JPS59171011A - Recording and reproducing system - Google Patents

Abstract

PURPOSE:To execute audio reproducing of high quality by superposing and recording a signal converted to a pulse train by bringing an audio signal to prescribed digital modulation processing, to a frequency modulation processing signal of a video signal and an audio signal, and giving an interchangeability with an existing apparatus. CONSTITUTION:A video signal and an audio signal are inputted to a modulator 1 and 2, frequency-modulated, and superposed by an adder 3. Subsequently, they are supplied to an electrooptical modulator 5 through a limiter 4, and laser light from a laser light source 6 is modulated and becomes a recording signal to a video disk. also, an output of a digital encoder 7 is inputted to an adder 3, and the encoder 7 converts the audio signal to PCM and makes it a pulse train signal. Said recording signal is read by a pickup 8. A video output is obtained through a BPF10, an audio output is obtained through an LPF11 and a BPF14, and an audio output is obtained by an LPF12 and a decoder 16. In this way, an interchangeability with an existing apparatus is maintained, and audio reproducing of high quality is executed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a recording and reproducing system, and more particularly to a recording system and a reproducing power system in which audio information is multiplexed and recorded in addition to video information.

There is a so-called video disc system as a method for multiplexing and recording video information and audio information.
The figure shows an outline of the recording system. In the figure, a video signal and an audio signal are input to modulators 1 and 2, respectively, and frequency modulated (hereinafter referred to as FM modulation). Both modulation outputs are superimposed in an adder 3 and sent to a limiter 4.
The signal is then inputted manually and turned into a rectangular signal, which is then supplied to an audible (electrical/optical) modulator 5. A recording laser beam from a laser light source 6 is modulated by this 1VO modulator 5 and becomes a recording signal to a video disk (not shown).

FIG. 2 shows the frequency spectrum at the output section of the adder 3. The audio signal is converted into two channels, and the audio gears of 2.3 MIIZ and 2.3 MI - FM modulation is performed by a bow.Although only one audio modulation system is shown in the box 74 in Fig. 1 for simplicity, there are actually two systems.Video signal is frequency-converted such that the sink tip 0 is 7.61'Jfl(z, the pedestal level is 3, lMl, -1z, and the point peak is 9,3rv old Z).

In the conventional video disc recording system, the audio signal is directly modulated as analog No. 18 and converted to hU.
Because it is recorded twice, its dynamic lens is 60.
The value must be as small as ~65 d·B, and it is impossible to produce high-quality audio ion +3.

The present invention has been made in order to eliminate the drawbacks of the conventional method, and an object of the present invention is to provide a system that can obtain high-quality media signals with a wide dynamic range. .

In addition to video signals, audio signals, and 6 1"M modulated signals, the recording system according to the present invention converts open audio signals into digital signals using a predetermined digital modulation method and converts them into signal train signals to the FM. It is characterized in that it is superimposed on the modulated signal and recorded on the recording medium.

The reproducing method according to the present invention is capable of reproducing information from a recording medium recorded by the above recording method.
It is characterized in that the A6 component converted into a pulse train is extracted 17 from the read information from the A6 signal and demodulated into an audio signal.

In the following, the present invention will be explained with reference to the drawings.

FIG. 3 is a schematic diagram of the recording method of the present invention, and parts equivalent to those in FIG. 1 are designated by the same reference numerals. In the present invention, in addition to the conventional configuration shown in FIG. There is. That is, the audio signal is digitalized by the modulation method of PCM (Pulse Code Modulation) and transformed into a pulse train signal 7, and this is output from the I''M modulators 1 and 2. 5.The rest is the same as the conventional example shown in FIG.

In the dinotal encoder 7, the audio signal is converted into PCM and converted into a pulse train signal.
- Widely used fq-EFM (ei yht t.

forteCn, m, od, u#a, tion), but is not limited thereto. The frequency wave l·ram of this dinotarf A-manto becomes a frequency component of a pulse train having a width of 3'P to IIT. Here, T indicates the bi-nod period of l) CM signal, and the 3'F pulse is approximately 72
0kl(z.

The 4T pulse is approximately 54.0A:■■z, and the maximum width l
l'r)" is about 200 A: I-b. In this way, the nanocycle train (P) is superimposed on the video main carrier at a level of about 1/10 or less, and the limiter 4 The signal is slice-amplified to produce a pulse-width modulated signal.

FIG. 4 shows the frequency stream at the output of the adder 3, and the component indicated by 8 is the spectrum of the digital audio signal.

Figure 5 is an example of signal waveforms for each part of the block in Figure 3. (G) to σ are video FM modulation output, Audio 1st modulation output, Di Sotal audio modulation output, and addition, respectively. Output and limiter output are shown.

The diisotal audio modulation output θ shown in FIG. 0 is theoretically a rectangular wave indicated by a dotted line, but in reality it is indicated by a solid line due to the limitations of the frequency characteristics of the circuit. Figure ■〕
) is a waveform obtained by slice-amplifying the waveform near the zero crossing of the 0 waveform or a waveform generated by a zero-level comparator, and is Noculus width modulated.

The dynamic rent of this desotalized audio information can be about 90 di3 or more, and the sound quality can be improved more easily than when recording audio information using the FM modulation method.

1. Since J"M modulated audio information is also multiplexed and recorded at the same time, compatibility with conventional video disk systems is maintained. Furthermore, the digital modulation method has been changed to the same standard as the existing Dinotal audio system. By multiplexing using this method, it is possible to maintain compatibility with existing Dinotal Audio Delayers.

