Television signal recording and reproducing system

• US 3,975,764 A
• Filed: 10/07/1974
• Issued: 08/17/1976
• Est. Priority Date: 10/12/1973
• Status: Expired due to Term

• Current Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Original Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Inventors: Kanai, Kenji, Taniguchi, Hiroshi, Kobayashi, Fukashi
• Primary Examiner(s): Britton, Howard W.
• Application Number:
  US05/512,953
• Time in Patent Office: 680 Days
• Field of Search: 360/23, 360/33, 360/37, 358/4, 358/8
• US Class Current: 360/23
• CPC Class Codes: H04N 5/919 by dividing samples or signal segments, e.g. television lines, among a plurality of recording channels
• CPC Class Codes: H04N 9/7973 by dividing the luminance or colour component signal samples or frequency bands among a plurality of recording channels H04N9/804, H04N9/825 take precedence

Abstract

A television signal recording and reproducing system wherein a television signal to be recorded is sequentially sampled at a predetermined number of points during each horizontal scanning period thereby to convert the television signal occupying a wide band into substantially vertically scanned signals. The converted signals, which have also been divided into multichannel signals, are recorded on a recording medium with a multichannel magnetic head. Reproduced signals from the multichannel head are sampled and added to produce the original television signals in a similar but reverse operation to the recording operation.

Claims

1. A television signal recording and reproducing system comprising:

means for generating a clock pulse having a frequency which is an n ×

m multiple of a horizontal scanning frequency and is phase-locked to the horizontal scanning frequency;

sampling means for sequentially sampling a television signal to be recorded at n ×

m points during each horizontal scanning period thereof in response to the clock pulse and for converting said sampled signals into parallel signals;

means for holding said sampled signals for a period of time approximately corresponding to 1/n of said horizontal scanning period;

means for recording said held signals on a recording medium on m channels of recording tracks and for reproducing said recorded signals;

means for writing said reproduced signals on an m-channel memory circuit at the same time at the interval of 1/n of the horizontal scanning period;

means for reading out said written signals one by one at the interval of 1/m×

n of the horizontal scanning period; and

means for synthesizing a continuous television signal from the read out signals.

2. A television signal recording and reproducing system according to claim 1, wherein said sampling means comprises:

an m-bit ring counter driven by said clock pulse;

means for sampling the input television signal in response to each of m-bit output pulses from said ring counter;

m-channel memory elements for storing sampled signals; and

means for simultaneously gating said stored signals in said m-channel memory elements to apply the gated signals to said holding means.

3. A television signal recording and reproducing system according to claim 1, wherein n = 1.

4. A television signal recording and reproducing system according to claim 1, wherein said means for writing said reproduced signals on said m-channel memory circuit includes a first clock signal in synchronism with a reproduced control signal, and said means for reading out said written signals includes a second clock signal generated in a reference signal oscillator.

5. A television signal recording and reproducing system comprising:

means for sequentially sampling a television signal to be recorded at n ×

m points during each horizontal scanning period thereof;

means for shifting said n ×

m sampling points in the adjacent fields of said television signal from each other by the distance corresponding to 1/2 of one sampling period;

m groups of holding means for holding said sampled signals for the duration of a time aproximately corresponding to 1/n of the horizontal scanning period;

means for causing said m groups of holding means to sequentially hold said sampled signals;

means for recording on a magnetic medium in a form of m rows of recorded patterns said sampled signals held by said m groups of holding means and for reproducing said recorded signals; and

means for synthesizing a continuous television signal from said reproduced m channel signals.

6. A television signal recording and reproducing system according to claim 5, wherein n = 1.