CN204190934U - The voicefrequency circuit that a kind of power output is adjustable on a large scale and acoustic product - Google Patents
The voicefrequency circuit that a kind of power output is adjustable on a large scale and acoustic product Download PDFInfo
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- CN204190934U CN204190934U CN201420710116.XU CN201420710116U CN204190934U CN 204190934 U CN204190934 U CN 204190934U CN 201420710116 U CN201420710116 U CN 201420710116U CN 204190934 U CN204190934 U CN 204190934U
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Abstract
The utility model discloses the adjustable voicefrequency circuit of a kind of power output and acoustic product on a large scale, comprise gain class selection circuit, supply power voltage regulating circuit and audio power amplifier circuit; Described gain class selection circuit for generation of and export the gain signal of different stage; Described supply power voltage regulating circuit for generation of and export the supply power voltage of different amplitude; Described audio power amplifier circuit is used for received audio signal, and connect described gain class selection circuit and supply power voltage regulating circuit respectively, after power amplification being carried out to described audio signal according to the gain signal received and/or supply power voltage, promote loud speaker sounding.The utility model adopts gain-adjusted and supply power voltage to regulate two kinds of modes to carry out comprehensive adjustment to the power output of audio frequency power amplifier, expand the adjustable range of sound output thus, make can drive more eurypalynous loud speaker with a acoustic product, thus meet the different application demand of consumers in general better.
Description
Technical field
The utility model belongs to acoustic product technical field, specifically, relates to a kind of audio power that can export acoustic category electronic product and realizes the circuit design that regulates and acoustic product on a large scale.
Background technology
For the acoustic category electronic product at present with audio output function, particularly as the hand-held class acoustic product of this kind of miniaturizations such as mobile phone, palmtop PC, walkman, the gain of the audio frequency power amplifier that its inside uses is all fixing, even if some audio frequency power amplifier has gain-adjusted function, but its adjustable scope is also very limited.Therefore, the audio frequency power amplifier of this kind of acoustic product can only drive earphone or be laid in the small-power loud speaker output audio signal in the machine, loud speaker that cannot be larger to external power realizes Direct driver, which limits the application of such acoustic product at some special occasions, the different application demand of different consumer cannot be met better.
Summary of the invention
The voicefrequency circuit that the purpose of this utility model is to provide a kind of sound output adjustable on a large scale and acoustic product, by carrying out comprehensive adjustment to the gain of audio frequency power amplifier and supply power voltage, thus expand the adjustable range of the power output of audio frequency power amplifier, the different driving requirement of multiple loud speaker can be met.
For solving the problems of the technologies described above, the utility model is achieved by the following technical solutions:
The voicefrequency circuit that power output is adjustable on a large scale, is provided with:
Gain class selection circuit, for generation of the gain signal with output different stage;
Supply power voltage regulating circuit, for generation of the supply power voltage with the different amplitude of output;
Audio power amplifier circuit, for received audio signal, and connect the output of described gain class selection circuit and the output of supply power voltage regulating circuit respectively, after power amplification being carried out to described audio signal according to the gain signal received and/or supply power voltage, promote loud speaker sounding.
When selecting manual mode to regulate the power output of audio frequency power amplifier, key circuit can be arranged through connect described gain class selection circuit and the gain-adjusted key of the rank of the gain signal regulating described gain class selection circuit to export in described voicefrequency circuit, and connect described supply power voltage regulating circuit by key circuit and the supply power voltage adjusting key of the amplitude of the supply power voltage regulating described supply power voltage regulating circuit to export.
When selecting automated manner to regulate the power output of audio frequency power amplifier, can a current/voltage testing circuit be set in described voicefrequency circuit, the electric current of the audio signal exported by audio power amplifier circuit or voltage are detected, and generate corresponding detection signal, for the rank that regulates the gain signal being produced by described gain class selection circuit and export and the amplitude of supply power voltage being produced by described supply power voltage regulating circuit and export.
Preferably, be provided with N way switch element in described gain class selection circuit, by controlling described N way switch element break-make, to generate the gain signal of N way switch amount, correspondence transfers to N number of gain pin of audio power amplifier circuit, carries out 2 to audio power amplifier circuit
nthe gain-adjusted of individual rank; Described N is positive integer.
