RU96122476A - TWO-TONE MULTI-FREQUENCY DETECTOR AND METHOD FOR DETECTING A TWO-TONE MULTIFREQUENCY SIGNAL - Google Patents
TWO-TONE MULTI-FREQUENCY DETECTOR AND METHOD FOR DETECTING A TWO-TONE MULTIFREQUENCY SIGNALInfo
- Publication number
- RU96122476A RU96122476A RU96122476/09A RU96122476A RU96122476A RU 96122476 A RU96122476 A RU 96122476A RU 96122476/09 A RU96122476/09 A RU 96122476/09A RU 96122476 A RU96122476 A RU 96122476A RU 96122476 A RU96122476 A RU 96122476A
- Authority
- RU
- Russia
- Prior art keywords
- frequency band
- power
- frequency
- tone multi
- value
- Prior art date
Links
- 230000000051 modifying Effects 0.000 claims 1
Claims (6)
где r(t) = sin(ω2t+θ), r(t) - входной сигнал, q2 - выходной сигнал, ω1 - эталонная частота, которая детектируется в каждом корреляторе ω2 - частота входного сигнала r(t), а θ - фаза входного сигнала r(t).2. The dual-tone multi-frequency detector according to claim 1, characterized in that each correlator from the correlation block is configured to determine power at each frequency by using the following equation:
where r (t) = sin (ω 2 t + θ), r (t) is the input signal, q 2 is the output signal, ω 1 is the reference frequency that is detected in each correlator, ω 2 is the frequency of the input signal r (t) , and θ is the phase of the input signal r (t).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR42260/1995 | 1995-11-20 | ||
KR1019950042260A KR0149759B1 (en) | 1995-11-20 | 1995-11-20 | Dtmf detector using dsp chip |
Publications (2)
Publication Number | Publication Date |
---|---|
RU2117404C1 RU2117404C1 (en) | 1998-08-10 |
RU96122476A true RU96122476A (en) | 1998-12-10 |
Family
ID=19434699
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
RU96122476A RU2117404C1 (en) | 1995-11-20 | 1996-11-19 | Two-tone multiple-frequency detector and method for detection of two-tone signal of multiple frequency |
Country Status (4)
Country | Link |
---|---|
US (1) | US5937059A (en) |
KR (1) | KR0149759B1 (en) |
CN (1) | CN1090864C (en) |
RU (1) | RU2117404C1 (en) |
Families Citing this family (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6370244B1 (en) * | 1998-04-03 | 2002-04-09 | Board Of Regents Of The University Of Texas System | Efficient digital ITU-compliant zero-buffering DTMF detection using the non-uniform discrete fourier transform |
US6269160B1 (en) * | 1998-04-20 | 2001-07-31 | Advanced Micro Devices, Inc. | Communications device including an improved CPE alerting signal (CAS) detection system |
KR100283388B1 (en) * | 1998-05-15 | 2001-03-02 | 서평원 | Subscriber signal recognition method in exchange |
US6046977A (en) * | 1998-09-23 | 2000-04-04 | Advanced Microdevices, Inc. | Method and apparatus for detecting signal misalignment |
US6580792B1 (en) * | 1999-01-05 | 2003-06-17 | Legerity, Inc. | Signal detector with automatic gain control |
US7190748B2 (en) | 2001-08-17 | 2007-03-13 | Dsp Group Inc. | Digital front-end for wireless communication system |
CN100456759C (en) * | 2003-08-11 | 2009-01-28 | 华为技术有限公司 | Method for realizing dual-tone multifrequency signal silence |
JP4862262B2 (en) * | 2005-02-14 | 2012-01-25 | 日本電気株式会社 | DTMF signal processing method, processing device, relay device, and communication terminal device |
CN101046955A (en) * | 2006-04-24 | 2007-10-03 | 华为技术有限公司 | PCM code flow voice detection method |
CA2726241C (en) * | 2008-06-25 | 2016-11-29 | Neoprobe Corporation | Surgical probe apparatus and system |
