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Video signal recording and/or reproducing apparatus
| Details |
Inventors: Matsuo, Yasutoshi;
Assignee: Victor Company of Japan, Ltd. (Yokohama, JP)
Primary Examiner: Faber; Alan
Assistant Examiner:
Attorney, Agent or Firm: Meller; Michael N.
A video signal recording apparatus comprises a sampling circuit for sampling an input video signal by a signal having a predetermined frequency f.sub.s, a circuit for obtaining a multiplexed signal by multiplexing a reference burst signal to the output sampled signal of the sampling circuit, and a circuit for recording the multiplexed signal on a recording medium. A video signal recording and reproducing apparatus comprises in addition to the constituting elements of the recording apparatus, a circuit for reproducing the recorded multiplexed signal from the recording medium, a circuit for obtaining from the reproduced multiplexed signal first and second reproduced sampled signals having a relative time difference of one horizontal scanning period, a circuit for generating first and second sampling pulses having the same frequency f.sub.s and having phases which mutually differ by 180.degree., a circuit for re-sampling the first and second reproduced sampled signals by the respective first and second sampling pulses so as to obtain first and second re-sampled signals, and a circuit for at least adding the first and second re-sampled signals so as to obtain a reproduced video signal. |
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DETAILED DESCRIPTION Accordingly, it is a generally object of the present invention to provide a novel and useful video signal recording and/or reproducing apparatus in which the problems described heretofore are eliminated.
Another and more specific object of the present invention is to provide a video signal recording and reproducing apparatus which obtains at the time of a recording a sampled signal by sampling an input video signal such as a luminance signal by a sampling pulse having a sampling frequency which is higher than an upper limit frequency of a frequency band required by the input video signal and records a multiplexed signal in which the sample signal and a reference burst signal are multiplexed, which sampling frequency is less than twice the upper limit frequency and is an odd number multiple of 1/2 the horizontal scanning frequency.
At the time of a reproduction, the sampled signal is reproduced and two kinds of reproduced sampled signals having a mutual time difference of one horizontal scanning periods are obtained from the reproduced sampled signal.
The two kinds of reproduced sampled signals are independently re-sampled by two kinds of re-sampling pulses which are obtained from a reproduced reference burst signal, which two kinds of re-sampling pulses have phases which mutually differ by 180.
degree.
and have the same frequency as the sampling frequency at the time of the recording, so as to obtain two kinds of re-sampled signals.
A reproduced video signal is obtained by adding the two kinds of re-sampled signals.
According to the apparatus of the present invention, it is possible to obtain at the time of the reproduction the re-sampling pulses which are in phase synchronism with the sampling pulse at the time of the recording, compared to a case where a pulse obtained from a phase locked loop (PLL) which is supplied with a horizontal synchronizing signal at the time of the reproduction is used as it is as the re-sampling pulse.
Hence, it is possible to display a reproduced picture having sampling points which are located at approximately the same positions as the sampling points at the time of the recording, and the video signal can be reproduced with a satisfactory reproducibility
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