CN206411654U - A kind of external sound card - Google Patents
A kind of external sound card Download PDFInfo
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- CN206411654U CN206411654U CN201720014827.7U CN201720014827U CN206411654U CN 206411654 U CN206411654 U CN 206411654U CN 201720014827 U CN201720014827 U CN 201720014827U CN 206411654 U CN206411654 U CN 206411654U
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Abstract
A kind of external sound card, it includes：First audio signal input end mouthful, it is used to obtain the first audio signal；Codec circuit, it is connected with the first audio signal input end mouthful；Audio frame；Sound effect processing circuit, it is connected with audio frame and codec circuit.The external sound card allow users to control sound effect processing circuit to transmit codec circuit by adjusting audio frame come digital audio and video signals handle, enable a user to come according to actual needs to be adjusted the audio of external sound card, the external sound card can not only eliminate correlated noise using the mode of difference processing simultaneously, so as to ensure the quality of the audio signal accessed by audio signal input end mouthful, additionally it is possible to 2 times of the dynamic range expansion for the audio signal for being generated correspondence amplifier.
Description
Technical field
The utility model is related to audio signal processing technique field, specifically, is related to a kind of external sound card.
Background technology
With developing rapidly for Internet technology, the Related product on network audio/video also progresses into masses and regarded
It is wild.The Related product of network audio/video usually requires to be equipped with external sound card, and the external sound card of different model has different sounds
Frequency processing function, the various demands for meeting users.
Existing external sound card is typically only capable to enough according to default processing parameter come to certain received, audio is believed all the way
Number carry out audio frequency process, for existing a variety of application scenarios, it can not meet requirement.
Utility model content
To solve the above problems, the utility model provides a kind of external sound card, the external sound card includes：
First audio signal input end mouthful, it is used to obtain the first audio signal；
Codec circuit, it is connected with first audio signal input end mouthful；
Audio frame；
Sound effect processing circuit, it is connected with the audio frame and codec circuit.
According to one embodiment of the present utility model, the sound effect processing circuit includes：
Functional unit；
Controller, it is connected with functional unit；
Sound effect processor, it is connected with the controller and codec circuit.
According to one embodiment of the present utility model, the controller is also connected with the codec circuit.
According to one embodiment of the present utility model, the codec circuit includes：
Coding decoder；
First amplifier, its input is connected with first audio signal input end mouthful, and output end is solved with the coding
The first input end connection of code device；
Second amplifier, its input is connected with the output end of first amplifier, output end and the coding and decoding
The second input connection of device, anti-phase processing is carried out for the signal to first amplifier transfer.
According to one embodiment of the present utility model, the external sound card also includes：
Second audio signal access interface, it is connected with the codec circuit.
According to one embodiment of the present utility model, the codec circuit also includes：
3rd amplifier, its input is connected with second audio signal input end mouthful, and output end is solved with the coding
The 3rd input connection of code device；
4th amplifier, its input is connected with the output end of the 3rd amplifier, output end and the coding and decoding
The 4th input connection of device, anti-phase processing is carried out for the signal to the 3rd amplifier transfer.
According to one embodiment of the present utility model, the external sound card also includes linear input port and analog-to-digital conversion electricity
Road, wherein, analog-digital conversion circuit as described is connected between the linear input port and sound effect processing circuit.
According to one embodiment of the present utility model, the external sound card also includes：
Linear mixer circuit, the output end and linear input port of two input respectively with the codec circuit
Correspondence connection, output end is connected with corresponding audio output port.
According to one embodiment of the present utility model, the linear mixer circuit includes two linear audio mixings of structure identical
Branch road, wherein,
Two inputs of the first linear audio mixing branch road respectively with the output end of the codec circuit and linear input
Port correspondence is connected, and output end is connected with the first audio output port；
Two inputs of the second linear audio mixing branch road respectively with the output end of the codec circuit and linear input
Port correspondence is connected, and output end is connected with the second audio output port；
According to one embodiment of the present utility model, first audio output port includes earpiece audio output port,
The first linear audio mixing branch road includes the first mixer and power amplifier, wherein, the power amplifier is connected to described
Between first mixer and earpiece audio output port.
