GB603941A - Improvements in or relating to circuit arrangements for expanding the volume range of electric oscillations - Google Patents
Improvements in or relating to circuit arrangements for expanding the volume range of electric oscillationsInfo
- Publication number
- GB603941A GB603941A GB29546/45A GB2954645A GB603941A GB 603941 A GB603941 A GB 603941A GB 29546/45 A GB29546/45 A GB 29546/45A GB 2954645 A GB2954645 A GB 2954645A GB 603941 A GB603941 A GB 603941A
- Authority
- GB
- United Kingdom
- Prior art keywords
- signal
- amplitude
- pulses
- volume range
- duration
- 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
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G7/00—Volume compression or expansion in amplifiers
- H03G7/02—Volume compression or expansion in amplifiers having discharge tubes
Landscapes
- Amplitude Modulation (AREA)
Abstract
603,941. Volume range expansion. PHILIPS LAMPS, Ltd. Nov. 6, 1945, No. 29546. Convention date, July 3, 1940. [Class 40 (iv)] A volume range expander comprises a network 3 which includes a non-linear resistance and in which signals are combined with pulses the duration of which depends on the instantaneous amplitude of the signal envelope, or in which a current representing the signal envelope is combined with pulses of a duration depending on the instantaneous amplitude of the signals. It is demonstrated that with a suitably high pulse-frequency unwanted modulation products can be filtered out as at 24, the effective output consisting of currents at signal frequency having an amplitude which depends on the law connecting the signal amplitude with the pulse duration. In the arrangement described the pulse duration bears a linear relation to the signal amplitude and in consequence the output signal amplitude is proportional to the square of the input signal amplitude. In the arrangement shewn, the pulses are produced by combining envelope waves obtained by rectifying and filtering the signal, with saw-tooth waves generated at 16 in the grid circuit of valve 18, the pulse voltages appearing across the anode resistance 23.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL603941X | 1940-07-03 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB603941A true GB603941A (en) | 1948-06-25 |
Family
ID=19787867
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB29546/45A Expired GB603941A (en) | 1940-07-03 | 1945-11-06 | Improvements in or relating to circuit arrangements for expanding the volume range of electric oscillations |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB603941A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3227995A (en) * | 1962-04-04 | 1966-01-04 | Electroacustic Gmbh | System for recording sonar signals on record carrier |
-
1945
- 1945-11-06 GB GB29546/45A patent/GB603941A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3227995A (en) * | 1962-04-04 | 1966-01-04 | Electroacustic Gmbh | System for recording sonar signals on record carrier |
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