and reproducing system mentioned above. ! (0-3MH7), it has a much wider band.

From this broadband luminance signal number, a low-pass filter (hereinafter referred to as PF) 3 with a cut-off frequency of 3 MHz and a cut-off frequency of 3 M l-I Z 1! ′! I area filter (hereinafter referred to as HP F) 4 is supplied with 3 MH
The frequency band is divided into two with z as the boundary frequency fM.

The low-frequency component of the luminance signal of the frequency spectrum as shown by Y in FIG. The same frequency band as the brightness signal (0
~3MHz> is supplied to the adder circuit 5, where the comb filter 2 converts the molecular Jf
The low frequency '9' obtained by converting the frequency into one region is added to C). This low-pass conversion 1li2 color sending signal has the same frequency band as the low-pass conversion carrying color 158 transmitted in the existing video disc recording 111 system described above.
Approximately 2.56MH2±500kll Z is selected. .

However, the color subcarrier frequency of this low-pass converted carrier color signal is 3.57
9! It has a frequency of 5/718 of +45 M 1-lz (= f sc ), and is in a frequency interleaved relationship with the luminance signal. As a result, from the addition circuit 5, the luminance signal low frequency component and the above-mentioned low frequency conversion carrier color signal located in the high frequency region of this luminance signal low frequency component are more easily outputted from the addition circuit 5.
A band-sharing multiplexed signal is extracted.

On the other hand, in Figure 2 (C) extracted from HP F 4, Y
) The high-frequency component of the frequency spectrum i.lamb.25 is supplied to a balanced modulator 7, where it balancedly modulates the local 4-triator generated in the following manner. To explain the method of generating this local carrier, the synchronization signal separated and extracted from the wideband luminance signal by the synchronization signal separation circuit 8 is supplied to the earthenware 9 in the form of a gate pulse to the berth I, where it is converted into the berth 1-gate pulse. The converted signal is supplied to the burst gate circuit 10.

The burst gate circuit 10 separates and extracts only the color burst signal from the input NTSC color video signal using the burst gate pulse described above, and separates and extracts only the color burst signal from the input NTSC color video signal.
The signal is supplied to the loop (PLL) 11. This allows the PLL
From 11 onwards, the color subcarrier frequency f', which is phase-opened to the color burst signal in the human-powered NTSC two-dimensional video signal, is
A continuous wave 41 having the same frequency as sc is generated and supplied to the terminal 12a of the switch circuit 12.

The other terminal 12b of this switch circuit 12 is supplied with the output electroforming 1 carrier wave frequency fsc of the reference oscillator from the input terminal 13. The continuous wave of frequency fSC taken out from the switch circuit 12 is supplied to frequency multiplier circuits 15 and 16 through a phase adjuster 14. The frequency multiplier circuit 15 multiplies the human input signal frequency f'sc by 3 and outputs 10.
A signal of 738B35 M t-1z is generated and supplied to the balanced modulator 7 as a first local carrier.

As a result, the balanced modulator 7 outputs the frequency of the sum of the two human input signal frequencies (13,74M l-1z~15°94M+-
17) signal and the difference frequency (5.24MHz to 7.7MHz)
18 of 4M117) are generated and outputted respectively, but 13.74M is generated by bandpass filter (hereinafter referred to as BPF) 17.
Only the signals in the frequency band from l-IZ to 15.94 MHz are converted into P waves, and all the frequency components in the range are removed as unnecessary frequency components, so only the signals in the above frequencies are sent to the balanced modulator 18. Supplied.

The balanced modulator 18 uses the frequency multiplier circuit 16 to multiply the color subcarrier frequency fsc by 19/7 to 11 times 9,7.
15908 M I-I Z signal to the second local
1-11 rear, and by balanced modulating this with the signal from BPF 17, the frequency of the sum of both human power signal frequencies (23.46 MHz to 25.66 MHz)
1z) belief? ] and the difference frequency < 4.02 Ml-1
z ~0.22 Mlll) are generated and output, respectively. The output signal of the balanced modulator 18 has a cutoff frequency, '
Melo has a slightly higher wave number than 22MH2 and PF19, as shown by YH' in Figure 2 (D), 4.02~
IH2 to G, 22 N++71 X· frequency signals are divided into 111tP waves and then supplied to the addition t1 circuit 20. That is, the signal of the frequency spectrum YH' is a high frequency component of the signal whose frequency is converted to a high frequency range.

