GB1586368A - Phase locked loop television tuning system - Google Patents

Phase locked loop television tuning system Download PDF

Info

Publication number
GB1586368A
GB1586368A GB3570477A GB3570477A GB1586368A GB 1586368 A GB1586368 A GB 1586368A GB 3570477 A GB3570477 A GB 3570477A GB 3570477 A GB3570477 A GB 3570477A GB 1586368 A GB1586368 A GB 1586368A
Authority
GB
United Kingdom
Prior art keywords
frequency
signal
tuning system
local oscillator
reference frequency
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
GB3570477A
Other languages
English (en)
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
Publication of GB1586368A publication Critical patent/GB1586368A/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)
GB3570477A 1976-08-30 1977-08-25 Phase locked loop television tuning system Expired GB1586368A (en)

Applications Claiming Priority (2)

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

Publications (1)

Publication Number Publication Date
GB1586368A true GB1586368A (en) 1981-03-18

Family

ID=27109902

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3570477A Expired GB1586368A (en) 1976-08-30 1977-08-25 Phase locked loop television tuning system

Country Status (5)

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

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2194402A (en) * 1986-07-18 1988-03-02 Toshiba Kk Automatic adjustment circuit for a filter

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2194402A (en) * 1986-07-18 1988-03-02 Toshiba Kk Automatic adjustment circuit for a filter
US4818903A (en) * 1986-07-18 1989-04-04 Kabushiki Kaisha Toshiba Time constant automatic adjustment circuit for a filter circuit
GB2194402B (en) * 1986-07-18 1991-03-06 Toshiba Kk Time constant automatic adjustment circuit for a filter circuit

Also Published As

Publication number Publication date
FR2363231B1 (enrdf_load_stackoverflow) 1982-01-29
DE2738905A1 (de) 1978-03-09
JPS5923516B2 (ja) 1984-06-02
CA1095194A (en) 1981-02-03
DE2738905C3 (de) 1980-09-18
JPS5330220A (en) 1978-03-22
FR2363231A1 (fr) 1978-03-24
DE2738905B2 (de) 1980-01-31

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee