KR970004570A - Device and method for detecting duotone complex frequency signal - Google Patents
Device and method for detecting duotone complex frequency signal Download PDFInfo
- Publication number
- KR970004570A KR970004570A KR1019950016187A KR19950016187A KR970004570A KR 970004570 A KR970004570 A KR 970004570A KR 1019950016187 A KR1019950016187 A KR 1019950016187A KR 19950016187 A KR19950016187 A KR 19950016187A KR 970004570 A KR970004570 A KR 970004570A
- Authority
- KR
- South Korea
- Prior art keywords
- frequency signal
- complex frequency
- detecting
- dual tone
- dual
- Prior art date
Links
Abstract
1. 청구범위에 기재된 발명이 속한 기술분야1. TECHNICAL FIELD OF THE INVENTION
VMS(Voice Mailing System)에서 이중톤 복합주파수를 검출하는 장치 및 방법에 관한 것이다.An apparatus and method for detecting a dual tone complex frequency in a VMS (Voice Mailing System).
2. 발명이 해결하고자 하는 기술적 과제2. Technical problem to be solved by the invention
반향제거 알고리즘을 통해 이중톤 복합주파수를 검출할 때 송출메세지 또는 잡음으로 인한 오동작을 방지한다.The echo cancellation algorithm prevents malfunction due to transmission messages or noise when detecting duotone complex frequencies.
3. 발명의 해결방법의 요지3. Summary of Solution to Invention
반향제거 알고리즘을 통해 이중톤 복합주파수를 검출하기 위해 이중톤 복합 주파수인 경우 송출메세지의 레벨을 낮추거나 차단한다.In order to detect the dual tone complex frequency through the echo cancellation algorithm, the level of the outgoing message is lowered or blocked in the case of the dual tone complex frequency.
4. 발명의 중요한 용도4. Important uses of the invention
공중전화교환망에서 이중톤 복합주파수를 검출하는데 이용된다.It is used to detect duplex tone frequency in public switched telephone network.
Description
본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음Since this is an open matter, no full text was included.
제4도는 본 발명에 따른 DTMF 검출장치를 포함한 VMS의 블럭구성도, 제5도는 반향제거를 위한 적응필터의 구현이 불량하여 가입자의 DTMF 검출이 불량할 경우의 주파수에 대한 신호의 크기 관계도, 제6도는 반향제거제를 위한 적응필터의 구현이 양호하여 가입자의 DTMF 검출이 불량할 경우의 주파수영역에 대한 신호의 크기 관계도.4 is a block diagram of a VMS including a DTMF detection apparatus according to the present invention, and FIG. 5 is a diagram illustrating a relationship between a signal size and a frequency when a subscriber's DTMF detection is poor due to poor implementation of an adaptive filter for echo cancellation. 6 is a diagram illustrating the magnitude of the signal in the frequency domain when the adaptive filter for the echo canceller is implemented so that the DTMF detection of the subscriber is poor.
Claims (6)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1019950016187A KR970004570A (en) | 1995-06-17 | 1995-06-17 | Device and method for detecting duotone complex frequency signal |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1019950016187A KR970004570A (en) | 1995-06-17 | 1995-06-17 | Device and method for detecting duotone complex frequency signal |
Publications (1)
Publication Number | Publication Date |
---|---|
KR970004570A true KR970004570A (en) | 1997-01-29 |
Family
ID=66523903
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
KR1019950016187A KR970004570A (en) | 1995-06-17 | 1995-06-17 | Device and method for detecting duotone complex frequency signal |
Country Status (1)
Country | Link |
---|---|
KR (1) | KR970004570A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100463845B1 (en) * | 2000-03-07 | 2004-12-29 | 엘지전자 주식회사 | Method Of Dual Tone Multi Frequency Signaling Detecting In Switching System |
-
1995
- 1995-06-17 KR KR1019950016187A patent/KR970004570A/en not_active Application Discontinuation
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100463845B1 (en) * | 2000-03-07 | 2004-12-29 | 엘지전자 주식회사 | Method Of Dual Tone Multi Frequency Signaling Detecting In Switching System |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US5164989A (en) | Echo cancellation methods and apparatus for voice processing systems | |
US5638436A (en) | Voice detection | |
AU6314699A (en) | Digital signal processor-based telephone test set analysing and displaying multiple signal parameter data for terminal mode and line monitor mode operation | |
KR960704400A (en) | Echo cancellation device and learning method | |
US5459781A (en) | Selectively activated dual tone multi-frequency detector | |
US6269160B1 (en) | Communications device including an improved CPE alerting signal (CAS) detection system | |
CA2265115C (en) | Call related information receiver unit | |
EP1797648A1 (en) | Suppressing echo cancelling in packet switched network | |
US5943407A (en) | Performance enhancement of tone detection and FSK detection using hybrid echo cancellation | |
KR970004570A (en) | Device and method for detecting duotone complex frequency signal | |
WO1998028893A1 (en) | Method and apparatus for suppressing echo in telephony | |
JPH06284045A (en) | Method and equipment for performing automatic switching between transmission of spectrally redundant outgoing signal and reception of incoming signal | |
EP0759236B1 (en) | Band power echo reducer for multifrequency signal detectors | |
KR970031731A (en) | Modem / telephone / facsimile detection device and detection method | |
KR930011534A (en) | How to make phone call and receive fax by password | |
CN1206277A (en) | Digital signal processor-based telephone test set | |
JPH07303072A (en) | Method and device for detecting double talk | |
US6798880B1 (en) | System and method for suppressing in-band stimuli and telecommunications infrastructure incorporating the same | |
KR940006003B1 (en) | Permanent hook-off prevention method | |
CN100474870C (en) | Call side terminal apparatus style detecting method and calling control system | |
AU6999698A (en) | Digital signal processor-based telephone test set | |
KR900005748A (en) | Method and apparatus for calling with interphone through public telephone network in absence | |
JPH11177657A (en) | Method for echo cancellor to detect cas signal and telephone system device | |
KR960012865A (en) | Method of generating extension ring according to off hook frequency | |
KR960028018A (en) | Selective call method of telephone |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
WITN | Withdrawal due to no request for examination |