Method and apparatus for volume control of a BTSC multi-channel

Details Method and apparatus for volume control of a BTSC multi-channel Method and apparatus for volume control of a BTSC multi-channel

1985-04-08

1987-03-31

Ng, Jin F.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358198, 381 2, 381104, H04N 704

Patent

active

046547070

ABSTRACT:
A volume control circuit for a BTSC multi-channel signal includes a trap for the SAP frequency components, a pair of delay lines and a combiner circuit forming a transversal equalizer for shaping a frequency response characteristic that attenuates stereo L+R low frequency components more than L-R mid-frequency components, a pilot frequency trap and a resistance controlled inverting amplifier, all for producing a variable frequency response in a first path. A fixed frequency response, complementary to that at minimum attenuation in the first path, is provided in a second path, the outputs of the two paths being combined to produce an overall frequency response that is variable from unity across the frequency band to a response corresponding to that in the second path. The pilot and SAP frequency components are never attenuated and the L+R frequency components are attenuated at a greater rate than the L-R frequency components to approximate the effects of the dbx expansion of the L-R frequency components in the following stereo or multichannel television receiver.

REFERENCES:
patent: 4389536 (1983-06-01), Schickedanz
patent: 4399329 (1983-08-01), Wharton
patent: 4461021 (1984-07-01), Schwarz et al.
patent: 4512031 (1985-04-01), Van Gils
patent: 4571622 (1986-02-01), Davidon et al.
"TV Multichannel Sound--The BTSC System", by Eilers, 2/1985, IEEE Trans. on Consumer Electronics, vol. CE-31, No. 1.

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