GB745471A - Noise killer for frequency-modulated radio receivers - Google Patents
Noise killer for frequency-modulated radio receiversInfo
- Publication number
- GB745471A GB745471A GB24536/53A GB2453653A GB745471A GB 745471 A GB745471 A GB 745471A GB 24536/53 A GB24536/53 A GB 24536/53A GB 2453653 A GB2453653 A GB 2453653A GB 745471 A GB745471 A GB 745471A
- Authority
- GB
- United Kingdom
- Prior art keywords
- rectifier
- received
- signal
- noise
- receiver
- 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.)
- Expired
Links
- 230000000903 blocking effect Effects 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G3/00—Gain control in amplifiers or frequency changers
- H03G3/20—Automatic control
- H03G3/22—Automatic control in amplifiers having discharge tubes
- H03G3/26—Muting amplifier when no signal is present or when only weak signals are present, or caused by the presence of noise, e.g. squelch systems
- H03G3/28—Muting amplifier when no signal is present or when only weak signals are present, or caused by the presence of noise, e.g. squelch systems in frequency-modulation receivers ; in angle-modulation receivers
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G3/00—Gain control in amplifiers or frequency changers
- H03G3/20—Automatic control
- H03G3/30—Automatic control in amplifiers having semiconductor devices
- H03G3/34—Muting amplifier when no signal is present or when only weak signals are present, or caused by the presence of noise signals, e.g. squelch systems
- H03G3/344—Muting responsive to the amount of noise (noise squelch)
Landscapes
- Noise Elimination (AREA)
Abstract
745,471. Radio receiving, muting and limiting systems. STANDARD TELEPHONES & CABLES, Ltd. Sept. 4, 1953 (Nov. 15, 1952], No. 24536/53. Class 40 (5). In a receiver the demodulator 1 is connected to the output circuit 2 through a network, including a biased rectifier G1 normally non- conducting, but rendered conducting to short circuit the received demodulated signal, on excessive noise interference, by an auxiliary circuit comprising a filter 3 responsive to noise frequency components lying outside the signal frequency band, amplifier 4 and rectifier 5 which rectifies the noise components and applies an opposing bias to the rectifier G1 to short circuit it. Another biased rectifier G2 may be in series with the received signal channel normally blocking the signal in the absence of a received carrier, but rendered conducting on receipt of the carrier, e.g. by the bias received from the limiter 6 in the case of an F.M. receiver.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE745471X | 1952-11-15 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB745471A true GB745471A (en) | 1956-02-29 |
Family
ID=6648218
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB24536/53A Expired GB745471A (en) | 1952-11-15 | 1953-09-04 | Noise killer for frequency-modulated radio receivers |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB745471A (en) |
-
1953
- 1953-09-04 GB GB24536/53A patent/GB745471A/en not_active Expired
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