JPS50147808A - - Google Patents
Info
- Publication number
- JPS50147808A JPS50147808A JP49055050A JP5505074A JPS50147808A JP S50147808 A JPS50147808 A JP S50147808A JP 49055050 A JP49055050 A JP 49055050A JP 5505074 A JP5505074 A JP 5505074A JP S50147808 A JPS50147808 A JP S50147808A
- 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.)
- Granted
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
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 |
|---|---|---|---|
| JP5505074A JPS5548752B2 (https=) | 1974-05-17 | 1974-05-17 | |
| US05/577,155 US4001521A (en) | 1974-05-17 | 1975-05-14 | Signal identification system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5505074A JPS5548752B2 (https=) | 1974-05-17 | 1974-05-17 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS50147808A true JPS50147808A (https=) | 1975-11-27 |
| JPS5548752B2 JPS5548752B2 (https=) | 1980-12-08 |
Family
ID=12987832
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5505074A Expired JPS5548752B2 (https=) | 1974-05-17 | 1974-05-17 |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US4001521A (https=) |
| JP (1) | JPS5548752B2 (https=) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL7511707A (nl) * | 1975-10-06 | 1977-04-12 | Philips Nv | Kruiscorrelatie-inrichting. |
| US4185172A (en) * | 1976-12-17 | 1980-01-22 | Cselt - Centro Studi E Laboratori Telecomunicazioni S.P.A. | Method of and means for detecting digitized multi frequency-coded signals |
| NL177552C (nl) * | 1979-05-02 | 1985-10-01 | Nederlanden Staat | Inrichting voor het onder gebruikmaking van een digitale correlatiemethode vaststellen van de aanwezigheid van elke van een aantal vaste frequenties in een signaal. |
| US4333150A (en) * | 1980-01-28 | 1982-06-01 | Westinghouse Electric Corp. | Signal receiving apparatus and method |
| US4363100A (en) * | 1980-10-28 | 1982-12-07 | Northern Telecom Limited | Detection of tones in sampled signals |
| JPS59141755U (ja) * | 1983-03-14 | 1984-09-21 | アロン化成株式会社 | 園芸用ケ−ス |
| US4783845A (en) * | 1985-12-20 | 1988-11-08 | Itt Aerospace Optical | Digital tone squelch detector |
| JP5668003B2 (ja) * | 2012-03-09 | 2015-02-12 | 株式会社東芝 | 信号識別装置 |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3652805A (en) * | 1969-10-10 | 1972-03-28 | Information Control Systems In | Binary frequency identification system |
| US3863030A (en) * | 1972-06-01 | 1975-01-28 | Gte Automatic Electric Lab Inc | Pcm tone receiver using digital spectrum analysis |
| CA984068A (en) * | 1972-08-10 | 1976-02-17 | Alexander D. Proudfoot | Method and apparatus for detecting the presence of signal components of predetermined frequency in a multi-frequency signal |
| US3812432A (en) * | 1973-01-05 | 1974-05-21 | Bell Telephone Labor Inc | Tone detector |
-
1974
- 1974-05-17 JP JP5505074A patent/JPS5548752B2/ja not_active Expired
-
1975
- 1975-05-14 US US05/577,155 patent/US4001521A/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| US4001521A (en) | 1977-01-04 |
| JPS5548752B2 (https=) | 1980-12-08 |