JPS535002B2 - - Google Patents
Info
- Publication number
- JPS535002B2 JPS535002B2 JP7759772A JP7759772A JPS535002B2 JP S535002 B2 JPS535002 B2 JP S535002B2 JP 7759772 A JP7759772 A JP 7759772A JP 7759772 A JP7759772 A JP 7759772A JP S535002 B2 JPS535002 B2 JP S535002B2
- 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
- H04Q1/457—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)
- Input From Keyboards Or The Like (AREA)
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
- Devices For Supply Of Signal Current (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US17552471A | 1971-08-27 | 1971-08-27 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS4831808A JPS4831808A (https=) | 1973-04-26 |
| JPS535002B2 true JPS535002B2 (https=) | 1978-02-23 |
Family
ID=22640563
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7759772A Expired JPS535002B2 (https=) | 1971-08-27 | 1972-08-01 |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JPS535002B2 (https=) |
| BE (1) | BE782055A (https=) |
| FR (1) | FR2151815A5 (https=) |
| GB (1) | GB1378818A (https=) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3941942A (en) * | 1974-01-02 | 1976-03-02 | Motorola, Inc. | Two of eight tone encoder |
| FR2280141A1 (fr) * | 1974-07-26 | 1976-02-20 | Materiel Telephonique | Systeme de signalisation entre centres de traitement d'informations |
| US4061886A (en) * | 1975-09-29 | 1977-12-06 | Mostek Corporation | Dual tone multiple frequency generator |
| US4087638A (en) * | 1976-10-01 | 1978-05-02 | Telaris Telecommunications Inc. | DTMF Communication system |
| JPS53145507A (en) * | 1977-05-25 | 1978-12-18 | Fujitsu Ltd | Pb signal transmitting system |
-
1972
- 1972-03-24 GB GB1396572A patent/GB1378818A/en not_active Expired
- 1972-04-13 BE BE782055A patent/BE782055A/xx unknown
- 1972-05-29 FR FR7219139A patent/FR2151815A5/fr not_active Expired
- 1972-08-01 JP JP7759772A patent/JPS535002B2/ja not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| GB1378818A (en) | 1974-12-27 |
| FR2151815A5 (https=) | 1973-04-20 |
| JPS4831808A (https=) | 1973-04-26 |
| BE782055A (fr) | 1972-07-31 |