IT1073417B - Sistema di codificazione di segnali acustici per reti di telecomunicazioni sistemi di trasferimento di dati e simili - Google Patents
Sistema di codificazione di segnali acustici per reti di telecomunicazioni sistemi di trasferimento di dati e similiInfo
- Publication number
- IT1073417B IT1073417B IT7651475A IT5147576A IT1073417B IT 1073417 B IT1073417 B IT 1073417B IT 7651475 A IT7651475 A IT 7651475A IT 5147576 A IT5147576 A IT 5147576A IT 1073417 B IT1073417 B IT 1073417B
- Authority
- IT
- Italy
- Prior art keywords
- similar
- data transfer
- acoustic signals
- code system
- transfer systems
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/26—Devices for calling a subscriber
- H04M1/30—Devices which can set up and transmit only one digit at a time
- H04M1/50—Devices which can set up and transmit only one digit at a time by generating or selecting currents of predetermined frequencies or combinations of frequencies
- H04M1/505—Devices which can set up and transmit only one digit at a time by generating or selecting currents of predetermined frequencies or combinations of frequencies signals generated in digital form
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
- Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
- Input From Keyboards Or The Like (AREA)
- Liquid Crystal Display Device Control (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US05/617,955 US4061886A (en) | 1975-09-29 | 1975-09-29 | Dual tone multiple frequency generator |
Publications (1)
Publication Number | Publication Date |
---|---|
IT1073417B true IT1073417B (it) | 1985-04-17 |
Family
ID=24475745
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
IT7651475A IT1073417B (it) | 1975-09-29 | 1976-09-28 | Sistema di codificazione di segnali acustici per reti di telecomunicazioni sistemi di trasferimento di dati e simili |
Country Status (9)
Country | Link |
---|---|
US (1) | US4061886A (it) |
JP (6) | JPS52144904A (it) |
BE (1) | BE846705A (it) |
BR (1) | BR7602945A (it) |
DE (1) | DE2643359C2 (it) |
GB (3) | GB1539410A (it) |
HK (2) | HK56584A (it) |
IT (1) | IT1073417B (it) |
NL (1) | NL178046C (it) |
Families Citing this family (21)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2808256C2 (de) * | 1978-02-25 | 1984-05-30 | Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt | Schaltungsanordnung zur Kompensation von Oberwellen |
US4196318A (en) * | 1978-09-29 | 1980-04-01 | Bell Telephone Laboratories, Incorporated | Electronically-switched multifrequency generator for providing tone signaling |
JPS5643849A (en) * | 1979-09-17 | 1981-04-22 | Taiko Denki Seisakusho:Kk | Check code transmission system of data transmission using push-button dial signal |
US4352958A (en) * | 1979-12-13 | 1982-10-05 | Bell Telephone Laboratories, Incorporated | Electronically-switched multifrequency generator with transducer control |
DE2952380C2 (de) * | 1979-12-24 | 1984-02-09 | Hagenuk GmbH, 2300 Kiel | Schaltungsanordnung zur Datenübertragung auf Fernsprechleitungen |
EP0055259A1 (en) * | 1980-06-30 | 1982-07-07 | Mostek Corporation | Tone generator circuit |
US4406926A (en) * | 1980-12-19 | 1983-09-27 | International Telephone And Telegraph Corporation | Telephone station circuit using digital tone generation |
US4472601A (en) * | 1982-07-14 | 1984-09-18 | Rca Corporation | Control circuit for telephone receiver and transmitter |
JPS5981957A (ja) * | 1982-11-02 | 1984-05-11 | Nippon Telegr & Teleph Corp <Ntt> | デイジタル式電話端末装置用2周波信号発振器 |
US4471170A (en) * | 1983-02-24 | 1984-09-11 | Motorola, Inc. | Non-integer programmable counter |
NL8303701A (nl) * | 1983-10-27 | 1985-05-17 | Philips Nv | Dtmf-telefoontoestel met meervoudig gebruik van de logica van de digitale toongenerator. |
JPS60136461A (ja) * | 1983-12-26 | 1985-07-19 | Toshiba Corp | Dtmf信号発生装置 |
