IV SAP/stereo audio system
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United States of America Patent
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-
Aug 18, 1987
Grant Date -
N/A
app pub date -
Dec 19, 1985
filing date -
Dec 19, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A TV SAP/stereo audio system includes a DC switch for selectively coupling the output of a stereo decoder and the output of a SAP detector to a stereo amplifier. A DC voltage, representative of the SAP carrier level, is developed and applied to a pair of threshold transistors. The lower threshold transistor is driven conductive when the DC voltage is below a first voltage and the upper threshold transistor is driven conductive when the DC voltage is above a second voltage. The threshold voltages are established by a pair of voltage dividers. A SAP control transistor is coupled to the collectors of the threshold transistors and is driven conductive when either threshold transistor is in conduction. The SAP control transistor is connected to the DC switch and prevents coupling of the SAP detector output to the stereo amplifier when it is conducting. A stereo cutoff transistor is coupled to the SAP control transistor for enabling the DC switch to couple the output of the stereo decoder to the stereo amplifier when a SAP mode is selected by a selector switch and the SAP control transistor is conducting.
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