CA2233624A1 - Speech-operated noise attenuation device (sonad) control system method and apparatus - Google Patents

Speech-operated noise attenuation device (sonad) control system method and apparatus

Info

Publication number
CA2233624A1
CA2233624A1 CA002233624A CA2233624A CA2233624A1 CA 2233624 A1 CA2233624 A1 CA 2233624A1 CA 002233624 A CA002233624 A CA 002233624A CA 2233624 A CA2233624 A CA 2233624A CA 2233624 A1 CA2233624 A1 CA 2233624A1
Authority
CA
Canada
Prior art keywords
sonad
control system
speech
system method
noise attenuation
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
CA002233624A
Other languages
French (fr)
Other versions
CA2233624C (en
Inventor
Enrique Ferrer
Charles R. Ruelke
Andrew J. Webster
Kenneth A. Hansen
Kevin B. Traylor
Rajesh H. Zele
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.)
Motorola Solutions Inc
Original Assignee
Motorola 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 Motorola Inc filed Critical Motorola Inc
Publication of CA2233624A1 publication Critical patent/CA2233624A1/en
Application granted granted Critical
Publication of CA2233624C publication Critical patent/CA2233624C/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers without distortion of the input signal
    • H03G3/20—Automatic control
    • H03G3/30—Automatic control in amplifiers having semiconductor devices
    • H03G3/34—Muting amplifier when no signal is present or when only weak signals are present, or caused by the presence of noise signals, e.g. squelch systems
    • H03G3/341—Muting when no signals or only weak signals are present
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers without distortion of the input signal
    • H03G3/001—Digital control of analog signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/06—Receivers
    • H04B1/16—Circuits
    • H04B1/1646—Circuits adapted for the reception of stereophonic signals
    • H04B1/1661—Reduction of noise by manipulation of the baseband composite stereophonic signal or the decoded left and right channels

Abstract

A SONAD (110) control system (100) detects a received signal strength (RSSI) for a radio frequency (RF) signal (102), selects a threshold transfer function (400-404) in response thereto, generates a threshold control signal in response to the transfer function, and utilizes the threshold control signal to select the SONAD threshold value. During operation, the control system (100) decreases the attenuation of background noise levels for weak RF signals.
CA002233624A 1997-04-29 1998-03-30 Speech-operated noise attenuation device (sonad) control system method and apparatus Expired - Lifetime CA2233624C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US08/841,242 1997-04-29
US08/841,242 US6115589A (en) 1997-04-29 1997-04-29 Speech-operated noise attenuation device (SONAD) control system method and apparatus

Publications (2)

Publication Number Publication Date
CA2233624A1 true CA2233624A1 (en) 1998-10-29
CA2233624C CA2233624C (en) 2002-11-19

Family

ID=25284388

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002233624A Expired - Lifetime CA2233624C (en) 1997-04-29 1998-03-30 Speech-operated noise attenuation device (sonad) control system method and apparatus

Country Status (3)

Country Link
US (1) US6115589A (en)
CA (1) CA2233624C (en)
GB (1) GB2327022B (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6980592B1 (en) * 1999-12-23 2005-12-27 Agere Systems Inc. Digital adaptive equalizer for T1/E1 long haul transceiver
US7225001B1 (en) * 2000-04-24 2007-05-29 Telefonaktiebolaget Lm Ericsson (Publ) System and method for distributed noise suppression
US20060153405A1 (en) * 2005-01-13 2006-07-13 Myers Bruce A Audio automatic volume control
US20080144838A1 (en) * 2005-08-25 2008-06-19 Raines Janet S Tamper resistant audio sound level detector and informative device
KR100638337B1 (en) * 2005-09-05 2006-10-24 주식회사 비손하이테크 Apparatus and method for noise removal and mobile phone with noise removal function
KR102006734B1 (en) * 2012-09-21 2019-08-02 삼성전자 주식회사 Method for processing audio signal and wireless communication device
CN109003622B (en) * 2018-09-11 2021-06-04 广州小鹏汽车科技有限公司 Noise reduction processing method and device, radio and vehicle

