CA938039A - Tone-generating circuit for energizing an electro-acoustic transducer - Google Patents
Tone-generating circuit for energizing an electro-acoustic transducerInfo
- Publication number
- CA938039A CA938039A CA119434A CA119434A CA938039A CA 938039 A CA938039 A CA 938039A CA 119434 A CA119434 A CA 119434A CA 119434 A CA119434 A CA 119434A CA 938039 A CA938039 A CA 938039A
- Authority
- CA
- Canada
- Prior art keywords
- energizing
- tone
- electro
- generating circuit
- acoustic transducer
- 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
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M19/00—Current supply arrangements for telephone systems
- H04M19/02—Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialling tone or busy tone
- H04M19/04—Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialling tone or busy tone the ringing-current being generated at the substations
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CA119434A CA938039A (en) | 1971-07-29 | 1971-07-29 | Tone-generating circuit for energizing an electro-acoustic transducer |
BE777618A BE777618A (en) | 1971-07-29 | 1971-12-31 | AUDIO FREQUENCY GENERATOR CIRCUIT INTENDED TO EXCITE AN ELECTRO-ACOUSTIC TRANSDUCER |
IT2075272A IT947704B (en) | 1971-07-29 | 1972-02-18 | TONE GENERATOR CIRCUIT FOR EXCITING AN ELECTRO ACOUSTIC TRANSDUCER |
FR7206546A FR2147558A5 (en) | 1971-07-29 | 1972-02-25 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CA119434A CA938039A (en) | 1971-07-29 | 1971-07-29 | Tone-generating circuit for energizing an electro-acoustic transducer |
Publications (1)
Publication Number | Publication Date |
---|---|
CA938039A true CA938039A (en) | 1973-12-04 |
Family
ID=4090468
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CA119434A Expired CA938039A (en) | 1971-07-29 | 1971-07-29 | Tone-generating circuit for energizing an electro-acoustic transducer |
Country Status (4)
Country | Link |
---|---|
BE (1) | BE777618A (en) |
CA (1) | CA938039A (en) |
FR (1) | FR2147558A5 (en) |
IT (1) | IT947704B (en) |
-
1971
- 1971-07-29 CA CA119434A patent/CA938039A/en not_active Expired
- 1971-12-31 BE BE777618A patent/BE777618A/en unknown
-
1972
- 1972-02-18 IT IT2075272A patent/IT947704B/en active
- 1972-02-25 FR FR7206546A patent/FR2147558A5/fr not_active Expired
Also Published As
Publication number | Publication date |
---|---|
IT947704B (en) | 1973-05-30 |
BE777618A (en) | 1972-04-17 |
FR2147558A5 (en) | 1973-03-09 |
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