US4563548A (en) * | 1984-04-10 | 1986-01-07 | Advanced Micro Devices, Inc. | Method and circuit for telephone dialing signal generation |
US4718057A (en) | 1985-08-30 | 1988-01-05 | Advanced Micro Devices, Inc. | Streamlined digital signal processor |
US5311580A (en) * | 1988-07-18 | 1994-05-10 | Canon Kabushiki Kaisha | Communication apparatus for providing a modulated analog wave |
NL8901018A (nl) * | 1989-04-24 | 1990-11-16 | Philips Nv | Electronisch telefoontoestel. |
JP2860962B2 (ja) * | 1990-05-28 | 1999-02-24 | ローム 株式会社 | 電話装置のdtmf信号送出回路 |
US6677513B1 (en) | 1998-05-29 | 2004-01-13 | International Business Machines Corporation | System and method for generating and attenuating digital tones |
US20100261435A1 (en) * | 2009-04-09 | 2010-10-14 | Broadcom Corporation | Multiple frequency band information signal frequency band compression |
US10847211B2 (en) * | 2018-04-18 | 2020-11-24 | Arm Limited | Latch circuitry for memory applications |
TWI835565B (zh) * | 2023-02-17 | 2024-03-11 | 瑞昱半導體股份有限公司 | 可提升預失真效果的收發機系統以及其控制方法 |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1496141A (fr) * | 1966-06-03 | 1967-09-29 | Cit Alcatel | Générateur d'ondes modulées en fréquence |
US3525819A (en) * | 1968-04-09 | 1970-08-25 | Bell Telephone Labor Inc | Electronic common switch for a telephone set |
US3772681A (en) * | 1970-10-14 | 1973-11-13 | Post Office | Frequency synthesiser |
US3778556A (en) * | 1971-07-02 | 1973-12-11 | Telecommunications Techn Inc | Telephone signaling and testing apparatus with provisions for either pulse or multifrequency dialing |
GB1378818A (en) * | 1971-08-27 | 1974-12-27 | Rockwell International Corp | Digital tone signal generator |
US3787836A (en) * | 1972-06-15 | 1974-01-22 | Bell Telephone Labor Inc | Multitone telephone dialing circuit employing digital-to-analog tone synthesis |
FR2208584A5 (it) * | 1972-11-29 | 1974-06-21 | Ibm France | |
US3941942A (en) * | 1974-01-02 | 1976-03-02 | Motorola, Inc. | Two of eight tone encoder |
-
1975
- 1975-09-29 US US05/617,955 patent/US4061886A/en not_active Expired - Lifetime
-
1976
- 1976-05-11 BR BR7602945A patent/BR7602945A/pt unknown
- 1976-09-22 GB GB29840/78A patent/GB1539410A/en not_active Expired
- 1976-09-22 GB GB29839/78A patent/GB1539409A/en not_active Expired
- 1976-09-22 GB GB39310/76A patent/GB1539408A/en not_active Expired
- 1976-09-25 DE DE2643359A patent/DE2643359C2/de not_active Expired
- 1976-09-28 NL NLAANVRAGE7610744,A patent/NL178046C/xx not_active IP Right Cessation
- 1976-09-28 IT IT7651475A patent/IT1073417B/it active
- 1976-09-29 JP JP11704276A patent/JPS52144904A/ja active Pending
- 1976-09-29 BE BE171041A patent/BE846705A/xx unknown
-
1979
- 1979-07-27 JP JP9509079A patent/JPS5558651A/ja active Pending
- 1979-07-27 JP JP9509179A patent/JPS5555650A/ja active Pending
-
1980
- 1980-08-19 JP JP1980117404U patent/JPS5934204Y2/ja not_active Expired
-
1983
- 1983-11-01 JP JP1983169982U patent/JPS5984948U/ja active Granted
- 1983-11-01 JP JP1983169983U patent/JPS5984949U/ja active Granted
-
1984
- 1984-07-19 HK HK565/84A patent/HK56584A/xx unknown
- 1984-07-19 HK HK566/84A patent/HK56684A/xx unknown
Also Published As
Publication number | Publication date |
---|---|
JPS5934204Y2 (ja) | 1984-09-21 |
BE846705A (fr) | 1977-01-17 |
GB1539410A (en) | 1979-01-31 |
HK56584A (en) | 1984-07-27 |
JPS626757Y2 (it) | 1987-02-17 |
GB1539408A (en) | 1979-01-31 |
NL7610744A (nl) | 1977-03-31 |
NL178046B (nl) | 1985-08-01 |
JPS56114151U (it) | 1981-09-02 |
JPS5984949U (ja) | 1984-06-08 |
JPS6329325Y2 (it) | 1988-08-08 |
US4061886A (en) | 1977-12-06 |
GB1539409A (en) | 1979-01-31 |
JPS5555650A (en) | 1980-04-23 |
HK56684A (en) | 1984-07-27 |
NL178046C (nl) | 1986-01-02 |
JPS52144904A (en) | 1977-12-02 |
BR7602945A (pt) | 1977-06-07 |
DE2643359C2 (de) | 1985-08-22 |
JPS5984948U (ja) | 1984-06-08 |
DE2643359A1 (de) | 1977-04-07 |
JPS5558651A (en) | 1980-05-01 |
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