Family Cites Families (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3851253A (en) * 1973-05-25 1974-11-26 Motorola Inc Automatically adjustable fm receiver squelch
US4052568A (en) * 1976-04-23 1977-10-04 Communications Satellite Corporation Digital voice switch
WO1987006072A1 (en) * 1986-04-03 1987-10-08 Motorola, Inc. Fm receiver with noise suppression during rayleigh faded received signals
US4792991A (en) * 1986-04-03 1988-12-20 Motorola, Inc. FM receiver having improved audio quality in response to Rayleigh faded received signals
JPH0748695B2 (en) * 1986-05-23 1995-05-24 株式会社日立製作所 Speech coding system
US4759071A (en) * 1986-08-14 1988-07-19 Richards Medical Company Automatic noise eliminator for hearing aids
US4811404A (en) * 1987-10-01 1989-03-07 Motorola, Inc. Noise suppression system
US5036540A (en) * 1989-09-28 1991-07-30 Motorola, Inc. Speech operated noise attenuation device
US5226178A (en) * 1989-11-01 1993-07-06 Motorola, Inc. Compatible noise reduction system
US5083304A (en) * 1990-09-28 1992-01-21 Motorola, Inc. Automatic gain control apparatus and method
US5303406A (en) * 1991-04-29 1994-04-12 Motorola, Inc. Noise squelch circuit with adaptive noise shaping
US5321849A (en) * 1991-05-22 1994-06-14 Southwestern Bell Technology Resources, Inc. System for controlling signal level at both ends of a transmission link based on a detected valve
FI94564C (en) * 1992-02-14 1995-09-25 Nokia Deutschland Gmbh Active noise suppression system
JP3218736B2 (en) * 1992-11-06 2001-10-15 ソニー株式会社 Receivers and space diversity receivers
EP0731569A2 (en) * 1993-03-10 1996-09-11 National Semiconductor Corporation Radio frequency telecommunications transceiver
US5384547A (en) * 1993-08-02 1995-01-24 Motorola, Inc. Apparatus and method for attenuating a multicarrier input signal of a linear device
US5564090A (en) * 1993-09-09 1996-10-08 Lockheed Martin Ims Corporation Method and apparatus for dynamically adjusting receiver squelch threshold
US5583891A (en) * 1994-10-31 1996-12-10 Motorola, Inc. Noise attenuation circuit for amplitude modulated radio and method therefor
US5697081A (en) * 1995-09-12 1997-12-09 Oki Telecom, Inc. Intermodulation distortion reduction circuit utilizing variable attenuation
US5706356A (en) * 1996-05-01 1998-01-06 Walden; Gaylord K. Audio processor

Also Published As

Publication number Publication date
GB2327022A (en) 1999-01-06
GB9809388D0 (en) 1998-07-01
GB2327022B (en) 1999-12-22
CA2233624C (en) 2002-11-19
US6115589A (en) 2000-09-05

Similar Documents

Publication Publication Date Title
CA2189505A1 (en) Method for Controlling a Diversity Receiver Apparatus in a Radio Subscriber Unit
CA2189720A1 (en) Cdma radio subscriber unit having a switched antenna diversity apparatus and method therefore
MY113030A (en) Clear channel selection system for a cordless telephone
EP2246994A3 (en) System and method for detection and selection of multiple antenna
EP0667062A4 (en) Expanded microcomputer system for controlling radio frequency interference.
CA2536517A1 (en) Electronic location monitoring system
MX9605913A (en) Dual mode radio subscriber unit having a diversity receiver apparatus and method therefor.
CA2309721A1 (en) Diversity reception system
KR950012945B1 (en) Fm receiver with noise su££ression during rayleigh faded received signals
WO2000033475A3 (en) Method and apparatus for reverse link loading estimation
WO2000031893A3 (en) Method and apparatus for power control based on the probability that the power control command is in error
EP0975185A4 (en) Transmission power control method, mobile phone, base station, and recording medium
GB2293075B (en) Burst serial tone waveform signalling,and squelch/wake-up control of HF transceiver
WO1996001544A3 (en) A reception method, and a receiver
GB2250403A (en) Method of preventing suppresion of sensitivity of a receiver and method of preventing radio interference
GB9717006D0 (en) Radio selective calling receiver using time diversity reception
WO2000016499A8 (en) Method of directive transmission and directivity-controlled communication device
CA2392871A1 (en) Allocation of channels to radio transceivers
CA2282582A1 (en) Wireless communication device and system incorporating location-determining means
CA2207965A1 (en) Radio loop-back test method having improved reliability and a system using the test method
WO2002073825A3 (en) Method and apparatus for tracking signals in a wireless communication system
EP0319099A1 (en) Paging system with paging receivers controlled depending on location
CA2233624A1 (en) Speech-operated noise attenuation device (sonad) control system method and apparatus
WO2001058014A3 (en) Measuring antenna signal strength with automatic gain control receiver
CA2208513A1 (en) Receiver with an antenna switch, in which sensitivity and quality of reception is improved

Legal Events

Date Code Title Description
EEER Examination request
MKEX Expiry

Effective date: 20180403