CN204349984U - The true diversity receiver of wireless microphone - Google Patents
The true diversity receiver of wireless microphone Download PDFInfo
- Publication number
- CN204349984U CN204349984U CN201420732368.2U CN201420732368U CN204349984U CN 204349984 U CN204349984 U CN 204349984U CN 201420732368 U CN201420732368 U CN 201420732368U CN 204349984 U CN204349984 U CN 204349984U
- Authority
- CN
- China
- Prior art keywords
- intermediate frequency
- module
- unit
- amplifies
- frequency
- 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.)
- Active
Links
Landscapes
- Radio Transmission System (AREA)
Abstract
The utility model relates to the true diversity receiver of a kind of wireless microphone, comprising: audio intensity selects module, control module, at least one group of radio-frequency (RF) receiving circuit, and at least one group of intermediate frequency amplifies demodulator circuit; Often organize in radio-frequency (RF) receiving circuit and comprise at least two identical Receiver Modules, often organize intermediate frequency and amplify in demodulator circuit and comprise at least two identical intermediate frequencies and amplify demodulation module; The output of described Receiver Module connects the input that described intermediate frequency amplifies demodulation module one to one.Use two-way receiving circuit can eliminate by multi-path transmission because of " signal interruption " phenomenon that phase place is cancelled out each other caused.Two antennas receive the signal of same wireless microphone respectively, by internal circuit choice for use comparatively Qiang mono-road signal.This mode significantly can be eliminated and receive dead band, avoids dumb sound or produces dead point noise.
Description
[technical field]
The utility model relates to electronic technology field, is specifically related to the true diversity receiver of a kind of wireless microphone.
[background technology]
The wireless microphone major part used in the market is a transmitting antenna, receiver reception antenna, this reception cannot eliminate wireless microphone in use multi-path transmission and " signal interruption " phenomenon causing phase place to cancel out each other produced, because the output of the transmitting set of microphone is to surrounding radiation, and reflect on various different interface, indoor and return, therefore multi-path transmission this " signal interruption " phenomenon is more common when indoor, if when receiver audio output stays open state, can hear of short duration fizz, ticktack, bang and together with other is mixed in audio signal, the direct ballistic work playback box of serious meeting causes the damage of equipment.
[summary of the invention]
In view of this, the utility model provides a kind of wireless microphone true diversity receiver.
The utility model adopts following technical scheme, and the true diversity receiver of structure wireless microphone, comprising: audio intensity selects module, control module, at least one group of radio-frequency (RF) receiving circuit, and at least one group of intermediate frequency amplifies demodulator circuit; Often organize in radio-frequency (RF) receiving circuit and comprise at least two identical Receiver Modules, often organize intermediate frequency and amplify in demodulator circuit and comprise at least two identical intermediate frequencies and amplify demodulation module; The output of described Receiver Module connects the input that described intermediate frequency amplifies demodulation module one to one;
Described Receiver Module, for receiving the radiofrequency signal in the multiple path of wireless microphone and exporting to described intermediate frequency amplification demodulation module after mixing amplification;
Described intermediate frequency amplifies demodulation module, for amplify that described Receiver Module exports intermediate-freuqncy signal and demodulate audio signal and select module and high frequency identification signal to control module to audio intensity;
Described audio intensity selects module, amplifies the stronger audio signal of demodulation module output intensity export for selecting described intermediate frequency;
Described control module, more described identical intermediate frequency amplifies the high frequency identification signal that demodulation module exports, and according to the strength degree of two-way high frequency identification signal, controls the selection function that audio intensity selects module, to realize the output compared with Qiang mono-tunnel audio signal.
Preferably, it comprises one group of high pitch radio-frequency (RF) receiving circuit and one group of bass radio-frequency (RF) receiving circuit, and two groups of intermediate frequencies amplify demodulator circuit.
Preferably, described high pitch and/or bass radio-frequency (RF) receiving circuit include the first Receiver Module and the second Receiver Module, and the first Receiver Module comprises the first antenna, the first VCO amplifying unit, the first phase locked-loop unit; Second Receiver Module comprises the second antenna, the second VCO amplifying unit; First antenna and the second antenna receive the radiofrequency signal of wireless microphone transmitting through filtering with after amplifying, export to the first VCO amplifying unit and the second mixing of VCO amplifying unit and amplification respectively, the first phase locked-loop unit gives the first VCO amplifying unit and the second VCO amplifying unit for generation of the carrier signal of phase stabilization.