As a kind of preferred circuit design of described supply power voltage regulating circuit, battery and M road booster circuit is provided with in described supply power voltage regulating circuit, the input of described M road booster circuit connects battery, after carrying out boosting inverter, exports the supply power voltage of different amplitude to cell voltage; Supply power voltage by battery or a wherein road booster circuit output is transferred to the energization pins of audio power amplifier circuit, to regulate the amplitude of the supply power voltage being input to audio power amplifier circuit; Described M is positive integer.
In order to ensure the correct flow direction of supply current, the output of described battery and M road booster circuit is connected the energization pins of described audio power amplifier circuit each via the anti-back biased diode connected in a road.
As another preferred circuit teaming method of described supply power voltage regulating circuit, battery and the adjustable booster circuit of a road output voltage is provided with in described supply power voltage regulating circuit, the input of described booster circuit connects battery, output connects the adjustable resistor voltage divider circuit of resistance, the divider node of described resistor voltage divider circuit connects the feedback end of booster circuit, the amplitude of the supply power voltage exported by booster circuit with change by the resistance of divider resistance in regulating resistance bleeder circuit; The supply power voltage exported by battery and the supply power voltage exported by booster circuit separately via an anti-reverse-biased diode selection wherein a road supply power voltage transfer to the energization pins of audio power amplifier circuit.
Preferably, the audio signal that described audio power amplifier circuit receives is difference audio signal, after converting single-ended audio signal to by audio power amplifier circuit, via the inductive transmission of connecting to loudspeeaker connector; Described loudspeeaker connector comprises for the earphone speaker of grafting earphone and the connector for the external sound equipment of grafting.
Further, in described voicefrequency circuit, be also provided with audio processing chip, output audio signal is to described audio power amplifier circuit, and the volume of the audio signal regulating it to export according to the volume adjustment signals received.
Based on the voicefrequency circuit that above-mentioned power output is adjustable on a large scale, the utility model additionally provides a kind of acoustic product adopting described voicefrequency circuit to design, and comprises gain class selection circuit, supply power voltage regulating circuit and audio power amplifier circuit; Described gain class selection circuit is for generation of the gain signal with output different stage; Described supply power voltage regulating circuit is for generation of the supply power voltage with the different amplitude of output; Described audio power amplifier circuit is used for received audio signal, and connect the output of described gain class selection circuit and the output of supply power voltage regulating circuit respectively, after power amplification being carried out to described audio signal according to the gain signal received and/or supply power voltage, promote loud speaker sounding.
Compared with prior art, advantage of the present utility model and good effect are: the utility model adopts gain-adjusted and supply power voltage to regulate two kinds of modes to carry out comprehensive adjustment to the power output of audio frequency power amplifier, expand the adjustable range of sound output thus, make can drive more eurypalynous loud speaker with a acoustic product, thus expanded the suitable application area of such acoustic product, the different application demand of consumers in general can be met better.In addition, acoustic product of the present utility model can detect the audio signal whether distortion that audio frequency power amplifier exports automatically, and according to the power output of testing result automatic regulating audio power amplifier, solve the blindness existing for user's manual adjustments thus, convenient for users to use.
After reading the detailed description of the utility model execution mode by reference to the accompanying drawings, other features of the present utility model and advantage will become clearly.
Accompanying drawing explanation
Fig. 1 is the schematic block circuit diagram of a kind of embodiment of the adjustable on a large scale voicefrequency circuit of sound output that the utility model proposes;
Fig. 2 is the circuit theory diagrams of a kind of embodiment of the adjustable on a large scale voicefrequency circuit of sound output that the utility model proposes;
Fig. 3 is the circuit theory diagrams of a kind of embodiment of supply power voltage regulating circuit in Fig. 1.
Embodiment
Below in conjunction with accompanying drawing, embodiment of the present utility model is described in more detail.
The acoustic product of the present embodiment is in order to drive more eurypalynous loud speaker playing audio signal, the internal circuit board of acoustic product devises and a set ofly can realize the adjustable voicefrequency circuit of power output on a large scale, shown in Figure 2, comprise the chief components such as gain class selection circuit, supply power voltage regulating circuit and audio power amplifier circuit (such as audio-frequency power amplifier).Wherein, gain class selection circuit is for generation of the gain signal of different stage; Supply power voltage regulating circuit is for generation of the supply power voltage of different stage; The audio signal that audio power amplifier circuit reception source of sound or audio processing chip (for the acoustic product being built-in with audio processing chip) export, and according to the gain rank selected and/or supply power voltage, after power amplification process is carried out to the audio signal received, drive the machine or external speaker sounding, playing audio signal.