External sound card provided by the utility model can realize the audio mixing and audio effect processing to multipath audio signal, from
And improve the availability and compatibility of product.Meanwhile, the external sound card can also be realized and headset, earphone and/or active
The connection of sound equipment, therefore compared to existing external sound card, the interface resource of this external sound card more enriches, and it can be preferably
Effectively it is connected with a variety of external devices.
Made an uproar in addition, external sound card provided by the utility model can not only eliminate correlation using the mode of difference processing
Sound, so as to ensure the quality of the audio signal accessed by audio signal input end mouthful, additionally it is possible to generated correspondence amplifier
Audio signal 2 times of dynamic range expansion.
Other features and advantages of the utility model will illustrate in the following description, also, partly from specification
In become apparent, or understood by implementing the utility model.The purpose of this utility model and other advantages can pass through
Specifically noted structure is realized and obtained in specification, claims and accompanying drawing.
Brief description of the drawings
, below will be to embodiment in order to illustrate more clearly of the utility model embodiment or technical scheme of the prior art
Or the accompanying drawing required in description of the prior art does simple introduction：
Fig. 1 is the structural representation of the external sound card according to the utility model one embodiment；
Fig. 2 is the particular circuit configurations schematic diagram according to the utility model one embodiment.
Embodiment
Embodiment of the present utility model is described in detail below with reference to drawings and Examples, whereby to the utility model
How application technology means solve technical problem, and reach the implementation process of technique effect and can fully understand and implement according to this.
As long as it should be noted that not constituting each feature in each embodiment and each embodiment in conflict, the utility model
It can be combined with each other, the technical scheme formed is within protection domain of the present utility model.
Meanwhile, in the following description, many details are elaborated for illustrative purposes, it is new to this practicality to provide
The thorough understanding of type embodiment.It will be apparent, however, to one skilled in the art, that the utility model can be without
Here detail or described ad hoc fashion is implemented.
Fig. 1 shows the structural representation for the external sound card that the present embodiment is provided, and Fig. 2 shows that the present embodiment is provided
External sound card physical circuit schematic diagram, make below in conjunction with Fig. 1 and Fig. 2 come the external sound card provided the present embodiment into one
Step ground explanation.
As shown in figure 1, the external sound card that the present embodiment is provided is preferably included：First audio signal input end mouthful 101,
Second audio signal input end mouthful 102, audio frame 103, sound effect processing circuit 104 and codec circuit 105.Wherein,
First audio signal input end mouthfuls 101 is used to obtaining the first audio signal, and the second audio signal input end mouthful 102 is used to obtaining the
Two audio signals.First audio signal input end mouthful the 101, second audio signal input end mouthful 102 respectively with codec circuit
105 corresponding ports connection, for by above-mentioned first audio signal and the second audio signal transmission to codec circuit 105.
In the present embodiment, codec circuit 105 can be carried out to the first audio signal received and the second audio signal
Analog-to-digital conversion, then transmits the digital audio and video signals that analog-to-digital conversion is obtained to sound effect processing circuit 104.
Specifically, it is defeated with the audio signal of the first audio signal input end mouthful 101 and second as shown in Fig. 2 in the present embodiment
Inbound port 102 is corresponding, and codec circuit 105 preferably includes coding decoder 205, four amplifiers and four sounds
Frequency signal input part.Wherein, the input of the first amplifier 201 and the first audio signal input end mouthfuls 101 be connected, output end and
The first input end A1 connections of coding decoder 205, it is used to transmit come first to the first audio signal input end mouthful 101
Audio signal is amplified processing, and by the audio signal transmission after amplification to coding decoder 205.
The input of second amplifier 202 is connected with the output end of the first amplifier 201, output end and coding decoder
205 the second input B1 connections, its audio for being used to export the first amplifier 201 carries out anti-phase processing, and will
The anti-phase obtained audio signal transmission of handling is to coding decoder 205.
Assuming that the first audio signal accessed by the first audio signal input end mouthful 101 is a, then the first amplifier
The 201 audio signal F exported1It can then be expressed as：
F1=E*a (1)
Wherein, E represents the multiplication factor of the first amplifier 201.