Note that the first and second local −'I=v rears above have frequencies of 3 fsc and (19/7) fsc, and when the horizontal scanning frequency is multiplied by f + - +, it is an odd multiple of H/2. Since the frequency is selected as , there is a frequency interleave relationship with the 1Iili polishing signal, and the adverse effect on the reproduced video signal can be visually reduced.

In FIG. 1, the input terminals 21 and 22 have a first channel 11.
The FMg voice signal of the first channel with a frequency band of 3.43MH2±75kllz obtained by frequency modulating the carrier wave of 3.43MH7 with the voice signal of the channel, and the voice signal of the second channel are 3.73M LI Z FM blindness of the second channel of frequency band 3.73MH2±75kllz obtained by frequency modulating the carrier wave of
The signal is supplied to the additional circuit 20.

As a result, the signal output from the adder circuit 20 to the output terminal 23 is converted into a low-frequency component Y+- of the luminance signal from the adder circuit 5, as shown in the frequency spectrum shown in FIG. 2(E). W1 color sending signal CR, multi-+Q signal for bandpass, and L
High-frequency conversion r + degree multiplied signal high-frequency component H' from P F 19 and F M of the 2y tunnel located in the empty frequency region between those signals R7I: Frequency consisting of signals AI and A2 It becomes a small traffic light.

This frequency division wide signal is transmitted through a frequency modulator (shown in the figure).
J"), where one carrier wave is frequency modulated to obtain a predetermined carrier wave shift band (for example, the sync depth level is 6° IM HZ, the white peak level is 7.9M
After the signal is converted into an FM signal having a high frequency (Hz), it is supplied to a recording device using a known light beam, and recorded thereon by forming a spiral track on, for example, a disk.

Next, to explain the f73f\X of the reproduction system of the present invention,
FIG. 3 shows a block system diagram of an embodiment of the regeneration system of the present invention. In the figure, an input terminal 25 receives an FM signal reproduced from a recording so-called video disc A for FM demodulation. ! : A reproduced frequency-division multimodal signal with a frequency spectrum as shown in FIG. and the synchronizing signal separation circuit 32, respectively.

A+ in Figure 2 (E) by B P F 29 and 30
The FMG voice signals of the first and second channels of the frequency spectrum indicated by A2 are selected and extracted at frequency a, and are output to the output horn terminals 33 and 34.

In addition, the low frequency converted carrier color signal of the frequency spectrum shown by CR in FIG.
36, where it is frequency-converted to the original color-specific carrier frequency f s c (= 3.579!145 MI
IZ) is returned to the reproduced carrier color signal. Here, since the reproduced frequency υ1 multi-Φ signal is often accompanied by time axis fluctuations caused by the reproduction process, the frequency converter 36 is equipped with a known circuit for removing this time axis fluctuation. It goes without saying that This stabilized reproduced carrier color signal with time axis fluctuations removed is supplied to the passenger 7 circuit 38, where a cutoff frequency of approximately 3 MHz is applied.
111F waves are generated from the reproduced frequency division multiplexed signal by the F 26 and the comb filter 37, as shown in FIG.
E) to YLT: No frequency band O~3M) lz residing bright 1! It is added (multiplexed) with the low frequency component.

On the other hand, the synchronization signal separated and extracted from the Ir1111 signal separation circuit 324 is supplied to the pulse generator 39, where it is converted into a burst gate pulse and sent to the burst gate circuit 31.
JAL takes the color burst signal in the multi-signal signal for the playback frequency supplied to JAL. Pulse generation: S39 is also human power + Ij Ikuma Akii, ゛;
l l! II L, generate a pulse with a horizontal scanning period;
When this is supplied to PLL/11, error detection li
It is supplied to the d path 40.

21'2': The detection circuit 40 is the parse 1 to gate circuit 31
He comes intermittently every 1 water cycle! 16 Reproduction h Each input phase and pulse generation of rabur burst signal m 39 J
: Compare the phases of the pulses and output the phase error as PL.
L41 to reset the internal voltage controlled oscillator.

