JPS55114040A - Muting circuit for fm radio receiver - Google Patents
Muting circuit for fm radio receiverInfo
- Publication number
- JPS55114040A JPS55114040A JP2120579A JP2120579A JPS55114040A JP S55114040 A JPS55114040 A JP S55114040A JP 2120579 A JP2120579 A JP 2120579A JP 2120579 A JP2120579 A JP 2120579A JP S55114040 A JPS55114040 A JP S55114040A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- signal
- electric field
- control signal
- output
- 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
Landscapes
- Noise Elimination (AREA)
Abstract
PURPOSE: To ravel out unnaturalness in terms of the sense of hearing by generating as a DC control signal to be supplied to a muting circuit a signal varying linearly with the intensity of an input electric field, and then by gradually attenuating an output signal from an output amplifier circuit nearly at the input electric field intensity for muting operation.
CONSTITUTION: An IF signal output is supplied from intermediate frequency amplifier circuit 1 to level detection circuit 5, and a DC control signal corresponding to the level of this IF signal output is outputted from circuit 5. The DC control signal from circuit 5, having a freely-fixed reference level, is supplied to level comparator 6, which allows an input signal of less than a reference level to which the input signal was compared, to make it possible to determine freely the intensity of an input electric field where muting operation is put into effect, and the DC control signal from this comparator 6 is supplied to muting circuit 4. According to the input electric field intensity, the gain of output circuit 3 is attenuated by the DC control signal, varying linearly with the input electric field intensity, from this circuit 4.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2120579A JPS55114040A (en) | 1979-02-23 | 1979-02-23 | Muting circuit for fm radio receiver |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2120579A JPS55114040A (en) | 1979-02-23 | 1979-02-23 | Muting circuit for fm radio receiver |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS55114040A true JPS55114040A (en) | 1980-09-03 |
Family
ID=12048476
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2120579A Pending JPS55114040A (en) | 1979-02-23 | 1979-02-23 | Muting circuit for fm radio receiver |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS55114040A (en) |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS52117011A (en) * | 1976-03-29 | 1977-10-01 | Hitachi Denshi Ltd | S/n improvement |
JPS539403A (en) * | 1976-07-14 | 1978-01-27 | Pioneer Electronic Corp | Fm stereophonic receiver |
JPS55831B2 (en) * | 1974-07-27 | 1980-01-10 |
-
1979
- 1979-02-23 JP JP2120579A patent/JPS55114040A/en active Pending
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS55831B2 (en) * | 1974-07-27 | 1980-01-10 | ||
JPS52117011A (en) * | 1976-03-29 | 1977-10-01 | Hitachi Denshi Ltd | S/n improvement |
JPS539403A (en) * | 1976-07-14 | 1978-01-27 | Pioneer Electronic Corp | Fm stereophonic receiver |
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