Inverting function is act as by what the second amplifier 202 was played, its audio that can't be received to itself letter
Number it is amplified, therefore the audio signal F that the second amplifier 202 is exported2It can then be expressed as：
F2=-E*a (2)
Coding decoder 205 is receiving the audio signal that the first amplifier 201 and the transmission of the second amplifier 202 come
Afterwards, analog-to-digital conversion can be carried out to above-mentioned audio signal.However, audio signal meeting during transmitting to coding decoder 205
It is coupled into new interference signal b, and is also possible in analog-digital conversion process is carried out to introduce quantizing noise c.Due to the first amplification
The physics of signal transmission path between device 201 and the amplifier 202 of coding decoder 205 and second and coding decoder 205
Condition is consistent, therefore the noise in the two signal transmission paths is common-mode noise, that is, is existed：
S1=F1+ b+c=E*a+b+c (3)
S2=F2+ b+c=-E*a+b+c (4)
Wherein, S1The signal that the corresponding data transfer path of 205 pair of first amplifier of presentation code decoder 201 is transmitted
Carry out the digital audio and video signals obtained by analog-to-digital conversion, S2The corresponding data of 205 pair of second amplifier of presentation code decoder 202
The signal that transmission path is transmitted carries out the digital audio and video signals obtained by analog-to-digital conversion.
Coding decoder 205 can be by above-mentioned digital audio and video signals S1With digital audio and video signals S2Transmit to the sound being attached thereto
Imitate process circuit 104.Specifically, as shown in Fig. 2 in the present embodiment, sound effect processing circuit 104 is preferably included：Controller
206th, sound effect processor 207 and functional unit 208.Wherein, functional unit preferably includes some buttons or knob, these behaviour
Make part to be connected with controller 206.When user operates corresponding button or knob, controller 206 will be moved according to aforesaid operations
Make and produce corresponding control instruction.Now sound effect processor 207 also will be according to above-mentioned control instruction to received number
Word signal is handled.In the present embodiment, controller 206 is also connected with coding decoder 205, and such user can also pass through behaviour
Make part 208 to utilize controller 206 to control the running status of coding decoder 205.
In the present embodiment, audio frame 103 is connected with controller 206.Specifically, audio frame 103 preferably passes through USB
Interface is connected with controller 206, and controller 206 is preferably connected by SPI interface with sound effect processor 207, controller 206
Preferably pass through I2C buses are connected with coding decoder 205, and sound effect processor 207 preferably passes through I2S buses and coding and decoding
Device 205 is connected.Certainly, in other embodiment of the present utility model, audio frame 103, coding decoder 205, audio effect processing
Other rational connected modes, the utility model not limited to this can also be used between device 207 and controller 206.
In the present embodiment, controller 206 is preferably by micro-control unit (Microcontroller Unit, abbreviation
MCU) realize, and sound effect processor 207 preferably by digital signal processor (Digital Signal Processor,
Abbreviation DSP) realize.It is pointed out that in other embodiment of the present utility model, coding decoder 205, audio effect processing
Device 207 and controller 206 can also be realized using other rational circuits or device, the utility model not limited to this.
Sound effect processing circuit 104 is receiving above-mentioned digital audio and video signals S1With digital audio and video signals S2Afterwards, can be to above-mentioned number
Word audio signal S1With digital audio and video signals S2Difference (subtraction) processing is carried out, so as to obtain final useful signal S ', that is, is deposited
：
S '=S1-S2 (5)
By difference processing, external sound card can not only eliminate noise b and noise c, so as to ensure that the first audio signal
The quality of the first audio signal accessed by input port 101, additionally it is possible to the audio signal for being generated the first amplifier 201
2 times of dynamic range expansion (6dB).
In the present embodiment, the input of the 3rd amplifier 203 is connected with the second audio signal input end mouthful 102, output end
Be connected with the 3rd input A2 of coding decoder 205, its be used to transmitting the second audio signal input end mouthfuls 102 the
Two audio signals are amplified processing, and by the audio signal transmission after amplification to coding decoder 205.
The input of 4th amplifier 204 is connected with the output end of the 3rd amplifier 203, output end and coding decoder
205 the 4th input B2 connections, its audio for being used to export the 3rd amplifier 203 carries out anti-phase processing, and will
The anti-phase obtained audio signal transmission of handling is to coding decoder 205.
It is pointed out that in the present embodiment, coding decoder 205 and sound effect processor 207 amplify to the above-mentioned 3rd
The handling principle and processing procedure that the amplifier 204 of device 203 and the 4th transmits the audio signal come are put with above-mentioned to first
The handling principle and processing procedure that the big amplifier 202 of device 201 and second transmits the audio signal come are identical, therefore herein not
The contents of the section is repeated again.
