GB458741A - Improvements in or relating to the production of noiseless sound film records - Google Patents
Improvements in or relating to the production of noiseless sound film recordsInfo
- Publication number
- GB458741A GB458741A GB22176/36A GB2217636A GB458741A GB 458741 A GB458741 A GB 458741A GB 22176/36 A GB22176/36 A GB 22176/36A GB 2217636 A GB2217636 A GB 2217636A GB 458741 A GB458741 A GB 458741A
- Authority
- GB
- United Kingdom
- Prior art keywords
- amplifier
- class
- sound
- recording device
- amplification
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/36—Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest
- B23K35/3601—Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest with inorganic compounds as principal constituents
- B23K35/3603—Halide salts
Landscapes
- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Amplifiers (AREA)
Abstract
458,741. Optical sound recording. KLANGFILM GES., 19, Saarlandstrasse, Berlin. Aug. 12, 1936, No. 22176. Convention date, Sept. 9, 1935. [Class 40 (ii)] [See also Group XL] For producing noiseless sound film records, electric sound currents are applied to the recording device through a class B amplifier, and the unidirectional current which flows in the plate circuit of the amplifier is utilized to bias the recording device in dependence on the amplitude of the sound currents. In addition, the unidirectional current may be used to control the amplification of the sound currents. As shown in Fig. 2, the recording device 10 is fed through a transformer by the class B amplifier and, the unidirectional current in the plate circuit K of this amplifier controls the bias of the recording device through a unilaterally conducting device 1 and resistances 2, 3 in conjunction with condensers 4, 9 This plate current also operates through resistances 5, 6, 7 on the grid bias of a preceding valve 8 to control the amplification of the sound currents. The grid bias battery 12 is here arranged across the resistance 7 in such a way that the amplification control operates only when the unidirectional plate current of the class B amplifier exceeds a given value. In a modification, the grid bias battery is in series with the resistance 7, and the amplification control extends over the whole range of amplitudes.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE458741X | 1935-09-09 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB458741A true GB458741A (en) | 1936-12-24 |
Family
ID=6539486
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB22176/36A Expired GB458741A (en) | 1935-09-09 | 1936-08-12 | Improvements in or relating to the production of noiseless sound film records |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB458741A (en) |
-
1936
- 1936-08-12 GB GB22176/36A patent/GB458741A/en not_active Expired
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