FM Receiver for general programs and special announcements
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Mar 6, 1984
Grant Date -
N/A
app pub date -
Nov 9, 1981
filing date -
May 27, 1981
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
To improve reliability of recognition of an announcement recognition (AR) signal radiated by a transmitter upon broadcasting an announcement (e.g. traffic information, news, etc.), in the form of AM modulation of a 57 kHz auxiliary subcarrier, in which the subcarrier may also be modulated by other control signals, the subcarrier is filtered in the receiver, demodulated, and the degree of all modulations, regardless of frequency, on the subcarrier is sensed, and if the modulation changes significantly, for example rises from 60% modulation to 90% modulation (50% change), a switch (4) is activated which inhibits transmission of audio programs from an external source, such as a tape recorder (5), tuner tuned to another station, or the like, and reproduces the announcement being broadcast; termination of the AR signal, forming the AR modulation on the subcarrier, causes the switch to revert for reproduction of previously controlled audio information.
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