IE36569L - Gain control circuits - Google Patents
Gain control circuitsInfo
- Publication number
- IE36569L IE36569L IE721000A IE100072A IE36569L IE 36569 L IE36569 L IE 36569L IE 721000 A IE721000 A IE 721000A IE 100072 A IE100072 A IE 100072A IE 36569 L IE36569 L IE 36569L
- Authority
- IE
- Ireland
- Prior art keywords
- transistors
- control
- frequency dependent
- resistor
- capacitor
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/0264—Arrangements for coupling to transmission lines
- H04L25/0278—Arrangements for impedance matching
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G5/00—Tone control or bandwidth control in amplifiers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/02—Details
- H04B3/04—Control of transmission; Equalising
- H04B3/14—Control of transmission; Equalising characterised by the equalising network used
- H04B3/141—Control of transmission; Equalising characterised by the equalising network used using multiequalisers, e.g. bump, cosine, Bode
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03878—Line equalisers; line build-out devices
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/10—Compensating for variations in line balance
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Power Engineering (AREA)
- Networks Using Active Elements (AREA)
- Filters And Equalizers (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
- Amplifiers (AREA)
- Control Of Amplification And Gain Control (AREA)
Abstract
1308877 Automatic equalizers STANDARD TELEPHONES & CABLES Ltd 23 Sept 1971 44392/71 Heading H4R In a variable equalizer, e.g. for compensating ambient temperature dependent changes in frequency response in a line transmission system, the input signal is fed to two parallel connected circuits each comprising a frequency dependent impedance and a transistor. The output signal is derived from an electrode of one of the transistors and a control signal is arranged to control the ratio of the resistances presented by the two transistors, to vary the current distribution between them and thus change the frequency response of the circuit. As shown the input signal I is applied to a transistor T3 whose collector is connected to the parallel circuits formed by transistors T1 and T2 and frequency dependent impedances Z1 and Z2. The output is taken from the collector of T2 and the impedances of the transistors T1 and T2 are differentially varied by varying the control voltages CV1 and CV2 applied to their bases. The control voltages can be derived by peak detection of the output signal 0 of the circuit. The frequency dependent networks can be formed by three parallel connected arms containing respectively a resistor, a resistor and a capacitor in series, and a capacitor.
[GB1308877A]
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB4439271 | 1971-09-23 |
Publications (2)
Publication Number | Publication Date |
---|---|
IE36569L true IE36569L (en) | 1973-03-23 |
IE36569B1 IE36569B1 (en) | 1976-12-08 |
Family
ID=10433076
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
IE1000/72A IE36569B1 (en) | 1971-09-23 | 1972-07-14 | Improvements in electric circuit arrangements |
Country Status (9)
Country | Link |
---|---|
AU (1) | AU464019B2 (en) |
BE (1) | BE789113A (en) |
CH (1) | CH551108A (en) |
DE (1) | DE2245676A1 (en) |
ES (1) | ES406937A1 (en) |
FR (1) | FR2154164A5 (en) |
GB (1) | GB1308877A (en) |
IE (1) | IE36569B1 (en) |
ZA (1) | ZA724857B (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2262089C3 (en) * | 1972-12-19 | 1975-10-30 | Philips Patentverwaltung Gmbh, 2000 Hamburg | Circuit arrangement for electronic frequency influencing, in particular electronic sound adjuster |
JPS52104840A (en) * | 1976-03-01 | 1977-09-02 | Hitachi Ltd | Variable equalizer |
-
0
- BE BE789113D patent/BE789113A/en unknown
-
1971
- 1971-09-23 GB GB4439271A patent/GB1308877A/en not_active Expired
-
1972
- 1972-07-14 IE IE1000/72A patent/IE36569B1/en unknown
- 1972-07-14 ZA ZA724857A patent/ZA724857B/en unknown
- 1972-08-28 AU AU46039/72A patent/AU464019B2/en not_active Expired
- 1972-09-18 DE DE2245676A patent/DE2245676A1/en active Pending
- 1972-09-21 FR FR7233397A patent/FR2154164A5/fr not_active Expired
- 1972-09-22 CH CH1391472A patent/CH551108A/en not_active IP Right Cessation
- 1972-09-22 ES ES406937A patent/ES406937A1/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
DE2245676A1 (en) | 1973-03-29 |
GB1308877A (en) | 1973-03-07 |
AU4603972A (en) | 1974-03-07 |
CH551108A (en) | 1974-06-28 |
ZA724857B (en) | 1973-04-25 |
FR2154164A5 (en) | 1973-05-04 |
IE36569B1 (en) | 1976-12-08 |
ES406937A1 (en) | 1975-09-01 |
BE789113A (en) | 1973-03-22 |
AU464019B2 (en) | 1975-08-14 |
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