CA2136365A1 - Background Noise Compensation in a Telephone Set - Google Patents

Background Noise Compensation in a Telephone Set

Info

Publication number
CA2136365A1
CA2136365A1 CA2136365A CA2136365A CA2136365A1 CA 2136365 A1 CA2136365 A1 CA 2136365A1 CA 2136365 A CA2136365 A CA 2136365A CA 2136365 A CA2136365 A CA 2136365A CA 2136365 A1 CA2136365 A1 CA 2136365A1
Authority
CA
Canada
Prior art keywords
speech signal
signal
background noise
gain factor
subband
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA2136365A
Other languages
French (fr)
Other versions
CA2136365C (en
Inventor
Jonathan Brandon Allen
Donald Joseph Youtkus
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
AT&T Corp
Original Assignee
American Telephone and Telegraph Co Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by American Telephone and Telegraph Co Inc filed Critical American Telephone and Telegraph Co Inc
Publication of CA2136365A1 publication Critical patent/CA2136365A1/en
Application granted granted Critical
Publication of CA2136365C publication Critical patent/CA2136365C/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/58—Anti-side-tone circuits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/60—Substation equipment, e.g. for use by subscribers including speech amplifiers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/02—Constructional features of telephone sets
    • H04M1/19—Arrangements of transmitters, receivers, or complete sets to prevent eavesdropping, to attenuate local noise or to prevent undesired transmission; Mouthpieces or receivers specially adapted therefor

Abstract

An automated method for modifying a speech signal communicated over a telephone network by applying a gain factor in a telephone set before any side tone is added thereto. The gain factor is a function of a received signal indicative of the background noise at the location of the telephone set. The gain applied may be a function of both the background noise level and the original speech signal. Either a linear or a non-linear (e.g., compressed) amplification of the original speech signal may be performed, where a compressed amplification results in the higher level portions of the speech signal being amplified by a smaller gain factor than lower level portions. The speech signal may be separated into a plurality of subbands, each resultant subband signal being individually modified in accordance with the present invention. In this case, each subband speech signal is amplified by a gain factor based on a corresponding subband noise signal, generated by separating the background noise signal into a corresponding plurality of subbands. The individual modified subband signals may then be combined to form the resultant modified speech signal.
CA002136365A 1993-12-29 1994-11-22 Background noise compensation in a telephone set Expired - Lifetime CA2136365C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US08/175,038 US5526419A (en) 1993-12-29 1993-12-29 Background noise compensation in a telephone set
US175,038 1993-12-29

Publications (2)

Publication Number Publication Date
CA2136365A1 true CA2136365A1 (en) 1995-06-30
CA2136365C CA2136365C (en) 1999-04-20

Family

ID=22638582

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002136365A Expired - Lifetime CA2136365C (en) 1993-12-29 1994-11-22 Background noise compensation in a telephone set

Country Status (5)

Country Link
US (2) US5526419A (en)
EP (1) EP0661858A3 (en)
JP (1) JP4082745B2 (en)
KR (1) KR100323164B1 (en)
CA (1) CA2136365C (en)

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Also Published As

Publication number Publication date
JPH07212435A (en) 1995-08-11
KR100323164B1 (en) 2002-06-20
EP0661858A3 (en) 1999-04-28
EP0661858A2 (en) 1995-07-05
CA2136365C (en) 1999-04-20
US5553134A (en) 1996-09-03
KR950022572A (en) 1995-07-28
JP4082745B2 (en) 2008-04-30
US5526419A (en) 1996-06-11

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Effective date: 20141124