GB1341828A - Sound actuated indicating apparatus - Google Patents

Sound actuated indicating apparatus

Info

Publication number
GB1341828A
GB1341828A GB1341828DA GB1341828A GB 1341828 A GB1341828 A GB 1341828A GB 1341828D A GB1341828D A GB 1341828DA GB 1341828 A GB1341828 A GB 1341828A
Authority
GB
United Kingdom
Prior art keywords
resistors
transistor
signal
increase
attenuation
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
Application number
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hourie J K
Original Assignee
Hourie J K
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Hourie J K filed Critical Hourie J K
Publication of GB1341828A publication Critical patent/GB1341828A/en
Expired legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F11/00—Methods or devices for treatment of the ears or hearing sense; Non-electric hearing aids; Methods or devices for enabling ear patients to achieve auditory perception through physiological senses other than hearing sense; Protective devices for the ears, carried on the body or in the hand
    • A61F11/04—Methods or devices for enabling ear patients to achieve auditory perception through physiological senses other than hearing sense, e.g. through the touch sense
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09B—EDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
    • G09B21/00—Teaching, or communicating with, the blind, deaf or mute
    • G09B21/009—Teaching or communicating with deaf persons

Abstract

1341828 Gain control J K HOURIE 31 Dec 1970 [31 Dec 1969] 63576/69 Heading H4R [Also in Divisions G4 and G5] Apparatus for converting sound into indications for appreciation by optical or tactile sensation or by electric current through the body, e.g. for assisting the hard of hearing or for use in teaching (see Division G5), includes an automatic gain control circuit in which an increase in the power dissipated by a transistor Q1 causes an increase in the attenuation which the circuit provides. Resistors R1, R2 provide the base current for a transistor Q2 used in an emitter follower circuit. R8 is the emitter load resistor. Because of a capacitor Cl the power dissipated by transistor Q1 is supplied only by the input signal. When the signal amplitude is low, Q1 is in a non-conducting state and the attenuation is negligible. The bias current for Q1 is derived from the output signal by means of diodes D3, D4 and capacitors C2, C3. An increase in amplitude of the output signal causes Q1 to dissipate more energy thereby increasing the attenuation due to the potentiometer comprising resistors R1, R2 and transistor Q1. The diodes D1 and D2 rectify the signal before presentation to the collector of Q1 so that energy is dissipated on both half cycles. Resistors R3 and R4 minimise the distortion of the signal waveform. The time constants of the A.G.C. action are determined by resistors R5, R6 and R7 and capacitor C2.
GB1341828D 1970-12-31 1970-12-31 Sound actuated indicating apparatus Expired GB1341828A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB6357669 1970-12-31

Publications (1)

Publication Number Publication Date
GB1341828A true GB1341828A (en) 1973-12-25

Family

ID=10489149

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1341828D Expired GB1341828A (en) 1970-12-31 1970-12-31 Sound actuated indicating apparatus

Country Status (1)

Country Link
GB (1) GB1341828A (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4382793A (en) * 1981-12-09 1983-05-10 Anderson Douglas F Device for feeling audio amplifier output
EP0088521A2 (en) * 1982-02-16 1983-09-14 Deborah New Improvements in sound display systems
GB2138616A (en) * 1983-04-11 1984-10-24 Anatronics Of Texas Inc Warning system for the deaf
GB2139385A (en) * 1983-03-29 1984-11-07 Edward Malcolm Jeffrey Self annunciator
GB2185141A (en) * 1985-12-31 1987-07-08 Terence Keith Parker Communication and/or warning system
GB2189915A (en) * 1986-04-30 1987-11-04 Ozen Corp Driving an actuator with a sound signal
GB2221070A (en) * 1988-06-22 1990-01-24 Nicholas Mark Francis Adams An alarm adaptor for the deaf
NL1036585C2 (en) * 2009-02-17 2010-08-18 Petrus Hubertus Peters MUSIC FOR Deaf People.

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4382793A (en) * 1981-12-09 1983-05-10 Anderson Douglas F Device for feeling audio amplifier output
EP0088521A2 (en) * 1982-02-16 1983-09-14 Deborah New Improvements in sound display systems
EP0088521A3 (en) * 1982-02-16 1984-05-23 Deborah New Improvements in sound display systems
GB2139385A (en) * 1983-03-29 1984-11-07 Edward Malcolm Jeffrey Self annunciator
GB2138616A (en) * 1983-04-11 1984-10-24 Anatronics Of Texas Inc Warning system for the deaf
GB2185141A (en) * 1985-12-31 1987-07-08 Terence Keith Parker Communication and/or warning system
GB2189915A (en) * 1986-04-30 1987-11-04 Ozen Corp Driving an actuator with a sound signal
GB2189915B (en) * 1986-04-30 1989-12-06 Ozen Corp An arrangement for driving an actuator in accordance with a sound signal
GB2221070A (en) * 1988-06-22 1990-01-24 Nicholas Mark Francis Adams An alarm adaptor for the deaf
GB2221070B (en) * 1988-06-22 1992-11-18 Nicholas Mark Francis Adams An alarm adaptor for the deaf
NL1036585C2 (en) * 2009-02-17 2010-08-18 Petrus Hubertus Peters MUSIC FOR Deaf People.

Similar Documents

Publication Publication Date Title
JPS59100269U (en) Integrated circuit with power supply voltage level detection function
GB1341828A (en) Sound actuated indicating apparatus
ES480910A1 (en) Device for the generation of a control voltage across a piezo-electric positioning element
GB1370788A (en) Peak detector
DE3366481D1 (en) Measuring device
GB1152035A (en) Improvements in or relating to D.C. Restoring Circuits
GB760461A (en) Transistor circuit for generating linear sweep signals
GB1248857A (en) An audio-frequency dynamic sound range compressor
GB893405A (en) Improvements in electronic analogue computer circuits
GB1065326A (en)
DE2963885D1 (en) A device for generating an electric output signal in response to the positioning of a mechanical member and an equipment for controlling the draught in a boiler, preferably an oil-fired boiler, including such a device
JPS6155311B2 (en)
GB906068A (en) Improvements in or relating to virtual-earth amplifiers
JPS5233452A (en) Amplifier unit
GB885250A (en) Electrical signal correlating circuit
GB1430822A (en) High speed signal integrator circuit
ES2039518T3 (en) DIGITAL IMPULSE EMITTER.
SU699659A1 (en) Pulse shaper
ES384437A1 (en) Information transmitting device
GB1009589A (en) Improvements relating to non-linear electrical circuits
GB838900A (en) Arrangements for the automatic sharp tuning of oscillatory circutis
GB939809A (en) Improvements in or relating to electrical circuits
JPS54151836A (en) Electrostatic recording electrode drive device
JPS54117663A (en) Amplifier
GB934617A (en) Amplifier and two-phase motor control circuit

Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees