BR7104902D0 - Aperfeicoamentos em receptores de frequencia multipla - Google Patents
Aperfeicoamentos em receptores de frequencia multiplaInfo
- Publication number
- BR7104902D0 BR7104902D0 BR4902/71A BR490271A BR7104902D0 BR 7104902 D0 BR7104902 D0 BR 7104902D0 BR 4902/71 A BR4902/71 A BR 4902/71A BR 490271 A BR490271 A BR 490271A BR 7104902 D0 BR7104902 D0 BR 7104902D0
- Authority
- BR
- Brazil
- Prior art keywords
- multiple frequency
- receptors
- frequency receptors
- frequency
- Prior art date
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
- H04Q1/453—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling in which m-out-of-n signalling frequencies are transmitted
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
- Interface Circuits In Exchanges (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB3716170 | 1970-07-31 |
Publications (1)
Publication Number | Publication Date |
---|---|
BR7104902D0 true BR7104902D0 (pt) | 1973-04-12 |
Family
ID=10394252
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
BR4902/71A BR7104902D0 (pt) | 1970-07-31 | 1971-07-30 | Aperfeicoamentos em receptores de frequencia multipla |
Country Status (5)
Country | Link |
---|---|
AU (1) | AU450736B2 (pt) |
BR (1) | BR7104902D0 (pt) |
CA (1) | CA941026A (pt) |
GB (1) | GB1342904A (pt) |
ZA (1) | ZA714899B (pt) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
SE396684B (sv) * | 1976-02-09 | 1977-09-26 | Ericsson Telefon Ab L M | Hallkrets i en mottagaranordning for mfc-signalering |
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 |
JPS57171870A (en) * | 1981-04-16 | 1982-10-22 | Fujitsu Ltd | Signal deciding circuit for digital multifrequency signal receiver |
GB2305318A (en) * | 1995-09-13 | 1997-04-02 | Thomson Multimedia Sa | Schmitt trigger for DTMF receiver |
-
1970
- 1970-07-31 GB GB3716170A patent/GB1342904A/en not_active Expired
-
1971
- 1971-07-22 ZA ZA714899A patent/ZA714899B/xx unknown
- 1971-07-27 CA CA119,233A patent/CA941026A/en not_active Expired
- 1971-07-30 AU AU31873/71A patent/AU450736B2/en not_active Expired
- 1971-07-30 BR BR4902/71A patent/BR7104902D0/pt unknown
Also Published As
Publication number | Publication date |
---|---|
GB1342904A (en) | 1974-01-10 |
ZA714899B (en) | 1972-04-26 |
CA941026A (en) | 1974-01-29 |
AU3187371A (en) | 1973-02-01 |
AU450736B2 (en) | 1974-07-18 |
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