GB1014417A - Electrical signal modifying apparatus - Google Patents
Electrical signal modifying apparatusInfo
- Publication number
- GB1014417A GB1014417A GB2060263A GB2060263A GB1014417A GB 1014417 A GB1014417 A GB 1014417A GB 2060263 A GB2060263 A GB 2060263A GB 2060263 A GB2060263 A GB 2060263A GB 1014417 A GB1014417 A GB 1014417A
- Authority
- GB
- United Kingdom
- Prior art keywords
- signal
- inductor
- circuit
- resistor
- resonant
- 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
- H03G5/00—Tone control or bandwidth control in amplifiers
- H03G5/02—Manually-operated control
- H03G5/04—Manually-operated control in untuned amplifiers
- H03G5/10—Manually-operated control in untuned amplifiers having semiconductor devices
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
- H03D3/00—Demodulation of angle-, frequency- or phase- modulated oscillations
- H03D3/26—Demodulation of angle-, frequency- or phase- modulated oscillations by means of sloping amplitude/frequency characteristic of tuned or reactive circuit
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Networks Using Active Elements (AREA)
Abstract
1,014,417. Equalizing networks. RANKBUSH MURPHY Ltd. May 25, 1964 [May 23, 1963], No. 20602/63. Headings H3R, H3T and H3U. An equalizing circuit to provide a specified amplitude/frequency characteristic in a signal transmission channel comprises a parallel resonant circuit in series between the signal voltage input and output, and means for inducing a variable signal current in the resonant circuit, e.g. by one or more inductors coupled with the inductor of the tuned circuit. If such inductor(s) is fed from the signal input via variable current source the induced signal will add to or subtract from the response at the resonant frequency depending on its phase. Thus in Fig. 3 signals from 1 are applied to two current sources 6, 7 whose output amplitudes can be varied differentially. Their algebraic sum flows through resistor R 2 to provide a voltage source for the resonant circle L 1 , C 1 , R 1 while the currents through inductors L 2 , L 3 induce signal currents in L 1 which respectively add to and subtract from the response at the resonant frequency. The overall characteristic is controlled by adjusting the differential output of the sources 6, 7. The inductor L 2 or L 3 may be tapped into the resistor R 2 or returned directly to earth (Figs. 5, 7, not shown). In a practical circuit (Fig. 9) signals from 11 are applied via an emitter-follower stage 13 to the emitters of further transistors 20, 23 in parallel across a common emitter resistor 24. The two inductors L 2 and L 3 provide the signals to be induced into the inductor L 1 of the resonant circuit, and transistor 23 also carries in its collector circuit the resistor 26 (to provide the voltage signal) and a frequency-correcting inductor L 4 . The overall response is controlled by potentiometer 34 which adjusts the base bias on transistor 23. If transistor 23 is required to be cut off completely a more complicated potentiometer network is necessary. The turns ratio of L 1 , L 2 need not be the same as that of L 1 , L 3 .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2060263A GB1014417A (en) | 1963-05-23 | 1963-05-23 | Electrical signal modifying apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2060263A GB1014417A (en) | 1963-05-23 | 1963-05-23 | Electrical signal modifying apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1014417A true GB1014417A (en) | 1965-12-22 |
Family
ID=10148648
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2060263A Expired GB1014417A (en) | 1963-05-23 | 1963-05-23 | Electrical signal modifying apparatus |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1014417A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2210861A1 (en) * | 1972-12-19 | 1974-07-12 | Philips Nv |
-
1963
- 1963-05-23 GB GB2060263A patent/GB1014417A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2210861A1 (en) * | 1972-12-19 | 1974-07-12 | Philips Nv |
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