GB1093608A - Improvements in or relating to microphones - Google Patents
Improvements in or relating to microphonesInfo
- Publication number
- GB1093608A GB1093608A GB2887566A GB2887566A GB1093608A GB 1093608 A GB1093608 A GB 1093608A GB 2887566 A GB2887566 A GB 2887566A GB 2887566 A GB2887566 A GB 2887566A GB 1093608 A GB1093608 A GB 1093608A
- Authority
- GB
- United Kingdom
- Prior art keywords
- transistor
- resistance
- relays
- handset
- light
- 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
- H04R3/00—Circuits for transducers, loudspeakers or microphones
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/94—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated
- H03K17/96—Touch switches
- H03K17/9645—Resistive touch switches
-
- 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
- H04R1/02—Casings; Cabinets ; Supports therefor; Mountings therein
- H04R1/04—Structural association of microphone with electric circuitry therefor
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Electronic Switches (AREA)
- Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)
Abstract
1,093,608. Microphones. STANDARD TELEPHONES & CABLES Ltd. June 28, 1966, No. 28875/66. Headings H3T and H4J. [Also in Division G5] A microphone handset comprising a transducer unit 1 (Fig. 1), in a housing includes a pair of resistively interconnected electric terminals 4 and 5 acting as a switch and responsive to the placing of a finger or thumb on to a predetermined surface region 3 to significantly alter the resistance between the two terminals 4, 5. The handset is for use with a dictation machine having relays for record (R), playback (P) and backspace (B) and preferably three regions are provided. In a second form of handset, Fig. 2 (not shown), the three regions have four vertical conductive strips (8), the first and third strips being interconnected and the strips in each region being so dimensioned that the placing thereon of a finger or thumb significantly alters the resistance between the interconnected pairs of strips. Local circuit.-Each stage (Fig. 3), comprises a low noise transistor T1 having its collector connected to the base of a Darlington connection T2, T3. Relays S1 are situated on the emitter circuit of the final transistor T3 of a different stage. In operation, the transistors are normally " off." Placing a finger or thumb across the appropriate touch contact lowers the contact resistance, causing the transistor T1 to switch on and thereby, through the Darlington pair T2, T3, energize the relay S1. The final emitters of the first and second stages are interconnected by a diode D1 so that, while touch contact P is bridged, both the first and second stages are switched to energize two relays S1. Handset using light source.-A handset (Fig. 4) contains a transducer unit 10 and has a light bulb 12 or gallium arsenide infra-red emitter (not shown), the light being focused by a plastics lens on to silicon or other photooonductive cells R, P, B. Shields 14, 15 for the light source 12 and photo-cells are provided, together with individual light guides 16. With the light source energized the photocells are in a low resistance condition. Placing a finger or thumb in a guide 16 blocks the light from the respective cell, whose resistance is thereby increased. Local circuit.-Two transistors T4, T5 (Fig. 6) in a Darlington connection are located in the handle 11. Relays S2 on the recording machine effect the appropriate function and are each situated in the collector circuit of a final transistor T5. The base bias of each transistor T4 includes a photo-cell. A relay S2 is energized by cutting off the light from the appropriate photo-cell, increasing the resistance of the cell so that the associated Darlington pair T4, T5 is switched on to energize the relay. Two relays are energized by one cell P by a coupling 17 between the emitter of the final transistor T5 of the first stage with the final transistor of the second stage. If the bulb 12 holding the relays " off " fails, a trip circuit comprising a transistor T6 deriving its condition from a resistance R2 in series with the bulb 12 provides a return path for the relay driving stages. In the case of bulb failure, the transistor T6 will switch off removing the return path from the driving stages. A diode D2 in the emitter circuit of transistor T6 provides reverse bias, switching the remaining transistors normally off. This provides temperature stability.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2887566A GB1093608A (en) | 1966-06-28 | 1966-06-28 | Improvements in or relating to microphones |
DE19671512714 DE1512714A1 (en) | 1966-06-28 | 1967-06-19 | Handheld microphone |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2887566A GB1093608A (en) | 1966-06-28 | 1966-06-28 | Improvements in or relating to microphones |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1093608A true GB1093608A (en) | 1967-12-06 |
Family
ID=10282575
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB2887566A Expired GB1093608A (en) | 1966-06-28 | 1966-06-28 | Improvements in or relating to microphones |
Country Status (2)
Country | Link |
---|---|
DE (1) | DE1512714A1 (en) |
GB (1) | GB1093608A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2237918A (en) * | 1989-08-16 | 1991-05-15 | Asahi Optical Co Ltd | Recording/reproducing apparatus |
CN103687147A (en) * | 2012-09-17 | 2014-03-26 | 深圳市海洋王照明工程有限公司 | Lamp control circuit and lamp |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2915774C2 (en) * | 1979-04-19 | 1983-08-04 | A. Grothe & Söhne KG, 5000 Köln | Telephone and / or intercom station with a handset |
-
1966
- 1966-06-28 GB GB2887566A patent/GB1093608A/en not_active Expired
-
1967
- 1967-06-19 DE DE19671512714 patent/DE1512714A1/en active Pending
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2237918A (en) * | 1989-08-16 | 1991-05-15 | Asahi Optical Co Ltd | Recording/reproducing apparatus |
US5337292A (en) * | 1989-08-16 | 1994-08-09 | Asahi Kogaku Kogyo Kabushiki Kaisha | Recording/reproducing apparatus with remote controller |
GB2237918B (en) * | 1989-08-16 | 1994-08-24 | Asahi Optical Co Ltd | Recording/Reproducing system and remote control |
US5475659A (en) * | 1989-08-16 | 1995-12-12 | Asahi Kogaku Kogyo Kabushiki Kaisha | Recording/reproducing apparatus |
CN103687147A (en) * | 2012-09-17 | 2014-03-26 | 深圳市海洋王照明工程有限公司 | Lamp control circuit and lamp |
Also Published As
Publication number | Publication date |
---|---|
DE1512714A1 (en) | 1969-08-07 |
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