CN2645177Y - Sound box with microphone - Google Patents
Sound box with microphone Download PDFInfo
- Publication number
- CN2645177Y CN2645177Y CNU032084838U CN03208483U CN2645177Y CN 2645177 Y CN2645177 Y CN 2645177Y CN U032084838 U CNU032084838 U CN U032084838U CN 03208483 U CN03208483 U CN 03208483U CN 2645177 Y CN2645177 Y CN 2645177Y
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- microphone
- audio amplifier
- output
- signal
- echo cancellation
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Abstract
The utility model relates to a sound box with microphone; the controlling circuit in the sound box comprises a horn and a power amplification circuit; the utility model is characterized in that: the controlling circuit in the sound box also comprises a microphone and an echo eliminating circuit; the echo eliminating circuit deletes and processes the signal from the confounding input signal, and the signal having the same signal spectrum from the host audio input. The horn input line in the sound box is connected with the computer host audio output port, and is divided into two lines: one line is connected with the horn by means of the power amplification circuit, and output the audio signal; the other line is connected with the echo eliminating circuit as the input signal; the output of the microphone as the input signal of the other line is also connected with the echo eliminating circuit; the output of the echo eliminating circuit is the microphone output line, and connected with the microphone input port of the computer host. The utility model has the advantages that the sound box can achieve the computer network hands-free voice communication at a lower cost, by means of eliminating the echo while processing the horn outputting sound.
Description
Technical field
The utility model relates to a kind of audio amplifier that has microphone, exactly, relates to a kind of microphone that is provided with, and sets up the audio amplifier of echo cancellation circuit coupling simultaneously in control circuit, so that this device can be applicable to occasions such as voice-over-net communication and Web conference.Belong to computing machine peripheral equipment technical field.
Background technology
Because Instant Messenger (IM) software such as MSN, the YAHOO of Yahoo, MESSAGER and Related product is popular, the user who utilizes network to carry out communication constantly increases.Traditional speech communication instrument is earphone and Mike, but wears earphone for a long time and Mike is very uncomfortable.And if in the environment that many people such as remote teaching, teleconference or the medical treatment consultation of doctors participate in, earphone and Mike just can't use.Therefore, how to utilize the application prospect of a simple voice hands-free device of audio amplifier and microphone formation very good.
But traditional microphone and audio amplifier are independent of each other, and there is bigger shortcoming in the phonetic entry output unit of forming that directly they fused: on the one hand, the line more complicated, the desktop that seems is messy to can't bear.On the other hand, when microphone when nearer or speaker volume is big apart from audio amplifier, the sound of loudspeaker output can feed back to microphone, adds the delay of network, makes the user who is positioned at the network other end can hear the echo of oneself speaking, and influence is conversation normally.Simultaneously, the audible warning that imports microphone into can form positive feedback, produces when serious and utters long and high-pitched sounds, and can't normally listen to.
The utility model content
The purpose of this utility model provides a kind of audio amplifier that has microphone, this audio amplifier is provided with microphone, and in control circuit, set up simultaneously echo cancellation circuit coupling, the sound signal of loudspeaker output is carried out echo cancellation handle, can realize the voice hand-free function of computer network communication with lower cost.
The purpose of this utility model is achieved in that a kind of audio amplifier that has microphone, and the control circuit in this audio amplifier includes loudspeaker and power amplification circuit; It is characterized in that: also include microphone and echo cancellation circuit coupling in the control circuit in the described audio amplifier, described echo cancellation circuit coupling to mixing in the input signal from microphone, with delete processing from the identical signal of the audio input signal spectrum signature of main frame.
Control circuit in the described audio amplifier is provided with loudspeaker incoming line and the microphone output line that is connected respectively with the audio output interface of main frame and microphone input interface; Wherein the loudspeaker incoming line is divided into two-way, lead up to be connected to loudspeaker behind the power amplification circuit, and output audio signal, another road is connected to echo cancellation circuit coupling as one road input signal wherein; The output of microphone then is connected to echo cancellation circuit coupling as another road input signal, and the output line of this echo cancellation circuit coupling is the microphone output line.
Echo cancellation circuit coupling in the described audio amplifier is made up of the DSP chip of model FM1073 and peripheral circuit thereof.
43,44 pins of the DSP chip of model FM1073 connect from the sound signal of main frame output in the echo cancellation circuit coupling in the described audio amplifier, 37,38 pins connect from the sound signal of microphone output, and 47,48 pins connect the microphone input interface of main frame as signal output part.
Supply voltage in the echo cancellation circuit coupling in the described audio amplifier is 2.5 volts, and this power supply is that dividing potential drop obtains from the supply voltage of audio amplifier control circuit.
The DSP chip of model FM1073 can connect 1-3 microphone at three microphone input ends of its Mic in0 pin 37,38, Mic in1 pin 39,40, Mic in2 pin 41,42 in the echo cancellation circuit coupling in the described audio amplifier.