Driving power needed for different loud speakers is different, in order to enable the voicefrequency circuit of the present embodiment drive more eurypalynous loud speaker, needs the adjustable range of the power output to audio power amplifier circuit to expand.In order to regulate the power output of audio power amplifier circuit, the mode that the present embodiment adopts the gain of adjustment audio power amplifier circuit (hereinafter referred to as audio frequency power amplifier) and supply power voltage to combine realizes the adjustment on a large scale to audio frequency power amplifier power output.
In order to realize the adjustment as required to sound output, a kind of design is manual adjustments mode, and another kind of design is automatic regulative mode.
When selecting manual adjustments mode, gain-adjusted key (or knob) and supply power voltage adjusting key (or knob) can be set up on the acoustic product being built-in with described voicefrequency circuit, described gain-adjusted key and supply power voltage adjusting key are connected to a controller by key circuit.Described controller detects the mode of operation of gain-adjusted key and supply power voltage adjusting key by key circuit, and then generates corresponding gain control signal and the output of supply power voltage switching signal.Gain control signal for controller output can transfer to the gain pin of audio frequency power amplifier by gain class selection circuit, for adjusting the gain of audio frequency power amplifier; The supply power voltage conditioning signal exported for controller then can transfer to supply power voltage regulating circuit, the supply power voltage exporting different amplitude is switched to control supply power voltage regulating circuit, transfer to the energization pins of audio frequency power amplifier, adjusted the power output of audio frequency power amplifier by the supply power voltage changing audio frequency power amplifier.
When user selects a loud speaker to be connected on described acoustic product, can according to the gain-adjusted key on the driving power adjustment acoustic product of described loud speaker and/or supply power voltage adjusting key.If the driving requirement to this loud speaker can be met by the gain increasing audio frequency power amplifier, then only can regulate the power output of audio frequency power amplifier by actual gain adjusting key.If by gain-adjusted to maximum, still can not meet the driving requirement to this loud speaker, then can adopt the mode of operation power voltage-regulation key, by increasing the supply power voltage being input to audio frequency power amplifier, increase the power output of audio frequency power amplifier, to meet the driving requirement to this loud speaker.Certainly, user also can adopt and regulate the mode of gain-adjusted key and supply power voltage adjusting key to adjust the power output of audio frequency power amplifier, to reaching the driving requirement to this loud speaker simultaneously.
When selecting automatic regulative mode, can by detecting the audio signal whether distortion that audio frequency power amplifier exports, indirectly judge whether the current power output of audio frequency power amplifier can meet the driving requirement of loud speaker.If distortion, then represent that the driving force of audio frequency power amplifier to current selected loud speaker is not enough, need the power output increasing audio frequency power amplifier; If undistorted, without the need to adjusting.
Consider that audio signal is a kind of AC signal, when audio frequency exports normal, the electric current of the audio signal exported by audio frequency power amplifier and voltage are fluctuations; And when there is problem of dtmf distortion DTMF, the electric current exported by audio frequency power amplifier and voltage are constant.Therefore, whether can be changed by the electric current or voltage detecting audio frequency power amplifier output, indirectly judge whether the audio signal exported by audio frequency power amplifier occurs problem of dtmf distortion DTMF.
To achieve these goals, the present embodiment arranges current/voltage testing circuit further in voicefrequency circuit, as shown in Figure 1, connect the output of audio frequency power amplifier, detect for the electric current I of audio signal that exports audio frequency power amplifier or voltage V, and generate corresponding detection signal, export described controller to.Described controller judges according to the detection signal received whether the electric current I of the audio signal exported by audio frequency power amplifier or voltage V are changed, when detecting that described electric current I or voltage V do not change within the time period of setting, namely described electric current I and voltage V are within the time period of setting, its excursion does not exceed the allowable fluctuation range of setting, then judge the audio signal distortion exported by described audio frequency power amplifier, need to adjust the power output of audio frequency power amplifier, to meet the driving requirement of current selected loud speaker.Wherein, described controller is formed after being integrated in a control chip inside primarily of gain class selection circuit, power circuit and supply power voltage regulating circuit, can export the supply power voltage of cell voltage and other amplitudes.