Preferably, described intermediate frequency amplification demodulator circuit comprises the first intermediate frequency amplification demodulation module and the second intermediate frequency amplification demodulation module; Described first intermediate frequency amplifies demodulation module, comprises the first intermediate frequency unit and the second intermediate frequency unit, and the first intermediate frequency amplifies demodulating unit; Described second intermediate frequency amplifies demodulation module, comprises the 3rd intermediate frequency unit and the 4th intermediate frequency unit, and the second intermediate frequency amplifies demodulating unit; Described first intermediate frequency unit and the 3rd intermediate frequency unit, described second intermediate frequency unit and the 4th intermediate frequency unit is exported to respectively after high frequency radio signals for exporting described Receiver Module carries out filtering and mixing, then after described second intermediate frequency unit and the 4th intermediate frequency unit filtering and mixing, export to described first intermediate frequency respectively amplify demodulating unit and the second intermediate frequency amplification demodulating unit, described first intermediate frequency amplifies demodulating unit and the second intermediate frequency amplifies demodulating unit for amplifying and high frequency radio signals described in demodulation.
Advantageous Effects of the present utility model is:
1. use two-way receiving circuit can eliminate by multi-path transmission because of " signal interruption " phenomenon that phase place is cancelled out each other caused.Two antennas receive the signal of same wireless microphone respectively, by internal circuit choice for use comparatively Qiang mono-road signal.This mode significantly can be eliminated and receive dead band, avoids dumb sound or produces dead point noise.
2. adopt the receiving circuit of many group different frequencies, and the audible spectrum of wireless microphone different frequency is often received in group containing at least two identical receiving circuits, the transmitter of two of wireless microphone different frequencies can be made simultaneously to use the true diversity receiver of wireless microphone, export the audio signal close to primary sound.
[accompanying drawing explanation]
Fig. 1 wireless microphone non-diversity reception of the prior art schematic diagram;
Wireless microphone in Fig. 2 embodiment one true diversity receiver circuit composition frame chart;
Wireless microphone in Fig. 3 embodiment one true diversity receiver first VCO amplifying unit circuit theory diagrams;
Wireless microphone in Fig. 4 embodiment one true diversity receiver first phase locked-loop unit figure;
Wireless microphone in Fig. 5 embodiment one true diversity receiver second VCO amplifying unit circuit theory diagrams;
Wireless microphone in Fig. 6 embodiment one true diversity receiver first intermediate frequency amplifies demodulation module circuit theory diagrams;
Wireless microphone in Fig. 7 embodiment one true diversity receiver second intermediate frequency amplifies demodulation module circuit theory diagrams;
The true diversity receiver audio intensity of wireless microphone in Fig. 8 embodiment one selects modular circuit schematic diagram;
Wireless microphone in Fig. 9 embodiment one true diversity receiver dio Output Modules circuit theory diagrams;
Wireless microphone in Figure 10 embodiment two true diversity receiver circuit composition frame chart.
[embodiment]
In order to make the technical scheme of this patent and technique effect clearly, be described in detail below in conjunction with the embodiment of drawings and Examples to this patent.
Embodiment one:
As Fig. 1, the true diversity receiver of the wireless microphone in the present embodiment comprises the first Receiver Module, the second Receiver Module, and the first intermediate frequency amplifies demodulation module, and the second intermediate frequency amplifies demodulation module, and audio intensity selects module, dio Output Modules, control module.
First Receiver Module comprises the first antenna, the first VCO amplifying unit, the first phase locked-loop unit; The radiofrequency signal that first antenna is launched for receiving wireless microphone, radiofrequency signal exports to the first intermediate frequency amplification module after metal-oxide-semiconductor M1 and M2 amplifies after the first VCO amplifying unit amplification mixing, and the circuit theory of the first VCO amplifying unit is as Fig. 3.First phase locked-loop unit gives the first VCO amplifying unit and following second VCO amplifying unit for generation of the carrier signal of phase stabilization, and it adopts model to be the typical application circuit that MB15E03 is formed, and circuit theory is as Fig. 4.
