CN202583943U - Audio circuit and tablet computer with voice function - Google Patents
Audio circuit and tablet computer with voice function Download PDFInfo
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- CN202583943U CN202583943U CN 201220052323 CN201220052323U CN202583943U CN 202583943 U CN202583943 U CN 202583943U CN 201220052323 CN201220052323 CN 201220052323 CN 201220052323 U CN201220052323 U CN 201220052323U CN 202583943 U CN202583943 U CN 202583943U
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Abstract
The utility model discloses an audio circuit and a tablet computer with a voice function. The audio circuit and the tablet computer with the voice function comprises a microphone, an earphone and a loudspeaker, wherein the microphone picks up a voice signal and converts the voice signal into an analog electrical signal to output to a call codec; the call codec converts the analog electrical signal into a digital signal; after the call codec makes a speech coding, the digital signal is transmitted to a baseband chip to adjust and output to a radio frequency transceiver circuit; and after the radio frequency transceiver circuit adopts a frequency conversion process, the digital signal is launched out through an antenna. The call codec is connected with an audio codec. After an opposite voice signal is received and processed through the radio frequency transceiver circuit and the baseband chip in turn, the voice signal is transmitted to the audio codec to make a port selection and the opposite voice signal is output by a receiver of the earphone or the loudspeaker. The audio circuit is designed on a hardware platform based on the tablet computer and other mobile internet devices. The voice function of products is achieved without increasing cost of hardware of products and great convenience for user's daily life is brought.
Description
Technical field
The utility model belongs to the mobile internet device technical field, specifically, relates to a kind of voicefrequency circuit design proposal of voice call function and panel computer product that adopts said voicefrequency circuit design on mobile internet device, realized.
Background technology
Along with development of science and technology and progress, computer has experienced by desktop computer to notebook computer again to the development course of net book as a kind of high-tech end product.Meanwhile, the consumption view of young consumers of new generation also changes pursuing individuality, fashion, high-tech product freely into by conservative, practicality gradually.Under this background, the first generation IPAD product of Apple has just started the fast-selling storm of a panel computer in the whole world once appearing on the market.And, being accompanied by perfect with function popularized of panel computer product, panel computer becomes the new lover of stratum such as business people, student, white collar gradually, for people's life provides great facility.
Compare with the PC of traditional form; Distinguishing features such as that panel computer has is portable, attractive in appearance, fashion, man-machine interaction close friend; The more important thing is: conventional personal computer market has been tending towards saturated gradually, and each big PC manufacturer has been absorbed in the condition of the rate of profit of having to keep by rate war.In this case, break a deadlock, just because of this panel computer arises at the historic moment with regard to the product that presses for a kind of innovation.The success of IPAD product reflects from the side that also panel computer market containing huge business opportunity, has good market outlook.
For the mobile internet device MID that present numerous producer designed, all only have the 3G function of surfing the Net, and do not have voice call function.Like this, MID just can not replace mobile phone and become mobile communication product.And mobile phone has become the indispensable means of communication of people at present at one's side, and therefore, if can let MID have voice call function, this will all have vital practical significance at aspects such as enriching product function and enhancing product use value.
Summary of the invention
The purpose of the utility model is to provide a kind of voicefrequency circuit that is applicable to present mobile internet device, through adopting this voicefrequency circuit design, to realize the voice call function of mobile internet device.
For solving the problems of the technologies described above, the utility model adopts following technical scheme to be achieved:
A kind of voicefrequency circuit with voice call function comprises microphone, earphone and loudspeaker; Said microphone picks up voice signal and changes into analog electrical signal and exports the conversation codec to; Go forward side by side behind the lang sound coding to convert digital signal to; Transfer to after baseband chip modulates and export to RF transmit-receive circuit and carry out upconversion process, launch through antenna; Said conversation codec connects audio codec; Transfer to after audio codec carries out channel selecting receiving the other side's voice signal of handling back output via RF transmit-receive circuit and baseband chip successively, through headset earpiece or loudspeaker output the other side voice.
