JPS57168530A - Noise suppressing system - Google Patents
Noise suppressing systemInfo
- Publication number
- JPS57168530A JPS57168530A JP5314681A JP5314681A JPS57168530A JP S57168530 A JPS57168530 A JP S57168530A JP 5314681 A JP5314681 A JP 5314681A JP 5314681 A JP5314681 A JP 5314681A JP S57168530 A JPS57168530 A JP S57168530A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- intermediate frequency
- frequency band
- false
- supplied
- 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
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Noise Elimination (AREA)
Abstract
PURPOSE:To suppress the noise caused in the no-signal time in any state with simple constitution and in a quick and accurate way, by always transmitting the false signal at the outside of an intermediate frequency band to an intermediate frequency amplifier to control an amplitude limiter. CONSTITUTION:The false signal at the outside of an intermediate frequency band which is transmitted from an intermediate frequency band signal generator 9 is transmitted at all times to an intermediate frequency amplifier 2 via an attenuator 8. When a desired intermediate frequency signal is not supplied, the gain of an amplitude limiter is controlled by the false signal to transmit no noise in the no-signal time. When a desired intermediate frequency signal is supplied, the desired signal that is selected and amplified through an intermediate frequency band pass filter 1 and the amplifier 2 is supplied to the limiter 3 along with the above-mentioned false signal. Then the modulated signal of a desired wave is delivered thruogh a frequency discriminator 4 when the level of the desired intermediate frequency signal exceeds the level of the false signal.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP5314681A JPS57168530A (en) | 1981-04-10 | 1981-04-10 | Noise suppressing system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP5314681A JPS57168530A (en) | 1981-04-10 | 1981-04-10 | Noise suppressing system |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS57168530A true JPS57168530A (en) | 1982-10-16 |
Family
ID=12934682
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP5314681A Pending JPS57168530A (en) | 1981-04-10 | 1981-04-10 | Noise suppressing system |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS57168530A (en) |
-
1981
- 1981-04-10 JP JP5314681A patent/JPS57168530A/en active Pending
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