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| Low power, slew rate insensitive power-on reset circuit |
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| Programmable voltage controlled ring oscillator |
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| Symmetrical waveform signal generator having coherent frequency shift capability |
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| Constant duty cycle, frequency programmable clock generator |
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| Programmable frequency divider |
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Traffic information radio signal receiver
| Details |
Inventors: Liman, Helmut;
Assignee: Blaupunkt-Werke GmbH (Hildesheim, DE)
Primary Examiner: Ng; Jin F.
Assistant Examiner:
Attorney, Agent or Firm: Frishauf, Holtz, Goodman & Woodward
To simulate presence of a traffic information signal in a traffic information receiver which is muted upon reproduction of tape cassette programs or operated at a predetermined level, a momentary-operating control button is connected to a timing circuit to establish a timing interval which, when exceeded, provides a signal to a traffic information transfer switch to transfer the signals received from the receiver through the traffic information channel to permit setting of the volume level under traffic information conditions as desired and to demonstrate the operability under such conditions; upon release of the button, the system reverts to reproduction of tape or traffic information signals received by the receiver. Traffic information can thus be simulated even though no traffic information is being radiated by the transmitter to which the receiver is tuned. |
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DETAILED DESCRIPTION I claim: 1.
In a radio receiver having a radio signal receiving stage (10) providing program signals and traffic information signals, an audio stage providing audio output signals, a traffic information decoder (16) responsive to predetermined signals received by said receiving stage and then providing a corresponding traffic information control signal; a transfer circuit (18) connected to the radio receiving stage (10) and the audio stage to transfer signals from the receiving stage to the audio stage, and being connected to and controlled by the traffic information control signal to, selectively, inhibit transfer of program signals and instead transfer traffic information signals to the audio stage; and a control switch (20, 22) controlling, respectively, response of the decoder (16) and hence selective transfer of program signals and/or information signals to the audio stage, an information signal reproduction level simulation circuit to simulate traffic information signals for reproduction by the audio stage in the absence of said predetermined signals to which the decoder (16) responds, comprising a timing element (24) connected to and controlled by said control switch and upon operation thereof for at least a predetermined time interval providing an output; and connection means (54, 26) controlled by said timing element output after elapse of the predetermined interval to apply a traffic information simulating signal to said transfer circuit (16) for subsequent reproduction by the audio stage.
2.
Radio receiver according to claim 1, wherein said connection means include an OR-gate (26; V1, V2, R1) connected to the timing element (24) and to the decoder (16) for selective control of the transfer circuit (18) by either said traffic information control signal or an output signal from said timing element.
3.
Radio receiver according to claim 2, wherein said decoder (16) includes a transistor (V1); and wherein the OR-gate (26) includes said transistor as a component thereof
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