GB684612A - Improvements in audio limiter circuits - Google Patents
Improvements in audio limiter circuitsInfo
- Publication number
- GB684612A GB684612A GB32233/49A GB3223349A GB684612A GB 684612 A GB684612 A GB 684612A GB 32233/49 A GB32233/49 A GB 32233/49A GB 3223349 A GB3223349 A GB 3223349A GB 684612 A GB684612 A GB 684612A
- Authority
- GB
- United Kingdom
- Prior art keywords
- microphone
- output
- capsule
- energizing
- rectified
- 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
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G5/00—Tone control or bandwidth control in amplifiers
- H03G5/16—Automatic control
- H03G5/18—Automatic control in untuned amplifiers
- H03G5/20—Automatic control in untuned amplifiers having discharge tubes
-
- 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
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Details Of Audible-Bandwidth Transducers (AREA)
Abstract
684,612. Automatic volume control. RADIO CORPORATION OF AMERICA. Dec. 15, 1949 [Dec. 15, 1948], No. 32233/49. Class 40 (iv). The energizing voltage of a carbon-granule microphone is varied in accordance with its output, thereby effecting volume compression. As shown, Fig. 3, the output from the microphone 41 is fed via the transformer 44 to the amplifying valve 50 whose output is rectified at 60 and after smoothing is applied to the grid of the triode 21 to increase its anode-cathode impedance which is in series with the energizing battery 20 for the microphone. Condenser 19 provides a by-pass for the A.C. output of the microphone. The value of condenser 46 may be chosen so as to cause the compression to be more effective at higher frequencies. In a modification, Fig. 4 (not shown), in which highgain components are used, the amplifier stage 50 is omitted. In a further modification, Fig. 5 (not shown), the diode 60 is omitted, rectification being effected by the grid-cathode portion of valve 21. Fig. 1 (not shown) indicates an arrangement in which a double-capsule microphone is used in which the output of one capsule is rectified and used to vary a thermionic impedance in the energizing circuit of the other capsule.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US684612XA | 1948-12-15 | 1948-12-15 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB684612A true GB684612A (en) | 1952-12-24 |
Family
ID=22082726
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB32233/49A Expired GB684612A (en) | 1948-12-15 | 1949-12-15 | Improvements in audio limiter circuits |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB684612A (en) |
-
1949
- 1949-12-15 GB GB32233/49A patent/GB684612A/en not_active Expired
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