Further; Said microphone comprises main microphone and ear microphone; In order to realize sound-recording function; To transfer to audio codec simultaneously through the voice signal that main microphone or ear microphone pick up, and then after converting pulse code modulation signal to, transfer to storer via main control chip and preserve.
Preferably; Said main microphone is connected with described conversation codec is corresponding with audio coder & decoder (codec) respectively through a pair of differential signal line; Cross-over connection is useful on the electric capacity of eliminating differential mode noise between described differential signal line; On each signal line, be connected with a low-pass filter separately; The speech simulation electric signal of handling output through said electric capacity and low-pass filter transfers to described conversation codec through capacitance on the one hand, transfers to described audio coder & decoder (codec) through capacitance on the other hand.
In order to make the impedance on the differential signal line reach balance, in said differential signal line, the positive signal line is connected dc offset voltage through a resistance, the negative polarity signal wire is through another resistance eutral grounding, and the resistance of two resistance equates.
In order to eliminate the surge current of introducing through main microphone, with described differential signal line separately through a voltage dependent resistor (VDR) ground connection, with the surge current ground of releasing.
Voice output passage for ear microphone; Single-ended audio signal wire and the signal wire through resistance eutral grounding of said ear microphone are constituted a pair of differential signal line; Respectively with sub corresponding connection of the difference audio input end of conversation codec and audio codec; On each signal line that connects said difference audio input end, all be in series with capacitance, all cross-over connection has differential mode noise to suppress electric capacity between a pair of differential signal line that connects each group difference audio input end.
Further, on the single-ended audio signal wire of said ear microphone, be connected with voltage dependent resistor (VDR) and low-pass filter.
Preferably, the audio signal wire that said microphone is connected conversation codec and audio codec is laid in the signals layer of pcb board, preferably said signals layer is arranged between two stratum, audio signal wire is handled with wrapping the reduction noise.
Further again, said conversation codec transfers to described audio codec through the monophonic signal line after converting the other side's voice signal that receives to analog electrical signal; Said audio codec connects described loudspeaker through audio-frequency power amplifier.
Based on above-mentioned voicefrequency circuit design proposal; The utility model also provides a kind of said panel computer with voicefrequency circuit design of voice call function that adopts, and comprises main control chip, baseband chip, RF transmit-receive circuit, conversation codec, audio codec, storer, microphone, earphone and loudspeaker; Said microphone picks up voice signal and changes into analog electrical signal and exports the conversation codec to; Go forward side by side behind the lang sound coding to convert digital signal to; Transfer to after baseband chip modulates and export to RF transmit-receive circuit and carry out upconversion process, launch through antenna; After the other side's voice signal receives via RF transmit-receive circuit; Behind the baseband chip demodulating and decoding; Transfer to audio codec via described conversation codec, carry out channel selecting through said audio codec after, select through headset earpiece or loudspeaker output the other side voice.Just realized the voice call function of panel computer thus.
Compared with prior art; The advantage and the good effect of the utility model are: the utility model to mobile internet device such as panel computer based on the Hardware platform design voicefrequency circuit; On the basis that does not increase the products-hardware cost, realized the voice call function of this series products; Make the panel computer product really become the end product of multiple consumer electronics products such as integrating PC, smart mobile phone, multimedia player, game machine thus; Make the user can put down mobile phone, only carry a panel computer and go out and get final product, for user's daily life brings great convenience.
Description of drawings
Fig. 1 is the schematic block circuit diagram of a kind of embodiment of the voicefrequency circuit with voice call function that proposes of the utility model;
Fig. 2 is the circuit theory diagrams of a kind of embodiment of the parallel output channel of the audio frequency of main microphone;
Fig. 3 is the circuit theory diagrams of a kind of embodiment of the parallel output channel of the audio frequency of ear microphone.
Embodiment
Describe in detail below in conjunction with the embodiment of accompanying drawing the utility model.