As a result, the PLL 41 is synchronized in phase with the horizontal scanning period pulses from the pulse generator 39, and adjusts the frequency at a timing such that the output signal phase of the balanced modulators 45 and 47, which will be described later, coincides with that during recording. Generates and outputs the 'f'sc signal. The output signal of this PLL41 has a phase adjustment of 4
2, I;' is supplied to 1 wave number multiplier circuits 43 and 44, where the frequency is multiplied by 19/7 and 3 and supplied as local 1-1/rea to balanced modulators 45 and 47, respectively. Therefore, this local chirelia is synchronized with the horizontal frequency III signal in the reproduced frequency division multiplexed signal υ1, and if the reproduced frequency division multiplexed signal includes a time axis error, it is faithful to the time axis error. follow.

The balanced modulation 345 is a reproduced luminance signal high-frequency component of the frequency spectrum shown as Y14' in FIG.
The local 4-1/rear of 715908 MHZ is balanced modulated and the sum frequency (13,74Ml-12~15.
13 of 94 Mllz) and the difference frequency (3,50H
llz ~ 5.70 MilZ) signal and BPF46
Generate and output to. The BPF'46 passes only the signal of this negative phase frequency and supplies it to the balanced modulator 47.

To this, the balanced modulator 47t, i is a signal with the sum of the frequencies of 10.738635 and 10.738635 from the frequency i multiplier circuit 44.
The MHZ local key 11 is balanced and modulated to generate and output a signal having a frequency of the sum and difference of the meat input signal frequencies to the LPF 48. L P F with cutoff frequency 5.5 MHz
48 is the difference frequency component of this input signal 3,
Only the high-frequency components of the luminance signal returned to the original band of 0 MHz to 2 MHz are converted into P waves and supplied to the addition circuit 38.

The additional circuit 38 is shown in FIG. 2 (B) from the comb filter 37.
The reproduced luminance signal high frequency component of the frequency spectrum as shown by YL in FIG. 2(C) and the frequency shown as Y)l in FIG. The reproduced luminance signal of the spectrum is multiplexed with the high-frequency component to obtain a wideband reproduced luminance signal as shown by Y in FIG. The carrier color signal is band-sharing multiplexed and outputted to the output terminal 50 as a reproduced NTSC color video signal.

Note that, like the recording system, the local carrier frequency in this embodiment is also selected to be an odd multiple of f'H/2, so that it is possible to visually reduce the cost of adverse effects on the reproduced image.

By the way, when the video disc recorded in this embodiment is played back by an existing playback device, the existing playback device will not be able to play the video disc recorded in this embodiment as shown in FIG.
E) k: YL, CR, A+ Since the circuit is configured to play back a video disc in which a multiplexed signal of the frequency spectrum of each signal indicated by Az is recorded, the circuit section surrounded by the broken line in Fig. 3 It consists of only 49 items.

Therefore, when a video disc recorded according to this embodiment is played back using an existing playback device, the high frequency component of the luminance signal is
? 13! Therefore, it is possible to reproduce multiplexed signals equivalent to those of conventional video discs.

Further, in the recording medium recorded according to the present invention, a code (IF number, for example, a specific position δ within the vertical blanking space) may be pre-recorded.
When this code signal is recorded in the reproducing system of the present invention and the code signal is reproduced, the entire circuit as shown in Fig. 3 is configured to operate. In contrast, by configuring so that only the circuit section 49 shown in FIG. 3 operates, it is also possible to reproduce existing recorded recording media using the reproduction system of the present invention.

Note that the present invention is not limited to the above-mentioned embodiments, and may be implemented by using information signals other than audio signals (for example, computer programs, facsimile transmissions, (and various other digital data) instead of audio signals, or It would be nice if it were recorded along with the angle signal.

In this case, there may not be L7 compatibility with the existing recording/reproducing system, but it is possible to record/IIf-produce a wideband video signal.

Furthermore, the recording medium is not limited to video discs, but also magnetic chips. Of course, it is also possible to use a digital recording medium such as an optical disk that can be replaced with a new one.

Effects of the Invention As described above, according to the present invention, video signals can be recorded and reproduced in a wider band than the existing recording+1j raw system according to the transmission band of the recording medium or the recording/reproducing device 7t, and the video signal While maintaining compatibility with existing recording and playback systems, where the band U1 is limited and other information signals (especially audio signals) are multiplexed and standardized within the video band, it is possible to record video signals in a wider band. , playback, high resolution, and other features.

