JPS5651679B2 - - Google Patents
Info
- Publication number
- JPS5651679B2 JPS5651679B2 JP11763575A JP11763575A JPS5651679B2 JP S5651679 B2 JPS5651679 B2 JP S5651679B2 JP 11763575 A JP11763575 A JP 11763575A JP 11763575 A JP11763575 A JP 11763575A JP S5651679 B2 JPS5651679 B2 JP S5651679B2
- Authority
- JP
- Japan
- 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
- H04Q1/453—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)
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP50117635A JPS5242308A (en) | 1975-10-01 | 1975-10-01 | Multiplex frequency signal receiver |
| US05/727,346 US4085295A (en) | 1975-10-01 | 1976-09-28 | Multi-frequency signal receivers |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP50117635A JPS5242308A (en) | 1975-10-01 | 1975-10-01 | Multiplex frequency signal receiver |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5242308A JPS5242308A (en) | 1977-04-01 |
| JPS5651679B2 true JPS5651679B2 (en:Method) | 1981-12-07 |
Family
ID=14716573
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP50117635A Granted JPS5242308A (en) | 1975-10-01 | 1975-10-01 | Multiplex frequency signal receiver |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US4085295A (en:Method) |
| JP (1) | JPS5242308A (en:Method) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3027047B2 (ja) * | 1992-01-29 | 2000-03-27 | キヤノン株式会社 | Ｄｔｍｆ信号検出装置及び方法 |
| 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 |
| KR100430513B1 (ko) * | 1996-01-26 | 2004-10-14 | 코닌클리케 필립스 일렉트로닉스 엔.브이. | 개량된톤검출기능을구비한송신시스템,단말,톤검출기및동시에송신된복수의톤신호들을수신하는방법 |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3140357A (en) * | 1962-06-28 | 1964-07-07 | Bell Telephone Labor Inc | Multifrequency receiver |
| BE634529A (en:Method) * | 1963-07-05 | |||
| JPS5138484B1 (en:Method) * | 1970-07-03 | 1976-10-22 | ||
| US3715518A (en) * | 1971-12-08 | 1973-02-06 | Bell Telephone Labor Inc | Interrupt network to protect a voice frequency signal detector from being talked-off by outgoing speech signals |
| CA976675A (en) * | 1972-10-16 | 1975-10-21 | Microsystems International Limited | Dual tone receiver |
| US3934096A (en) * | 1973-04-27 | 1976-01-20 | Hitachi, Ltd. | Multi-frequency signal receiving circuit |
-
1975
- 1975-10-01 JP JP50117635A patent/JPS5242308A/ja active Granted
-
1976
- 1976-09-28 US US05/727,346 patent/US4085295A/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| US4085295A (en) | 1978-04-18 |
| JPS5242308A (en) | 1977-04-01 |