The controller of the present embodiment in the process that the power output of audio frequency power amplifier is regulated, employing be that gain-adjusted and supply power voltage regulate the mode combined, concrete adjustment process is as follows:
When controller detects audio distortion, first regulate the gain control signal that it exports, to increase the gain of audio frequency power amplifier; If by the gain increasing audio frequency power amplifier, i.e. its audio signal no longer distortion exported of adjustable, then by adjustment gain, can meet the driving requirement to current speaker, now just can stop adjustment process;
If controller by the Gain tuning of audio frequency power amplifier to time maximum, the still problem of unresolved audio distortion, then first controller reduces the gain of audio frequency power amplifier, then the supply power voltage switching signal that it exports is changed, control the amplitude that supply power voltage regulating circuit increases the supply power voltage that it exports, and then will the supply power voltage elevated by one step of audio frequency power amplifier be input to, to increase the power output of audio frequency power amplifier.If now, audio signal is distortion no longer, then can terminate adjustment process; If still distortion, then on the basis of the supply power voltage of this rank, again adopt the power output adjusting the mode of gain to increase audio frequency power amplifier further;
Controller controls supply power voltage regulating circuit and keeps the supply power voltage of current output constant, regulate gain control signal to increase the gain of audio frequency power amplifier step by step, and in the process of gain-adjusted, detect in real time the electric current that exported by audio frequency power amplifier or whether voltage changes, if electric current or voltage normal fluctuation detected, then judge that audio frequency exports normal, exit adjustment process; If by gain-adjusted to maximum still distortion, then need again to adopt the power output regulating the mode of supply power voltage to increase audio frequency power amplifier further;
Now, the gain control signal that controller regulates it to export, the gain of adjustment audio frequency power amplifier, such as the gain of audio frequency power amplifier is down to minimum, then the supply power voltage switching signal that it exports is regulated, control the amplitude that supply power voltage regulating circuit increases the supply power voltage that it exports again, will the supply power voltage elevated by one step again of audio frequency power amplifier be input to, to increase the power output of audio frequency power amplifier further;
By that analogy, controller adopts and first regulates gain to regulate the mode of supply power voltage again, and the power output controlling audio frequency power amplifier progressively increases, until meet the driving requirement of current selected loud speaker, till promoting the normal sounding of loud speaker.
Certainly, the power output of audio frequency power amplifier is not infinitely to increase, the supply power voltage that described controller is input to audio frequency power amplifier in adjustment reaches highest level, and the gain-adjusted of audio frequency power amplifier is to time maximum, the audio signal still distortion exported by audio frequency power amplifier if detect, then represent the driving force scope beyond current acoustic product.When this happens, for the acoustic product being built-in with audio processing chip, controller output volume adjusting signal can be passed through, transfer to audio processing chip, to control the volume that audio processing chip reduces the audio signal that it exports, to making the audio signal no longer distortion exported by described audio frequency power amplifier.
(can judge whether user has changed loud speaker by the plug state detecting loudspeeaker connector upper speaker) when user changes loud speaker, in order to reduce system power dissipation, extend the cruising time of acoustic product, the present embodiment decision design controller is when detecting for driving the loud speaker of sounding to change, first the supply power voltage being input to audio frequency power amplifier is adjusted to minimum rank, namely the one-level supply power voltage that amplitude is minimum, and by the gain-adjusted of audio frequency power amplifier to default level.Described default level can according to acoustic product when using usual loud speaker (described usual loud speaker refers to the loud speaker that the acquiescence loud speaker of Operation system setting or user in use the most often use) sounding, meeting volume adjusting under the distortionless condition of the audio signal exported by audio frequency power amplifier during maximum, corresponding gain rank is determined.
For the acoustic product adopting small-capacity cells to power, when the power output required by the loud speaker that user selects is less, directly can use powered battery, the utilance of smaller battery capacity can be maximized like this.And when requiring larger power output, being then switched to the supply power voltage that should be able to meet the minimal level that driving requires mutually powers to audio frequency power amplifier, with control system energy consumption of trying one's best.Simultaneously, consider when acoustic product drives supersound projector sounding, electric quantity consumption is larger, in order to ensure that user can long-time continuous listening to audio signal, the present embodiment designs described controller when the power output of audio frequency power amplifier is larger, automatically generates information, the display screen transferred on acoustic product shows, plug charger as early as possible to point out user to charge to battery, this addresses the problem battery capacity smaller, but will drive the contradiction of larger audio frequency power amplifier.
