US 6,188,978 B1Granted

Voice encoding/decoding apparatus coping with modem signal

AssigneeNEC Corporation

InventorRyoichi Harada

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Abstract

A voice encoding/decoding apparatus includes a voice encoding unit and a voice decoding unit. In the voice encoding unit, a non-voice signal detector detects whether an input signal is a voice signal or a non-voice signal and outputs a signal identification signal on the basis of the detection result. When the non-voice signal detector detects a voice signal, a voice encoder encodes the input signal as the voice signal and transmits encoded data to the voice decoding unit. When the non-voice signal detector detects a non-voice signal, the voice encoding unit transmits the input signal to the voice decoding unit as non-encoded transmission data. The voice decoding unit includes a voice decoder and a first switch. When the non-voice signal detector detects the voice signal, the voice decoder decodes the encoded data transmitted from the voice encoder and outputs the decoded voice signal. The first switch selects, on the basis of the signal identification signal output from the non-voice signal detector, the decoded voice signal or the non-encoded transmission data.

Claims14

Dependent claims

An apparatus for distinguishing between a voice signal and a non-voice signal prior to transmission comprising:

a voice encoding unit for encoding a voice signal and a voice decoding unit for decoding the encoded voice signal transmitted from said voice encoding unit,
said voice encoding unit comprising:
signal detection means for detecting whether an input signal is a voice signal or a non-voice signal and outputting a signal identification signal on the basis of the detection result;
and
voice encoding means for, when said signal detection means detects a voice signal, encoding the input signal as the voice signal and transmitting encoded data to said voice decoding unit,
wherein when said signal detection means detects a non-voice signal, said voice encoding unit transmits the input signal directly to said voice decoding unit as non-encoded transmission data thus bypassing said voice encoding means;
and
said voice decoding unit comprising;
voice decoding means for, when said signal detection means detects the voice signal, decoding the encoded data transmitted from said voice encoding means and outputting the decoded voice signal, and
first switching means for selecting, on the basis of the signal identification signal output from said signal detection means, one of the decoded voice signal output from said voice decoding means and the non-encoded transmission data transmitted from said voice encoding unit.

7 more elements

Dependencies are inferred from the claim text.

Facts

Application: 09/221,824Filed 28 Dec 1998
Priority: JP 2-01804113 Jan 1998
Granted: 13 Feb 2001
Term ends: Not estimatedThe source records don’t support an estimate.

Classification7 codes

H04Q 11/04
Selecting arrangements for multiplex systems: for time-division multiplexing
H04M 11/06
Telephonic communication systems specially adapted for combination with other electrical systems: simultaneous speech and data transmission, e.g.…
G10L 25/78
Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00: detection of presence or absence of voice signals
H04M 3/42382
Systems providing special services or facilities to subscribers: text-based messaging services in telephone networks such as PSTN/ISDN, e.g.…