JPS59148102A - Recording and reproducing device of video and sound information - Google Patents

Abstract

PURPOSE:To neglect the effect of an address signal to a sound signal by setting the relation between the minimum inverse interval of the address signal and the carrier wave of the sound signal so that the sound signal is recorded in a spectrum region of the address signal. CONSTITUTION:The address signal is previously recorded to a track on a recording medium and at a position within a vertical blanking time of a video signal to be recorded. The address signal underwent a phase encode (PE) modulation has a region having a small spectrum component between 3/2T and 5/2T of frequency (T: bit period). The signals within said frequency region receive no effect of the address signal. The address signals existing between 3t/4 and 5t/4 in terms of the minimum inverse period Tmin of a cycle (t) of a sound carrier wave to be recorded have reduced effects to the sound signal. This effect is minimum with the maximum inverse period Tmin = t. As a result, an optical position can be freely retrieved and the recording is possible at an optional position.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention records all video signals and audio signals on a track 21-track in which an address signal indicating a position on a recording medium is recorded in advance on a part of the track. The present invention relates to a recording/playback device for playback.

Conventional configurations and their problems Currently, a system is being considered that facilitates searching by sequentially traversing all addresses for each field or frame of a video signal in a video disk or the like. As shown in FIG. 1, a code signal 2 indicating position information is inserted into a part of the vertical blanking period Tv of the video signal 1. This method allows addresses to be assigned to the recording tracks on which information is recorded, without any loss of video or audio information, and, like a video disc,
This method is very suitable for reproducing signals from a recording medium on which pre-edited signals have been continuously recorded.

However, with this method, it is not possible to obtain position information on the recording medium without recording the video signal, so it is not possible to search for an arbitrary position prior to the start of recording, and when recording intermittently, addresses are discontinuous. It has the disadvantage of being extremely difficult to operate as a recording device.

Therefore, in such a recording device, the power of recording an address indicating position information in advance on a track provided in advance on a recording medium is controlled by the operation (Is /j- better? 16, like the method of inserting into the video signal mentioned above, the UB damage to the video signal and the audio signal cannot be ignored, and 4!1', like the vertical retrace period of the video signal y3,
Effect 4: Interference with audio signals that do not have a special period, which can be ignored in practice, can cause a significant deterioration of the quality of the sound that is heard.

[1] Purpose of the invention IIT, recording video information and audio information
T3′ and 2 also hardly degraded the quality of audio information (
j': By forming an address signal in advance on a part of the track on the recording medium, it is possible to record video and audio information with good operability.

Structure of the Invention The address signal pre-formed on a part of the track of the recording medium in the present invention is a signal recorded by modulating the address signal. , the spectrum t, when viewed as a whole, has peaks and notches based on the minimum reversal interval of its beliefs.

The larger the spectral component of this recorded address signal, the more
Since the audio signal recorded in a superimposed manner is greatly affected, in the present invention, C1, the audio signal is not affected by the address signal J: uni, in the above-mentioned address signal spectrum "valley" region, The relationship between the minimum inversion interval of the address signal and the audio signal carrier wave is set so that the audio signal is recorded, and the influence of the address signal on the audio signal is actually negligible.

DESCRIPTION OF THE EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. Second
The figure shows an example of a signal spectrum recorded on a recording medium by multiplexing a video signal and an audio signal.The color signal 3 is converted to a low band and consists of a color carrier wave.For example, its subcarrier frequency is 630KHz. +5 around that
00 KHz I/C has widening sideband waves. The audio signal 4 is a frequency modulated 2 channel A channel signal, for example, its 5I, center frequencies are 1.3 MHz and 1.5 MHz,
The frequency shifts upward by 60 KHz around it. Also,
The luminance signal 5 is a frequency modulated signal, for example, its modulation frequency range is from 5.2 MHz to 6.7 MHz.
), and has a sideband that spreads to +3.2MHz around that point.

The address signal is recorded in advance on a track on the recording medium so as to be located within the vertical retrace period of the video signal to be recorded. For example, as shown in FIG. Bf, Pino F 11111 v, corresponds to reversal in one direction, bit "o"' corresponds to reversal in all opposite directions, so that it can also be reversed at the boundary between bits if necessary, so-called, P
E (Phase Encoding) modulation is performed to create an address signal.

In PE modulation, as shown in Fig. 3, for the reciprocal T of the data bit transfer rate (hereinafter referred to as F1 bit period), the minimum inversion interval TJlin = T/2, and the maximum inversion interval Tmax = T As shown in Fig. 4,
The signal spectrum 61-28 having the minimum reversal interval T is rich with peaks and notches as shown by solid lines, and the signal spectrum 9 having the maximum reversal interval Tmax' has peaks and valleys as shown by broken lines. There are other transient intermediate states, but their spectral components are small when viewed as a whole and can be ignored on the solid line, so the PE-modulated address signal has a frequency between 3/2T and 6/2T. There is a region with few spectral components, and signals in this frequency region are least affected by the address signal.

The bit period T of the address signal is, for example, 1.43 μB.
, this address signal has a frequency of 1.1.05MHz to 1.
There is a valley of spectral components between 75 MHz, and the address signal component in that frequency range is small, so the aforementioned voice signals with center frequencies of 1.3 MHz and 1.5 MHz are completely affected by this effect, and in practice it is You can make sure there are no problems.

In this way, for the period t of the audio carrier wave to be recorded,
An address signal whose minimum inversion period Trmn is between 3t/4 and 5t/4 has little influence on the audio signal, and when the minimum inversion period T==t, the influence 71, · becomes minimum. In addition, if the audio information is stereo or bilingual and there are multiple audio carrier waves, when the average of their periods is equal to the minimum inversion period Tam of the address signal,
Overall, the influence of address signals on voice information is minimized.

Effects of the Invention According to the present invention, even if an address signal is recorded in advance on a track on a recording medium, it is possible to prevent C2 from affecting the video signal or audio signal to be recorded. An address signal can be recorded in advance on a part of the upper track, so even if no video signal is recorded, you can freely search for any position on the recording medium. It is possible to obtain an extremely easy-to-operate video/audio information recording and reproducing device that can freely record data.

[Brief explanation of drawings]

Figure 1 is a waveform diagram showing a conventional example in which address information is inserted into a part of the entire video signal, Figure 2 is a spectrum diagram of each signal recorded on a recording medium in an embodiment of the present invention, and Figure 3 is a waveform diagram of this example. FIG. 4 is a diagram showing an embodiment of the address signal in the invention, and FIG. 4 is a diagram showing the spectrum of the address signal in FIG. 3. 1...Video signal, 3...Color signal, 4...
...Audio signal, 6...Brightness signal, 7...
...Address signal. Name of agent: Patent attorney Toshio Nakao and 1 other person
1 Figure 3 Figure 4

Claims (2)

[Claims] (1) An address signal having a minimum inversion interval longer than 3/4 times the period of the audio signal carrier wave to be recorded and shorter than 5/4 times the period of the audio signal carrier wave to be recorded is placed in the vertical blanking period of the video signal recorded on a part of the above track. 1. A video/audio information recording and reproducing apparatus characterized in that the address signal is recorded in advance so that the address signal is recorded, and the video signal and audio signal are fully multiplexed and recorded and reproduced on the track where the address signal is recorded. (2) The video according to claim 1, wherein the period of the audio signal carrier wave is a groove, and when there are multiple carrier waves, the average of the periods is equal to the minimum inversion interval of the address signal. -Audio information recording and playback device.