In order to realize controlling exactly to the gain of audio frequency power amplifier and supply power voltage, the present embodiment proposes the assembling structure of supply power voltage regulating circuit as shown in Figure 2 and gain class selection circuit.Wherein, gain class selection circuit for generation of with selection gain rank, specifically can be connected to described controller, receive the gain control signal that controller exports, and transfer to the gain pin of audio power amplifier circuit, to regulate the gain rank of audio power amplifier circuit.
In order to realize the multistage adjustment of the gain of audio frequency power amplifier, can CONTROLLER DESIGN output multi-channel gain control signal, such as N road, described N is positive integer, and arranges N way switch element in described gain class selection circuit.The N road gain control signal exported by described controller transfers to the control pole of N way switch element correspondingly, by controlling described N way switch element break-make, to generate N road high level or low level on-off model, and then correspondence transfers to N number of gain pin of audio frequency power amplifier, can realize 2 thus to audio frequency power amplifier
nthe gain-adjusted of individual rank.
The present embodiment is described to realize level Four gain-adjusted, i.e. N=2, then need controller to export two-way gain control signal GAIN_CONTROL1 and GAIN_CONTROL2, as shown in Figure 2.Described two-way gain control signal GAIN_CONTROL1 and GAIN_CONTROL2 correspondence are transferred to double switch element, is described as described switch element for NPN type triode Q1, Q5.Gain control signal GAIN_CONTROL1 or GAIN_CONTROL2 described in being received by the base stage of triode Q1, Q5, and by the base stage of triode Q1, Q5 respectively by pull down resistor R4, R2 ground connection.By the grounded emitter of triode Q1, Q5, collector electrode connects DC power supply VCC respectively by pull-up resistor R6 or R3, and connects one to one with two gain pins G1, G0 of audio frequency power amplifier U1 respectively.
Adopt this circuit design, the low and high level state of gain control signal GAIN_CONTROL1 and GAIN_CONTROL2 exported by controller is just reverse to the level state of corresponding gain pin G1, G0 of transferring to audio frequency power amplifier U1, by regulating the level state being input to gain pin G1, G0 to be 00,01,10,11, thus realize regulating the level Four of the gain of audio frequency power amplifier U1.
Certainly, audio frequency power amplifier U1 is had to the situation of more multichannel gain pin, then can configure more variable connector element transmission more multichannel gain control signal, to realize more multistage gain-adjusted to audio frequency power amplifier U1.
It should be noted that: for described switch element, also can adopt other components and parts with on-off action such as metal-oxide-semiconductor, controllable silicon replace described NPN type triode Q1, Q5 design described in gain control circuit.Such as: when adopting N-channel MOS pipe to replace described NPN type triode Q1, Q5, gain control signal GAIN_CONTROL1 or GAIN_CONTROL2 that described controller sends can be received by the grid of described N-channel MOS pipe, by the source ground of N-channel MOS pipe, drain electrode connects the gain pin of audio frequency power amplifier U1, and connect DC power supply by pull-up resistor, also can realize the gain-adjusted to audio frequency power amplifier U1 thus.
For described supply power voltage regulating circuit, the present embodiment proposes two kinds of preferred electrical architecture designs, shown in Fig. 2, Fig. 3.Wherein a kind of circuit design mode adopts output voltage constant booster circuit in M road to coordinate the battery of acoustic product inside to build to form, and described M is positive integer.Described booster circuit can select boost chip to coordinate simple periphery circuit design to form.When selecting boost chip, the M road boost chip that output voltage amplitude should be selected different, can switch the supply power voltage exporting the different amplitude in M+1 road thus by described supply power voltage regulating circuit.
In order to realize the accurate switching to each road supply power voltage, the supply power voltage switching signal that the present embodiment design is exported by described controller is M road enable signal, respectively enable control is carried out to M road boost chip, and then the supply power voltage by battery or a wherein road boost chip output is transferred to the energization pins VDD of described audio frequency power amplifier U1, to regulate the rank of the supply power voltage being input to audio frequency power amplifier U1.