The utility model considers that in fact the modulation module (being the MODEM module) that is used for mobile internet device MID such as panel computer is exactly a radio-frequency receiving-transmitting processing module that is similar to the mobile phone hardware platform, can support all functions of mobile phone hardware platform fully.And the main control chip among the MID is again a powerful multimedia processor; If the two is combined mutual, the collaborative work of carrying out some instructions; Then only need on the existing hardware platform base of MID product, to carry out some simple line design, can realize a kind of voicefrequency circuit hardware scheme, cooperate corresponding software change again with voice call function; Can make the MID product possess voice call function, and then the replacement mobile phone become a kind of mobile communication product.
Be example below with the panel computer, come to set forth in detail the concrete establishment structure and the principle of work thereof of voicefrequency circuit through a concrete embodiment with voice call function.
Embodiment one, and the voice call circuit of present embodiment is divided into uplink and downlink two parts.Wherein, uplink is after the voice that this machine user sends are picked up through microphone and are converted into analog electrical signal, to carry out analog to digital conversion, coding, modulation treatment successively, launches through radio circuit at last.Downlink then is after the other side's voice signal that antenna receives is passed through down coversion, demodulation, decoding processing, is converted into the voice signal of simulation, and finally loudspeaker or the earphone through this machine plays back, and realizes answering of this machine user.
Below in conjunction with theory diagram shown in Figure 1, respectively the circuit implementation of uplink and downlink is specifically introduced.
One, the realization of uplink
Consider present most of panel computer products, himself often possesses sound-recording function, therefore, all can dispose microphone on the body of panel computer or on the external ear speaker device.If sound-recording function uses different microphones respectively with call function, the hardware cost that certainly will will increase product so present embodiment preferably adopts the microphone that has disposed on the panel computer to pick up user speech, is transmitted to the other side via uplink.
In the present embodiment, said microphone can be arranged on the main microphone on the panel computer body, also can be arranged on the ear microphone on the earphone.During conversation; No matter which microphone the user selects to use pick up voice signal; The voice signal that picks up through main microphone or ear microphone is after converting analog electrical signal to via microphone; All need transfer in the conversation codec and carry out the conversion of simulating signal, referring to shown in Figure 1 to digital signal.After the digital signal that the conversation codec generates conversion is carried out voice coding, export baseband chip to and carry out signal modulation process, transfer to then after RF transmit-receive circuit carries out upconversion process, just can be transmitted to the other side, realize call function through antenna.
In order to keep the sound-recording function of panel computer; Speech simulation electric signal through microphone output is carried out the two-way expansion; Promptly adopt the parallelly connected way of output that the analog electrical signal of microphone conversion output is transferred to the conversation codec on the one hand; Send to the other side via uplink, realize call function; On the other hand; Be transferred to audio codec and change into pulse code modulation (PCM) PCM signal, be sent to the main control chip of panel computer, and then under the control action of main control chip; In the storer that said PCM signal is deposited into main control chip is connected, thereby realize sound-recording function.
Said sound-recording function both can be when the user converses, to start, and the dialog context of both call sides was recorded being used for; Also can carry out separately, merely carry out recording operation.As for the recording operation of adopting which kind of type; Can pass through the main control chip generation control signal corresponding of panel computer according to user's selection; Through this control signal each electron device in the uplink is enabled control, and then respond user's recording operation exactly.
Respectively the physical circuit of the parallel output channel of audio frequency of parallel output channel of the audio frequency of main microphone and ear microphone is set up structure below in conjunction with Fig. 2, Fig. 3 and carry out detailed explanation.
