H - Electricity – 04 – B
Patent
H - Electricity
04
B
H04B 1/40 (2006.01) H03G 7/00 (2006.01) H04Q 7/32 (2006.01)
Patent
CA 2068254
In a mobile telephone device, an adder (17) calculates a sum of (a) an audio signal comprising a talk signal component and a noise component and (b) a generated signal having an out-of audio frequency, as 6 kHz, and a predetermined level and supplies a compressor (21) with the sum as its input signal, The adder and the compressor give a less variable gain to the audio signal of a lower level range than to that of a higher level range. Alternatively, the co?pressor alone gives the less-variable gain to the input signal of the lower level range. A compressed signal is transmitted to a base station as a radio signal and is expanded. For use in a radio communication system of the type revealed in United States Patent No. 4,025,853, the generated signal can be given either by the supervisory audible tone or by the reference tone.
Corporation Nec
Smart & Biggar
LandOfFree
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