Be described for M=2.In described supply power voltage regulating circuit, two-way boost chip U2, U3 are set, as shown in Figure 2, two-way enable signal VDD_EN_1, VDD_EN_2 is exported by controller, transfer to the enable pin EN of boost chip U2, U3 respectively via rc filter circuit R5, C4 or R7, C15 correspondence, respectively enable control is carried out to two-way boost chip U2, U3.After the cell voltage VBAT that battery exports is carried out filtering process via filter capacitor C1 or C13 respectively, correspondence transfers to the input VIN of two-way boost chip U2, U3, described boost chip U2, U3 are after receiving effective enable signal VDD_EN_1 or VDD_EN_2, boosting inverter is carried out to the cell voltage VBAT of input, export supply power voltage V2 or V3 of its corresponding amplitude, filtering out interference through filter capacitor C2, C3 or C14, C16 makes an uproar after ripple, transfers to the energization pins VDD of audio frequency power amplifier U1 respectively by anti-back biased diode D2 or D3.Described battery is also connected to the energization pins VDD of audio frequency power amplifier U1 by an anti-back biased diode D1 in road, can provide the supply power voltage of three different stages thus to audio frequency power amplifier U1.
In supply power voltage regulating circuit, designing anti-back biased diode D1, D2, D3, can ensureing when switching to the supply power voltage of different amplitude, the correct flow direction of supply current.
The second supply power voltage regulating circuit design is that output voltage adjustable booster circuit in employing one road coordinates the battery of acoustic product inside to build to form.As shown in Figure 3, the boost chip U4 that described booster circuit preferably adopts output voltage adjustable coordinates simple periphery circuit design to form.The cell voltage VBAT exported by battery BAT is transferred to the input FREQ of boost chip U4, export the supply power voltage V1 after boosting inverter by the output BOOT of boost chip U4.The adjustable resistance pressure-dividing network of resistance is connected at the output BOOT of boost chip U4, the potential-divider network be such as made up of resistance RF1 and RF2, its divider node is connected to the feedback end FB of boost chip U4, by regulating the magnitude of voltage at described divider node place, to change the voltage magnitude exported by boost chip U4.
In order to realize multistage adjustment to the amplitude of the supply power voltage V1 exported by boost chip U4, the supply power voltage switching signal that the present embodiment design is exported by described controller is resistance conditioning signal, changes the amplitude of the supply power voltage V1 exported by boost chip U4 by the resistance of divider resistance RF2 in regulating resistance potential-divider network.Be connected in the circuit of the energization pins VDD of audio frequency power amplifier U1 connect separately a road anti-back biased diode D32, D1 with battery at the output BOOT of boost chip U4, the supply power voltage V1 that the supply power voltage VBAT utilizing described anti-back biased diode D32, D1 gating battery BAT to export or boost chip U4 exports transfers to the energization pins VDD of described audio frequency power amplifier U1, to realize the adjustment to audio frequency power amplifier U1 power output.
Certainly, described supply power voltage regulating circuit also can adopt other circuit teaming methods to design, and the present embodiment is not limited in above citing.
Adopt the supply power voltage regulating circuit teaming method shown in Fig. 2, Fig. 3, the supply power voltage VBAT exported by battery is other supply power voltage of lowermost level, and the supply power voltage exported by boost chip U2, U3, U4 is the supply power voltage of higher level.Controller can, according to required power output, select the supply power voltage switching to wherein a kind of rank to transfer to the energization pins VDD of described audio frequency power amplifier U1.
In the present embodiment, the audio signal exported by described audio processing chip can be a left side for difference form, right channel audio signal SPK_RN, SPK_RP, SPK_LN, SPK_LP, as shown in Figure 2, after the capacitance C5-C7 connected via a road separately isolates out DC component wherein, transfer to the input pin INL-of described audio frequency power amplifier U1, INL+, INR-, INR+, a left side for single-ended format is converted thereof into by audio frequency power amplifier U1, after right channel audio signal, by the output pin OUTL of audio frequency power amplifier U1, OUTR exports the machine loud speaker to, and can via series inductance FB2, FB1 transfers to loudspeeaker connector.In the present embodiment, described loudspeeaker connector can comprise for the earphone speaker CR2 of grafting earphone and the connector CR1 for the external sound equipment of grafting, as shown in Figure 2, more audio frequency can be provided to play approach for user thus, meet the user demand of different user, the satisfaction that user uses is provided.
