GB1129243A - Radio receiver control system - Google Patents

Radio receiver control system

Info

Publication number
GB1129243A
GB1129243A GB3070466A GB3070466A GB1129243A GB 1129243 A GB1129243 A GB 1129243A GB 3070466 A GB3070466 A GB 3070466A GB 3070466 A GB3070466 A GB 3070466A GB 1129243 A GB1129243 A GB 1129243A
Authority
GB
United Kingdom
Prior art keywords
frequency
control
register
oscillator
gating
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
GB3070466A
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to GB3070466A priority Critical patent/GB1129243A/en
Publication of GB1129243A publication Critical patent/GB1129243A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
    • H03L7/00—Automatic control of frequency or phase; Synchronisation
    • H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
    • H03L7/16—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop
    • H03L7/18—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop using a frequency divider or counter in the loop
    • H03L7/181—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop using a frequency divider or counter in the loop a numerical count result being used for locking the loop, the counter counting during fixed time intervals
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J7/00—Automatic frequency control; Automatic scanning over a band of frequencies
    • H03J7/02—Automatic frequency control
    • H03J7/04—Automatic frequency control where the frequency control is accomplished by varying the electrical characteristics of a non-mechanically adjustable element or where the nature of the frequency controlling element is not significant
    • H03J7/06—Automatic frequency control where the frequency control is accomplished by varying the electrical characteristics of a non-mechanically adjustable element or where the nature of the frequency controlling element is not significant using counters or frequency dividers
    • H03J7/065—Automatic frequency control where the frequency control is accomplished by varying the electrical characteristics of a non-mechanically adjustable element or where the nature of the frequency controlling element is not significant using counters or frequency dividers the counter or frequency divider being used in a phase locked loop

Landscapes

  • Channel Selection Circuits, Automatic Tuning Circuits (AREA)

Abstract

1,129,243. Automatic frequency control systems; superheterodyne circuits. L. ILLING- WORTH. 18 Aug., 1967 [8 July, 1966], No. 30704/66. Headings H3A and H3Q. The frequency of the second local oscillator 15 of a double superheterodyne receiver is controlled by gating its output into a counter 25 to provide a count proportional to its frequency, and comparing this count with a desired number stored in register 19 to derive an error signal used to control the frequency by switching in various values of inductance and capacitance or by changing parameters in a relaxation oscillator. In the radio receiver shown in Fig. 1 a desired frequency is inserted into the register 19 by means of a telephone dial 17 and may be corrected by a knob 20 which is a fine tuning control, and the stored number may be fed to a display 23. The first three digits of the stored number select the required filters which are used in R.F. amplifier 11 instead of tuned circuits, and also control the frequency derived from a standard frequency source 12 which is used to supply the first mixer 13. The last five digits in the register control the frequency of the second local oscillator, as explained above, and may (but need not) be fed to the adder unit 27 to control the initial frequency of the oscillator 15. The standard source 12 supplies signals to control the gating of counter 25, and may supply an auxiliary signal to detector 24, e.g. a carrier for a single side-band signal or a beat frequency to produce an audible tone.
GB3070466A 1966-07-08 1966-07-08 Radio receiver control system Expired GB1129243A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3070466A GB1129243A (en) 1966-07-08 1966-07-08 Radio receiver control system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3070466A GB1129243A (en) 1966-07-08 1966-07-08 Radio receiver control system

Publications (1)

Publication Number Publication Date
GB1129243A true GB1129243A (en) 1968-10-02

Family

ID=10311834

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3070466A Expired GB1129243A (en) 1966-07-08 1966-07-08 Radio receiver control system

Country Status (1)

Country Link
GB (1) GB1129243A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2473818A1 (en) * 1980-01-12 1981-07-17 Sony Corp DOUBLE SUPERHETERODYNE RECEIVER

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2473818A1 (en) * 1980-01-12 1981-07-17 Sony Corp DOUBLE SUPERHETERODYNE RECEIVER

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