TW325627B - Transmission system with improved tone detection - Google Patents
Transmission system with improved tone detectionInfo
- Publication number
- TW325627B TW325627B TW086101502A TW86101502A TW325627B TW 325627 B TW325627 B TW 325627B TW 086101502 A TW086101502 A TW 086101502A TW 86101502 A TW86101502 A TW 86101502A TW 325627 B TW325627 B TW 325627B
- Authority
- TW
- Taiwan
- Prior art keywords
- transmission system
- tone detection
- tone signals
- improved tone
- intensity measurement
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q1/00—Details of selecting apparatus or arrangements
- H04Q1/18—Electrical details
- H04Q1/30—Signalling arrangements; Manipulation of signalling currents
- H04Q1/44—Signalling arrangements; Manipulation of signalling currents using alternate current
- H04Q1/444—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies
- H04Q1/45—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q1/00—Details of selecting apparatus or arrangements
- H04Q1/18—Electrical details
- H04Q1/30—Signalling arrangements; Manipulation of signalling currents
- H04Q1/44—Signalling arrangements; Manipulation of signalling currents using alternate current
- H04Q1/444—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies
- H04Q1/45—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling
- H04Q1/453—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling in which m-out-of-n signalling frequencies are transmitted
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
- Monitoring And Testing Of Transmission In General (AREA)
- Mobile Radio Communication Systems (AREA)
- Transmitters (AREA)
- Small-Scale Networks (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP96200176 | 1996-01-26 |
Publications (1)
Publication Number | Publication Date |
---|---|
TW325627B true TW325627B (en) | 1998-01-21 |
Family
ID=8223612
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
TW086101502A TW325627B (en) | 1996-01-26 | 1997-02-12 | Transmission system with improved tone detection |
Country Status (7)
Country | Link |
---|---|
US (1) | US5982874A (zh) |
EP (1) | EP0818113A1 (zh) |
JP (1) | JPH11502999A (zh) |
KR (1) | KR100430513B1 (zh) |
CN (1) | CN1101634C (zh) |
TW (1) | TW325627B (zh) |
WO (1) | WO1997027709A1 (zh) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6603818B1 (en) | 1999-09-23 | 2003-08-05 | Lockheed Martin Energy Research Corporation | Pulse transmission transceiver architecture for low power communications |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CA984068A (en) * | 1972-08-10 | 1976-02-17 | Alexander D. Proudfoot | Method and apparatus for detecting the presence of signal components of predetermined frequency in a multi-frequency signal |
JPS5242308A (en) * | 1975-10-01 | 1977-04-01 | Iwatsu Electric Co Ltd | Multiplex frequency signal receiver |
US4395595A (en) * | 1980-04-23 | 1983-07-26 | Nippon Electric Co., Ltd. | Digital pushbutton signalling receiver |
CA1268570A (en) * | 1987-08-14 | 1990-05-01 | Melvin J. Roberts | Telephone tone detector |
CA1289281C (en) * | 1988-05-05 | 1991-09-17 | Jerry Stroobach | Digital dtmf tone detector |
JPH03132291A (ja) * | 1989-10-18 | 1991-06-05 | Fujitsu Ltd | Pb信号検出方式 |
FR2720577B1 (fr) * | 1994-05-27 | 1996-08-14 | Sgs Thomson Microelectronics | Circuit de détection de tonalité téléphonique. |
US5649002A (en) * | 1994-12-13 | 1997-07-15 | Colonial Data Technologies Corp. | Method and apparatus for detecting a telephone CPE alerting signal |
US5619564A (en) * | 1995-05-31 | 1997-04-08 | Lucent Technologies Inc. | Tone detector with improved performance in the presence of speech |
US5644634A (en) * | 1995-11-29 | 1997-07-01 | Advanced Micro Devices | System and method for dual tone multifrequency detection using variable frame widths |
-
1997
- 1997-01-17 JP JP9526694A patent/JPH11502999A/ja not_active Abandoned
- 1997-01-17 CN CN97190195A patent/CN1101634C/zh not_active Expired - Fee Related
- 1997-01-17 WO PCT/IB1997/000034 patent/WO1997027709A1/en not_active Application Discontinuation
- 1997-01-17 KR KR1019970706722A patent/KR100430513B1/ko not_active IP Right Cessation
- 1997-01-17 EP EP97900083A patent/EP0818113A1/en not_active Withdrawn
- 1997-01-23 US US08/788,721 patent/US5982874A/en not_active Expired - Fee Related
- 1997-02-12 TW TW086101502A patent/TW325627B/zh active
Also Published As
Publication number | Publication date |
---|---|
CN1181861A (zh) | 1998-05-13 |
WO1997027709A1 (en) | 1997-07-31 |
KR100430513B1 (ko) | 2004-10-14 |
EP0818113A1 (en) | 1998-01-14 |
US5982874A (en) | 1999-11-09 |
KR19980703318A (ko) | 1998-10-15 |
JPH11502999A (ja) | 1999-03-09 |
CN1101634C (zh) | 2003-02-12 |
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