CN201207641Y - Automatically channel selecting frequency modulating transmitting system and wireless transmission system - Google Patents
Automatically channel selecting frequency modulating transmitting system and wireless transmission system Download PDFInfo
- Publication number
- CN201207641Y CN201207641Y CNU2008200568433U CN200820056843U CN201207641Y CN 201207641 Y CN201207641 Y CN 201207641Y CN U2008200568433 U CNU2008200568433 U CN U2008200568433U CN 200820056843 U CN200820056843 U CN 200820056843U CN 201207641 Y CN201207641 Y CN 201207641Y
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- frequency
- transmitter
- register
- low noise
- power amplifier
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Abstract
The utility model discloses an automatic channel selection frequency modulation transmitting system, which comprises an FM transmitter, and the frequency modulation transmitter also includes a low noise radio frequency power amplifier, a frequency mixer, a band-pass filter, a signal energy detection circuit and a register; the FM transmitter includes a frequency comprehensive device; and the FM transmitter is connected with the low noise radio frequency power amplifier and the register, the frequency mixer is connected with the low noise radio frequency power amplifier, the band-pass filter and the frequency comprehensive device, and the signal energy detection circuit is connected with the band-pass filter and the register. The utility model can automatically detect an empty channel, and make the FM transmitter lock the frequency of the empty channel automatically, thereby avoiding the interference of common-frequency signals and near-frequency signals.
Description
Technical field
The utility model relates to a kind of frequency-modulated transmitter, relates in particular to a kind of automatic channel and selects fm transmitter system, and the utility model also relates to a kind of wireless transmitting system that uses above-mentioned fm transmitter system.
Background technology
The stereo fm transmit-receive technology is a kind of simple and effective stereo audio signal analogue radio transmissions method.Should comprise frequency-modulated transmitter and fremodyne in the complete transmission system of one cover, they exist with the autonomous device form usually; Except that radiofrequency signal, there is not the information exchange channel of any other form each other.Receiving system just must operate in the radio-frequency channel identical with emission system in order accurately to receive the radiofrequency signal that emission system sends.
In actual use, may have homogenous frequency signal or nearly signal frequently in the environment space, these signals will disturb effectively transmitted signal, thereby have a strong impact on the transmission quality of analog stereo audio signal.In order to reduce interference, existing equipment need increase by a receiving system, utilizes this receiving system to seek the enough little vacant channels of interference signal at available frequency band, and the artificially places emission system on the identical working channel then.
This method need manually be finished, and real-time is relatively poor, and is more loaded down with trivial details simultaneously.
The utility model content
Technical problem to be solved in the utility model is: a kind of fm transmitter system that can select send channel automatically is provided.
In addition, the utility model also provides a kind of wireless transmitting system that uses above-mentioned fm transmitter system.
For solving the problems of the technologies described above, the utility model adopts following technical scheme:
A kind of automatic channel is selected fm transmitter system, comprises the FM reflector, and described frequency-modulated transmitter also comprises low noise radio-frequency power amplifier, frequency mixer, band pass filter, signal energy testing circuit, register; Described FM reflector comprises frequency synthesizer; Described FM reflector connects low noise radio-frequency power amplifier, register, and described frequency mixer connects low noise radio-frequency power amplifier, band pass filter, frequency synthesizer, described signal energy testing circuit connecting band bandpass filter, register.
As a kind of preferred version of the present utility model, described low noise radio-frequency power amplifier is used for the space radiofrequency signal that receives is amplified; Described frequency mixer is used for the signal that receives is become intermediate-freuqncy signal; Described band pass filter is used for selective channel; Described signal energy testing circuit is used for determining the energy size of channel; Described register is used to store the energy size of the channel that described signal energy testing circuit detects; Described frequency synthesizer is used for and will the channel in whole effective frequency range be scanned.
A kind of wireless transmitting system comprises fremodyne, reaches above-mentioned automatic channel selection fm transmitter system.
The beneficial effects of the utility model are: the utility model can detect vacant channels automatically, and allows the FM reflector automatically become locked to the frequency of vacant channels, can avoid homogenous frequency signal and the nearly interference of signal frequently like this.
Description of drawings
Fig. 1 is the composition schematic diagram of the utility model frequency-modulated transmitter.
Embodiment
Describe preferred embodiment of the present utility model in detail below in conjunction with accompanying drawing.
See also Fig. 1, the utility model has disclosed a kind of automatic channel and has selected fm transmitter system, comprises FM reflector 1, low noise radio-frequency power amplifier 2, frequency mixer 3, band pass filter 4, signal energy testing circuit 5, register 6; Described FM reflector 1 comprises frequency synthesizer 11; Described FM reflector 1 connects low noise radio-frequency power amplifier 3, register 6, and described frequency mixer 3 connects low noise radio-frequency power amplifier 2, band pass filter 4, frequency synthesizer 11, described signal energy testing circuit 5 connecting band bandpass filters 4, register 6.