Described audio amplifier in front plate or/and side panel or/and rear panel is provided with 1～3 aperture, is equipped with microphone in this aperture.
The utility model is the audio amplifier that has microphone, and its technical characterstic is to set up microphone and echo cancellation circuit coupling in the audio amplifier control circuit, produces echo when the speech communication and utters long and high-pitched sounds avoiding.Wherein adopt the DSP chip of FM1073 and the echo cancellation circuit coupling that peripheral circuit is formed thereof, simple in structure, compact, reliable operation, stable.The also configurable microphone matrix that reaches three microphones of this device provides more satisfactory input-output device for holding Web conference, also is the peripherals of a kind of practicality, convenience, cheap voice-over-net communication.This device can bundle the input-output line of sound signal, from outside surface, and the line neat appearance.
Description of drawings
Fig. 1 is that control circuit structure of the present utility model is formed block scheme.
Fig. 2 is that the structure of the digital signal processor (model is FM1073) of the echo cancellation circuit coupling in the control circuit of the present utility model is formed block scheme.
Fig. 3 is to be the electrical schematic diagram of the echo cancellation circuit coupling embodiment that forms of FM1073 digital signal processor and peripheral circuit thereof by model in the control circuit of the present utility model.
Embodiment
Referring to Fig. 1, the utility model is a kind of audio amplifier 2 that has microphone, and the control circuit in this audio amplifier 2 includes loudspeaker 5 and power amplification circuit 6; Be characterized on the front panel of audio amplifier 2, being provided with an aperture, microphone 4 is installed in aperture; Also include in this control circuit with mixing in the input signal from microphone 4, with the echo cancellation circuit coupling 3 of deleting processing from the identical signal of the audio input signal spectrum signature of main frame 1.Also expression among the figure: the control circuit in the audio amplifier 2 links to each other with the microphone input interface with the audio output interface of main frame 1 respectively with microphone output line 8 by loudspeaker incoming line 7.Wherein loudspeaker incoming line 7 is divided into two-way, and the power amplification circuit 6 of leading up to is connected to loudspeaker 5, output audio signal; Another road conduct wherein one road input signal is connected to echo cancellation circuit coupling 3; The output of microphone 4 also is connected to echo cancellation circuit coupling 3, and as another road input signal, the output line of this echo cancellation circuit coupling 3 is exactly a microphone output line 8.
Internal circuit block scheme referring to the DSP chip of model FM1073 shown in Figure 2.Echo cancellation circuit coupling in the utility model audio amplifier is exactly to be made up of DSP chip and the peripheral circuit thereof of model FM1073.Integrated digital-to-analogue and analog to digital conversion circuit DAC, ADC and digital signal processing circuit DSP in this FM1073 chip.Sound signal from main frame enters DSP from signal input Line in after analog-to-digital conversion circuit AD4 converts digital signal to, simultaneously, the voice signal from microphone also enters DSP after microphone input port Mic in1 converts digital signal to through analog-to-digital conversion circuit AD1.After DSP adopts the special Filtering Processing of variable step size frequency sub-band least mean square algorithm and Persian that these two signals are carried out computing, be converted to simulating signal by digital-to-analogue conversion circuit DA2 again after, export to the microphone interface of computing machine from signal output port Line out.This chip can reduce echo 52～65 decibels, thereby does not influence normal conversation signal.This circuit structure block scheme represents that the utility model can connect 1-3 microphone by this chip, wherein be arranged on inside and outside the aperture of offering on the front panel except a microphone 4, all the other two microphones can be separately positioned on the front panel of audio amplifier and/or about on two side panels and/or in the aperture of offering on the rear panel; Perhaps these two microphones are connected directly on the relevant pins of the echo cancellation circuit coupling of being made up of the DSP chip of model FM1073 by lead, promptly be connected directly on all the other two pins (Mic in1 and Mic in2) in the DSP chip of FM1073, form microphone matrix with the microphone that is positioned on the audio amplifier front panel.
Referring to Fig. 3, in echo cancellation circuit coupling of the present utility model, the sound signal process coupling capacitance of microphone output is connected to 37,38 pins of DSP chip FM1073, is connected to 43,44 pins of this chip through coupling capacitance from the sound signal of main frame output.Because it is stereo that voice signal does not need, as long as signal that will above-mentioned two sound channels mixes 37,38 pins and 43,44 pins among the figure of input afterwards respectively.47,48 pins of this chip connect the microphone input interface of main frame as the signal output part of echo cancellation circuit coupling.
The supply voltage of the echo cancellation circuit coupling in the utility model audio amplifier is 2.5 volts, and this power supply is that dividing potential drop obtains from the supply voltage of audio amplifier control circuit, and independently power supply needn't be set.
