CA1095194A - Phase locked loop television tuning system - Google Patents

Phase locked loop television tuning system

Info

Publication number
CA1095194A
CA1095194A CA283,904A CA283904A CA1095194A CA 1095194 A CA1095194 A CA 1095194A CA 283904 A CA283904 A CA 283904A CA 1095194 A CA1095194 A CA 1095194A
Authority
CA
Canada
Prior art keywords
frequency
signal
reference frequency
local oscillator
tuning system
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
CA283,904A
Other languages
English (en)
French (fr)
Inventor
John G.N. Henderson
Charles M. Wine
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.)
RCA Corp
Original Assignee
RCA 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
Priority claimed from US05/779,126 external-priority patent/US4106059A/en
Application filed by RCA Corp filed Critical RCA Corp
Application granted granted Critical
Publication of CA1095194A publication Critical patent/CA1095194A/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
    • H03L7/183—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 time difference being used for locking the loop, the counter counting between fixed numbers or the frequency divider dividing by a fixed number
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J5/00—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner
    • H03J5/02—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner with variable tuning element having a number of predetermined settings and adjustable to a desired one of these settings
    • H03J5/0245—Discontinuous tuning using an electrical variable impedance element, e.g. a voltage variable reactive diode, in which no corresponding analogue value either exists or is preset, i.e. the tuning information is only available in a digital form
    • H03J5/0272—Discontinuous tuning using an electrical variable impedance element, e.g. a voltage variable reactive diode, in which no corresponding analogue value either exists or is preset, i.e. the tuning information is only available in a digital form the digital values being used to preset a counter or a frequency divider in a phase locked loop, e.g. frequency synthesizer

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Superheterodyne Receivers (AREA)
  • Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
  • Television Receiver Circuits (AREA)
CA283,904A 1976-08-30 1977-08-02 Phase locked loop television tuning system Expired CA1095194A (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US71845576A 1976-08-30 1976-08-30
US05/779,126 US4106059A (en) 1976-08-30 1977-03-18 Phase locked loop television tuning system
US779,126 1977-03-18
US718,455 1991-06-20

Publications (1)

Publication Number Publication Date
CA1095194A true CA1095194A (en) 1981-02-03

Family

ID=27109902

Family Applications (1)

Application Number Title Priority Date Filing Date
CA283,904A Expired CA1095194A (en) 1976-08-30 1977-08-02 Phase locked loop television tuning system

Country Status (5)

Country Link
JP (1) JPS5923516B2 (Direct)
CA (1) CA1095194A (Direct)
DE (1) DE2738905C3 (Direct)
FR (1) FR2363231A1 (Direct)
GB (1) GB1586368A (Direct)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0787332B2 (ja) * 1986-07-18 1995-09-20 株式会社東芝 フイルタ回路の時定数自動調整回路

Also Published As

Publication number Publication date
JPS5923516B2 (ja) 1984-06-02
DE2738905A1 (de) 1978-03-09
DE2738905C3 (de) 1980-09-18
DE2738905B2 (de) 1980-01-31
FR2363231A1 (fr) 1978-03-24
JPS5330220A (en) 1978-03-22
GB1586368A (en) 1981-03-18
FR2363231B1 (Direct) 1982-01-29

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Legal Events

Date Code Title Description
MKEX Expiry
MKEX Expiry

Effective date: 19980203