GB1252411A - - Google Patents
Info
- Publication number
- GB1252411A GB1252411A GB4842967A GB1252411DA GB1252411A GB 1252411 A GB1252411 A GB 1252411A GB 4842967 A GB4842967 A GB 4842967A GB 1252411D A GB1252411D A GB 1252411DA GB 1252411 A GB1252411 A GB 1252411A
- Authority
- GB
- United Kingdom
- Prior art keywords
- microphone
- frequency
- socket
- transmitter
- compensating circuit
- 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
- 206010011878 Deafness Diseases 0.000 abstract 4
- 239000013078 crystal Substances 0.000 abstract 3
- 230000001939 inductive effect Effects 0.000 abstract 2
- 210000005069 ears Anatomy 0.000 abstract 1
- 230000010370 hearing loss Effects 0.000 abstract 1
- 231100000888 hearing loss Toxicity 0.000 abstract 1
- 208000016354 hearing loss disease Diseases 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B5/00—Near-field transmission systems, e.g. inductive or capacitive transmission systems
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R27/00—Public address systems
- H04R27/02—Amplifying systems for the deaf
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Headphones And Earphones (AREA)
Abstract
1,252,411. Deaf aids. A. L. WALKER. 6 Dec., 1968 [25 Oct., 1967; 19 Dec., 1967; 2 Aug., 1968], Nos. 48429/67, 57554/67 and 36904/68. Heading H4J. A personalized hearing aid comprises a closespeaking microphone 28 (Fig. 2) for use by a partially deaf person to hear his own voice. An amplifier and a frequency compensating circuit are both common to the microphone 28 and to a receiver 2, which includes a remote reception circuit (e.g. radio or inductive loop). The frequency compensating circuit co-operates with earphones 27 to suit the audio frequency loss of the deaf person. The microphone 28 and receiver 2 are simultaneously operable and signals from both are subject to similar frequency compensation. A transmitter 1 (Fig. 1) for use by a tutor transmits to the receiver 2. A case 4 of " hipflask " shape utilizes plug-in circuit modules. A transmitter microphone 6 is covered with a grille and feeds an F.M. transmitter module (not shown). A rotary on/off switch 8, a socket 9 for an aerial 10 and an input socket 13 for connection to a tape recorder or radio are provided on the transmitter 1. The radio frequency of the transmitter 1 is controlled by a plug-in crystal which can be changed if a different frequency is required. The receiver 2 has a "hip-flask" case 5 housing an F.M. crystal controlled transistor tuner module 14 (Fig. 3), an A.F. amplifier module 15 and a compensating circuit module 16. One of a number of crystals 17 is selected by a switch 20 in accordance with the radio frequency of the transmitter 1, a coloured button 19 indicating the channel in use. Alternatively, the transmitter 1 may selectively switch the receiver 2 to the correct channel. A combined on/off switch and volume control 22 is provided together with a three-position switch 23, a socket 24 for use with a tape recorder or microphone, and a socket assembly 25 which connects earphones 27 to the output of the frequency compensating circuit 16, boom microphone 28 to the input of amplifier 15 and an aerial (which may be provided by the headset and its downlead) to the tuner module 14. The positions of switch 23 are (1) socket 24 and microphone 28 operative, (2) tuner module 14, socket 24 and microphone 28 operative, (3) tuner module 14 and socket 24 operative. The headset 3 may be replaced by a monaural earpiece fitted to an ear mould, an external microphone being connected to the socket 24 and mounted on a lapel or clipped on to a pocket. Six frequency characteristics are given for the frequency compensating circuit, together with a flat response (Fig. 4, not shown). When hearing loss is total in one ear the frequency compensating circuit compensates for loss in the other ear. When the ears have different audiograms two separate compensating circuits are provided, one for each ear, or different earphones may co-operate with a single compensating circuit. The two earphones may be energized at different volume levels. The earphones may each have two transducers, responsive to high and low frequencies respectively. The compensating circuit module 16 may be replaced by tone controls. Several people may be provided with identical transmitters. Where an inductive loop is provided, this may be supplied by a radio frequency loop.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB4842967 | 1967-10-25 | ||
GB5755467 | 1967-12-19 | ||
GB3690468 | 1968-08-02 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1252411A true GB1252411A (en) | 1971-11-03 |
Family
ID=27259400
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB4842967A Expired GB1252411A (en) | 1967-10-25 | 1967-10-25 |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB1252411A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4790019A (en) * | 1984-07-18 | 1988-12-06 | Viennatone Gesellschaft M.B.H. | Remote hearing aid volume control |
US4918736A (en) * | 1984-09-27 | 1990-04-17 | U.S. Philips Corporation | Remote control system for hearing aids |
-
1967
- 1967-10-25 GB GB4842967A patent/GB1252411A/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4790019A (en) * | 1984-07-18 | 1988-12-06 | Viennatone Gesellschaft M.B.H. | Remote hearing aid volume control |
US4918736A (en) * | 1984-09-27 | 1990-04-17 | U.S. Philips Corporation | Remote control system for hearing aids |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
CSNS | Application of which complete specification have been accepted and published, but patent is not sealed |