Audibility enhancement

Details Audibility enhancement Audibility enhancement

2006-08-15

2006-08-15

Tran, Sinh (Department: 2646)

Telephonic communications

Substation or terminal circuitry

For loudspeaking terminal

C379S395000

Reexamination Certificate

active

07092514

ABSTRACT:
An apparatus for enhancing audibility of a far-end speech signal from a far-end user to a near-end user in a telephony system includes a near-end background noise signal level estimator (26) at the near-end user. A near-end speech signal level estimator (24) is also provided at the near-end user. A gain control logic (22) determines a gain (G) for amplification of the far-end speech signal based on both estimated speech and background noise signal levels.

REFERENCES:
patent: 5357567 (1994-10-01), Barron et al.
patent: 5524148 (1996-06-01), Allen et al.
patent: 5612996 (1997-03-01), Li
patent: 5615256 (1997-03-01), Yamashita
patent: 6205217 (2001-03-01), Nobusawa
patent: 00/39991 (2000-07-01), None
ITU-T Recommendation P.56, “Telephone Transmission Quality Objective Measuring Apparatus”, “Objective Measurement of Active Speech Level”, International Telecommunication Union, Mar. 1993.
ITU-T Recommendation G.121, “Transmission Systems and Media; General Characteristics of National Systems Forming Part of International Connections”, Loudness Ratings (LRs) of Naitonal Systems, Mar. 1993.

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