CN2938578Y - Frequency-modulation radio broadcast receiver-amplifier of controlling amplifying switch by dummy audio signal - Google Patents
Frequency-modulation radio broadcast receiver-amplifier of controlling amplifying switch by dummy audio signal Download PDFInfo
- Publication number
- CN2938578Y CN2938578Y CN 200620021547 CN200620021547U CN2938578Y CN 2938578 Y CN2938578 Y CN 2938578Y CN 200620021547 CN200620021547 CN 200620021547 CN 200620021547 U CN200620021547 U CN 200620021547U CN 2938578 Y CN2938578 Y CN 2938578Y
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- CN
- China
- Prior art keywords
- amplifier
- circuit
- audio signal
- signal
- dumb sound
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- 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 - Fee Related
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Abstract
The utility model relates to a FM radio broadcast receiver-amplifier using a dummy audio signal to control the sound amplification switch. An external input terminal (1) sends the RF signal to a receiving circuit (2), one way of the audio signal of the frequency discrimination output of the receiving circuit (2) is supplied to the power amplifier and the loudspeaker connected via an output line (4), and the other way is connected to a mute detection circuit (3). When detecting the same dummy audio signal as that preset in this unit, the mute detection circuit (3) exports a voltage to the switching circuit of a main relay (5). The utility model is so designed that the broadcast receiver-amplifier is provided not only with a receiving circuit and a power amplification circuit, but also with a mute 50-300HZ detector and a power amplification power supply or an audio signal control circuit. Only when a signal transmitted by the special transmitter that is identical to the carrier frequency and dummy audio values preset in this unit can this unit amplifies the sound properly. Since an ordinary interfering signal does not contain a certain dummy audio signal, the receiver-amplifier will not start up, avoiding public interference.
Description
Under the field: the utility model relates to a kind of with dumb sound the amplify FM radio amplifier of switch of signal controlling frequently.
Background technology: original FM broadcasting amplifier is generally by detecting having or not of carrier frequency, by the power supply of squelch circuit control power amplifier or the switch of audio signal, realize the purpose of wireless remote control broadcasting, during daily standby, if occur with radiofrequency signal interference frequently, squelch circuit easily opens by mistake and opens, and the amplifier public address causes the generation of the incident of disturbing residents.
Summary of the invention: the purpose of this utility model provide a kind of avoid that noise produces with dumb sound the amplify FM radio amplifier of switch of signal controlling frequently.The purpose of this utility model realizes by following structure: the utility model is a kind of with dumb sound the amplify FM radio amplifier of switch of signal controlling frequently, external input is supplied with receiving circuit with radiofrequency signal, the audio signal one tunnel of receiving circuit frequency discrimination output supplies to connect the power amplifier loudspeaker through outlet line, another road connects the dumb sound testing circuit, the dumb sound testing circuit detect frequently identical with the default dumb sound of this machine after, output voltage is to the switching circuit of main relay.The utility model design principle is that the broadcasting amplifier is except that being provided with receiving circuit and power amplifier, also be provided with dumb sound 50-300HZ detection and amplifier power supply or audio signal control circuit in addition, during the signal frequently all identical of only receiving dedicated transmitter emission, could normally amplify with the default carrier frequency of this machine and dumb sound.Owing to do not inject specific dumb sound signal frequently in the daily interference signal of receiving, so can not starting shooting, amplifier do not amplify, avoided the generation of the incident that disturbs residents.
Description of drawings:
Fig. 1 is the utility model circuit working schematic diagram
Embodiment:
The utility model as shown in Figure 1 is a kind of with dumb sound the amplify FM radio amplifier of switch of signal controlling frequently, external input 1 is supplied with receiving circuit 2 with radiofrequency signal, the audio signal one tunnel of receiving circuit 2 frequency discriminations output supplies to connect the power amplifier loudspeaker through outlet line 4, another road connects dumb sound testing circuit 3, dumb sound testing circuit 3 detect frequently identical with the default dumb sound of this machine after, output voltage to the switching circuit of main relay 5, thereby realize by dumb sound frequently signal controlling automatically.The model that receiving circuit 2 adopts is: MC3357 or MC3361, dumb sound testing circuit 3 is the CMX808A integrated circuit.
Claims (2)
1, a kind of with dumb sound the amplify FM radio amplifier of switch of signal controlling frequently, it is characterized in that: external input (1) is supplied with receiving circuit (2) with radiofrequency signal, the audio signal one tunnel of receiving circuit (2) frequency discrimination output supplies to connect the power amplifier loudspeaker through outlet line (4), another road connects dumb sound testing circuit (3), dumb sound testing circuit (3) detect frequently identical with the default dumb sound of this machine after, output voltage is to the switching circuit of main relay (5).
2, according to claim 1 a kind of with dumb sound the amplify FM radio amplifier of switch of signal controlling frequently, it is characterized in that: the model that receiving circuit (2) adopts is: MC3357 or MC3361, dumb sound testing circuit (3) is the CMX808A integrated circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620021547 CN2938578Y (en) | 2006-08-29 | 2006-08-29 | Frequency-modulation radio broadcast receiver-amplifier of controlling amplifying switch by dummy audio signal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620021547 CN2938578Y (en) | 2006-08-29 | 2006-08-29 | Frequency-modulation radio broadcast receiver-amplifier of controlling amplifying switch by dummy audio signal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2938578Y true CN2938578Y (en) | 2007-08-22 |
Family
ID=38362607
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200620021547 Expired - Fee Related CN2938578Y (en) | 2006-08-29 | 2006-08-29 | Frequency-modulation radio broadcast receiver-amplifier of controlling amplifying switch by dummy audio signal |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2938578Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113747308A (en) * | 2021-08-25 | 2021-12-03 | 深圳朗特智能控制股份有限公司 | Broadcasting method of sweeping robot, sweeping robot and storage medium |
-
2006
- 2006-08-29 CN CN 200620021547 patent/CN2938578Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113747308A (en) * | 2021-08-25 | 2021-12-03 | 深圳朗特智能控制股份有限公司 | Broadcasting method of sweeping robot, sweeping robot and storage medium |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |