Television – Format – Including additional information
Patent
1992-12-31
1995-06-20
Groody, James J.
Television
Format
Including additional information
348482, H04N 704, H04N 7083, H04N 7084
Patent
active
054264669
ABSTRACT:
A method for inserting an audio signal (132) into a composite video signal (10) having a front porch (24), a back porch (26 or 32), a horizontal sync pulse (20) with a leading edge (22), and a luminance portion (16) to provide an audio-on-video signal (222), includes removing one or more video parts (180, 200) at least partially from the luminance portion (16), sampling one or more audio parts (182, 202), biasing a zero magnitude (238) of the audio parts (182, 202) to the midpoint (240) of the maximum luminance magnitude (242), and placing the sampled parts (182, 202) at least partially within the luminance portion (16) of the composite video signal (10) to form the audio-on-video signal (222). The method for inserting also includes inserting audio parts (212) into blanking parts (206) that follow leading and trailing equalizing pulses (46, 56); and the method for inserting further includes inserting audio parts ( 214) into blanking portions (60) of test signals (58) that follow the trailing equalizing pulses (56). A method for separating an audio signal (132) from the audio-on-video signal (222) includes sampling an audio plus magnitude (230) of the audio parts (182 and/or 202) at least partially within the luminance portion (16), subtracting a bias magnitude (234) to provide an audio sample magnitude (280 or 288), holding the audio ample magnitude (280 or 288), replacing the held audio sample magnitude (20 or 288) with a successive audio sample magnitude (280 or 288) to provide a stepped audio output (320), low pass filtering (310) to smooth the stepped audio output (320) and to prevent Nyquist problems, and high pass filtering (310) to prevent noise when an audio sample magnitude (318) is held during a vertical sync pulse (48).
REFERENCES:
patent: 2266194 (1941-12-01), Guanella
patent: 3423520 (1969-01-01), Kelly
patent: 3446914 (1969-05-01), Hodge
patent: 3857998 (1974-12-01), Justice et al.
patent: 3902007 (1975-08-01), Justice
patent: 4156253 (1979-05-01), Steudel
patent: 4191969 (1980-03-01), Briand et al.
patent: 4233627 (1980-11-01), Sugihara
patent: 4253115 (1981-02-01), Kergosien et al.
patent: 4318125 (1982-03-01), Shutterly
patent: 4333108 (1982-06-01), Quan et al.
patent: 4361852 (1982-11-01), Katzfey
patent: 4442461 (1984-04-01), Shirai et al.
patent: 4745476 (1988-05-01), Hirashima
patent: 4983967 (1991-01-01), McKenzie
Bocox Ronald R.
Lautzenhiser Lloyd L.
Emhiser Research Limited
Groody James J.
Lee Michael H.
Miller Wendell E.
LandOfFree
Composite video signal with audio does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Composite video signal with audio, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Composite video signal with audio will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1847574