NTSC color television system with improved chroma bandwidth and

Details NTSC color television system with improved chroma bandwidth and NTSC color television system with improved chroma bandwidth and

1990-04-13

1992-01-14

Shepperd, John W.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 12, 358 16, H04N 1118, H04N 1114, H04N 1100

Patent

active

050815210

ABSTRACT:
A chroma modulation method for extending the bandwidth of baseband plural chroma components of an NTSC format quadrature modulated chroma subcarrier color television signal, such as I and Q components, with reduced susceptibility to ringing and with compatibility with existing NTSC color television receivers comprises the steps of: separating the baseband I and Q components into narrow bandwidth segments and extended bandwidth portions not including the narrow bandwidth segments; q u a d r a t u r e modulating the narrow bandwidth segments into a narrow band double sideband quadrature modulation envelope about the subcarrier frequency; alternately selecting and putting out the extended bandwidth portions of the I and Q components on a basis related to a predetermined scanning period of the television signal, such as the field period; modulating the alternately selected extended bandwidth portions at the subcarrier frequency to produce a lower single sideband; and, combining in corrected time relationship the double sideband quadrature modulation envelope and the lower single sideband of the extended bandwidth portion modulation envelope to provide chroma modulation having an extended bandwidth. A compatible demodulation method is also described.

REFERENCES:
patent: 4641179 (1987-02-01), LoCrcpvo et al.

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