GB2011762A - Transmission of speech - Google Patents
Transmission of speechInfo
- Publication number
- GB2011762A GB2011762A GB7841444A GB7841444A GB2011762A GB 2011762 A GB2011762 A GB 2011762A GB 7841444 A GB7841444 A GB 7841444A GB 7841444 A GB7841444 A GB 7841444A GB 2011762 A GB2011762 A GB 2011762A
- Authority
- GB
- United Kingdom
- Prior art keywords
- speech
- pilot signal
- receiver
- superimposition
- loudspeaker
- 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.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G3/00—Gain control in amplifiers or frequency changers without distortion of the input signal
- H03G3/005—Control by a pilot signal
Abstract
In speech communication systems e.g. utilizing wireless waves or transmission lines, comprising a transmitter and a receiver, the effects of audio- frequency interference (24), e.g. rustling or crackling in the loudspeaker of the receiver, are suppressed by the superimposition on the carrier of a speech- controlled low-frequency pilot signal coincidental with the superimposition of the speech signal (25), a switch (19) being provided in the audio frequency path for enabling the loudspeaker only in the presence of the pilot signal. The switch (19) is controlled by a receiver element (16) tuned to the demodulated pilot signal. <IMAGE>
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE2758714A DE2758714C2 (en) | 1977-12-29 | 1977-12-29 | Telecommunication system |
Publications (2)
Publication Number | Publication Date |
---|---|
GB2011762A true GB2011762A (en) | 1979-07-11 |
GB2011762B GB2011762B (en) | 1982-04-21 |
Family
ID=6027640
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB7841444A Expired GB2011762B (en) | 1977-12-29 | 1978-10-20 | Method and apparatus for transmission of speeck |
Country Status (5)
Country | Link |
---|---|
AT (1) | AT377137B (en) |
CH (1) | CH639513A5 (en) |
DE (1) | DE2758714C2 (en) |
GB (1) | GB2011762B (en) |
SE (1) | SE437318B (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN116055964A (en) * | 2023-01-28 | 2023-05-02 | 荣耀终端有限公司 | Speaker circuit and terminal device |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3027455A (en) * | 1959-07-27 | 1962-03-27 | Motorola Inc | Electronic circuit |
NL298885A (en) * | 1962-10-16 | |||
DE1566989A1 (en) * | 1967-04-21 | 1970-02-12 | Bbc Brown Boveri & Cie | Arrangement for tone-controlled transmission / reception switching |
DE1931263B2 (en) * | 1969-06-20 | 1971-09-30 | Stubbe-electronic, Paul K. Stubbe, 6000 Frankfurt | SELECTIVE CALL PROCEDURE FOR ELECTRIC COMMUNICATION EQUIPMENT AND DEVICE FOR ITS IMPLEMENTATION |
NL7214392A (en) * | 1972-10-25 | 1974-04-29 | ||
GB1573602A (en) * | 1975-10-06 | 1980-08-28 | Bang & Olufsen As | Methods and means for producing and reproducing sound signals |
-
1977
- 1977-12-29 DE DE2758714A patent/DE2758714C2/en not_active Expired
-
1978
- 1978-09-08 AT AT0651678A patent/AT377137B/en not_active IP Right Cessation
- 1978-10-20 GB GB7841444A patent/GB2011762B/en not_active Expired
- 1978-11-01 CH CH1126578A patent/CH639513A5/en not_active IP Right Cessation
- 1978-12-15 SE SE7812929A patent/SE437318B/en not_active IP Right Cessation
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN116055964A (en) * | 2023-01-28 | 2023-05-02 | 荣耀终端有限公司 | Speaker circuit and terminal device |
CN116055964B (en) * | 2023-01-28 | 2023-08-22 | 荣耀终端有限公司 | Speaker circuit and terminal device |
Also Published As
Publication number | Publication date |
---|---|
CH639513A5 (en) | 1983-11-15 |
AT377137B (en) | 1985-02-11 |
SE7812929L (en) | 1979-06-30 |
GB2011762B (en) | 1982-04-21 |
SE437318B (en) | 1985-02-18 |
DE2758714A1 (en) | 1979-07-05 |
DE2758714C2 (en) | 1985-10-10 |
ATA651678A (en) | 1984-06-15 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
746 | Register noted 'licences of right' (sect. 46/1977) | ||
PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19941020 |