Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1986-01-03
1987-02-24
Groody, James J.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358197, 358198, 381 1, 381 2, 381 10, 455202, 455205, H04N 704
Patent
active
046461507
ABSTRACT:
An apparatus and method are provided for receiving and reproducing stereo television sound. A transmitted television signal is received that contains a first component comprising the sum of first and second stereophonically related audio signals and a second component comprising the difference between the first and second stereophonically related audio signals. The first and second components are converted to produce a first sound carrier centered at a first intermediate frequency and a second sound carrier centered at a second intermediate frequency. The first component is detected from the first sound carrier at the first intermediate frequency. The second component is detected from the second sound carrier at the second intermediate frequency. The detected first and second components are combined to produce a left channel audio output and a right channel audio output. By using a standard intercarrier detector for the first (L+R) component and an independent FM detector for the second (L-R) component, distortion caused by interfering harmonics of the television horizontal line frequency with vertical scan frequency sidebands falling within the (L-R) subchannel is prevented. A second audio program ("SAP") signal can also be recovered using the independent FM detector to avoid such distortion.
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"Television Multichannel Sound Broadcasting--A Proposal", by Carl G. Eilers, IEEE Transactions on Consumer Electronics, vol. CE-27, No. 3, pp. 398-409, (Aug. 1981).
Marz Daniel J.
Robbins Clyde
General Instrument Corporation
Groody James J.
Lipsitz Barry R.
Parker Michael D.
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