Audibility-control system for radio receiver

Communications: electrical – Selective – Having indication or alarm

Patent

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Details

343225, G08G 100

Patent

active

040064476

ABSTRACT:
A radio receiver, especially one installed in a road vehicle, has a first section for picking up special message signals such as road-traffic information and a second section for picking up a normal radio program. A relay energizable by the special signals, normally connected to the first receiver section, automatically switches a loudspeaker from the second receiver section to the first one whenever such signals begin to arrive. A circuit breaker in series with the relay can be manually controlled by a pushbutton, through the intermediary of a bistable storage circuit, to deactivate the relay for shifting back to audible reproduction of the normal program at the will of the user even while the special message signals continue to arrive; another actuation of the pushbutton in the presence of these signals restores the original condition. Continuing reception of the special message signals, detected by a sensor connected across the circuit breaker, is visually indicated by a luminous display which is continuously illuminated during reproduction of the signals and which flashes during reproduction of the normal program.

REFERENCES:
patent: 2347477 (1944-04-01), Halstead
patent: 2429607 (1947-10-01), Capen
patent: 2442851 (1948-06-01), Halstead
patent: 3098975 (1963-07-01), Schneiderman
patent: 3144610 (1964-08-01), Phillips
patent: 3226601 (1965-12-01), Cramer et al.
patent: 3257617 (1966-06-01), Goldmark et al.
patent: 3363250 (1968-01-01), Jacobson
patent: 3400392 (1968-09-01), Willcox et al.
patent: 3701024 (1972-10-01), Knowles et al.
patent: 3832636 (1974-08-01), Kubo
patent: 3876940 (1975-04-01), Wickford et al.

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