GB1164380A - Improvements relating to Hearing Aids for the Hard-of-Hearing. - Google Patents
Improvements relating to Hearing Aids for the Hard-of-Hearing.Info
- Publication number
- GB1164380A GB1164380A GB2182867A GB2182867A GB1164380A GB 1164380 A GB1164380 A GB 1164380A GB 2182867 A GB2182867 A GB 2182867A GB 2182867 A GB2182867 A GB 2182867A GB 1164380 A GB1164380 A GB 1164380A
- Authority
- GB
- United Kingdom
- Prior art keywords
- signal
- divider
- stages
- diodes
- amplitude
- 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
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G3/00—Gain control in amplifiers or frequency changers
- H03G3/20—Automatic control
- H03G3/30—Automatic control in amplifiers having semiconductor devices
- H03G3/3005—Automatic control in amplifiers having semiconductor devices in amplifiers suitable for low-frequencies, e.g. audio amplifiers
- H03G3/301—Automatic control in amplifiers having semiconductor devices in amplifiers suitable for low-frequencies, e.g. audio amplifiers the gain being continuously variable
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G1/00—Details of arrangements for controlling amplification
- H03G1/0005—Circuits characterised by the type of controlling devices operated by a controlling current or voltage signal
- H03G1/0035—Circuits characterised by the type of controlling devices operated by a controlling current or voltage signal using continuously variable impedance elements
- H03G1/0052—Circuits characterised by the type of controlling devices operated by a controlling current or voltage signal using continuously variable impedance elements using diodes
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G7/00—Volume compression or expansion in amplifiers
- H03G7/06—Volume compression or expansion in amplifiers having semiconductor devices
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R25/00—Deaf-aid sets, i.e. electro-acoustic or electro-mechanical hearing aids; Electric tinnitus maskers providing an auditory perception
- H04R25/35—Deaf-aid sets, i.e. electro-acoustic or electro-mechanical hearing aids; Electric tinnitus maskers providing an auditory perception using translation techniques
- H04R25/356—Amplitude, e.g. amplitude shift or compression
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R25/00—Deaf-aid sets, i.e. electro-acoustic or electro-mechanical hearing aids; Electric tinnitus maskers providing an auditory perception
- H04R25/50—Customised settings for obtaining desired overall acoustical characteristics
- H04R25/502—Customised settings for obtaining desired overall acoustical characteristics using analog signal processing
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Neurosurgery (AREA)
- Otolaryngology (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Control Of Amplification And Gain Control (AREA)
Abstract
1,164,380. Hearing aids; automatic gain control. PORTESCAP, LE PORTE-ECHAPPEMENT UNIVERSEL S.A. 11 May, 1967 [9 June, 1966], No. 21828/67. Headings H4J and H4R. A hearing aid with automatic gain control comprises a signal divider located between two stages of an amplification chain, the divider having at least two impedances, at least one of which is variable and is controlled by a control signal as a function of the input signal. A signal divider Z 1 , Z 2 (Fig. 1) is inserted between stages A 1 and A 2 of five amplifier stages A 1 to A 5 . A control signal from the output of stage A 4 is fed to the divider Z 1 , Z 2 over a rectifier R and amplifier A 6 . Amplifier stage A 5 permits setting of the output sound level and the frequency response. Element Z 1 is a resistor. Circuit Z 2 includes a transistor T 1 (Fig. 2) two diodes D 1 , D 2 and two resistors r 1 , r 2 . The diodes may be replaced by transistors. If a voltage of suitable polarity and amplitude is applied to the input of transistor T 1 the voltages at the terminals of diodes D 1 , D 2 permit passage of current in each of them. The impedance between point S and earth therefore decreases and thus the amplitude of the signal at point S also decreases. The rectifier R includes a transistor T 3 , two resistors r 4 , r 5 and a capacitor C and supplies a rectified voltage proportional to the amplitude of the signal. Alternatively, the signal divider (Z 1 , Z 2 ), Fig. 3 (not shown) may be inserted between stages (A 1 , A 2 ). The input signal is fed to the signal divider by a controlled amplifying chain composed of an amplifier stage (A 7 ) followed by the control chain of Fig. 2.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH841166A CH439399A (en) | 1966-06-09 | 1966-06-09 | Acoustic device for the deaf, with automatic amplification adjustment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1164380A true GB1164380A (en) | 1969-09-17 |
Family
ID=4339906
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2182867A Expired GB1164380A (en) | 1966-06-09 | 1967-05-11 | Improvements relating to Hearing Aids for the Hard-of-Hearing. |
Country Status (5)
| Country | Link |
|---|---|
| CH (1) | CH439399A (en) |
| DE (1) | DE1512743A1 (en) |
| FR (1) | FR1522158A (en) |
| GB (1) | GB1164380A (en) |
| NL (1) | NL6706460A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2618971A1 (en) * | 1975-04-30 | 1976-11-04 | Rca Corp | AUTOMATIC GAIN CONTROL |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2522451B1 (en) * | 1982-03-01 | 1988-10-14 | Audibel | IMPROVEMENT IN THE AUTOMATIC GAIN CONTROL CIRCUIT OF A TRANSISTOR AMPLIFICATION SYSTEM AND HEARING CORRECTION APPARATUS PROVIDED WITH SUCH A CIRCUIT |
-
1966
- 1966-06-09 CH CH841166A patent/CH439399A/en unknown
-
1967
- 1967-04-17 DE DE19671512743 patent/DE1512743A1/en active Pending
- 1967-05-03 FR FR13021844A patent/FR1522158A/en not_active Expired
- 1967-05-09 NL NL6706460A patent/NL6706460A/xx unknown
- 1967-05-11 GB GB2182867A patent/GB1164380A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2618971A1 (en) * | 1975-04-30 | 1976-11-04 | Rca Corp | AUTOMATIC GAIN CONTROL |
Also Published As
| Publication number | Publication date |
|---|---|
| DE1512743A1 (en) | 1969-08-07 |
| CH439399A (en) | 1967-07-15 |
| NL6706460A (en) | 1967-12-11 |
| FR1522158A (en) | 1968-04-19 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PLNP | Patent lapsed through nonpayment of renewal fees |