JPS4731512A - - Google Patents
Info
- Publication number
- JPS4731512A JPS4731512A JP530772A JP530772A JPS4731512A JP S4731512 A JPS4731512 A JP S4731512A JP 530772 A JP530772 A JP 530772A JP 530772 A JP530772 A JP 530772A JP S4731512 A JPS4731512 A JP S4731512A
- 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.)
- Pending
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/30—Systems using multi-frequency codes wherein each code element is represented by a combination of frequencies
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J1/00—Frequency-division multiplex systems
- H04J1/02—Details
- H04J1/08—Arrangements for combining channels
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Circuits Of Receivers In General (AREA)
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
- Dc Digital Transmission (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR7108190A FR2127450A5 (ja) | 1971-03-03 | 1971-03-03 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS4731512A true JPS4731512A (ja) | 1972-11-11 |
| JPS5422730B1 JPS5422730B1 (ja) | 1979-08-08 |
Family
ID=9073232
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP530772A Pending JPS5422730B1 (ja) | 1971-03-03 | 1972-01-12 |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JPS5422730B1 (ja) |
| DE (1) | DE2208367A1 (ja) |
| FR (1) | FR2127450A5 (ja) |
| GB (1) | GB1318499A (ja) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3936801A (en) * | 1974-09-12 | 1976-02-03 | Bell Telephone Laboratories, Incorporated | Multifrequency signal receiver timing circuit |
| CA1031086A (en) * | 1976-03-03 | 1978-05-09 | Northern Electric Company | Method and apparatus for translating multiple frequency signalling |
| DE3026016C2 (de) * | 1980-07-09 | 1984-12-13 | Siemens AG, 1000 Berlin und 8000 München | Schaltungsanordnung zur Demodulation von Frequenzgemischen, die an einer Zentralstation empfangen werden |
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1971
- 1971-03-03 FR FR7108190A patent/FR2127450A5/fr not_active Expired
-
1972
- 1972-01-12 JP JP530772A patent/JPS5422730B1/ja active Pending
- 1972-01-28 GB GB405172A patent/GB1318499A/en not_active Expired
- 1972-02-23 DE DE2208367A patent/DE2208367A1/de active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| DE2208367A1 (de) | 1973-10-25 |
| JPS5422730B1 (ja) | 1979-08-08 |
| GB1318499A (en) | 1973-05-31 |
| FR2127450A5 (ja) | 1972-10-13 |