JPS5726921A - Receiver - Google Patents
ReceiverInfo
- Publication number
- JPS5726921A JPS5726921A JP10179380A JP10179380A JPS5726921A JP S5726921 A JPS5726921 A JP S5726921A JP 10179380 A JP10179380 A JP 10179380A JP 10179380 A JP10179380 A JP 10179380A JP S5726921 A JPS5726921 A JP S5726921A
- Authority
- JP
- Japan
- Prior art keywords
- frequency
- circuit
- tuning
- held
- high speed
- 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.)
- Pending
Links
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
- H03J1/00—Details of adjusting, driving, indicating, or mechanical control arrangements for resonant circuits in general
- H03J1/0008—Details of adjusting, driving, indicating, or mechanical control arrangements for resonant circuits in general using a central processing unit, e.g. a microprocessor
- H03J1/0041—Details of adjusting, driving, indicating, or mechanical control arrangements for resonant circuits in general using a central processing unit, e.g. a microprocessor for frequency synthesis with counters or frequency dividers
- H03J1/005—Details of adjusting, driving, indicating, or mechanical control arrangements for resonant circuits in general using a central processing unit, e.g. a microprocessor for frequency synthesis with counters or frequency dividers in a loop
-
- 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
- H03J5/0281—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 the digital values being held in an auxiliary non erasable memory
Landscapes
- Engineering & Computer Science (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Superheterodyne Receivers (AREA)
- Channel Selection Circuits, Automatic Tuning Circuits (AREA)
Abstract
PURPOSE:To enable high speed frequency setting and stable holding of tuning state, by changing the transfer characteristics of a loop filter according to the operation mode. CONSTITUTION:In automatic frequency scanning mode, a signal S5 outputted from a control circuit 16 is held at ''H'', then the time constant of an integration circuit 30 is small and the oscillating frequency of a local oscillator 4 is increased in step and high speed. If the reception frequency is put in the center area of an occupied frequency band of a broadcast station, the output of a window comparator 15 is at ''H'' and the time constant of the circuit 30 is set larger. Even if the output voltage of a tuning detection circuit 13 is changed, the change in the charging voltage Vc is slow and the tuning voltage can very stably be held.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10179380A JPS5726921A (en) | 1980-07-24 | 1980-07-24 | Receiver |
US06/227,535 US4365349A (en) | 1980-02-01 | 1981-01-22 | Radio receiver having phase locked loop and automatic frequency control loop for stably maintaining local oscillator frequency of voltage-controlled local oscillator |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10179380A JPS5726921A (en) | 1980-07-24 | 1980-07-24 | Receiver |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5726921A true JPS5726921A (en) | 1982-02-13 |
Family
ID=14310032
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP10179380A Pending JPS5726921A (en) | 1980-02-01 | 1980-07-24 | Receiver |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5726921A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS63194409A (en) * | 1987-02-09 | 1988-08-11 | Matsushita Electric Ind Co Ltd | Channel selection device |
JPS63194410A (en) * | 1987-02-09 | 1988-08-11 | Matsushita Electric Ind Co Ltd | Channel selection device |
-
1980
- 1980-07-24 JP JP10179380A patent/JPS5726921A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS63194409A (en) * | 1987-02-09 | 1988-08-11 | Matsushita Electric Ind Co Ltd | Channel selection device |
JPS63194410A (en) * | 1987-02-09 | 1988-08-11 | Matsushita Electric Ind Co Ltd | Channel selection device |
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