GB727424A - Improvements in and relating to sound and like recording apparatus - Google Patents
Improvements in and relating to sound and like recording apparatusInfo
- Publication number
- GB727424A GB727424A GB1675952A GB1675952A GB727424A GB 727424 A GB727424 A GB 727424A GB 1675952 A GB1675952 A GB 1675952A GB 1675952 A GB1675952 A GB 1675952A GB 727424 A GB727424 A GB 727424A
- Authority
- GB
- United Kingdom
- Prior art keywords
- recorded
- additional
- crystal
- piezo
- pivots
- 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
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B3/00—Recording by mechanical cutting, deforming or pressing, e.g. of grooves or pits; Reproducing by mechanical sensing; Record carriers therefor
- G11B3/68—Record carriers
- G11B3/70—Record carriers characterised by the selection of material or structure; Processes or apparatus specially adapted for manufacturing record carriers
Landscapes
- Piezo-Electric Transducers For Audible Bands (AREA)
Abstract
727,424. Sound recording devices. COSMOCORD, Ltd., and KELLY, S. June 26, 1953 [July 3, 1952], No. 16759/62. Class 40 (4). In the process of cutting a gramophone record, in order to reduce background noise, the stylus is vibrated not only by the frequencies to be recorded but also by an additional frequency outside the range to be recorded, preerably above 30 kc/s. and at least twice thehighest frequency to be recorded. The direction and waveform of the superposed vibration is immaterial. In one embodiment the pivots of a moving iron armature carrying the cutting member are caused to vibrate through the action of a piezo-electric crystal fed with the additional frequency. In another embodiment, the armature is T-shaped, the horizontal piece carrying the pivots, and a crystal of barium titanate is cemented at its centre to the stem of the T for the purpose of supplying the additional vibration. Alternatively, the stem of the T may be excited magneto-strictively by a coil surrounding it. Alternatively, with a piezo-eloctric crystal type recorder the additional frequency may be superimposed electrically on the recording frequencies either by series or parallel connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1675952A GB727424A (en) | 1952-07-03 | 1952-07-03 | Improvements in and relating to sound and like recording apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1675952A GB727424A (en) | 1952-07-03 | 1952-07-03 | Improvements in and relating to sound and like recording apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB727424A true GB727424A (en) | 1955-03-30 |
Family
ID=10083125
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1675952A Expired GB727424A (en) | 1952-07-03 | 1952-07-03 | Improvements in and relating to sound and like recording apparatus |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB727424A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0062336A1 (en) * | 1981-04-08 | 1982-10-13 | TELDEC Schallplatten GmbH | Arrangement and method for cutting information into a metallic groove carrier |
-
1952
- 1952-07-03 GB GB1675952A patent/GB727424A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0062336A1 (en) * | 1981-04-08 | 1982-10-13 | TELDEC Schallplatten GmbH | Arrangement and method for cutting information into a metallic groove carrier |
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