GB2276260B - A tone detector - Google Patents
A tone detectorInfo
- Publication number
- GB2276260B GB2276260B GB9305845A GB9305845A GB2276260B GB 2276260 B GB2276260 B GB 2276260B GB 9305845 A GB9305845 A GB 9305845A GB 9305845 A GB9305845 A GB 9305845A GB 2276260 B GB2276260 B GB 2276260B
- Authority
- GB
- United Kingdom
- Prior art keywords
- tone detector
- tone
- detector
- Prior art date
- 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 - Fee Related
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)
- Mobile Radio Communication Systems (AREA)
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB9305845A GB2276260B (en) | 1993-03-20 | 1993-03-20 | A tone detector |
DE19944406483 DE4406483A1 (en) | 1993-03-20 | 1994-02-28 | Sound detector |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB9305845A GB2276260B (en) | 1993-03-20 | 1993-03-20 | A tone detector |
Publications (3)
Publication Number | Publication Date |
---|---|
GB9305845D0 GB9305845D0 (en) | 1993-05-05 |
GB2276260A GB2276260A (en) | 1994-09-21 |
GB2276260B true GB2276260B (en) | 1996-04-17 |
Family
ID=10732473
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB9305845A Expired - Fee Related GB2276260B (en) | 1993-03-20 | 1993-03-20 | A tone detector |
Country Status (2)
Country | Link |
---|---|
DE (1) | DE4406483A1 (en) |
GB (1) | GB2276260B (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19506544C2 (en) * | 1995-02-24 | 2001-07-12 | Siemens Ag | Method and circuit arrangement for detecting analog audio signals with a predetermined frequency |
-
1993
- 1993-03-20 GB GB9305845A patent/GB2276260B/en not_active Expired - Fee Related
-
1994
- 1994-02-28 DE DE19944406483 patent/DE4406483A1/en not_active Withdrawn
Also Published As
Publication number | Publication date |
---|---|
DE4406483A1 (en) | 1994-09-22 |
GB2276260A (en) | 1994-09-21 |
GB9305845D0 (en) | 1993-05-05 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19990320 |