SE7415376L - - Google Patents
Info
- Publication number
- SE7415376L SE7415376L SE7415376A SE7415376A SE7415376L SE 7415376 L SE7415376 L SE 7415376L SE 7415376 A SE7415376 A SE 7415376A SE 7415376 A SE7415376 A SE 7415376A SE 7415376 L SE7415376 L SE 7415376L
- Authority
- SE
- Sweden
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)
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
- Television Receiver Circuits (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NL7316990A NL7316990A (nl) | 1973-12-12 | 1973-12-12 | Mfc-ontvanger voor digitale signaalverwerking. |
Publications (1)
Publication Number | Publication Date |
---|---|
SE7415376L true SE7415376L (ja) | 1975-06-13 |
Family
ID=19820176
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
SE7415376A SE7415376L (ja) | 1973-12-12 | 1974-12-09 |
Country Status (9)
Country | Link |
---|---|
US (1) | US3976843A (ja) |
JP (1) | JPS5094806A (ja) |
BE (1) | BE823184A (ja) |
CA (1) | CA1053389A (ja) |
DE (1) | DE2457471A1 (ja) |
FR (1) | FR2254922A1 (ja) |
GB (1) | GB1487627A (ja) |
NL (1) | NL7316990A (ja) |
SE (1) | SE7415376L (ja) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4185172A (en) * | 1976-12-17 | 1980-01-22 | Cselt - Centro Studi E Laboratori Telecomunicazioni S.P.A. | Method of and means for detecting digitized multi frequency-coded signals |
IT1072242B (it) * | 1976-12-17 | 1985-04-10 | Cselt Centro Studi Lab Telecom | Procedimento e dispositivo per il riconoscimento di segnali telefonici in codice multifrequenza convertiti in forma numerica |
US4245325A (en) * | 1978-02-24 | 1981-01-13 | Nippon Telegraph And Telephone Public Corporation | Digital multifrequency signalling receiver |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3151219A (en) * | 1959-07-28 | 1964-09-29 | Gen Dynamics Corp | Tone detecting circuitry |
US3223783A (en) * | 1960-05-09 | 1965-12-14 | Fuji Tsushinki Seizo Kk | Time-division multiplex voice-frequency discriminator |
US3066193A (en) * | 1961-04-07 | 1962-11-27 | Gen Dynamics Corp | Tone selection circuit |
US3710028A (en) * | 1970-11-10 | 1973-01-09 | Gte Automatic Electric Lab Inc | Detector for digitally transmitted multifrequency tones as utilized for signaling in a pulse code modulated telephone system |
NL7110444A (ja) * | 1971-07-29 | 1973-01-31 | Philips Nv | |
US3863030A (en) * | 1972-06-01 | 1975-01-28 | Gte Automatic Electric Lab Inc | Pcm tone receiver using digital spectrum analysis |
-
1973
- 1973-12-12 NL NL7316990A patent/NL7316990A/xx not_active Application Discontinuation
-
1974
- 1974-12-04 US US05/529,289 patent/US3976843A/en not_active Expired - Lifetime
- 1974-12-05 DE DE19742457471 patent/DE2457471A1/de active Pending
- 1974-12-09 GB GB53123/74A patent/GB1487627A/en not_active Expired
- 1974-12-09 CA CA215,532A patent/CA1053389A/en not_active Expired
- 1974-12-09 SE SE7415376A patent/SE7415376L/xx unknown
- 1974-12-10 BE BE151360A patent/BE823184A/xx unknown
- 1974-12-10 FR FR7440444A patent/FR2254922A1/fr not_active Withdrawn
- 1974-12-12 JP JP49142080A patent/JPS5094806A/ja active Pending
Also Published As
Publication number | Publication date |
---|---|
JPS5094806A (ja) | 1975-07-28 |
FR2254922A1 (ja) | 1975-07-11 |
DE2457471A1 (de) | 1975-06-19 |
CA1053389A (en) | 1979-04-24 |
NL7316990A (nl) | 1975-06-16 |
BE823184A (fr) | 1975-06-10 |
US3976843A (en) | 1976-08-24 |
GB1487627A (en) | 1977-10-05 |