Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1981-11-25
1983-08-16
Hickey, R. J.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
179 1GM, 358144, 358341, H04N 560, H04H 500
Patent
active
043993290
ABSTRACT:
The format of two audio input signals, which may be of either matrixed form wherein each signal comprises two common components or of unmatrixed form wherein each signal comprises a respective independent component, is determined by applying the signals to a first network circuit which linearly combines the signals to produce a resultant audio output signal exhibiting a null condition when the input signals are of matrixed form and a non-null condition when the input signals are of unmatrixed form. A null detector responsive to the resultant signal supplies a control signal to a second decoder matrix which decodes the matrixed signals to independent form and couples the decoded signals to respective first and second output terminals when the null condition is detected and which couples the unmatrixed input signals to respective ones of the first and second output terminals when the non-null condition is detected.
REFERENCES:
patent: 3795764 (1974-03-01), Altmann
patent: 3969756 (1976-07-01), Palmer et al.
patent: 4016366 (1977-04-01), Kurata
patent: 4236041 (1980-11-01), Thomas
patent: 4272788 (1981-06-01), Ogita
patent: 4302837 (1981-11-01), Tanaka et al.
"Multichannel Sound System for TV Broad Casting", Numaguchi et al., IEEE Consumer Electronics, 8/1981, pp. 366-370.
Data Sheet Type TA 7633p Integrated Circuit.
Coalter R. G.
Hickey R. J.
RCA Corporation
Tripoli J. S.
Whitacre E. M.
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