Low-noise television system

摘要

A low-noise televison system having means for suppressing increased noise without reduction of improved picture quality. In the television broadcast transmitter, a television video signal is separated into luminance and chrominance signals and the luminance signal is further separated into high and low frequency components. The high frequency component is pre-emphasized in a specific emphasis characteristic relating to the amplitude of the low frequency component and the pre-emphasized high frequency component is then combined with the low frequency component and further matrixed with the chrominance signal to recover the video signal to be transmitted. In the television receiver, the received video signal is separated into luminance and chrominance signals and the luminance signal is further separated into high and low frequency components in similar fashion to the transmitter. The high frequency component is de-emphasized in a characteristic opposite of emphasis characteristic of the transmitter in accordance with the amplitude of the low frequency component and the de-emphasized high frequency component is then combined with the low frequency component and further matrixed with the chrominance signal to recover the video signal to be displayed.