CN201869346U - Sound signal processing device of infrared wireless microphone for teaching - Google Patents
Sound signal processing device of infrared wireless microphone for teaching Download PDFInfo
- Publication number
- CN201869346U CN201869346U CN2010206404932U CN201020640493U CN201869346U CN 201869346 U CN201869346 U CN 201869346U CN 2010206404932 U CN2010206404932 U CN 2010206404932U CN 201020640493 U CN201020640493 U CN 201020640493U CN 201869346 U CN201869346 U CN 201869346U
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- signal processing
- sound
- main amplifier
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Abstract
The utility model discloses a sound signal processing device of an infrared wireless microphone for teaching, which is used for performing multiple pre-processing on sound signals. The sound signal processing device is characterized by comprising a sound receiving probe and a processing and reducing unit which are electrically connected, wherein the sound receiving probe comprises an A/D (analog/digital) converter, the processing and reducing unit comprises a pre-amplifier, a noise reduction circuit and a main amplifier; the sound receiving probe is used for performing A/D conversion on collected sound signals, and then inputting the sound signals into the input end of a circuit of the pre-amplifier; the circuit of the pre-amplifier is used for amplifying the signals, and the signals further enter the noise reduction circuit for noise reduction and then are output to the main amplifier for further amplification. Compared with the prior art, the sound signal processing device has high sensitivity, good sound amplifying effect and low degree of distortion, and can not only be used for classroom education, but also be widely used for conferences, broadcasts and performances.
Description
[technical field]
The utility model relates to a kind of speech signal processing device, particularly a kind of audio-signal processing apparatus that is applicable to teaching with the infrared radio microphone.
[background technology]
Voice signal transmission comprises that the electric current that wired and wireless two big classes, so-called wire transmission refer in the lead constantly changes along with the power of sound and speed, promptly comes the variation of simulated sound power with the variation of current strength, need connect up on a large scale, wastes time and energy.So-called wireless transmission refers to the voice signal of encoding compression through the digital microwave Channel Modulation, and by the antenna emission, flexibility is strong again, takes infrared mode to propagate more.In school instruction work, the teacher often will constantly change the position of standing when giving lessons, and is all the more so when projecting apparatus particularly being arranged or doing demonstration, and the infrared microphone in using at present causes jitter, a riot of sound teaching efficiency that influenced because of moving.A lot of for this reason people are being devoted to study stability how to strengthen infrared radio microphone system works in moving teaching and repeatable.
[summary of the invention]
Technical assignment of the present utility model is at above the deficiencies in the prior art, a kind of teaching infrared radio microphone audio-signal processing apparatus is provided, before signal enters infrared transmitter, sound is carried out multiple pre-process, in the hope of when increasing power, reducing noise.
The technical scheme in the invention for solving the technical problem is: a kind of teaching infrared radio microphone audio-signal processing apparatus, it is characterized in that: comprise the sound reception probe of electrical connection and handle reduction unit, wherein, described sound reception probe comprises the A/D converter, handles reduction unit and comprises preamplifier, Dolby circuit and main amplifier; The voice signal that described sound reception probe will be collected carries out the input that A/D transforms back input preamplifier circuit, and preamplifier circuit amplifies signal, enters to export main amplifier to behind the Dolby circuit noise reduction and further amplify again.
Above-mentioned processing reduction unit also comprises frequency compensated circuit, and signal enters frequency compensated circuit behind the Dolby circuit noise reduction, signal is carried out feeding back to after the frequency compensation input of main amplifier.
The final stage of above-mentioned main amplifier adopts the category-B push-push circuit.
Compared with prior art, the utlity model has following outstanding beneficial effect:
1, highly sensitive, amplify effective;
2, the distortion factor is little, except that being used for can also being widely used in meeting, broadcasting, performance the classroom instruction.
[description of drawings]
Fig. 1 is a structural representation of the present utility model.
[embodiment]
Below in conjunction with specification drawings and specific embodiments the utility model is further specified.
As shown in Figure 1, the utility model comprises the sound reception probe of electrical connection and handles reduction unit.Wherein:
Described sound reception probe comprises the A/D converter.
Described processing reduction unit comprises preamplifier, Dolby circuit, frequency compensated circuit and main amplifier.
Described sound reception probe carries out A/D with the voice signal of collecting and is converted into the signal of telecommunication, the input of input preamplifier circuit after the detection, preamplifier is to faint voice signal voltage amplification, purpose is to carry out the volume adjustment, the signal of telecommunication that amplifies enters the Dolby circuit noise reduction again to carry out the tonequality adjustment, after export frequency compensated circuit to, signal is carried out frequency compensation to remedy the attenuate frequencies that moves appearance because of the position, after feed back to the input of main amplifier, main amplifier carries out further power amplification and exports infrared radio microphone infrared transmitter to.
The stability of infrared radio signal is relevant with the infrared transmitting tube input power, so in order to reach the stability of infrared radio microphone system works, require the main amplifier final stage to export sizable power, the final stage of described main amplifier adopts the category-B push-push circuit.
Need to prove; particular of the present utility model is described in detail the utility model; for a person skilled in the art, in the various conspicuous change of under the situation that does not deviate from spirit and scope of the present utility model it being carried out all within protection range of the present utility model.
Claims (3)
1. a teaching is with infrared radio microphone audio-signal processing apparatus, it is characterized in that: comprise the sound reception probe of electrical connection and handle reduction unit, wherein, described sound reception probe comprises the A/D converter, handles reduction unit and comprises preamplifier, Dolby circuit and main amplifier; The voice signal that described sound reception probe will be collected carries out the input that A/D transforms back input preamplifier circuit, and preamplifier circuit amplifies signal, enters to export main amplifier to behind the Dolby circuit noise reduction and further amplify again.
2. teaching according to claim 1 infrared radio microphone audio-signal processing apparatus, it is characterized in that described processing reduction unit also comprises frequency compensated circuit, signal enters frequency compensated circuit behind the Dolby circuit noise reduction, signal is carried out feeding back to after the frequency compensation input of main amplifier.
3. teaching according to claim 1 is characterized in that with infrared radio microphone audio-signal processing apparatus the final stage of described main amplifier adopts the category-B push-push circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206404932U CN201869346U (en) | 2010-11-26 | 2010-11-26 | Sound signal processing device of infrared wireless microphone for teaching |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206404932U CN201869346U (en) | 2010-11-26 | 2010-11-26 | Sound signal processing device of infrared wireless microphone for teaching |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201869346U true CN201869346U (en) | 2011-06-15 |
Family
ID=44140487
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010206404932U Expired - Fee Related CN201869346U (en) | 2010-11-26 | 2010-11-26 | Sound signal processing device of infrared wireless microphone for teaching |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201869346U (en) |
-
2010
- 2010-11-26 CN CN2010206404932U patent/CN201869346U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110615 Termination date: 20111126 |