FR2481542B1 - - Google Patents
Info
- Publication number
- FR2481542B1 FR2481542B1 FR8107177A FR8107177A FR2481542B1 FR 2481542 B1 FR2481542 B1 FR 2481542B1 FR 8107177 A FR8107177 A FR 8107177A FR 8107177 A FR8107177 A FR 8107177A FR 2481542 B1 FR2481542 B1 FR 2481542B1
- Authority
- FR
- France
- 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
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
- H04Q1/4575—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 which are transmitted in digital form
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Circuits Of Receivers In General (AREA)
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
- Transmission Systems Not Characterized By The Medium Used For Transmission (AREA)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5389380A JPS56149889A (en) | 1980-04-23 | 1980-04-23 | Push-botton telephone signal receiving system |
| JP5741680A JPS56153897A (en) | 1980-04-30 | 1980-04-30 | Receiving device for push-button telephone signal |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| FR2481542A1 FR2481542A1 (fr) | 1981-10-30 |
| FR2481542B1 true FR2481542B1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) | 1984-05-18 |
Family
ID=26394617
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| FR8107177A Granted FR2481542A1 (fr) | 1980-04-23 | 1981-04-09 | Recepteur de signalisation numerique a bouton-poussoir |
Country Status (3)
Families Citing this family (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4626629A (en) * | 1984-12-14 | 1986-12-02 | Gte Communication Systems Corporation | Digital multifrequency signal receiver |
| SE9202065L (sv) * | 1992-07-03 | 1994-01-04 | Ericsson Telefon Ab L M | Sätt att förbättra mottagarens känslighet och talimmuniteten vid DTMF-mottagning |
| JP2851974B2 (ja) * | 1992-08-07 | 1999-01-27 | シャープ株式会社 | Ｄｔｍｆ信号判定回路 |
| JP2908168B2 (ja) * | 1993-03-15 | 1999-06-21 | シャープ株式会社 | 信号識別回路 |
| WO1996025825A1 (en) * | 1995-02-13 | 1996-08-22 | Cidco, Incorporated | Method and structure for detecting a customer premises equipment alerting signal |
| US5619564A (en) * | 1995-05-31 | 1997-04-08 | Lucent Technologies Inc. | Tone detector with improved performance in the presence of speech |
| KR0149759B1 (ko) * | 1995-11-20 | 1998-11-02 | 김광호 | 디지탈신호 처리칩을 이용한 디티엠프 검출기 및 구현방법 |
| JPH11502999A (ja) * | 1996-01-26 | 1999-03-09 | フィリップス エレクトロニクス ネムローゼ フェンノートシャップ | トーン検出を改善した伝送システム |
| RU2128401C1 (ru) * | 1997-02-28 | 1999-03-27 | Войсковая часть 35533 | Устройство для приема многочастотных сигналов |
| RU2128400C1 (ru) * | 1997-02-28 | 1999-03-27 | Войсковая часть 35533 | Устройство для приема многочастотных сигналов |
| US5995557A (en) * | 1997-06-12 | 1999-11-30 | Nortel Networks Corporation | Tone detection with aliasing bandpass filters |
| RU2178950C2 (ru) * | 2000-01-20 | 2002-01-27 | в/ч 35533 | Устройство для приема сигналов тонального набора |
| RU2174739C1 (ru) * | 2000-01-20 | 2001-10-10 | Войсковая часть 35533 | Устройство для декодирования двухчастотных сигналов |
| RU2169436C1 (ru) * | 2000-01-20 | 2001-06-20 | Войсковая часть 35533 | Устройство для приема многочастотных сигналов |
| RU2171549C1 (ru) * | 2000-01-26 | 2001-07-27 | Войсковая часть 35533 | Устройство для выделения акустических сигналов в каналах связи |
| RU2214051C2 (ru) * | 2001-01-22 | 2003-10-10 | Войсковая часть 35533 | Устройство для выделения тональных сигналов в каналах связи |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE397763B (sv) * | 1976-03-09 | 1977-11-14 | Ericsson Telefon Ab L M | Mottagaranordning for storningskenslig detektering av atminstone tva tonfrekvenser i en inkommande tonsignal |
| JPS6017279B2 (ja) * | 1978-12-06 | 1985-05-01 | 株式会社日立製作所 | 多周波信号受信装置 |
-
1981
- 1981-04-07 US US06/251,829 patent/US4395595A/en not_active Expired - Lifetime
- 1981-04-09 FR FR8107177A patent/FR2481542A1/fr active Granted
- 1981-04-22 CA CA000375974A patent/CA1155985A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| CA1155985A (en) | 1983-10-25 |
| FR2481542A1 (fr) | 1981-10-30 |
| US4395595A (en) | 1983-07-26 |
Similar Documents
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| ST | Notification of lapse |