[Brief explanation of drawings]

FIG. 1 shows an embodiment of the recording system and recording device of the present invention.
Block System Diagram, Figure 2 is a frequency spectrum diagram of signals of various parts for explaining the operation of the present invention, and Figure 3 is a block system diagram showing an embodiment of the reproduction system of the present invention. 1...Color video signal input terminal, 2.35.37...
・Comb filter, 3...Low pass filter (L P F
), 4...High-pass filter (HPF), 6.36...
Frequency converter, 7.18.45.47... Balanced modulator, 15.16.43.44... Frequency multiplier circuit, 20
゜38...Additional circuit, 21.22...FM audio signal input terminal, 23...Versatile No. 9 output terminal, 25...
・Reproduction frequency division multiplex signal input) J terminal, 26... Low-pass filter for separating low-frequency components of luminance signal (LPI, 27...
A bandpass filter (BPF) for separating n-band components is provided for the low-band component of the fd luminance signal, and 50... reproduced color video signal output terminal.

Claims (5)

[Claims] (1) Of the video signal high-frequency component and video signal low-frequency component obtained by dividing the frequency band of the video signal into two, the video signal high-frequency component is frequency-converted to a high frequency band, and the video signal low-frequency component is one or more modulated information signals placed in an empty frequency region from the upper limit frequency of the frequency-converted video signal to the lower limit frequency of the high-frequency component of the frequency-converted video signal, and the low-frequency component of the video signal and the frequency-converted A frequency division multiplexed signal is obtained by frequency-division multiplexing the high-frequency components of the video signal and then frequency-modulating one carrier wave and recording it on a recording medium, and at the time of reproduction, the signal reproduced from the recording medium is frequency-demodulated. The low-frequency component of the video signal, the high-frequency component of the frequency-converted video signal, and the modulated information signal are discriminated and separated from each other, and the frequency-converted high-frequency component of the frequency-converted video signal is frequency-converted. After returning the video signal to the high frequency component of the band, the video signal is multiplexed with the discriminatively separated low frequency component to obtain a reproduced video signal, and the discriminatively separated modulated information signal is demodulated to obtain a reproduced information signal. A method for recording and reproducing a multiplexed information signal, characterized in that the method comprises: (2) The video signal is a luminance signal, the modulated information signal is a frequency modulated audio signal, and the low frequency component of the luminance signal in the frequency division multiplexed signal is band-shared with a low frequency converted carrier color signal. 2. The multiplexed information signal recording and reproducing method according to claim 1, wherein the multiplexed information signal is multiplexed. (3) The frequency of the local carrier for obtaining the high-frequency components of the frequency-converted video signal during recording, and the frequency of the local carrier for frequency-converting the frequency-converted video signal to the original band during playback. respectively f_H/2(
2. The multiplexed information signal recording and reproducing method according to claim 1, wherein f_H is selected to be an odd number multiple of the horizontal scanning frequency of the video signal. (4) A filter circuit that divides the frequency band of the video signal into two and outputs a video signal high-frequency component and a video signal low-frequency component, respectively, and frequency converts the video signal high-frequency component from the filter circuit to a high frequency band. a frequency converting means for converting the frequency, a frequency-converted video signal high-frequency component from the frequency converting means, and a low-frequency component of the video signal from the filter circuit;
Frequency division multiplexing with one or more modulated information signals arranged in an empty frequency region from the upper limit frequency of the video signal low frequency component to the lower limit frequency of the frequency-converted video signal high frequency component. A multiplexing device comprising: an adding means; and a recording means for frequency-modulating one carrier wave with the frequency division multiplexed signal extracted from the adding means and recording the frequency-modulated wave signal obtained thereby on a recording medium. information signal recording device. (5) The video signal is a luminance signal, the modulated information signal is a frequency modulated audio signal, and the low frequency component of the luminance signal in the frequency division multiplexed signal is band-shared with a low frequency converted carrier chrominance signal. 5. The multiplexed information signal recording device according to claim 4, wherein the multiplexed information signal recording device is multiplexed.