FIG. 6 is a block diagram of the reproduction method of the present invention, which is used to reproduce a recording medium recorded by the recording method of FIG. 3. After being amplified by the pick-up 8 or the radio read i(F (high frequency) signal, it is manually transferred to the filters 10 to 12 that separate different types of information from each other.・BPF (band filter) for extracting video information The extracted power (A) by 10 is supplied to a video detector 13 and demodulated into a video A signal. Oteiogi Vrihachi'
The output (I3) of I, PF 11, which passes frequencies below (2,81'V11-(z), is 2.3 MI (Z
and 2.8■Iz are supplied to BPF14 which passes only the audio gear rear components. This BPF output 0-
The signal is FM-detected by the wave detector 15 and becomes a two-channel audio signal.

Also, L allows only dinotal audio information to pass through.
The output 0 of the PiF 12 is supplied to the decoder 16 and decoded and reproduced to the Audichi 8 bow.

Figure 7 (A) ~ σ)) shows the various parts of Figure 6 (A) ~ 0
)) is a diagram showing the frequency stream tram of BPFL,
1 to the output of 0, (7.6 to 9.3 Ml- as shown in ~
1z e ffr FM modulated wave. 1) P
The output of Fll is σ3) as < 2, 8M [-Iz less than 1
・Audio at all levels] Contains information components and is a YnoPF
The output of No. 12 is a component of 0 < 720 kHz or higher. The output of BPF 1 and 4 is only 2 channels of audio and 4FM modulated waves.

FIG. 8 shows another example of the reproducing device according to the present invention.
Parts equivalent to those in the figures are indicated by the same reference numerals.

In this example, the audio Af broadcast recorded during implementation using FM modulation processing has 2 channels, and the audio information time-divisionally recorded using Vinotal processing also has 2 channels. It is.

Audio I, I) Output via Fll is BPFi, 11
．． and passing through 1411°”:su, 2, 3fVI
117 audio carrier components to I(z and 2.8), which are separated and extracted, respectively, to detectors 15I-J and 15
1 (detected at !1), the left and right channels are detected. The time-divisionally processed 2-channel dinotal A-dio information is demodulated and separated into right channel signals by the decoder 16, and then sent to the signal selection switch +7. , ], 8
Each of them will be powered by one person. The respective outputs of the detectors], 5I7, 15i(,
-1), and by interlocking control of both switches 17 and 18, it is possible to freely select either the reproduced output by I'M modulation or the internal output by digital modulation.

Fig. 6) is a block diagram of another example of the present invention;
Parts equivalent to those in Figure 8 are designated by the same number 91. In this example, we will use the existing VDI'
In addition, this example is for the case where a differential audio playback adapter 30 is used. At Azone 0:30, LP1
1" 12 and a decoder 16, the two-channel output of the decoder 16 is connected to one switch 17 and one switch 18 each,
Also, switch the 2-channel audio output from ~1DP2Q to 1. ．． 7, 1.8 I try to rely on each other's help. Also, the two-channel audio output from VI) P2O is directly derived via this adapter 30 (indicated by L, , R,).

Through the interlocking control of these switches 1.7, ], and 8.

(2) The selection of whether the FM processing playback output to the 72nd part is the power of the Dinotal processing playback output can be made to the existing Vl) P\0] path addition (~).

As described above, according to the present invention, high-quality audio information with a wide range of sound is multiplexed and recorded with audio information while maintaining compatibility with existing systems. This makes it possible to reproduce high quality audio signals without the need for modifying a video disc player or an audio player, resulting in an extremely useful recording and reproducing system.

However, this is not enough to record information on existing video disc players.

Note that 2-channel multiplexing of 1'M modulated audio broadcasts is performed in 1. Although it is considered to be a real-time multiplexing method using ``6i'' U number division, 2-channel multiplexing of digitally modulated audio information is similar to the time division multiplexing method.

[Brief explanation of drawings]

Fig. 1 is a book diagram of an example of the conventional recording method, Fig. 2 is a diagram showing the frequency spectrum of recorded information obtained by the recording method of No. 11, and Fig. 3 is a diagram of the recording method of the present invention. A block diagram of the embodiment; FIG. 4 is a diagram showing the frequency stream of recorded information obtained by the recording method shown in FIG. 3; FIG. Fig. 6 is a block diagram of an embodiment of the conventional power type of the present invention, Fig. 7 is a diagram showing the frequency wave tram of each part signal of 7'' + + - 1 in Fig. 6, Figs. 8 and 9. 1 is a block diagram of another example of the reproduction method of the present invention. ↑Explanation of codes of two important parts
...Limiter 7. Ino Taruncota 8..Pickup 12
...i,, 1) F2O...T Korg Applicant Pioneer Co., Ltd. Representative Patent Attorney Motohiko Izumi Fujimura / Figure 2 and Figure 1 Figure 5 (8) (Q) ”--- J-

Claims (2)

[Claims] (1) A recording method in which a video signal and an audio signal are subjected to extensive frequency modulation processing and recorded on a predetermined recording medium, and the audio signal is further subjected to predetermined digital modulation processing and converted into a pulse string. A recording method characterized in that the above-mentioned video signal and audio signal are superimposed and recorded on each frequency modulation processed signal. (2) Information is obtained from a recording medium recorded by superimposing a signal obtained by frequency modulation processing of a video signal and an audio signal, respectively, and a signal obtained by further performing predetermined digital modulation processing of an audio signal and forming a signal sequence. What is claimed is: 1. A reproduction method for reproducing information, the reproduction method being characterized in that the above-mentioned signal component converted into a pulse string is extracted from the information read from the pickup and demodulated into an audio signal.