SU653767A1 - Television signal recording-reproducing method - Google Patents

Description

The invention relates to an image transmission technique and can be used for recording and reproducing television signals.

A known method of recording and reproducing a television signal on a rotating disc is based on recording one frame from a frame sequence while simultaneously recording the sound signal of the entire frame sequence and then playing the recorded frame n the number of times where n is the number of frames in the sequence with corresponding playback of audio signals one.

However, such a method of recording and reproducing a television signal with an increase in recording density does not provide a high quality fast image transmission.

The purpose of the invention is to increase the recording density and improve the quality of the reproduced television signal.

For this, in the method of recording and reproducing a television signal on a rotating disc, based on the recording of one

frames from a sequence of frames while simultaneously recording the sound signal of the entire sequence of frames with subsequent reproduction of the recorded frame l number of times, where n is the number of frames in the sequence with corresponding reproduction of sound signals, before recording on a rotating disc, the full television signal is recorded on an intermediate storage medium from which two adjacent frames are read in phase and elementwise, form a difference signal from them, which they integrate and compare ivayut during frame pulse with a reference signal, which is produced when prevyschenii m disk writing video frame signal, which is recorded together with the information on the number of frames in the frame sequence.

The drawing shows a structural electrical circuit of a device implementing the proposed method.

It contains an intermediate carrier 1 of information, reading blocks 2, 3, block 4 differences, integrator 5, comparator

6, a recording unit 7, a disk 8, a sound storage device 9, a counter 10, a sync selector 11.

The device works as follows.

A full television signal, pre-recorded on intermediate information carrier 1, is read from two adjacent turns to two readings by blocks 2 and 3. When reading from the preliminary media, two turns on which identical frames are recorded, transmitting the unchanged image, reading blocks 2 and 3 produce the same video signal and the output signal of the block 4 of the difference is zero. Comparator 6 does not signal the write block 7 and does not write to disc 8. When advancing the read head, for example from the center to the periphery, the two readable adjacent frames become different. The integrator 5 accumulates the s-signal and when the next HR sync pulse selected by the sync selector 11 arrives, the comparator 6 compares the signal from the output of the integrator 5 with the reference signal. Thus, the number of frames in a sequence is determined by the number of sync pulses elapsed during the time until the integrated signal exceeds the reference signal. If the compared signal exceeds the reference, then comparator 6 opens recording unit 7 and writes to disk 8. At the same time, comparator 6 issues a command to read blocks 2 and 3 to re-read the same turns from intermediate media 1. The recording unit 7 receives the audio information of the latter for a given frame sequence from the reading unit 2, as well as the soundtrack of all the missing frames of the given sequence from the accumulator 9 of sound and information. . about the number of frames in this sequence from counter 10. Counter 10 counts personnel sync pulses from sync selector II until it receives a signal from comparator 6. After that, counter 10 feeds information about the number of counted sync pulses to block 7, as well as includes the corresponding number of sound channels that transmit sound from the sound storage device 9 to the recording unit 7. Each channel is connected to its drive read head 9

sound, therefore. ,, sound for several channels simultaneously the soundtrack of all the missing frames of this sequence. As a result of such recording, on each turn of the disk 8, video information of one frame from the sequence of frames, sound accompaniment of the entire sequence and information on the number of frames in the sequence are recorded. After recording each turn, a command is given to record the next one, etc. When a television signal is being reproduced, the reading head reads information about how many frames this revolution has and reproduces it an appropriate number of times, alternately switching the sounds. After reading this coil as many times as necessary, a command is sent to transfer the read head to the next BITOT, etc.

Claims (1)

1. US Patent No. 3908080, cl. 178-6.8, 1975.