JPS55125732A - Digital tuning system of synthesizer system - Google Patents
Digital tuning system of synthesizer systemInfo
- Publication number
- JPS55125732A JPS55125732A JP3229579A JP3229579A JPS55125732A JP S55125732 A JPS55125732 A JP S55125732A JP 3229579 A JP3229579 A JP 3229579A JP 3229579 A JP3229579 A JP 3229579A JP S55125732 A JPS55125732 A JP S55125732A
- Authority
- JP
- Japan
- Prior art keywords
- time constant
- muting
- changed
- signal
- lpf5
- 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
Abstract
PURPOSE:To make high speed the automatic channel selection and high S/N for the compatibility, so that the time constant of LPF connected to the phase comparator output can be selected or made variable. CONSTITUTION:When the frequency is changed with automatic channel selection, since muting is made to the radio audio output, S/N is not taken as any problem, and at normal reception, high speed response of PLL is not entirely taken as any problem since the frequency is not required to be changed and the time constant of LPF of PLL can be greatly changed depending on the relation before and after. That is, the LPF5 at the output side of the phase comparator 4 is greatly changed for the time constant with the signal line (a) from the controller 8. The controller 8 counts up the counter stored up to now with the instruction from the keyboard 9, the result is delivered to the programmable divider 3, and the audio sound of radio set is stopped by giving muting signal to the muting circuit 11 at the same time, signal (a) is delivered to LPF5 and the time constant can sufficiently be set shorter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3229579A JPS55125732A (en) | 1979-03-22 | 1979-03-22 | Digital tuning system of synthesizer system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3229579A JPS55125732A (en) | 1979-03-22 | 1979-03-22 | Digital tuning system of synthesizer system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS55125732A true JPS55125732A (en) | 1980-09-27 |
Family
ID=12354956
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3229579A Pending JPS55125732A (en) | 1979-03-22 | 1979-03-22 | Digital tuning system of synthesizer system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS55125732A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5946051U (en) * | 1982-09-17 | 1984-03-27 | クラリオン株式会社 | auto tuning radio receiver |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS50148009A (en) * | 1974-05-20 | 1975-11-27 |
-
1979
- 1979-03-22 JP JP3229579A patent/JPS55125732A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS50148009A (en) * | 1974-05-20 | 1975-11-27 |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5946051U (en) * | 1982-09-17 | 1984-03-27 | クラリオン株式会社 | auto tuning radio receiver |
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