SE344527B - - Google Patents
Info
- Publication number
- SE344527B SE344527B SE10647/69*A SE1064769A SE344527B SE 344527 B SE344527 B SE 344527B SE 1064769 A SE1064769 A SE 1064769A SE 344527 B SE344527 B SE 344527B
- 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)
- Complex Calculations (AREA)
- Interface Circuits In Exchanges (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR161172 | 1968-07-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| SE344527B true SE344527B (xx) | 1972-04-17 |
Family
ID=8653211
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| SE10647/69*A SE344527B (xx) | 1968-07-30 | 1969-07-29 |
Country Status (8)
| Country | Link |
|---|---|
| US (1) | US3683162A (xx) |
| BE (1) | BE736262A (xx) |
| CH (1) | CH504823A (xx) |
| DE (1) | DE1938804C3 (xx) |
| FR (1) | FR1603175A (xx) |
| GB (1) | GB1271528A (xx) |
| NL (1) | NL6911559A (xx) |
| SE (1) | SE344527B (xx) |
Families Citing this family (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2116224B1 (xx) * | 1970-10-29 | 1974-10-31 | Ibm France | |
| FR2164544B1 (xx) * | 1971-12-21 | 1974-09-27 | Ibm France | |
| US3732409A (en) * | 1972-03-20 | 1973-05-08 | Nasa | Counting digital filters |
| FR2295665A1 (fr) * | 1974-12-18 | 1976-07-16 | Labo Cent Telecommunicat | Recepteur numerique de signaux multifrequences |
| JPS5827546B2 (ja) * | 1975-04-22 | 1983-06-10 | 日本電気株式会社 | エンザンソウチ |
| DE2659512B1 (de) * | 1976-12-30 | 1978-05-24 | Wandel & Goltermann | Verfahren und Schaltungsanordnung zum Erzeugen eines Digitalsignals zum Pruefen einer PCM-Endstelle |
| CA1111531A (en) * | 1979-02-22 | 1981-10-27 | Jackylene K. Hood | Digital signalling receiver for receiving pcm tones |
| US4203008A (en) * | 1979-02-26 | 1980-05-13 | Northern Telecom Limited | Digital signalling receiver for receiving PCM tones |
| US4354248A (en) * | 1979-11-28 | 1982-10-12 | Motorola, Inc. | Programmable multifrequency tone receiver |
| FR2485843B1 (fr) * | 1980-06-25 | 1986-11-07 | Cit Alcatel | Recepteur numerique de frequences |
| FR2512306A1 (fr) * | 1981-08-27 | 1983-03-04 | Telecommunications Sa | Dispositif numerique de reconnaissance de frequences |
| US6140568A (en) * | 1997-11-06 | 2000-10-31 | Innovative Music Systems, Inc. | System and method for automatically detecting a set of fundamental frequencies simultaneously present in an audio signal |
| SG11202006861XA (en) * | 2018-01-26 | 2020-08-28 | California Inst Of Techn | Systems and methods for communicating by modulating data on zeros |
| CN114008985B (zh) | 2019-02-07 | 2024-03-12 | 加州理工学院 | 存在信道损伤时通过在零点上调制数据进行通信的***和方法 |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3099742A (en) * | 1959-03-13 | 1963-07-30 | Westinghouse Air Brake Co | Digital flow computer employing a logarithmic mode of computation |
| US3288940A (en) * | 1963-10-24 | 1966-11-29 | Automatic Elect Lab | Multifrequency signal receiver |
| US3404231A (en) * | 1965-01-05 | 1968-10-01 | Bell Telephone Labor Inc | Framing of pulse code transmission systems by use of an added tone signal |
| US3521041A (en) * | 1967-07-19 | 1970-07-21 | Ibm | Digital filters |
-
1968
- 1968-07-30 FR FR161172A patent/FR1603175A/fr not_active Expired
-
1969
- 1969-07-01 GB GB33267/69A patent/GB1271528A/en not_active Expired
- 1969-07-17 CH CH1091769A patent/CH504823A/fr not_active IP Right Cessation
- 1969-07-18 BE BE736262D patent/BE736262A/xx not_active IP Right Cessation
- 1969-07-29 SE SE10647/69*A patent/SE344527B/xx unknown
- 1969-07-29 NL NL6911559A patent/NL6911559A/xx unknown
- 1969-07-30 DE DE1938804A patent/DE1938804C3/de not_active Expired
- 1969-07-30 US US846030A patent/US3683162A/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| US3683162A (en) | 1972-08-08 |
| NL6911559A (xx) | 1970-02-03 |
| DE1938804C3 (de) | 1980-02-21 |
| DE1938804B2 (de) | 1979-05-23 |
| BE736262A (xx) | 1970-01-19 |
| CH504823A (fr) | 1971-03-15 |
| FR1603175A (xx) | 1971-03-22 |
| GB1271528A (en) | 1972-04-19 |
| DE1938804A1 (de) | 1970-02-05 |