In the present embodiment, sound effect processor 207 can respectively according to coding decoder 205 transmit come two groups of audio signals
(two common-mode signals are included in wherein every group audio signal), which calculates, to be obtained corresponding respectively to the first audio signal and the second audio
Two digital audio and video signals of signal.Sound effect processor 207 can carry out the two digital audio and video signals audio mixing and related sound
Effect processing, and the digital audio and video signals obtained by after processing are transmitted to coding decoder 205, with by 205 pairs of coding decoder
Received digital audio and video signals carry out digital-to-analogue conversion to obtain corresponding simulated audio signal.
As depicted in figs. 1 and 2, the external sound card that the present embodiment is provided also includes：Linear input port 106 and modulus
Change-over circuit 107.Wherein, linear input port 106 is used to obtain linear audio signal, and accessed audio signal is passed
Transport to the analog to digital conversion circuit 107 being attached thereto.Analog to digital conversion circuit 107 is transmitting the sound come to linear input port 106
Frequency signal is carried out after analog-to-digital conversion, can be transmitted the digital audio and video signals being converted to sound effect processor 207, with by audio
Reason device 207 is handled accordingly according to the digital audio and video signals.
Meanwhile, as depicted in figs. 1 and 2, the external sound card that the present embodiment is provided preferably also includes：Linear mixer circuit
108 and corresponding audio output port 109.Wherein, to preferably include two structure identicals linear for linear mixer circuit 108
Audio mixing branch road, the first linear audio mixing branch road 108a two inputs respectively with the first output end Y1 of coding decoder 205 and
Linear input port 106 is connected, and it is used to transmit the audio come letter to coding decoder 205 and linear input port 106
Number stereo process is carried out, and obtained audio signal transmission will be handled to the first audio output port 109a being attached thereto.
The the second output end Y2 and line of second linear audio mixing branch road 108b two inputs respectively with coding decoder 205
Property input port 106 connect, it is used for audio signal transmit to coding decoder 205 and linear input port 106
Stereo process is carried out, and obtained audio signal transmission will be handled to the second audio output port 109b being attached thereto.
It is pointed out that according to actual needs, the first audio output port 109a and the second audio output port
Other reasonable devices, the utility model not limited to this can also be connected between 109b and corresponding linear audio mixing branch road.
If for example, the first audio output port 109a is ear-piece output mouthful, in order to ensure the driving energy of audio signal
Power amplifier can also be connected between power, the linear audio mixing branch road 108a of the first audio output port 109a and first.
It is pointed out that in other embodiment of the present utility model, according to actual needs, what external sound card was included
The quantity of audio signal input end mouthful can also be other reasonable values, corresponding, the number of amplifier in codec circuit
The quantity of the input of amount and coding decoder can also be configured to analog value, the utility model not limited to this.
In the present embodiment, sound effect processing circuit 104 is connected with audio frame 103 with codec circuit 105 respectively.This reality
Apply in example, user control sound effect processing circuit 104 to transmit codec circuit 105 by adjusting audio frame 103 come
Digital audio and video signals handled, and by handle obtain with corresponding audio digital audio and video signals feed back to coding and decoding
Circuit 105.The external sound card allows users to control sound effect processing circuit by adjusting audio frame to coding and decoding electricity
Road is transmitted the digital audio and video signals come and handled, and enables a user to carry out the sound to external sound card according to actual needs
Effect is adjusted.
As can be seen that external sound card provided by the utility model can be realized to multipath audio signal from foregoing description
Audio mixing and audio effect processing, so as to improve the availability and compatibility of product.Meanwhile, the external sound card can also be realized
With the connection of headset, earphone and/or active loundspeakerses, therefore compared to existing external sound card, the interface resource of this external sound card
More enrich, it preferably can be effectively connected with a variety of external devices.
Made an uproar in addition, external sound card provided by the utility model can not only eliminate correlation using the mode of difference processing
Sound, so as to ensure the quality of the audio signal accessed by audio signal input end mouthful, additionally it is possible to generated correspondence amplifier
Audio signal 2 times of dynamic range expansion.
It should be understood that embodiment disclosed in the utility model is not limited to specific structure disclosed herein, and answer
When the equivalent substitute for extending to these features that those of ordinary skill in the related art are understood.It is to be further understood that herein
The term used is only used for describing the purpose of specific embodiment, and is not intended to limit.
