Television – Image signal processing circuitry specific to television – Color television signal processing
Patent
1995-01-31
1995-12-05
Groody, James J.
Television
Image signal processing circuitry specific to television
Color television signal processing
348707, 348692, 348728, H04N 964
Patent
active
054733901
ABSTRACT:
A bias source (R7,R8,C24) connected to a summing amplifier (Q1) produces a first DC bias at the amplifier input (emitter) and a second DC bias at the amplifier output (collector). A first circuit node (B) is AC coupled (22) to a luminance signal source (Y1, 18), DC coupled via a first resistor (R4) to the input of the summing amplifier and DC coupled via a first amplifier (28) to a luminance load (Y3,30). A second circuit node (A) is AC coupled (20) to a chrominance signal source (C1,18), DC coupled via a second resistor (R3) to the input (emitter, Q1) of the summing amplifier and DC coupled via a second amplifier (26) to a chrominance signal load (C3,30). A third amplifier (Q2) provides DC coupling of the output of the summing amplifier (Q1) to a composite video signal load (E,40). Advantageously, the circuit provides component to composite conversion with plural buffered outputs which may exhibit different power gains, which are stable notwithstanding load impedance variations and which are DC biased by bias produced at the summing amplifier input as well as its output thereby simplifying the conversion and buffering.
REFERENCES:
patent: 4167021 (1979-09-01), Holmes
patent: 5032900 (1991-07-01), Sendelweck
patent: 5107341 (1992-04-01), Sendelweck et al.
patent: 5202765 (1993-04-01), Lineberry
patent: 5296921 (1994-03-01), Klink
Gurley Thomas D.
Sendelweck Gene K.
Yost Thomas D.
Coalter Richard G.
Emanuel Peter M.
Groody James J.
Hsia Sherrie
Thomson Consumer Electronics Inc.
LandOfFree
Component to composite video signal converter 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 Component to composite video signal converter circuit, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Component to composite video signal converter circuit will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1377305