JPS5769935A - Receiver - Google Patents
ReceiverInfo
- Publication number
- JPS5769935A JPS5769935A JP14716880A JP14716880A JPS5769935A JP S5769935 A JPS5769935 A JP S5769935A JP 14716880 A JP14716880 A JP 14716880A JP 14716880 A JP14716880 A JP 14716880A JP S5769935 A JPS5769935 A JP S5769935A
- Authority
- JP
- Japan
- Prior art keywords
- loop
- filter
- control section
- constant
- muting
- 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
- 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)
- Noise Elimination (AREA)
- Channel Selection Circuits, Automatic Tuning Circuits (AREA)
Abstract
PURPOSE:To prevent the loop disturbance, by restoring the said loop filter constant aftr the stabilization of a PLL loop, through the voice muting at the switchig of station and increased gain of high frequency constant of the PLL filter. CONSTITUTION:A signal from a tuner 2 is applied to a control section 4 via a level discriminating circuit 3. A PLL synthesizer 10 consists of a phase comparator 7, a loop filter 8 and a local oscillator 9. On the ohter hand, tuning data is stored in a memory device 5 as frequency dividing data and transferred to a present data area 6 by the control section 4 and applied to a phase comparison section 7 as the frequency division data. At the switching of station, a muting circuit 11 is operated with the control section 4, the filter constant of the loop filter 8 is switched, the muting is released after loop stabilization, the filter constant is restored, and quick station switching can be made without loop disturbance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14716880A JPS5769935A (en) | 1980-10-20 | 1980-10-20 | Receiver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14716880A JPS5769935A (en) | 1980-10-20 | 1980-10-20 | Receiver |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5769935A true JPS5769935A (en) | 1982-04-30 |
Family
ID=15424115
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14716880A Pending JPS5769935A (en) | 1980-10-20 | 1980-10-20 | Receiver |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5769935A (en) |
-
1980
- 1980-10-20 JP JP14716880A patent/JPS5769935A/en active Pending
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