GB559535A - Detector and automatic volume control circuit for frequency modulation receivers - Google Patents
Detector and automatic volume control circuit for frequency modulation receiversInfo
- Publication number
- GB559535A GB559535A GB11665/42A GB1166542A GB559535A GB 559535 A GB559535 A GB 559535A GB 11665/42 A GB11665/42 A GB 11665/42A GB 1166542 A GB1166542 A GB 1166542A GB 559535 A GB559535 A GB 559535A
- Authority
- GB
- United Kingdom
- Prior art keywords
- circuit
- rectifiers
- frequency
- relation
- volume control
- 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
- 230000001105 regulatory effect Effects 0.000 abstract 1
Classifications
-
- 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
- H03D3/02—Demodulation of angle-, frequency- or phase- modulated oscillations by detecting phase difference between two signals obtained from input signal
- H03D3/06—Demodulation of angle-, frequency- or phase- modulated oscillations by detecting phase difference between two signals obtained from input signal by combining signals additively or in product demodulators
- H03D3/08—Demodulation of angle-, frequency- or phase- modulated oscillations by detecting phase difference between two signals obtained from input signal by combining signals additively or in product demodulators by means of diodes, e.g. Foster-Seeley discriminator
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G3/00—Gain control in amplifiers or frequency changers
- H03G3/20—Automatic control
- H03G3/22—Automatic control in amplifiers having discharge tubes
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Circuits Of Receivers In General (AREA)
Abstract
559,535. Frequency modulation ; automatic volume control. PHILCO RADIO & TELEVISION CORPORATION. Aug. 19, 1942, No. 11665. Convention date, Oct. 17, 1941. [Class 40 (v)] In a frequency-discriminating detector circuit for the reception of frequency-modulated waves, the load resistances of the rectifiers are connected in series-aiding relation for D.C. voltage so as to provide a voltage suitable for automatic volume control, and are connected in a reversed relation for providing audio output voltages. The circuit may be arranged for the alternative reception of ampli'ude-modulated or frequencymodulated waves without switching. The I.F. wave in circuit 9 is applied bv the coils 3, 4 in phase opposition to the rectifiers D1, D2 and in quadrature phase by the tuned circuit 5 loosely coupled to the circuit 9. The load resistance 1, 2 of the respective rectifiers are connected in seriesaiding relation by a high resistance 10, 20 so as to provide at AVC a direct or slowly-varying voltage for regulating the gain of the receiver. The resistances 1, 2 are connected in opposed relation by an audio-frequency condenser 8 so as to provide the audio output voltage across the two cathodes of the rectifiers. When the circuit is required to receive amplitude-modulated waves, a circuit tuned to a much lower I.F. than the circuit 9 is connected in series with that circuit, and is coupled to a secondary tuned circuit connected between the coil 4 and the condenser 8. The AM signal is rectified by the diode D2 and appears across the resistance 2, and may be taken off at the same terminals as the FM signal, Fig. 3 (not shown). Specifications 181,799, [Class 40 (v)], 489,094 and 559,967 are referred to.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US415465A US2330902A (en) | 1941-10-17 | 1941-10-17 | Detector and automatic volume control circuit for frequency-modulation receivers |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB559535A true GB559535A (en) | 1944-02-23 |
Family
ID=23645775
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB11665/42A Expired GB559535A (en) | 1941-10-17 | 1942-08-19 | Detector and automatic volume control circuit for frequency modulation receivers |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US2330902A (en) |
| GB (1) | GB559535A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE965854C (en) * | 1945-06-14 | 1957-06-27 | Rca Corp | Detector for frequency or phase modulated voltages |
| DE977658C (en) * | 1945-09-07 | 1968-01-25 | Rca Corp | Detector for phase angle modulated carrier frequency voltages |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2455450A (en) * | 1944-01-13 | 1948-12-07 | Zenith Radio Corp | Radio receiver noise suppression circuit |
| US2472301A (en) * | 1944-02-05 | 1949-06-07 | Rca Corp | Frequency modulated-amplitude modulated receiver |
| US2500505A (en) * | 1945-02-08 | 1950-03-14 | Bendix Aviat Corp | Automatic gain control system |
| US2501120A (en) * | 1945-04-26 | 1950-03-21 | Rca Corp | Frequency modulation receiver tuning aid |
| US2622146A (en) * | 1945-12-15 | 1952-12-16 | Rca Corp | Automatic frequency control circuit for television |
-
1941
- 1941-10-17 US US415465A patent/US2330902A/en not_active Expired - Lifetime
-
1942
- 1942-08-19 GB GB11665/42A patent/GB559535A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE965854C (en) * | 1945-06-14 | 1957-06-27 | Rca Corp | Detector for frequency or phase modulated voltages |
| DE977658C (en) * | 1945-09-07 | 1968-01-25 | Rca Corp | Detector for phase angle modulated carrier frequency voltages |
Also Published As
| Publication number | Publication date |
|---|---|
| US2330902A (en) | 1943-10-05 |
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