KR940020743A - How to Detect Initiation of Telephone Call on a Full Duplexer Speaker Phone - Google Patents

How to Detect Initiation of Telephone Call on a Full Duplexer Speaker Phone Download PDF

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Publication number
KR940020743A
KR940020743A KR1019930001496A KR930001496A KR940020743A KR 940020743 A KR940020743 A KR 940020743A KR 1019930001496 A KR1019930001496 A KR 1019930001496A KR 930001496 A KR930001496 A KR 930001496A KR 940020743 A KR940020743 A KR 940020743A
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KR
South Korea
Prior art keywords
level
equal
predetermined
signal
predetermined time
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Application number
KR1019930001496A
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Korean (ko)
Inventor
신민철
Original Assignee
백중영
금성통신 주식회사
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Priority to KR1019930001496A priority Critical patent/KR940020743A/en
Publication of KR940020743A publication Critical patent/KR940020743A/en

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  • Telephone Function (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)

Abstract

본 발명은 양방향 동시 통화를 하는 풀 듀플렉서(full duplexer) 스피커 폰에 관한 것으로, 전기적으로 에코신호와 음향적인 에코신호를 제거하기위한 디지탈 신호 처리 시작점을 결정할 수 있도록 전화 통화 개시점을 검출하는 폴듀플렉서 스피커폰의 전화 통화 개시점 검출 방법에 관한 것이다.The present invention relates to a full duplexer speaker phone for two-way simultaneous communication, and a pole duplexer for detecting a telephone call initiation point to determine a digital signal processing start point for electrically canceling an echo signal and an acoustic echo signal. The present invention relates to a method for detecting a telephone call start point of a speakerphone.

본 발명은 전기적인 에코 신호와 음향적인 에코신호를 제거하기 위한 디지탈 신호 처리 시작점을 결정 할수 있도록 통화 시작점을 정확히 검출하므로, 양방향 동시통화를 하는 풀 듀플렉서 스피커폰을 구현 할 수 있다.The present invention accurately detects a call start point so as to determine a digital signal processing start point for removing an electric echo signal and an acoustic echo signal, thereby realizing a full duplexer speakerphone for bidirectional simultaneous calls.

Description

풀 듀플렉서 스피커 폰의 전화 통화 개시점 검출 방법How to Detect Initiation of Telephone Call on a Full Duplexer Speaker Phone

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음Since this is an open matter, no full text was included.

제1도는 본 발명에 의한 풀 듀플렉서 스피커폰의 전화 통화 개시점 검출 방법을 설명하기 위한 흐름도.1 is a flowchart illustrating a method for detecting a telephone call initiation point of a full duplexer speakerphone according to the present invention.

Claims (1)

풀 듀플렉서 스피커폰에 있어서, 다이얼링하여 통화시도하면 적응필터의 모드를 유한 탭모드로 전환하여 상대방 링 백톤 주파수인440HZ와 480HZ를 중심주파수로 가지는 대역 통과 필터를 구성하는 제1단계, 이 제1단계 수행후 상기 대역통과 필터의 출력을 제1소정시간을 주기로 체크하여 440HZ와480HZ 신호의 레벨을 측정하는 제2단계, 이 제2단계 수행후 상기 440HZ와 480HZ 신호의 레벨이 제1소정레벨 이상인지를 판단하는 제3단계, 이 제3단계 수행후 상기 440HZ와 480HZ신호의 레벨이 상기 제1소정레벨 이상이 아니면 상기 제2단계로 진입하는 제4단계, 상기 제3단계 수행후 440HZ와 480HZ신호의 레벨이 상기 제1소정 레벨 이상이면 상대방이 호출된 것으로 인지하여 음성통화 시작점 추출 알고리즘을 이행하는 제5단계, 이 제5단계 수행후 상기 제1소정 시간을 주기로 440HZ와 480HZ 신호의 레벨을 측정하여 제2소정레벨 이하인지를 판단하는 제6단계, 이제6단계 수행후 상기 440HZ와 480HZ신호의 레벨이 제2소정레벨 이하가 아니면 상기 제5단계로 진입하는 제7단계, 상기 제6단계 수행 후 상기 440HZ와 480HZ 신호의 레벨이 제2소정레벨이하이면 제2소정시간동안 입력되는 신호의 절대치를 측정하고 평균값을 계산하여 상기 제2소정시간동안 입력된 신호의 절대치 평균값이 제3레벨 이상인지를 판단하는 제8단계 이제8단계 수행후 상기제2소정 시간동안 입력된 신호의 절대치 평균값이 제3레벨이상이 아니면 상기 제5단계로 진입하는 제9단계, 상기 제8단계 수행후 상기 제2소정 시간 동안 입력된 신호의 절대치 평균 값이 제3소정레벨 이상이면 이때를 음성 통화시점으로 인지하는 제 10단계를 포함하는 것을 특징으로 하는 풀 듀플렉서 스피커 폰의 전화 통화 개시점 검출 방법.In a full duplexer speakerphone, a first step of configuring a band pass filter having a center frequency of 440HZ and 480HZ of ring backtone frequencies as a center frequency by switching the mode of the adaptive filter to a finite tap mode when dialing and attempting a call is performed. After the second step of measuring the output of the bandpass filter at a predetermined time interval to measure the level of the 440HZ and 480HZ signal, whether the level of the 440HZ and 480HZ signal is above the first predetermined level after performing the second step In the third step of determining, if the level of the 440HZ and 480HZ signal is not equal to or greater than the first predetermined level after performing the third step, the fourth step of entering the second step and the 440HZ and 480HZ signals after performing the third step If the level is equal to or greater than the first predetermined level, the fifth step of recognizing that the other party is called and implementing a voice call starting point extraction algorithm; A sixth step of determining whether the level of the 440HZ and the 480HZ signals is less than or equal to the second predetermined level after the sixth step of determining whether the level is less than the second predetermined level by measuring the levels of the 0HZ and the 480HZ signals. After the step 7 and the sixth step, if the level of the 440HZ and 480HZ signal is less than the second predetermined level, the absolute value of the signal input for the second predetermined time is measured and the average value is calculated to calculate the average value of the signal input for the second predetermined time. Eighth step of determining whether the absolute mean value is greater than or equal to the third level After the eighth step, if the absolute mean value of the signal input during the second predetermined time is not greater than or equal to the third level, the ninth step is entered; And a tenth step of recognizing the point of time as a voice call when the average value of the absolute value of the signal input for the second predetermined time after performing the eighth step is greater than or equal to a third predetermined level. Starting point detection method of the phone speaker phone. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019930001496A 1993-02-04 1993-02-04 How to Detect Initiation of Telephone Call on a Full Duplexer Speaker Phone KR940020743A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1019930001496A KR940020743A (en) 1993-02-04 1993-02-04 How to Detect Initiation of Telephone Call on a Full Duplexer Speaker Phone

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1019930001496A KR940020743A (en) 1993-02-04 1993-02-04 How to Detect Initiation of Telephone Call on a Full Duplexer Speaker Phone

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KR940020743A true KR940020743A (en) 1994-09-16

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