GB1500002A - Transducer circuit arrangements - Google Patents
Transducer circuit arrangementsInfo
- Publication number
- GB1500002A GB1500002A GB904374A GB904374A GB1500002A GB 1500002 A GB1500002 A GB 1500002A GB 904374 A GB904374 A GB 904374A GB 904374 A GB904374 A GB 904374A GB 1500002 A GB1500002 A GB 1500002A
- Authority
- GB
- United Kingdom
- Prior art keywords
- transducer
- signal
- noise
- reproduced
- reproducer
- 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
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R3/00—Circuits for transducers, loudspeakers or microphones
- H04R3/04—Circuits for transducers, loudspeakers or microphones for correcting frequency response
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Noise Elimination (AREA)
Abstract
1500002 Transducer circuits PLESSEY CO Ltd 22 May 1975 [28 Feb 1974 20 April 1974] 9043/74 and 17411/74 Heading H4J In an arrangement for reproducing sound in a noisy environment a single transducer is switched rapidly between operating as a microphone and operating as a reproducer, with the noise picked up during operation as a microphone mixed with the signal to be reproduced during operation as a reproducer so as to cancel the noise at the point of reproduction. As described a transducer 1 is alternately fed with a signal to be reproduced through gate 4 or feeds a signal corresponding to the noise incident on the transducer through a feedback gate 5, with the gates being alternately rendered conductive at a frequency above the Nyquist sampling rate for the signals of interest. The noise signals after passing through a filter 6 which compensates for the characteristics of the transducer and the sampling, is subtracted from the input signal for application to the transducer 1 via filter 3, which can include amplification, and the resulting signal reproduced. The arrangement may be applied to a transducer located in a pilot's protective helmet to improve communications intelligibility in aircraft.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB904374A GB1500002A (en) | 1975-05-22 | 1975-05-22 | Transducer circuit arrangements |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB904374A GB1500002A (en) | 1975-05-22 | 1975-05-22 | Transducer circuit arrangements |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1500002A true GB1500002A (en) | 1978-02-08 |
Family
ID=9864296
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB904374A Expired GB1500002A (en) | 1975-05-22 | 1975-05-22 | Transducer circuit arrangements |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1500002A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2421527A1 (en) * | 1978-04-01 | 1979-10-26 | Messerschmitt Boelkow Blohm | SOUNDPROOF TRANSMITTER |
| US4622660A (en) * | 1983-02-17 | 1986-11-11 | Cowans Kenneth W | Systems and methods for signal compensation |
-
1975
- 1975-05-22 GB GB904374A patent/GB1500002A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2421527A1 (en) * | 1978-04-01 | 1979-10-26 | Messerschmitt Boelkow Blohm | SOUNDPROOF TRANSMITTER |
| US4622660A (en) * | 1983-02-17 | 1986-11-11 | Cowans Kenneth W | Systems and methods for signal compensation |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| 732 | Registration of transactions, instruments or events in the register (sect. 32/1977) | ||
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19940522 |