Electrical audio signal processing systems and devices – Including frequency control
Patent
1981-07-20
1984-07-17
Pellinen, A. D.
Electrical audio signal processing systems and devices
Including frequency control
381109, 455232, 455233, H03G 502
Patent
active
044610262
ABSTRACT:
A pushbutton tunable radio having an integral audio graphic equalizer is disclosed. During a tuning mode of operation for the radio actuation of any of five presettable pushbuttons results in the selection of a predetermined radio channel frequency within the AM or FM band, and a five digit display is provided indicating the selected channel frequency. During an equalizer mode of operation caused by actuation an equalizer mode selecting pushbutton, the radio remains tuned to the previously selected radio channel, but the frequency indicating display is now replaced by an electronic display indicating the relative emphasis of a plurality of subbands for the corresponding audio signals produced in response to the received radio channel. In the equalizer mode, actuation of any of the presettable radio pushbuttons results in selecting a corresponding one of the audio subbands for adjustment of its relative emphasis. The radio includes up and down manual pushbutton switches which provide for tuning the radio in discrete tuning increments in either upward or downward directions during the tuning mode of the radio. During the equalizer mode, after one of the subbands has been selected by actuation of one of the presettable pushbuttons, actuation of the up or down tuning pushbuttons will cause a corresponding upward or downward discrete increment adjustment of the relative emphasis of the selected one of the audio subbands.
REFERENCES:
patent: 3803494 (1974-04-01), Howell et al.
patent: 4087793 (1978-05-01), Lucas
patent: 4292467 (1981-09-01), Dollen et al.
patent: 4317222 (1982-02-01), Bell et al.
Dwyer James L.
Gillman James W.
Melamed Phillip H.
Motorola Inc.
Pellinen A. D.
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