The present embodiment is by adopting the structural design of above-mentioned voicefrequency circuit and the regulative mode of power output, not only expand the power output adjustable range of audio frequency power amplifier, make the acoustic product being built-in with above-mentioned voicefrequency circuit can require to realize according to the driving of current selected loud speaker the automatic adjustment of its power output, and by effective control system energy consumption, for the hand-held class acoustic product of the battery powered miniaturization of employing, the cruising time of product can be extended as much as possible, solve the worry of user's frequent charge.
Certainly; above-mentioned explanation is not limitation of the present invention; the present invention is also not limited in above-mentioned citing, the change that those skilled in the art make in essential scope of the present invention, remodeling, interpolation or replacement, also should belong to protection scope of the present invention.
Claims (10)
1. the voicefrequency circuit that power output is adjustable on a large scale, is characterized in that, is provided with:
Gain class selection circuit, for generation of the gain signal with output different stage;
Supply power voltage regulating circuit, for generation of the supply power voltage with the different amplitude of output;
Audio power amplifier circuit, for received audio signal, and connect the output of described gain class selection circuit and the output of supply power voltage regulating circuit respectively, after power amplification being carried out to described audio signal according to the gain signal received and/or supply power voltage, promote loud speaker sounding.
2. the voicefrequency circuit that power output according to claim 1 is adjustable on a large scale, it is characterized in that, a current/voltage testing circuit is also provided with in described voicefrequency circuit, the electric current of the audio signal exported by audio power amplifier circuit or voltage are detected, and generate corresponding detection signal, for the rank that regulates the gain signal being produced by described gain class selection circuit and export and the amplitude of supply power voltage being produced by described supply power voltage regulating circuit and export.
3. the voicefrequency circuit that power output according to claim 1 is adjustable on a large scale, it is characterized in that, in described voicefrequency circuit, be also provided with key circuit connect described gain class selection circuit and the gain-adjusted key of the rank of the gain signal regulating described gain class selection circuit to export, and connect described supply power voltage regulating circuit by key circuit and the supply power voltage adjusting key of the amplitude of the supply power voltage regulating described supply power voltage regulating circuit to export.
4. the voicefrequency circuit that power output according to any one of claim 1 to 3 is adjustable on a large scale, it is characterized in that, N way switch element is provided with in described gain class selection circuit, by controlling described N way switch element break-make, to generate the gain signal of N way switch amount, correspondence transfers to N number of gain pin of audio power amplifier circuit, carries out 2 to audio power amplifier circuit
nthe gain-adjusted of individual rank; Described N is positive integer.
5. the voicefrequency circuit that power output according to any one of claim 1 to 3 is adjustable on a large scale, it is characterized in that, battery and M road booster circuit is provided with in described supply power voltage regulating circuit, the input of described M road booster circuit connects battery, after boosting inverter is carried out to cell voltage, export the supply power voltage of different amplitude; Supply power voltage by battery or a wherein road booster circuit output is transferred to the energization pins of audio power amplifier circuit, to regulate the amplitude of the supply power voltage being input to audio power amplifier circuit; Described M is positive integer.
6. the voicefrequency circuit that power output according to claim 5 is adjustable on a large scale, is characterized in that, the output of described battery and M road booster circuit is connected the energization pins of described audio power amplifier circuit each via the anti-back biased diode connected in a road.
7. the voicefrequency circuit that power output according to any one of claim 1 to 3 is adjustable on a large scale, it is characterized in that, battery and the adjustable booster circuit of a road output voltage is provided with in described supply power voltage regulating circuit, the input of described booster circuit connects battery, output connects the adjustable resistor voltage divider circuit of resistance, the divider node of described resistor voltage divider circuit connects the feedback end of booster circuit, the amplitude of the supply power voltage exported by booster circuit with change by the resistance of divider resistance in regulating resistance bleeder circuit; The supply power voltage exported by battery and the supply power voltage exported by booster circuit separately via an anti-reverse-biased diode selection wherein a road supply power voltage transfer to the energization pins of audio power amplifier circuit.
8. the voicefrequency circuit that power output according to any one of claim 1 to 3 is adjustable on a large scale, it is characterized in that, the audio signal that described audio power amplifier circuit receives is difference audio signal, after converting single-ended audio signal to by audio power amplifier circuit, via the inductive transmission of connecting to loudspeeaker connector; Described loudspeeaker connector comprises for the earphone speaker of grafting earphone and the connector for the external sound equipment of grafting.
