GB559535A - Detector and automatic volume control circuit for frequency modulation receivers - Google Patents

Detector and automatic volume control circuit for frequency modulation receivers

Info

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
Application number
GB11665/42A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Philco Radio and Television Corp
Original Assignee
Philco Radio and Television Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Philco Radio and Television Corp filed Critical Philco Radio and Television Corp
Publication of GB559535A publication Critical patent/GB559535A/en
Expired legal-status Critical Current

Links

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 without distortion of the input signal
    • H03G3/20—Automatic control
    • H03G3/22—Automatic control in amplifiers having discharge tubes

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.
GB11665/42A 1941-10-17 1942-08-19 Detector and automatic volume control circuit for frequency modulation receivers Expired GB559535A (en)

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)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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

Cited By (2)

* Cited by examiner, † Cited by third party
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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