TV-IF Circuit

Details TV-IF Circuit TV-IF Circuit

1983-01-24

1985-07-09

Masinick, Michael A.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358197, H04N 560, H04N 562

Patent

active

045285926

ABSTRACT:
TV-IF circuit comprising a balanced video signal path (A.sub.5, M, A.sub.6, VM) arranged between an IF-input (1, 1') and a video signal output (2, 2') and a balanced sound signal path (A.sub.1, A.sub.2, A.sub.7, 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 processing increases the range of applications compared with prior art TV-IF circuits and this is accomplished by a matrix circuit (M) comprising a balanced, non-inverting (5, 5') and a balanced, inverting (4, 4') input, as well as a balanced output (6, 6'), the matrix circuit (M) being included via the non-inverting input (5, 5') and the output (6, 6') in one (A.sub.5, M, A.sub.6, VM) of said two signal paths (A.sub.5, M, A.sub.6, VM or A.sub.1, A.sub.2, A.sub.7, SM) between the IF-input (1, 1') and a signal input (7, 7') of the mixing stage (VM) in this signal path (A.sub.5, M, A.sub.6, VM), the other signal path (A.sub.1, A.sub.2, A.sub.7 SM) between the IF-input (1, 1') and a signal input (10, 10') of the mixing stage (SM) in the last-mentioned signal path (A.sub.1, A.sub.2, A.sub.7, SM) being connected to the balanced, inverting input (4, 4') of the matrix circuit (M) and comprising between the IF-input (1, 1') and the matrix circuit (M) a balanced first pair of terminals (9, 9') which may optionally be shortcircuited, remain open-circuited or for connecting 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.

REFERENCES:
patent: 4349842 (1982-09-01), Apeldoorn
patent: 4395735 (1983-07-01), Holmes
patent: 4419695 (1983-12-01), Yamamoto
patent: 4470071 (1984-09-01), Rindal
"Bipolar ICs for Video Equipment" Philips Data Handbook-Integrated Circuits, Part 2, Jan. 1983.
Aufbereitung des Fernsehtonsignals mit den Integrierten Schaltungen TDA 2545 und TDA 2546 nach dem Quasi-Paralleltonverfahren, Valvo Entwicklungsmitteilungen, Achterberg et al., pp. 1-37, Nov. 1980.

Affiliated with

Also associated with

Rating

TV-IF Circuit does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with TV-IF Circuit, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and TV-IF Circuit will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-912401