Described low noise radio-frequency power amplifier 2 is used for the space radiofrequency signal that receives is amplified; Described frequency mixer 3 is used for the signal that receives is become intermediate-freuqncy signal; Described band pass filter 4 is used for selective channel; Described signal energy testing circuit 5 is used for determining the energy size of channel; Described register 6 is used to store the energy size of the channel that described signal energy testing circuit 5 detects; Described frequency synthesizer 11 is used for and will the channel in whole effective frequency range be scanned.
Below introduce operation principle of the present utility model: above-mentioned automatic channel is selected semiduplex system of fm transmitter system.The space radiofrequency signal that 2 pairs of low noise radio-frequency power amplifiers receive is amplified, and changes to intermediate-freuqncy signal by frequency mixer 3 then, carries out channel by band pass filter 4 again and selects, and determines the energy size of channel at last with signal energy testing circuit 5.Frequency synthesizer 11 will scan the channel in whole effective frequency range, and the energy datum of all channels just can be stored in the register 6 like this.Behind the end of scan, FM reflector 1 will extract corresponding data from register 6, and it can be worked on the low channel that disturbs automatically.
The complete wireless transmitting system of one cover should comprise a fremodyne, reach above-mentioned automatic channel selection fm transmitter system.
The utility model can detect vacant channels automatically, and allows the FM reflector automatically become locked to the frequency of vacant channels, can avoid homogenous frequency signal and the nearly interference of signal frequently like this.
Above embodiment is the unrestricted the technical solution of the utility model in order to explanation only.Any modification or partial replacement that does not break away from the utility model spirit and scope all should be encompassed in the middle of the claim scope of the present utility model.
Claims (2)
1, a kind of automatic channel is selected fm transmitter system, comprises the FM reflector, it is characterized in that described frequency-modulated transmitter also comprises low noise radio-frequency power amplifier, frequency mixer, band pass filter, signal energy testing circuit, register; Described FM reflector comprises frequency synthesizer;
Described FM reflector connects low noise radio-frequency power amplifier, register, and described frequency mixer connects low noise radio-frequency power amplifier, band pass filter, frequency synthesizer, described signal energy testing circuit connecting band bandpass filter, register.
2, a kind of wireless transmitting system is characterized in that, comprises automatic channel selection fm transmitter system as claimed in claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200568433U CN201207641Y (en) | 2008-04-01 | 2008-04-01 | Automatically channel selecting frequency modulating transmitting system and wireless transmission system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200568433U CN201207641Y (en) | 2008-04-01 | 2008-04-01 | Automatically channel selecting frequency modulating transmitting system and wireless transmission system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201207641Y true CN201207641Y (en) | 2009-03-11 |
Family
ID=40466697
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008200568433U Expired - Lifetime CN201207641Y (en) | 2008-04-01 | 2008-04-01 | Automatically channel selecting frequency modulating transmitting system and wireless transmission system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201207641Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101567702A (en) * | 2009-05-15 | 2009-10-28 | 深圳创维－Rgb电子有限公司 | Self-adaptive vehicle FM transmitting device and implementation method thereof |
| CN103795426A (en) * | 2014-01-10 | 2014-05-14 | 南昌大学 | High-frequency software radio transmission system |
-
2008
- 2008-04-01 CN CNU2008200568433U patent/CN201207641Y/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101567702A (en) * | 2009-05-15 | 2009-10-28 | 深圳创维－Rgb电子有限公司 | Self-adaptive vehicle FM transmitting device and implementation method thereof |
| CN103795426A (en) * | 2014-01-10 | 2014-05-14 | 南昌大学 | High-frequency software radio transmission system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: HAOWEI INTERNATIONAL HOLDING CO., LTD. Free format text: FORMER OWNER: ACCEL SEMICONDUCTOR (SHANGHAI) CORP. Effective date: 20100906 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| COR | Change of bibliographic data |
Free format text: CORRECT: ADDRESS; FROM: 201203 1/F, MAIN BUILDING, NO.149, CHUNXIAO ROAD, ZHANGJIANG HIGH-TECH. PARK, PUDONG NEW DISTRICT, SHANGHAI TO: MAILBOX 709GT, ZEFA BUILDING, MALI STREET, GRAND CAYMAN, CAYMAN ISLANDS, WEST INDIES, ENGLAND |
|
| TR01 | Transfer of patent right |
Effective date of registration: 20100906 Address after: Box office 709GT, grand Marie Island, Grand Cayman, Cayman Islands, West Indies, UK Patentee after: Howay International Holdings Ltd. Address before: 201203 Shanghai Zhangjiang High Tech Park of Pudong New Area Chunxiao Road No. 149 Building 1 floor Patentee before: Accel Semiconductor (Shanghai) Corp. |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20090311 |