" one embodiment " or " embodiment " mentioned in specification means special characteristic, the structure described in conjunction with the embodiments
Or characteristic is included at least one embodiment of the present utility model.Therefore, the phrase " one that specification various places throughout occurs
Individual embodiment " or " embodiment " might not refer both to same embodiment.
Although above-mentioned example is used to illustrate principle of the utility model in one or more applications, for this area
For technical staff, in the case of without departing substantially from principle of the present utility model and thought, hence it is evident that can in form, usage and reality
Various modifications may be made in the details applied and without paying creative work.Therefore, the utility model by appended claims Lai
Limit.
Claims (10)
1. a kind of external sound card, it is characterised in that the external sound card includes：
First audio signal input end mouthful, it is used to obtain the first audio signal；
Codec circuit, it is connected with first audio signal input end mouthful；
Audio frame；
Sound effect processing circuit, it is connected with the audio frame and codec circuit.
2. external sound card as claimed in claim 1, it is characterised in that the sound effect processing circuit includes：
Functional unit；
Controller, it is connected with functional unit；
Sound effect processor, it is connected with the controller and codec circuit.
3. external sound card as claimed in claim 2, it is characterised in that the controller also connects with the codec circuit
Connect.
4. such as external sound card according to any one of claims 1 to 3, it is characterised in that the codec circuit includes：
Coding decoder；
First amplifier, its input is connected with first audio signal input end mouthful, output end and the coding decoder
First input end connection；
Second amplifier, its input is connected with the output end of first amplifier, output end and the coding decoder
Second input is connected, and anti-phase processing is carried out for the signal to first amplifier transfer.
5. external sound card as claimed in claim 4, it is characterised in that the external sound card also includes：
Second audio signal access interface, it is connected with the codec circuit.
6. external sound card as claimed in claim 5, it is characterised in that the codec circuit also includes：
3rd amplifier, its input is connected with second audio signal input end mouthful, output end and the coding decoder
The 3rd input connection；
4th amplifier, its input is connected with the output end of the 3rd amplifier, output end and the coding decoder
4th input is connected, and anti-phase processing is carried out for the signal to the 3rd amplifier transfer.
7. such as external sound card according to any one of claims 1 to 3, it is characterised in that the external sound card also includes linear
Input port and analog to digital conversion circuit, wherein, analog-digital conversion circuit as described is connected to the linear input port and audio effect processing
Between circuit.
8. external sound card as claimed in claim 7, it is characterised in that the external sound card also includes：
Linear mixer circuit, output end and linear input port of two input respectively with the codec circuit is corresponding
Connection, output end is connected with corresponding audio output port.
9. external sound card as claimed in claim 8, it is characterised in that the linear mixer circuit includes two structure identicals
Linear audio mixing branch road, wherein,
The output end and linear input port of two inputs of the first linear audio mixing branch road respectively with the codec circuit
Correspondence connection, output end is connected with the first audio output port；
The output end and linear input port of two inputs of the second linear audio mixing branch road respectively with the codec circuit
Correspondence connection, output end is connected with the second audio output port.
10. external sound card as claimed in claim 9, it is characterised in that first audio output port includes earpiece audio
Output port, the first linear audio mixing branch road includes the first mixer and power amplifier, wherein, the power amplifier connects
It is connected between first mixer and earpiece audio output port.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720014827.7U CN206411654U (en) | 2017-01-06 | 2017-01-06 | A kind of external sound card |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720014827.7U CN206411654U (en) | 2017-01-06 | 2017-01-06 | A kind of external sound card |
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| Publication Number | Publication Date |
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| CN206411654U true CN206411654U (en) | 2017-08-15 |
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| CN201720014827.7U Active CN206411654U (en) | 2017-01-06 | 2017-01-06 | A kind of external sound card |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108206977A (en) * | 2018-01-11 | 2018-06-26 | 上海展扬通信技术有限公司 | Noise-reduction method, device and the computer readable storage medium of audio |
-
2017
- 2017-01-06 CN CN201720014827.7U patent/CN206411654U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108206977A (en) * | 2018-01-11 | 2018-06-26 | 上海展扬通信技术有限公司 | Noise-reduction method, device and the computer readable storage medium of audio |
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