ES8404130A1 - Aparato para identificar senales digitales de frecuencias multiples. - Google Patents

Aparato para identificar senales digitales de frecuencias multiples.

Info

Publication number
ES8404130A1
ES8404130A1 ES521229A ES521229A ES8404130A1 ES 8404130 A1 ES8404130 A1 ES 8404130A1 ES 521229 A ES521229 A ES 521229A ES 521229 A ES521229 A ES 521229A ES 8404130 A1 ES8404130 A1 ES 8404130A1
Authority
ES
Spain
Prior art keywords
signal
receivers
selective
signals
circuit
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.)
Expired
Application number
ES521229A
Other languages
English (en)
Other versions
ES521229A0 (es
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.)
Telefonaktiebolaget LM Ericsson AB
Original Assignee
Telefonaktiebolaget LM Ericsson AB
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 Telefonaktiebolaget LM Ericsson AB filed Critical Telefonaktiebolaget LM Ericsson AB
Publication of ES8404130A1 publication Critical patent/ES8404130A1/es
Publication of ES521229A0 publication Critical patent/ES521229A0/es
Granted legal-status Critical Current

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
    • H04Q1/457—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling with conversion of multifrequency signals into digital signals

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)
  • Noise Elimination (AREA)

Abstract

APARATO PARA IDENTIFICAR SEÑALES DIGITALES DE FRECUENCIAS MULTIPLES.LA SEÑAL DE ENTRADA A LOS RECEPTORES (1...6) SE MULTIPLICA, EN CADA MOMENTO DE MUESTREO, POR SENDOS COEFICIENTES (8, 9). EL PRODUCTO DE LAS MULTIPLICACIONES ES ACUMULADO (12, 13) Y ELEVADO AL CUADRADO (14, 15), Y LOS RESULTADOS SE SUMAN (16) PARA OBTENER UNA MEDIDA DE LA ENERGIA DE SEÑAL DENTRO DE LA BANDA DE PESO. UNOS CIRCUITOS DE FILTRADO (17, 18, 28), SUMADORES (23), COMPARADORES (30), Y DE UMBRAL (29) DETERMINAN LAS SEÑALES QUE HAN DE INDICAR LA RECEPCION DE UNA SEÑAL DIGITAL DE MULTIFRECUENCIA.DEAPLICACION EN RECEPTORES DIGITALES DE MULTIFRECUENCIA.
ES521229A 1982-04-06 1983-04-05 Aparato para identificar senales digitales de frecuencias multiples. Granted ES521229A0 (es)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE8202191A SE430554B (sv) 1982-04-06 1982-04-06 Anordning for att identifiera digitala flerfrekvenssignaler

Publications (2)

Publication Number Publication Date
ES8404130A1 true ES8404130A1 (es) 1984-04-01
ES521229A0 ES521229A0 (es) 1984-04-01

Family

ID=20346473

Family Applications (1)

Application Number Title Priority Date Filing Date
ES521229A Granted ES521229A0 (es) 1982-04-06 1983-04-05 Aparato para identificar senales digitales de frecuencias multiples.

Country Status (9)

Country Link
US (1) US4614909A (es)
ES (1) ES521229A0 (es)
FI (1) FI841600A0 (es)
GB (1) GB2135488B (es)
IT (1) IT8320471A0 (es)
NL (1) NL8320091A (es)
NO (1) NO834469L (es)
SE (1) SE430554B (es)
WO (1) WO1983003732A1 (es)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3505950A1 (de) * 1985-02-21 1986-08-21 Deutsche Itt Industries Gmbh, 7800 Freiburg Integrierbare schaltungsanordnung zur identifizierung eines pilottones
NL8502008A (nl) * 1985-07-12 1987-02-02 Philips Nv Ontvanginrichting voor het onder bescherming van een stoorsignaal/spraaksignaalbewakingsfunctie herkennen van een aantal verschillende en voorafbepaalde frequentiecombinaties van toonfrequente signaleringscomponenten.
US4759748A (en) * 1986-06-30 1988-07-26 Raychem Corporation Guiding catheter
DE3629907A1 (de) * 1986-09-03 1988-03-10 Standard Elektrik Lorenz Ag Signalisierungsempfaenger
US4853958A (en) * 1988-06-02 1989-08-01 Northern Telecom Limited LPC-based DTMF receiver for secondary signalling
WO1990000841A1 (en) * 1988-07-15 1990-01-25 Luminis Pty. Ltd. Access protection and priority control in distributed queueing
DE4032369C1 (es) * 1990-10-12 1992-01-30 Telenorma Gmbh, 6000 Frankfurt, De
CA2116043C (en) * 1994-02-21 1997-09-23 Alexander F. Tulai Programmable digital call progress tone detector
US5793306A (en) * 1995-12-29 1998-08-11 Vershinin; Michael Identification systems employing frequency-based coded information
JPH09243679A (ja) * 1996-03-05 1997-09-19 Takayoshi Hirata 任意区間波形を用いた非調和的周波数分析法
US7317765B2 (en) * 2002-11-26 2008-01-08 The Johns Hopkins University Signal observation system

