H - Electricity
04
N
350/94
H04N 5/60 (2006.01) H04N 5/44 (2006.01)
Patent
CA 1214544
ABSTRACT "TV-IF circuit". TV-IF circuit comprising a balanced video signal path (A5, M, A6, VM) arranged between an IF-input (1, 1') and a video signal output (2, 2') and a balanced sound sig- nal path (A1, A2, A7, SM) arranged between the IF-input (1, 1') and a sound signal output (3, 3'), these two paths comprising a video mixing stage (VM) and a sound mixing stage (SM), respectively for a quasi-parallel sound signal processing or an intercarrier sound signal processing. The compatability between these two modes of sound signal pro- cessing increases the range of applications compared with prior art TV-IF circuits and this is accomplished by a ma- trix circuit (M) comprising a balanced, non-inverting (5,5') and a balanced, inverting (4, 4' ) input, as well as a ba- lanced output (6, 6'), the matrix circuit (M) being included via the non-inverting input (5, 5') and the output (6, 6') in one (A5, M, A6, VM) of said two signal paths (A5, M, A6, VM or A1, A2, A7, SM) between the IF-input (1, 1') and a signal input (7, 7') of the mixing stage (VM) in this sig- nal path (A5, M, A6, VM), the other signal path (A1, A2, A7 SM) between the IF-input (1, 1') and a signal input (10, 10') of the mixing stage (SM) in the last-mentioned signal path A1, A2, A7, SM) being connected to the balanced, inverting input (4, 4') of the matrix circuit (M) and comprising be- tween the IF-input (1, 1') and the matrix circuit (M) a balanced first pair of terminals (9, 9') which may optional- ly be shortcircuited, remain open-circuited of for connect- ing therebetween a resonant circuit (FSC) having a resonant frequency which corresponds to a sound carrier frequency of the TV-IF signal applied to the IF-input.
420369
N.v.philips'gloeilampenfabrieken
Van Steinburg C.e.
LandOfFree
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