Title: Receiving reproducing system

Abstract: A receiving reproducing system for an automotive radio detects the surrounding noise level other than the output sound thereof, in the sound field extending in the passenger compartment of an automobile, and the level which is dependent upon the received signal level of an antenna. The receiving reproducing system partly controls its output sound volume proportionally in accordance with the surrounding noise level and partly lowers its output sound volume in dependence upon the reduction in the received signal level. Even under the circumstances where the surrounding noise level is high and where the received signal level is low, the sound volume of the output sound containing many noises can be prevented from being raised.

Do you think this is a good invention? Vote now:

Votes so far: For:(0) Against:(0)
Other info:

Inventors: Inoue, Takao (Kodaira, JP)

Application Number: 06/233869
Filing Date: 1981-02-12
Publication_date: 1983-04-19
Assignee: HITACHI LTD (JP)

Primary Class(es): 455/143 455/212, 455/238.100, 455/219, 381/86, 704/270, 455/2
Other Classes: H03G3/32; H03G3/24; H04B1/10
US Patent Ref:

2409058	October, 1946	Mitchell	455/238	Control system for wave-signal receivers
3374437	March, 1968	Heald	455/212	Squelch system for radio receivers
3497622	February, 1970	Markin et al.	179/1	AUTOMATIC GAIN CONTROL
3673499	June, 1972	Avins et al.	455/155	COMBINED TUNING AND SIGNAL STRENGTH INDICATOR CIRCUIT WITH SIGNAL STRENGTH INDICATION DERIVED FROM EACH IF AMPLIFYING STAGE
3679979	July, 1972	Krepps, Jr. et al.	455/155	AM, FM, AND FM STEREO TUNER HAVING SIMPLIFIED AM TO FM SWITCHING MEANS
3821649	June, 1974	Grosjean	455/155
4037057	July, 1977	Ogita et al.	179/1GJ	Noise-cancelling apparatus for FM stereo receiver
4061874	December, 1977	Fricke et al.	179/1P	System for reproducing sound information
4198603	April, 1980	Aldridge et al.	179/1VL	Radio receiver audio attenuator
4254303	March, 1981	Takizawa	179/1P	Automatic volume adjusting apparatus

Other Refs: DE1282746DE2403986DE2522381DE2648901DE2118350DE2361651DE2743720DE2934593GB485005GB2029141GB1564282GB2042836

November, 1968
July, 1975
December, 1976
May, 1978
October, 1978
January, 1979
April, 1979
February, 1980
May, 1938
March, 1980
April, 1980
September, 1980

Other References: Electronik Praxis-"Ein Filter Hoher _Gute mit Negativimpedanz"and Gerauschgesteurte Lautstarke-Einstellschaltung, Ullrich Bollinger-May 1976, No. 5, p. 104.

Primary Examiner: Bookbinder, Marc E.
Assistant Examiner:
Attorney: Antonelli, Terry & Wands

Claims: