GB319921A - Improvements in gramophone and like sound boxes - Google Patents
Improvements in gramophone and like sound boxesInfo
- Publication number
- GB319921A GB319921A GB27078/28A GB2707828A GB319921A GB 319921 A GB319921 A GB 319921A GB 27078/28 A GB27078/28 A GB 27078/28A GB 2707828 A GB2707828 A GB 2707828A GB 319921 A GB319921 A GB 319921A
- Authority
- GB
- United Kingdom
- Prior art keywords
- disc
- sound
- diaphragm
- box
- gramophone
- 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
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
- H04R1/32—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only
- H04R1/34—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by using a single transducer with sound reflecting, diffracting, directing or guiding means
- H04R1/38—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by using a single transducer with sound reflecting, diffracting, directing or guiding means in which sound waves act upon both sides of a diaphragm and incorporating acoustic phase-shifting means, e.g. pressure-gradient microphone
Landscapes
- Health & Medical Sciences (AREA)
- Otolaryngology (AREA)
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Telephone Set Structure (AREA)
Abstract
319,921. Parker, T. H. Sept. 21, 1928. Sound-boxes. - A sound-box for gramophones &c. is provided with a sound-baffling device in the form of a main disc 5 and a superimposed disc 6 inserted between the diaphragm 1 and the back 4 of the sound-box, such superimposed disc 6 being provided with one or more spiral grooves 7 and having a central tubular extension 8 communicating through an aperture in the main disc 5 with the tone-arm. The diaphragm 1 and the discs 5, 6 may be resiliently mounted, as at 2, by means of split rubber rings. If desired, the disc 6 may be of dish shape and mounted in the same rubber ring as the diaphragm 1. A series of spirally grooved discs 6 may be mounted on the main disc 5 in such manner that their tubular outlets nest one within another.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB27078/28A GB319921A (en) | 1928-09-21 | 1928-09-21 | Improvements in gramophone and like sound boxes |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB27078/28A GB319921A (en) | 1928-09-21 | 1928-09-21 | Improvements in gramophone and like sound boxes |
Publications (1)
Publication Number | Publication Date |
---|---|
GB319921A true GB319921A (en) | 1929-10-03 |
Family
ID=10253800
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB27078/28A Expired GB319921A (en) | 1928-09-21 | 1928-09-21 | Improvements in gramophone and like sound boxes |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB319921A (en) |
-
1928
- 1928-09-21 GB GB27078/28A patent/GB319921A/en not_active Expired
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