H - Electricity – 04 – N
Patent
H - Electricity
04
N
350/3, 350/97
H04N 5/40 (2006.01) H04N 5/60 (2006.01) H04N 7/06 (2006.01)
Patent
CA 1182204
A B S T R A C T A television signal audio transmission system comprises transmission means for developing first and second stereophonic- ally related audio signals and means for developing a third audio signal. The transmission means further includes circuitry for developing a composite baseband signal having a first component comprising the sum of the first and second audio signals, a second component comprising a double sideband suppressed carrier signal formed by amplitude modulating a 2fH subcarrier with the difference between the first and second audio signals, a third component comprising a pilot signal having a frequency fH and a fourth component comprising a 4fH subcarrier signal frequency modulated according to the third audio signal, where fH represents the horizontal scanning line frequency. The composite baseband signal may include a fifth component comprising an approximately 5,5fH subcarrier signal frequency modulated in accordance with a first information signal and a sixth component comprising an approximately 6.5fH sub- carrier signal frequency modulated in accordance with a second information signal. In an alternate embodiment, the fourth and fifth components are replaced by a 5fH subcarrier signal frequency modulated according to the third audio signal. The composite baseband signal is used to frequency modulate a transmitted main audio RF carrier, the transmitted signal being detected by receiving circuits for reproducing the stereophonic audio signals, the third audio signal and the first and second information signals.
380579
Eilers Carl G.
Fockens Pieter
Macrae & Co.
Zenith Radio Corporation
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