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Abstract

Transmitting and receiving apparatus, for transmitting an input video signal having 525 lines/field progressive scanning by converting the input video signal into a signal compatible with the NTSC system, and for reproducing from that NTSC-compatible signal a video signal having 525 lines/field progressive scanning. The transmitting apparatus has a first separating system for separating vertical high frequency components in a three-dimensional horizontal-vertical-temporal domain from the input video signal; a modulating system for modulating the separated components from the first separating system by .mu.-modulation; a system for filtering a modulation output from the modulating system to remove a lower sideband component from the modulation output, the filtering system having a Nyquist characteristic; and a system for multiplexing a filtered output from the filtering system to form the NTSC-compatible signal. The receiving apparatus has a second separating system for separating the multiplexed filtered output from the NTSC-compatible signal; and a system for reproducing a video signal having 525 lines/field progressive scanning in response to the filtered output from the second separating system. More particularly, the vertical high-frequency components have a vertical spatial frequency of 515/4 cph, and the filtered output from the filtering system has a frequency band of 2.2 MHz to 4.2 MHz.

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First Claim