Second Receiver Module comprises the second antenna, the second VCO amplifying unit; Second antenna is for receiving the radiofrequency signal of wireless microphone towards another one outlet openings, and radiofrequency signal exports to the second intermediate frequency amplification module after metal-oxide-semiconductor M5 and M6 amplifies after the second VCO amplifying unit amplification mixing, and circuit theory is as Fig. 5.
As can be seen from Fig. 3 to Fig. 5, the first antenna is identical with the electrical characteristic of the second antenna, and the first Receiver Module is also identical with the circuit of the second Receiver Module, and two modules share the carrier signal that the first phase-locked loop module exports.Second Receiver Module also can not share the first phase-locked loop module of the first Receiver Module, configures phase-locked loop module separately.
First intermediate frequency amplifies demodulation module, for amplify that the first Receiver Module exports high-frequency signal and demodulate audio signal and select module and high frequency identification signal to control module to audio intensity; It comprises the first intermediate frequency unit and the second intermediate frequency unit, and the first intermediate frequency amplifies demodulating unit.As Fig. 6, the first intermediate frequency unit is 110MHz filter circuit, and its output connects the input of the second intermediate frequency unit; Second intermediate frequency unit is 10.7MHz filter circuit, and its output connects the input that the first intermediate frequency amplifies demodulating unit; First intermediate frequency amplifies the typical application circuit that demodulating unit is the amplification demodulation chip of LA1140 by model and forms.First Receiver Module export high frequency radio signals obtain after the mixting circuit of 40.2333MHz after the first intermediate frequency unit filtering respectively 10.7MHz high-frequency signal, export to after the second intermediate frequency unit mixing and filtering first intermediate frequency amplify demodulating unit amplify demodulation.First intermediate frequency unit and the second intermediate frequency unit twice mixing and filtering improve interference free performance and the signal purity degree of radiofrequency signal.
Second intermediate frequency amplifies demodulation module, for amplify that the second Receiver Module exports high-frequency signal and demodulate audio signal and select module and high frequency identification signal to control module to audio intensity; As Fig. 7, it comprises the 3rd intermediate frequency unit and the 4th intermediate frequency unit, and the second intermediate frequency amplifies demodulating unit.3rd intermediate frequency unit is identical with operation principle with the circuit of the first intermediate frequency unit, 4th intermediate frequency unit is identical with operation principle with the circuit of the 3rd intermediate frequency unit, it is identical with operation principle with the circuit of the second intermediate frequency amplification demodulating unit that second intermediate frequency amplifies demodulating unit, do not repeat them here.
Audio intensity selects module, and the intensity exported for selecting the first intermediate frequency amplification demodulation module and the second intermediate frequency amplification demodulation module comparatively Qiang mono-tunnel audio signal exports to dio Output Modules.As Fig. 7, the high frequency identification signal of amplifying demodulation module and the second intermediate frequency amplification demodulation module when the first intermediate frequency exports to control module, control module compares the intensity of two-way high frequency identification signal, the high frequency identification signal intensity of amplifying demodulation module output as the first intermediate frequency is stronger, then control module exports high level to the base stage of triode Q401, triode Q401 conducting, its collector electrode drags down, electronic switch U400A, U400D disconnects, the restituted signal containing audio signal that first intermediate frequency amplifies the output of demodulating unit the 8th pin exports to electronic switch U400B after U401B amplifies, 5th pin of U400B is high level, 6th pin of U400C is high level, 4th pin of U400B and the 3rd pin close, restituted signal exports to electronic switch U400C, 8th pin of U400C and the 9th pin close, thus restituted signal stronger for intensity is exported to follow-up dio Output Modules.Otherwise, the high frequency identification signal intensity of amplifying demodulation module output as the second intermediate frequency is stronger, then control module output low level is to the base stage of triode Q401, triode Q401 ends, its current collection very high level, 1st pin of electronic switch U400A and the 2nd pin close, 10th pin of electronic switch U400D and the 2 12 pin close, 5th pin of electronic switch U400B and the 3rd pin disconnect, 8th pin of U400C and the 9th pin close, second intermediate frequency amplifies the restituted signal containing audio signal that demodulating unit the 8th pin exports after U401A amplifies through electronic switch U400A, U400C exports to follow-up dio Output Modules.