Fig. 2 is the audio frequency and the line output circuit of main microphone, and present embodiment is that the differential signal form is that example describes with the speech simulation electric signal that generates through main microphone conversion.Transfer to one group of sub-MICN of difference audio input end, the MICP of one group of sub-M_MICN of difference audio input end, M_MICP and audio codec of conversation codec respectively via a pair of differential signal line through the analog electrical signal of main wheat wind output.On said differential signal line, be connected with voltage dependent resistor (VDR), low-pass filter and capacitance respectively.Wherein, voltage dependent resistor (VDR) RV1, RV2 are connected and the lead-out terminal MIC-of main microphone, a side of the direct-connected differential signal line of MIC+, and voltage dependent resistor (VDR) RV1 is connected between negative polarity signal wire and the ground; Voltage dependent resistor (VDR) RV2 is connected between positive signal line and the ground.Utilize said voltage dependent resistor (VDR) RV1, RV2 can the surge current of introducing via main microphone effectively be suppressed, make its ground of releasing rapidly, to guarantee circuit safety.Can further cross-over connection capacitor C 1 between said differential signal line, to be used for eliminating the differential mode noise of circuit, improve speech quality.Among Fig. 2, inductance L 1 constitutes low-pass filter with capacitor C 2, is connected on the negative polarity signal wire; Inductance L 2 constitutes another low-pass filter with capacitor C 3, is connected on the positive signal line.After analog electrical signal through the output of main microphone falls high frequency interference wherein via low pass filter filters out; Transfer to the conversation codec through capacitance C4, the C5 that is connected in the differential signal line respectively; Capacitance C6, C7 through being connected in the differential signal line transfer to audio codec, to be used for isolating out the flip-flop of speech simulation electric signal.
For the required dc offset voltage MIC_BIAS of main microphone, can be applied on the described positive signal line via resistance R 2, as shown in Figure 2, wherein, capacitor C 8, C9 are used for described dc offset voltage MIC_BIAS is carried out Filtering Processing.In order to make the impedance on the differential signal line reach balance, present embodiment selects the resistance resistance R 1 identical with R2 to be connected between negative polarity signal wire and the ground, with the electric energy on balanced differential signal wire both sides.
Fig. 3 is the audio frequency and the line output circuit of ear microphone, owing to be generally single-ended signal through the analog electrical signal of ear microphone output, and the audio frequency receiving cable of conversation codec and audio codec is often based on the differential signal communication mode.Therefore; For the signal that satisfies conversation codec and audio codec receives requirement; Avoid introducing common mode interference; A single-ended signal line HP_MIC and an other signal wire through resistance R 3 ground connection that present embodiment will connect ear microphone constitute a pair of differential signal line, and then realize respectively transmitting with the voice signal of said conversation codec and audio codec with false differential mode.
Among Fig. 3, the single-ended signal line HP_MIC that connects ear microphone at first passes through voltage dependent resistor (VDR) RV3 ground connection, the surge current in the circuit of releasing as the positive signal line in the false differential signal line; Connect the low-pass filter of forming by inductance L 3 and capacitor C 15 then, to be used for filtering out the high frequency interference of voice signal; Then, said false differential signal line is divided into parallel two-way, the one tunnel is connected to other one group of sub-M_HP_MICN of difference audio input end, the M_HP_MICP of conversation codec respectively through capacitance C11, the C12 of series connection; Another road is connected to other one group of sub-HP_MICN of difference audio input end, the HP_MICP of audio codec respectively through capacitance C13, the C14 of series connection, to realize the accurate reception to voice signal of conversation codec and audio codec.Between the parallel differential signal line of two-way, can distinguish capacitor C 10 of cross-over connection, C15,, improve speech quality to be used to eliminate differential mode noise.
Certainly, also can adopt other multiple design proposals for the voice band line design of main microphone and ear microphone, present embodiment be not limited in above for example.
In addition; In the pcb board design of panel computer; Preferably the parallel outlet line of audio frequency of Fig. 2, the parallel outlet line of main microphone audio shown in Figure 3 and ear microphone is done strict bag ground processing; For example the parallel outlet line of the audio frequency of main microphone and ear microphone is laid in the signals layer of pcb board, and will be close to the two-layer stratum that is designed to up and down of said signals layer, disturb with shielding.In addition, for the signal wire preferred design of the transmitting audio signal line that becomes band, track lengths is short as far as possible, serious decay in long Distance Transmission process, occurs to avoid little simulating signal.