DE102010051432A1 (en) * | 2010-11-15 | 2012-05-31 | Rohde & Schwarz Gmbh & Co Kg | Thermally stabilized power sensor |
US9117440B2 (en) | 2011-05-19 | 2015-08-25 | Dolby International Ab | Method, apparatus, and medium for detecting frequency extension coding in the coding history of an audio signal |
WO2014151929A1 (en) | 2013-03-15 | 2014-09-25 | Proteus Digital Health, Inc. | Personal authentication apparatus system and method |
JP2015005137A (en) * | 2013-06-20 | 2015-01-08 | 株式会社東芝 | Server, electronic apparatus, control method of electronic apparatus and control program of electronic apparatus |
EP3047618B1 (en) * | 2013-09-20 | 2023-11-08 | Otsuka Pharmaceutical Co., Ltd. | Methods, devices and systems for receiving and decoding a signal in the presence of noise using slices and warping |
Family Cites Families (20)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4484035A (en) * | 1980-09-29 | 1984-11-20 | Transwave | Dual tone multi frequency digital detector |
US4550425A (en) * | 1982-09-20 | 1985-10-29 | Sperry Corporation | Speech sampling and companding device |
CA1216380A (en) * | 1984-11-09 | 1987-01-06 | Gordon J. Reesor | Digital tone detector |
US4689760A (en) * | 1984-11-09 | 1987-08-25 | Digital Sound Corporation | Digital tone decoder and method of decoding tones using linear prediction coding |
CA1289281C (en) * | 1988-05-05 | 1991-09-17 | Jerry Stroobach | Digital dtmf tone detector |
US4853958A (en) * | 1988-06-02 | 1989-08-01 | Northern Telecom Limited | LPC-based DTMF receiver for secondary signalling |
US4833399A (en) * | 1988-06-13 | 1989-05-23 | Texas Instruments Incorporated | DTMF receiver |
JPH03132291A (en) * | 1989-10-18 | 1991-06-05 | Fujitsu Ltd | Pb signal detection system |
US5172406A (en) * | 1990-08-31 | 1992-12-15 | Rolm Systems | Dtmf signal detection apparatus |
US5163050A (en) * | 1991-01-23 | 1992-11-10 | Digital Sound Corporation | Configurable parameter dtmf detector |
EP0548438A1 (en) * | 1991-12-20 | 1993-06-30 | International Business Machines Corporation | A method for detecting dual tone multi-frequency signals and device for implementing said method |
JP2851974B2 (en) * | 1992-08-07 | 1999-01-27 | シャープ株式会社 | DTMF signal judgment circuit |
US5459784A (en) * | 1992-09-28 | 1995-10-17 | Comsat Corporation | Dual-tone multifrequency (DTMF) signalling transparency for low-data-rate vocoders |
US5333191A (en) * | 1993-04-22 | 1994-07-26 | Interdigital Technology Corporation | Detection of multifrequency tone signals |
US5408529A (en) * | 1993-06-02 | 1995-04-18 | Motorola, Inc. | Dual tone detector operable in the presence of speech or background noise and method therefor |
US5459781A (en) * | 1994-01-12 | 1995-10-17 | Dialogic Corporation | Selectively activated dual tone multi-frequency detector |
US5535271A (en) * | 1994-05-27 | 1996-07-09 | Hughes Electronics | Apparatus and method for dual tone multifrequency signal detection |
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 |
US5588053A (en) * | 1995-11-29 | 1996-12-24 | Advanced Micro Devices | DTMF detector system and method which performs static and dynamic thresholding |
-
1995
- 1995-11-20 KR KR1019950042260A patent/KR0149759B1/en not_active IP Right Cessation
-
1996
- 1996-11-19 RU RU96122476A patent/RU2117404C1/en not_active IP Right Cessation
- 1996-11-19 US US08/752,426 patent/US5937059A/en not_active Expired - Lifetime
- 1996-11-20 CN CN96121098.2A patent/CN1090864C/en not_active Expired - Fee Related
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