Telephone having a speech band limiting function

Details Telephone having a speech band limiting function Telephone having a speech band limiting function

1995-03-27

1998-08-11

Tsang, Fan S.

Telephonic communications

Substation or terminal circuitry

Conversion of signal form

379360, 381 711, 381 941, 455422, 455425, H04M 1100, H03B 2900

Patent

active

057938636

ABSTRACT:
In a telephone, a speech band switching circuit selectively provides a received speech with one of a plurality of frequency characteristics. A sensing circuit senses the level of noise around the telephone. A speech band control circuit compares the noise level sensed by the sensing circuit with a predetermined level and controls the speech band switching circuit on the basis of the result of comparison. When the noise level is higher than the predetermined level, the control circuit sends a control signal to the switching circuit. In response, the switching circuit selects a high-pass filter in place of a low-pass filter. As a result, a received speech is easy to hear despite the noise around the telephone because the low frequency range thereof is filtered out.

REFERENCES:
patent: 5201004 (1993-04-01), Fujiwara et al.
patent: 5432859 (1995-07-01), Yang et al.
patent: 5640685 (1997-06-01), Komoda

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