Two, the realization of downlink
Consider that panel computer itself also has the voice playing function, can play the sound source signal of preserving in its storer.If playing back music is inequality with the path of playing call voice, then need use two cover loudspeakers and ear speaker device playing back music and voice signal respectively, this will increase the hardware cost of product.Therefore, present embodiment is preferably realized the broadcast output to call voice by existing audio playing circuit in the panel computer.Its circuit design scheme is: the codec of will conversing is connected with audio codec; A monophonic signal line in the preferred utilization conversation codec connects described audio codec; For example adopt in the conversation codec an earphone signal line---earphone right-channel signals line HPH_R connects described audio codec; And, output to loudspeaker or earphone end after voice signal amplified by the channel selector switch (for example Bypass switch) and the gain control of audio codec inside.
When the user uses panel computer as mobile phone; When conversing with the other side; After comprising the antenna reception of high-frequency signal by panel computer of the other side's voice messaging; After carrying out down coversion and demodulation process through RF transmit-receive circuit, send into baseband chip and carry out corresponding signal decoding, after the voice signal that obtains the PCM form becomes simulating signal via the conversation codec conversion; Through earphone right-channel signals line HPH_R after capacitance filters out flip-flop wherein; Be input to audio codec, and then utilize the inner Bypass switch (switch that is equivalent to a single-pole double-throw (SPDT)) of audio codec that the other side's voice that receive are switched to the earphone end, export through headset earpiece; Perhaps switch to the loudspeaker end,, and then realize user's answering call voice through the loudspeaker output of disposing on the panel computer.
Because the voice signal to audio codec through the output of conversation codec is lower-powered simulating signal, this signal will also be wanted to switch to powerful loudspeaker output through low power earphone output on the one hand on the other hand.Therefore, in audio codec, need do corresponding software gain adaptation, the voice signal after adaptive drives loudspeaker plays and comes out after carrying out power amplification and handle through audio-frequency power amplifier again.
In addition; For the sound source signals of preserving in the storer such as music, the main control chip that can pass through panel computer is input in the audio codec, and this sound source signal can be the digital signal of PCM form; Convert simulating signal to via audio codec; And after carrying out a series of gain and effect process, select to realize music playback function through earphone or loudspeaker output.
Certainly, the voicefrequency circuit design that present embodiment proposed not only can be applied in the panel computer product, same being suitable for for other do not have the MID equipment of voice call function, and present embodiment does not specifically limit this.
Should be noted that; The above only is a kind of preferred implementation of the utility model; For those skilled in the art; Under the prerequisite that does not break away from the utility model principle, can also make some improvement and retouching, these improvement and retouching also should be regarded as the protection domain of the utility model.
Claims (10)
1. the voicefrequency circuit with voice call function comprises microphone, earphone and loudspeaker; It is characterized in that: said microphone picks up voice signal and changes into analog electrical signal and exports the conversation codec to; Go forward side by side behind the lang sound coding to convert digital signal to; Transfer to after baseband chip modulates and export to RF transmit-receive circuit and carry out upconversion process, launch through antenna; Said conversation codec connects audio codec; Transfer to after audio codec carries out channel selecting receiving the other side's voice signal of handling back output via RF transmit-receive circuit and baseband chip successively, through headset earpiece or loudspeaker output the other side voice.
2. the voicefrequency circuit with voice call function according to claim 1; It is characterized in that: said microphone comprises main microphone and ear microphone; The voice signal that picks up through main microphone or ear microphone transfers to audio codec; After converting pulse code modulation signal to, transfer to storer via main control chip and preserve.
3. the voicefrequency circuit with voice call function according to claim 2; It is characterized in that: said main microphone is connected with described conversation codec is corresponding with audio coder & decoder (codec) respectively through a pair of differential signal line; Cross-over connection is useful on the electric capacity of eliminating differential mode noise between described differential signal line; On each signal line, be connected with a low-pass filter separately; The speech simulation electric signal of handling output through said electric capacity and low-pass filter transfers to described conversation codec through capacitance on the one hand, transfers to described audio coder & decoder (codec) through capacitance on the other hand.