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3875347A (en) * 1973-10-01 1975-04-01 Gte Automatic Electric Lab Inc Multifrequency signal receiver
US3935539A (en) * 1974-04-08 1976-01-27 The United States Of America As Represented By The Secretary Of The Navy A-C signal multiplying circuit by a ratio of whole numbers the numerator of which is greater than one and greater than the denominator
US4142177A (en) * 1976-08-12 1979-02-27 Motorola, Inc. Digital tone decoder system
US4145660A (en) * 1977-12-23 1979-03-20 Rca Corporation Frequency activated circuit
US4230991A (en) * 1978-09-11 1980-10-28 Alexandre Paphitis Digital frequency process and method using frequency shifting techniques, especially for low frequency measurements
JPS5830793B2 (ja) * 1978-10-04 1983-07-01 株式会社日立製作所 多周波信号受信方式
US4334273A (en) * 1979-04-24 1982-06-08 Kokusai Denshin Denwa Co., Ltd. Signal processing system using a digital technique
NL177552C (nl) * 1979-05-02 1985-10-01 Nederlanden Staat Inrichting voor het onder gebruikmaking van een digitale correlatiemethode vaststellen van de aanwezigheid van elke van een aantal vaste frequenties in een signaal.
CA1137565A (en) * 1979-05-22 1982-12-14 Masaharu Kawaguchi Digital multi-frequency receiver
US4368434A (en) * 1980-09-18 1983-01-11 Codex Corporation Programmable digital detector for the demodulation of angle modulated electrical signals
US4399536A (en) * 1981-10-02 1983-08-16 Bell Telephone Laboratories, Incorporated Convolution filter arrangement for digital multifrequency receiver

Also Published As

Publication number Publication date
SE430554B (sv) 1983-11-21
SE8202191L (sv) 1983-10-07
GB2135488B (en) 1985-08-07
NL8320091A (nl) 1984-07-02
NO834469L (no) 1983-12-05
GB2135488A (en) 1984-08-30
GB8409831D0 (en) 1984-05-23
IT8320471A0 (it) 1983-04-06
WO1983003732A1 (en) 1983-10-27
US4614909A (en) 1986-09-30
ES521229A0 (es) 1984-04-01
FI841600A (fi) 1984-04-24
FI841600A0 (fi) 1984-04-24

Similar Documents

Publication Publication Date Title
ES8404130A1 (es) Aparato para identificar senales digitales de frecuencias multiples.
JPS5776910A (en) Ghost rejecting device
JPS56166620A (en) Automatic equalizer
GB1477667A (en) Circuit arrangement for producing a pulse sequence corresponding to the foetal cardiac pulses
IE42621L (en) Digital receiver
JPS559140A (en) Acoustic emission discriminator
SU1469559A1 (ru) Способ обнаружени речевых сигналов на фоне шумов
SU777848A1 (ru) Способ и устройство адаптивного приема сигналов двухканальной частотной телеграфии
RU2055444C1 (ru) Многоканальное устройство для приема дискретных частотных сигналов
PT77303A (en) Apparatus for identifying digital multi-frequency signals
SU790358A1 (ru) Устройство дл приема дискретной информации
JPS61200796A (ja) チヤネル周波数検出方式
SU985968A1 (ru) Устройство дл приема дискретных частотно-манипулированных сигналов
SU930702A1 (ru) Устройство измерени отношени сигнал/помеха
JPS5772451A (en) Frequency detection system
JPS5687827A (en) Spectral analyzer
JPS54157018A (en) Fm receiver
JPS56125680A (en) Decision method for terrestrial vibration
JPS56140716A (en) Elastic surface wave filter
JPS56110347A (en) Am receiver
JPS57143965A (en) Multifrequency signal receiver
JPS56168408A (en) Reducing device for distortion of nonlinear signal
JPS574626A (en) Stereophonic demodulating circuit
JPS56165441A (en) Stereo demodulator
JPS5735402A (en) Frequency discriminating device

Legal Events

Date Code Title Description
FD1A Patent lapsed

Effective date: 19971001