9. the voicefrequency circuit that power output according to any one of claim 1 to 3 is adjustable on a large scale, it is characterized in that, also audio processing chip is provided with in described voicefrequency circuit, output audio signal is to described audio power amplifier circuit, and the volume of the audio signal regulating it to export according to the volume adjustment signals received.
10. an acoustic product, is characterized in that, is provided with the voicefrequency circuit that power output as claimed in any one of claims 1-9 wherein is adjustable on a large scale.
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| CN201420710116.XU CN204190934U (en) | 2014-11-24 | 2014-11-24 | The voicefrequency circuit that a kind of power output is adjustable on a large scale and acoustic product |
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| CN201420710116.XU CN204190934U (en) | 2014-11-24 | 2014-11-24 | The voicefrequency circuit that a kind of power output is adjustable on a large scale and acoustic product |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105116953A (en) * | 2015-08-20 | 2015-12-02 | 宁波音王电声股份有限公司 | Sound moduler |
| CN105933829A (en) * | 2016-06-14 | 2016-09-07 | 青岛歌尔声学科技有限公司 | Audio control module and audio output device |
| CN106535052A (en) * | 2016-12-30 | 2017-03-22 | 深圳市安耐科电子技术有限公司 | Audio adaption boosting circuit, BOOST chip and audio equipment |
| CN106849002A (en) * | 2017-02-28 | 2017-06-13 | 广东欧珀移动通信有限公司 | Voltage protection circuit and terminal device |
| CN107277683A (en) * | 2016-04-07 | 2017-10-20 | 深圳市三诺数字科技有限公司 | A kind of audio amplifier system and method |
| CN107360496A (en) * | 2017-06-13 | 2017-11-17 | 东南大学 | Can be according to the speaker system and adjusting method of environment automatic regulating volume |
| CN109891911A (en) * | 2016-10-27 | 2019-06-14 | 悠声股份有限公司 | For operating the amplifier unit and sound generation unit of piezoelectric acoustic transducer and/or dynamic sonic transducer |
| CN110445212A (en) * | 2019-08-12 | 2019-11-12 | 杨成波 | A method of control discharge current is exported based on cell voltage clipping regulation power |
| CN111510803A (en) * | 2020-04-22 | 2020-08-07 | 歌尔科技有限公司 | Sound box and sound box system |
-
2014
- 2014-11-24 CN CN201420710116.XU patent/CN204190934U/en not_active Expired - Fee Related
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105116953A (en) * | 2015-08-20 | 2015-12-02 | 宁波音王电声股份有限公司 | Sound moduler |
| CN107277683A (en) * | 2016-04-07 | 2017-10-20 | 深圳市三诺数字科技有限公司 | A kind of audio amplifier system and method |
| CN107277683B (en) * | 2016-04-07 | 2023-07-04 | 深圳市三诺数字科技有限公司 | Audio amplification system and method |
| CN105933829A (en) * | 2016-06-14 | 2016-09-07 | 青岛歌尔声学科技有限公司 | Audio control module and audio output device |
| CN105933829B (en) * | 2016-06-14 | 2019-04-30 | 青岛歌尔声学科技有限公司 | A kind of audio frequency control module and audio output apparatus |
| CN109891911A (en) * | 2016-10-27 | 2019-06-14 | 悠声股份有限公司 | For operating the amplifier unit and sound generation unit of piezoelectric acoustic transducer and/or dynamic sonic transducer |
| US10826445B2 (en) | 2016-10-27 | 2020-11-03 | USound GmbH | Amplifier unit for operating a piezoelectric sound transducer and/or a dynamic sound transducer, and a sound-generating unit |
| CN106535052A (en) * | 2016-12-30 | 2017-03-22 | 深圳市安耐科电子技术有限公司 | Audio adaption boosting circuit, BOOST chip and audio equipment |
| CN106849002A (en) * | 2017-02-28 | 2017-06-13 | 广东欧珀移动通信有限公司 | Voltage protection circuit and terminal device |
| CN107360496A (en) * | 2017-06-13 | 2017-11-17 | 东南大学 | Can be according to the speaker system and adjusting method of environment automatic regulating volume |
| CN110445212A (en) * | 2019-08-12 | 2019-11-12 | 杨成波 | A method of control discharge current is exported based on cell voltage clipping regulation power |
| CN111510803A (en) * | 2020-04-22 | 2020-08-07 | 歌尔科技有限公司 | Sound box and sound box system |
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