4. the voicefrequency circuit with voice call function according to claim 3; It is characterized in that: in said differential signal line; The positive signal line connects dc offset voltage through a resistance, and the negative polarity signal wire is through another resistance eutral grounding, and the resistance of two resistance equates.
5. the voicefrequency circuit with voice call function according to claim 3 is characterized in that: described differential signal line is separately through a voltage dependent resistor (VDR) ground connection.
6. the voicefrequency circuit with voice call function according to claim 2; It is characterized in that: the single-ended audio signal wire of said ear microphone and the signal wire through resistance eutral grounding constitute a pair of differential signal line; Respectively with sub corresponding connection of the difference audio input end of conversation codec and audio codec; On each signal line that connects said difference audio input end, all be in series with capacitance, all cross-over connection has differential mode noise to suppress electric capacity between a pair of differential signal line that connects each group difference audio input end.
7. the voicefrequency circuit with voice call function according to claim 6 is characterized in that: on the single-ended audio signal wire of said ear microphone, be connected with voltage dependent resistor (VDR) and low-pass filter.
8. according to each described voicefrequency circuit in the claim 1 to 7 with voice call function; It is characterized in that: the audio signal wire of said microphone connection conversation codec and audio codec is laid in the signals layer of pcb board, and said signals layer is between two stratum.
9. according to each described voicefrequency circuit in the claim 1 to 7 with voice call function; It is characterized in that: said conversation codec transfers to described audio codec through the monophonic signal line after converting the other side's voice signal that receives to analog electrical signal; Said audio codec connects described loudspeaker through audio-frequency power amplifier.
10. a panel computer comprises main control chip, baseband chip, RF transmit-receive circuit, conversation codec, audio codec and storer; It is characterized in that: also comprise like the described voicefrequency circuit of each claim in the claim 1 to 9 with voice call function.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220052323 CN202583943U (en) | 2012-02-17 | 2012-02-17 | Audio circuit and tablet computer with voice function |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201220052323 CN202583943U (en) | 2012-02-17 | 2012-02-17 | Audio circuit and tablet computer with voice function |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105979438A (en) * | 2016-05-30 | 2016-09-28 | 歌尔股份有限公司 | Wind noise-prevention microphone single body and earphone |
| CN107820160A (en) * | 2017-09-30 | 2018-03-20 | 深圳市艾特智能科技有限公司 | Signal input circuit |
| CN109189234A (en) * | 2018-10-11 | 2019-01-11 | 东莞市大小电子科技有限公司 | A kind of mechanical keyboard with audio input and output function |
| CN111128207A (en) * | 2019-12-31 | 2020-05-08 | 陕西烽火电子股份有限公司 | Self-listening and self-loop calling box and calling method thereof |
| CN111836166A (en) * | 2020-06-16 | 2020-10-27 | 钟杰东 | Integrated audio system of mobile communication terminal |
-
2012
- 2012-02-17 CN CN 201220052323 patent/CN202583943U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105979438A (en) * | 2016-05-30 | 2016-09-28 | 歌尔股份有限公司 | Wind noise-prevention microphone single body and earphone |
| CN107820160A (en) * | 2017-09-30 | 2018-03-20 | 深圳市艾特智能科技有限公司 | Signal input circuit |
| CN109189234A (en) * | 2018-10-11 | 2019-01-11 | 东莞市大小电子科技有限公司 | A kind of mechanical keyboard with audio input and output function |
| CN111128207A (en) * | 2019-12-31 | 2020-05-08 | 陕西烽火电子股份有限公司 | Self-listening and self-loop calling box and calling method thereof |
| CN111128207B (en) * | 2019-12-31 | 2022-08-16 | 陕西烽火电子股份有限公司 | Self-listening and self-loop calling box and calling method thereof |
| CN111836166A (en) * | 2020-06-16 | 2020-10-27 | 钟杰东 | Integrated audio system of mobile communication terminal |
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