Working mechanism of the present utility model is: when carrying out network communication, main frame 1 is delivered to loudspeaker 5 again and is sounded after the sound signal of output is delivered to power amplification circuit 6 and amplified via loudspeaker incoming line 7.Simultaneously, this sound signal is also delivered to echo cancellation circuit coupling 3.Because the voice-over-net communication is the full duplex mode of operation, allow the user to listen while talk.Therefore, the sound that imports microphone 4 into comprises that useful family one's voice in speech signal and loudspeaker 5 feed back to the voice signal of microphone 4.When microphone 4 receives above-mentioned external sound, and deliver to echo cancellation circuit coupling 3 after being converted to electric signal, the function of echo cancellation circuit coupling 3 be exactly with mixing in the signal from microphone 4, with remove from the identical composition of the audio signal frequency spectrum feature in the loudspeaker incoming line 7, just eliminate the echo signal that loudspeaker 5 feed back to microphone 4.Deliver to main frame 1 through the signal after the echo cancellation processing by microphone output lead 8.
For the occasion of many people's participations such as Web conference, as long as a microphone is set usually.If neighbourhood noise can insert the microphone matrix that 2～3 microphones are formed than occasion big and that need many people to talk.These microphones form microphone matrix after according to certain position and fixed angle, have very highly directive, can only receive the voice signal that faces in the very narrow angle of microphone.Wherein two other microphone respectively with Fig. 3 in Mic in1 be connected with Mic in2.
Claims (7)
1, the control circuit in a kind of audio amplifier that has microphone, this audio amplifier includes loudspeaker and power amplification circuit; It is characterized in that: also include microphone and echo cancellation circuit coupling in the control circuit in the described audio amplifier, described echo cancellation circuit coupling to mixing in the input signal from microphone, with delete processing from the identical signal of the audio input signal spectrum signature of main frame.
2, the audio amplifier that has microphone according to claim 1 is characterized in that: the control circuit in the described audio amplifier is provided with loudspeaker incoming line and the microphone output line that is connected respectively with the audio output interface of main frame and microphone input interface; Wherein the loudspeaker incoming line is divided into two-way, lead up to be connected to loudspeaker behind the power amplification circuit, and output audio signal, another road is connected to echo cancellation circuit coupling as one road input signal wherein; The output of microphone then is connected to echo cancellation circuit coupling as another road input signal, and the output line of this echo cancellation circuit coupling is the microphone output line.
3, the audio amplifier that has microphone according to claim 1 is characterized in that: the echo cancellation circuit coupling in the described audio amplifier is made up of the DSP chip of model FM1073 and peripheral circuit thereof.
4, according to claim 1 or the 3 described audio amplifiers that have microphone, it is characterized in that: 43,44 pins of the DSP chip of model FM1073 connect from the sound signal of main frame output in the echo cancellation circuit coupling in the described audio amplifier, 37,38 pins connect from the sound signal of microphone output, and 47,48 pins connect the microphone input interface of main frame as signal output part.
5, according to claim 1 or the 3 described audio amplifiers that have microphone, it is characterized in that: the supply voltage in the echo cancellation circuit coupling in the described audio amplifier is 2.5 volts, and this power supply is that dividing potential drop obtains from the supply voltage of audio amplifier control circuit.
6, according to claim 1 or the 3 described audio amplifiers that have microphone, it is characterized in that: the DSP chip of model FM1073 can connect 1-3 microphone at three microphone input ends of its Mic in0 pin 37,38, Mic in1 pin 39,40, Mic in2 pin 41,42 in the echo cancellation circuit coupling in the described audio amplifier.
7, the audio amplifier that has microphone according to claim 1 is characterized in that: described audio amplifier in front plate or/and side panel or/and rear panel is provided with 1～3 aperture, is equipped with microphone in this aperture.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU032084838U CN2645177Y (en) | 2003-08-27 | 2003-08-27 | Sound box with microphone |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU032084838U CN2645177Y (en) | 2003-08-27 | 2003-08-27 | Sound box with microphone |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2645177Y true CN2645177Y (en) | 2004-09-29 |
Family
ID=34288669
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU032084838U Expired - Fee Related CN2645177Y (en) | 2003-08-27 | 2003-08-27 | Sound box with microphone |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2645177Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101370323B (en) * | 2007-08-15 | 2012-07-25 | 美商富迪科技股份有限公司 | Apparatus capable of performing acoustic echo cancellation and a method thereof |
| CN113035224A (en) * | 2019-12-09 | 2021-06-25 | 北京君正集成电路股份有限公司 | Equipment for eliminating echo and improving audio quality |
-
2003
- 2003-08-27 CN CNU032084838U patent/CN2645177Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101370323B (en) * | 2007-08-15 | 2012-07-25 | 美商富迪科技股份有限公司 | Apparatus capable of performing acoustic echo cancellation and a method thereof |
| CN113035224A (en) * | 2019-12-09 | 2021-06-25 | 北京君正集成电路股份有限公司 | Equipment for eliminating echo and improving audio quality |
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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 |