Dio Output Modules, after selecting the audio output signal of module to carry out noise reduction and amplification, then exports after amplification filtering audio intensity; As Fig. 9, wherein noise reduction and amplifying unit adopt model to be the typical application circuit of SA571, and amplification filtering unit adopts multi-stage operational amplifier to amplify, resistance capacitance filtering.
Control module, adopt the processor of PIC16F74 model, relatively the first intermediate frequency amplifies the high frequency identification signal of demodulation module and the output of the second intermediate frequency amplification demodulation module, according to the strength degree of two-way high frequency identification signal, control audio intensity select the disconnection of the electronic switch in module and close, to realize the output compared with Qiang mono-tunnel audio signal.
Embodiment two:
As Figure 10, the true diversity receiver of wireless microphone in the present embodiment forms roughly the same with the circuit in embodiment one, difference is that also comprising the 3rd intermediate frequency amplifies demodulation module, and the 4th intermediate frequency amplifies demodulation module, and audio intensity selects module to have four tunnel selection functions.Wherein the 3rd intermediate frequency amplification demodulation module is roughly the same with the circuit structure that the first intermediate frequency in embodiment one amplifies demodulation module, and difference is that third antenna is different with the frequency of the first antenna; It is roughly the same with the circuit that the second intermediate frequency in embodiment one amplifies demodulation module that 4th intermediate frequency amplifies demodulation module, and difference is that the 4th antenna is different with the frequency of the second antenna.But third antenna is identical with the electrical characteristic of the 4th antenna.This object that two-way Received signal strength is set in addition be tonequality in order to ensure audio signal more close to primary sound, such as the first antenna and the second antenna adopt bass antenna, and third antenna and the 4th antenna adopt high pitch antenna.Audio intensity select model choice to go out in bass audio signal comparatively in Qiang mono-road and treble audio signal comparatively Qiang mono-tunnel export to dio Output Modules.When the high pitch in audio signal and bass signal export to dio Output Modules, because audio signal contains the high pitch of primary sound and the frequency spectrum of bass part, output tonequality can be made close to the effect of primary sound.
Certainly, the receiving circuit that two-way adopts middle pitch antenna can also be added in addition again, for receiving and the middle pitch frequency spectrum in audio signal.
The foregoing is only the preferred embodiment of this patent, be not limited to this patent, for a person skilled in the art, this patent can have various modifications and variations.Within all spirit at this patent and principle, any amendment done, equivalent replacement, improvement etc., within the protection range that all should be included in this patent.
Claims (4)
1. the true diversity receiver of wireless microphone, comprising: audio intensity selects module, control module, at least one group of radio-frequency (RF) receiving circuit, and at least one group of intermediate frequency amplifies demodulator circuit; Often organize in radio-frequency (RF) receiving circuit and comprise at least two identical Receiver Modules, often organize intermediate frequency and amplify in demodulator circuit and comprise at least two identical intermediate frequencies and amplify demodulation module; The output of described Receiver Module connects the input that described intermediate frequency amplifies demodulation module one to one;
Described Receiver Module, for receiving the radiofrequency signal in the multiple path of wireless microphone and exporting to described intermediate frequency amplification demodulation module after mixing amplification;
Described intermediate frequency amplifies demodulation module, for amplify that described Receiver Module exports high-frequency signal and demodulate audio signal and select module and high frequency identification signal to control module to audio intensity;
Described audio intensity selects module, amplifies the stronger audio signal of demodulation module output intensity export for selecting described intermediate frequency;
Described control module, more described identical intermediate frequency amplifies the high frequency identification signal that demodulation module exports, and according to the strength degree of two-way high frequency identification signal, controls the selection function that audio intensity selects module, to realize the output compared with Qiang mono-tunnel audio signal.
2. the true diversity receiver of wireless microphone as claimed in claim 1, is characterized in that: it comprises one group of high pitch radio-frequency (RF) receiving circuit and one group of bass radio-frequency (RF) receiving circuit, and two groups of intermediate frequencies amplify demodulator circuit.
