GB258690A - Improvements in or relating to apparatus suitable for use with sound transmitting orrecording apparatus - Google Patents
Improvements in or relating to apparatus suitable for use with sound transmitting orrecording apparatusInfo
- Publication number
- GB258690A GB258690A GB1704825A GB1704825A GB258690A GB 258690 A GB258690 A GB 258690A GB 1704825 A GB1704825 A GB 1704825A GB 1704825 A GB1704825 A GB 1704825A GB 258690 A GB258690 A GB 258690A
- Authority
- GB
- United Kingdom
- Prior art keywords
- screen
- microphone
- lantern
- image
- sound
- 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
- H04R1/342—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 for microphones
Landscapes
- Health & Medical Sciences (AREA)
- Otolaryngology (AREA)
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Projection Apparatus (AREA)
Abstract
258,690. Graham, E. A. July 2, 1925. Message projected optically on screen adjacent to microphone.-The sound-receiving element of a broadcasting or public address apparatus is provided with a screen on which an image of the matter to be broadcast or amplified is projected by an optical system, thereby enabling a person to read from the image whilst directing his voice towards the sound-receiving element. As shown in Fig. 2, a microphone 3 is mounted in a case 13 on which is placed a lantern 5 for projecting an image on the screen 1. The lantern may be carried by the performer and may project the image on a screen placed directly in front of the microphone, the screen being of silk gauze or the like to enable the sounds to pass. In another modification, the lantern and screen are at one side of the casing 13. Fig. 4 shows one arrangement of the optical projecting system, in which a source of light 1<a> is placed between a reflector 11 and a condenser 12. The light passes through the film 16 to an achromatic objective lens 12a. and thence through an erecting prism 14 to the screen 1. The reading or singing matter is recorded on the film 16 which passes through a guide 15 and is adjusted by a roller 18 and handle 19. Another form of optical system shown in Fig. 5 comprises three plane mirrors 20, 21, 22 arranged with the lantern 5<a> in a casing above the microphone casing 13, and reflecting the light downwards on to a screen 1 in front of the microphone. For making sound records, a trumpet and recording-instrument replace the microphone 3. The Provisional Specification states that the microphone may be of the kind described in Specification 257,309.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1704825A GB258690A (en) | 1925-07-02 | 1925-07-02 | Improvements in or relating to apparatus suitable for use with sound transmitting orrecording apparatus |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1704825A GB258690A (en) | 1925-07-02 | 1925-07-02 | Improvements in or relating to apparatus suitable for use with sound transmitting orrecording apparatus |
Publications (1)
Publication Number | Publication Date |
---|---|
GB258690A true GB258690A (en) | 1926-09-30 |
Family
ID=10088309
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1704825A Expired GB258690A (en) | 1925-07-02 | 1925-07-02 | Improvements in or relating to apparatus suitable for use with sound transmitting orrecording apparatus |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB258690A (en) |
-
1925
- 1925-07-02 GB GB1704825A patent/GB258690A/en not_active Expired
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