Sound recording

Details Sound recording Sound recording

1979-03-13

1981-01-27

Shepperd, John W.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Mechanical modification or sensing of storage medium

369170, G11B 344

Patent

active

042471206

ABSTRACT:
A needle for the acoustic sound box of old phonographs and gramophones is provided with a tip comprising a bearing plate which runs on the top surface of the recording on either side of a groove and a point which conforms to the groove. Both the bearing plate and the point comprise or consist of a low-friction polymer, especially polytetrafluoroethylene. The tip may be coated with the polymer or may be made therefrom, including the case where it deforms during playing to conform to the groove. The needle is especially useful in the re-recording of old cylinders and records using a microphone to capture the sound emanating from the horn or the phonograph or gramophone.

REFERENCES:
patent: 1718035 (1929-06-01), Douglass
patent: 1836591 (1931-12-01), Hall
patent: 1879722 (1932-09-01), Walton
patent: 3104109 (1963-09-01), Bodkin
patent: 3190971 (1965-06-01), Lowell

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