GB1029052A - Improvements in or relating to gain control circuit arrangements - Google Patents
Improvements in or relating to gain control circuit arrangementsInfo
- Publication number
- GB1029052A GB1029052A GB1389063A GB1389063A GB1029052A GB 1029052 A GB1029052 A GB 1029052A GB 1389063 A GB1389063 A GB 1389063A GB 1389063 A GB1389063 A GB 1389063A GB 1029052 A GB1029052 A GB 1029052A
- Authority
- GB
- United Kingdom
- Prior art keywords
- amplifier
- signal
- thermistor
- gain
- output
- 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
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/02—Details
- H04B3/04—Control of transmission; Equalising
- H04B3/10—Control of transmission; Equalising by pilot signal
- H04B3/12—Control of transmission; Equalising by pilot signal in negative-feedback path of line amplifier
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Amplifiers (AREA)
- Control Of Amplification And Gain Control (AREA)
Abstract
1,029,052. Pilot controlled A.G.C. PHILIPS ELECTRONIC & ASSOCIATED INDUSTRIES Ltd. April 8, 1963 [April 11, 1962], No. 13890/63. Heading H4R. In a carrier wave telephony system a pilotcontrolled gain arrangement comprises a signal amplifier having a gain controlling negative feedback circuit including a thermistor the current through which is derived from the pilot signal at the output of the signal amplifier. Fig. 1 shows a signal amplifier 2 from the output of which the pilot signal is extracted by filter 3 and applied via amplifier 4 to a rectifier 5, the resulting D.C. signal is amplified in amplifier 8 in whose output circuit is connected the thermistor 7 the impedance of which is reflected, via transformer 17, into the gain controlling feedback circuit 6 of amplifier 2. The D.C. amplifier 8 has negative feedback from the output circuit to the input via resistors 21 and 22, this arrangement giving a lower gain to rapid changes of pilot signal in amplifier 8 due to the thermal inertia of the thermistor.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NL277106A NL277106A (en) | 1962-04-11 | 1962-04-11 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1029052A true GB1029052A (en) | 1966-05-11 |
Family
ID=19753753
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1389063A Expired GB1029052A (en) | 1962-04-11 | 1963-04-08 | Improvements in or relating to gain control circuit arrangements |
Country Status (6)
Country | Link |
---|---|
BE (1) | BE630820A (en) |
CH (1) | CH410066A (en) |
DE (1) | DE1190994B (en) |
DK (1) | DK104420C (en) |
GB (1) | GB1029052A (en) |
NL (1) | NL277106A (en) |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB693255A (en) * | 1951-04-12 | 1953-06-24 | Automatic Telephone & Elect | Improvements in or relating to carrier current transmission systems |
NL105186C (en) * | 1958-12-12 |
-
1962
- 1962-04-11 NL NL277106A patent/NL277106A/xx unknown
-
1963
- 1963-04-06 DE DEN23000A patent/DE1190994B/en active Pending
- 1963-04-08 DK DK164163A patent/DK104420C/en active
- 1963-04-08 CH CH445963A patent/CH410066A/en unknown
- 1963-04-08 GB GB1389063A patent/GB1029052A/en not_active Expired
- 1963-04-09 BE BE630820A patent/BE630820A/xx unknown
Also Published As
Publication number | Publication date |
---|---|
NL277106A (en) | 1964-03-10 |
BE630820A (en) | 1963-11-14 |
DE1190994B (en) | 1965-04-15 |
CH410066A (en) | 1966-03-31 |
DK104420C (en) | 1966-05-16 |
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