Radio receiver with two different traffic information decoders
First Claim
1. Radio broadcast receiver capable of receiving traffic information modulated on any subcarrier which is in turn modulated on the broadcast carrier for receiving either of both of two different kinds of traffic information modulation that they be provided on said subcarrier, comprising:
- a first traffic signal decoder (22) for decoding traffic information signals provided in analog modulation and said subcarrier including those designating patient and regional identification of the traffic information;
a second traffic information decoder (28) for decoding a digitally incoded traffic information modulated on said subcarrier by double-sideband suppressed-carrier modulation, said second decoder including speech synthesizer means for providing an output of said second decoder into a form readily convertible into intellegible audible signals;
program detection means (20);
means for audio frequency amplification and for converting amplified signals into audible information, suitable for connection to the respective outputs of said broadcast detection means, said first decoder and said second decoder;
automatic switch means responsive to the presence of a traffic information signal in a said decoder for disconnecting said audio frequency amplifier from said broadcast signal detector means during the presence of a traffic information signal and for leaving said audio frequency amplifier connected to said detector means in the absence of a traffic information signal, andselector switch means both for selectively connecting as of the output of said first decoder or the output of said second decoder to said audio frequency amplifier means at least when a traffic information signal is presented on said subcarrier.
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Accused Products
Abstract
An autombile radio capable of receiving VHF entertainment programs from a station in which traffic information signals are modulated in a 57 kHz subcarrier is equipped with two decoders for the 57 kHz subcarrier signals, one decoder for traffic information signals modulated in an analog fashion on the subcarrier and another decoder for digital signals modulated on that subcarrier by double-sideband suppressed-carrier modulation. The first decoder is for a system already in use in which traffic information, at least if urgent, is intended to override the entertainment program, and the receivier has the usual circuits for that override. The second decoder is for a system that is planned but not yet in use in which the received digital signals can call out one or more standard messages or message portions from a read-only memory and either the memory addresses or the memory outputs are storable. They are made audible by speech synthesizer and, because they are stored at least until the next message comes in, can be recalled if the user wishes. The receiver switch for turning on the traffic information feature is a selector switch with positions selecting either type of decoder and, in a modification designed for where both systems are available, the corresponding switching system gives priority to the presently existing system, since the output of the other system will not be lost and can be reproduced when the signals of the existing system have ceased.
48 Citations
16 Claims
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1. Radio broadcast receiver capable of receiving traffic information modulated on any subcarrier which is in turn modulated on the broadcast carrier for receiving either of both of two different kinds of traffic information modulation that they be provided on said subcarrier, comprising:
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a first traffic signal decoder (22) for decoding traffic information signals provided in analog modulation and said subcarrier including those designating patient and regional identification of the traffic information; a second traffic information decoder (28) for decoding a digitally incoded traffic information modulated on said subcarrier by double-sideband suppressed-carrier modulation, said second decoder including speech synthesizer means for providing an output of said second decoder into a form readily convertible into intellegible audible signals; program detection means (20); means for audio frequency amplification and for converting amplified signals into audible information, suitable for connection to the respective outputs of said broadcast detection means, said first decoder and said second decoder; automatic switch means responsive to the presence of a traffic information signal in a said decoder for disconnecting said audio frequency amplifier from said broadcast signal detector means during the presence of a traffic information signal and for leaving said audio frequency amplifier connected to said detector means in the absence of a traffic information signal, and selector switch means both for selectively connecting as of the output of said first decoder or the output of said second decoder to said audio frequency amplifier means at least when a traffic information signal is presented on said subcarrier. - View Dependent Claims (2, 3, 4, 5, 6, 7, 9, 10, 11, 13, 14, 15)
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- 8. Radio broadcast receiver as defined in claimed 4, wherein said second decoder includes storage means capable of storing traffic information at least partially decoded by said second decoder until a subsequent traffic information message is at least partially decoded.
Specification