3. the true diversity receiver of wireless microphone as claimed in claim 2, it is characterized in that: described high pitch and/or bass radio-frequency (RF) receiving circuit include the first Receiver Module and the second Receiver Module, first Receiver Module comprises the first antenna, first VCO amplifying unit, the first phase locked-loop unit; Second Receiver Module comprises the second antenna, the second VCO amplifying unit; First antenna and the second antenna receive the radiofrequency signal of wireless microphone transmitting through filtering with after amplifying, export to the first VCO amplifying unit and the second mixing of VCO amplifying unit and amplification respectively, the first phase locked-loop unit gives the first VCO amplifying unit and the second VCO amplifying unit for generation of the carrier signal of phase stabilization.
4. the true diversity receiver of wireless microphone as claimed in claim 2, is characterized in that: described intermediate frequency amplifies demodulator circuit and comprises the first intermediate frequency amplification demodulation module and the second intermediate frequency amplification demodulation module; Described first intermediate frequency amplifies demodulation module, comprises the first intermediate frequency unit and the second intermediate frequency unit, and the first intermediate frequency amplifies demodulating unit; Described second intermediate frequency amplifies demodulation module, comprises the 3rd intermediate frequency unit and the 4th intermediate frequency unit, and the second intermediate frequency amplifies demodulating unit; Described first intermediate frequency unit and the 3rd intermediate frequency unit, described second intermediate frequency unit and the 4th intermediate frequency unit is exported to respectively after high frequency radio signals for exporting described Receiver Module carries out filtering and mixing, then after described second intermediate frequency unit and the 4th intermediate frequency unit filtering and mixing, export to described first intermediate frequency respectively amplify demodulating unit and the second intermediate frequency amplification demodulating unit, described first intermediate frequency amplifies demodulating unit and the second intermediate frequency amplifies demodulating unit for amplifying and high frequency radio signals described in demodulation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420732368.2U CN204349984U (en) | 2014-11-28 | 2014-11-28 | The true diversity receiver of wireless microphone |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420732368.2U CN204349984U (en) | 2014-11-28 | 2014-11-28 | The true diversity receiver of wireless microphone |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204349984U true CN204349984U (en) | 2015-05-20 |
Family
ID=53233221
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420732368.2U Active CN204349984U (en) | 2014-11-28 | 2014-11-28 | The true diversity receiver of wireless microphone |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204349984U (en) |
-
2014
- 2014-11-28 CN CN201420732368.2U patent/CN204349984U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US8270925B2 (en) | Extended antenna module and applications thereof | |
| US8014732B2 (en) | Programmable antenna assembly and applications thereof | |
| CN103647564B (en) | A kind of binary channels short-wave signal diversity system and method for reseptance thereof | |
| CN104604145A (en) | Transceiver front-end | |
| KR20220031674A (en) | Radio Frequency Front End Circuits and Mobile Terminals | |
| CN101971492A (en) | Signal branching filter, electronic device using the same, antenna apparatus, and signal transmission method | |
| CN210986100U (en) | Radio frequency front-end circuit and electronic equipment for NR and EN-DC (noise, noise and noise) communication of 5G | |
| CN103368718A (en) | Full-duplex wireless communication device, method and system | |
| CN112865832B (en) | Ground observation whistle ultrashort wave over-the-horizon information transmission equipment and transmission method | |
| CN103428829A (en) | Method for optimizing communication terminal power consumption and communication terminal | |
| CN203608188U (en) | Dual-channel shortwave signal diversity receiving system | |
| CN110829025A (en) | Antenna module, terminal and method for adjusting antenna isolation | |
| CN204119169U (en) | A kind of wifi signal amplifier and amplification system | |
| CN105830385B (en) | Signal processing apparatus, amplifier and method | |
| CN105743831A (en) | Radio frequency processing method based on WIFI230mHz | |
| CN209267578U (en) | A kind of multi-band signal integrated amplifier and its antenna | |
| CN204349984U (en) | The true diversity receiver of wireless microphone | |
| CN106656071A (en) | Uniform matching system with bypass channel and low-noise amplifier and used for 5GHz WiFi communication | |
| CN102625488A (en) | Mobile terminal | |
| CN204967801U (en) | Antenna circuitry and mobile terminal | |
| TWI462537B (en) | Communication apparatus and radio frequency equalizer | |
| CN204131508U (en) | A kind of radio ultra short wave communication receiver | |
| CN109525261A (en) | FM receives circuit | |
| CN103888169A (en) | Gain control method for ultra short wave reception channel | |
| CN203457146U (en) | Radio ultra-short frequency receiver |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |