CN203761375U - Audio processing device and audio playing equipment - Google Patents
Audio processing device and audio playing equipment Download PDFInfo
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- CN203761375U CN203761375U CN201420176451.6U CN201420176451U CN203761375U CN 203761375 U CN203761375 U CN 203761375U CN 201420176451 U CN201420176451 U CN 201420176451U CN 203761375 U CN203761375 U CN 203761375U
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Abstract
The utility model relates to an audio processing device and audio playing equipment. The audio processing device comprises a master audio controller, a power management unit and a plurality of digital-to-analog converters in at least two models, wherein analog audio signal output ends of the digital-to-analog converters are connected to the same analog audio linear output end; analog audio signal input ends of the digital-to-analog converters are respectively connected with the master audio controller; the power management unit is connected with the master audio controller, and is connected with the digital-to-analog converters through enabled switch groups respectively; the master audio controller is in control connection with the enabled switch groups, so that output electric energy of an MPU (microprocessor unit) which is controlled by an MCU (microprogrammed control unit) can selectively supply power for the digital-to-analog converters (DAC) in the same model, and the digital-to-analog converters (DAC) in the other models are stopped. The audio processing device has the advantages that by using the audio playing equipment with the audio processing device, different analog-to-digital converter (DAC) processing sounds can be heard. Compared with the conventional audio playing equipment, the audio playing equipment has the characteristics that only the types of DAC chips, relevant control circuits and the like are increased, so that the cost is only increased slightly, but functions and properties of the audio playing equipment are greatly improved.
Description
Technical field
The utility model relates to audio frequency play-back technology field, relates in particular to a kind of apparatus for processing audio and audio-frequence player device.
Background technology
At present, various types of audio players and the various electronic equipments with audio playing function device have been widely used in daily life.Described audio player is as MP3 player, CD Player, DVD player and digital audio-frequency player etc.Described various electronic equipments with audio playing function device are as mobile phone, panel computer, desk-top cd machine, external audio decoder, multimedia digital player etc.
Common a audio player, digital audio frequency decoder comprise audio frequency master controller (MCU), memory device (Flash), D/A converting circuit (DAC), analog amplify circuit (AMP) and other must or auxiliary circuit device (as: crystal concussion clock, storage card reader) form.Audio frequency master controller reads the audio file on storage medium (Flash), exports the standard digital audio frequency such as pulse code modulation stream (PCM stream) or direct bit stream digital coding stream (DSD stream) stream after decoding; Or receive standard digital audio frequency stream by digital audio interfaces such as SPDIF-in, USB, then be transferred to D/A converting circuit by the digital audio interface such as IIS, SPDIF-out; Digital audio stream is converted to simulated audio signal by D/A converting circuit, after finally being processed and amplified by analogue audio frequency processing, amplifying circuit (AMP), offers electro-acoustic transducing device (earphone, loud speaker etc.) and complete the playback of sound.
In above-mentioned steps, digital-to-analogue conversion mainly completes by analog-digital chip, and the performance index of DAC are the core keys that determine tonequality.Main flow DAC chip production producer in the market has: Wal good fortune gloomy (Wolfson), Texas Instrument (Texas Instruments), boolean. Blang (Burr Brown), the logic of reaching the clouds (Cirrus Logic), crystal (Crystal), smart section (AKM), analogue device (Analog), Philip (Philips), hundred million generation (ESS) etc.Under these house flags, there is again the DAC chip of numerous models.As a rule, for a DAC chip, except the parameter index of the hardware such as sampling rate, sampling precision, Hz-KHz, dynamic range, snr value, total Harmonic Distortion plus Noise, the difference of its subjective sense of hearing is also very large.For example, conventionally industry can be thought the penetrating exquisiteness of sound of CS4398, and details is abundant, sense of hearing neutrality; PCM1794 parsing power is high, dynamically large, energy sense abundance, and imposing manner is swift and fierce, loose atmosphere; The plain sense of continuity of WM8741 sound is good, sound easily warm, simulation taste strong.These lists cannot embody and compare from chip physical parameter.
Therefore, for user, buy certain a player in the past, the sound style of the player being determined by fixing DAC chip cannot change.
Utility model content
The object of the utility model embodiment is for the structural limitation of prior art, a kind of apparatus for processing audio and audio-frequence player device are proposed, many moneys analog-digital chip is set, and by selecting controlling mechanism, make optionally a kind of digital to analog converter of model power supply wherein of electric energy of Power Management Unit output, now the digital to analog converter of other model quits work, not output audio signal; And in the time selecting unit controls MPU to switch power supply, another DAC chip operation can be heard the sound that different DAC process like this in an audio-frequence player device; And in audio frequency master controller, preset the adjusted value of the level of the DAC output of different model, and adjust the output volume of different DAC by IIC control interface, make it to keep in same system relatively consistent.
In order to reach above-mentioned utility model object, a kind of apparatus for processing audio that first the utility model proposes, is achieved through the following technical solutions:
A kind of apparatus for processing audio, is characterized in that, this device comprises:
Audio frequency master controller, reads digital audio and video signals stream or digital audio file, and is decoded as standard digital audio frequency stream;
Comprise multiple digital to analog converters of at least two kinds of models, for being analog signal by described standard digital audio frequency stream translation; The output of those digital to analog converters is connected on the linear output of same analogue audio frequency, and its digital audio input is connected respectively described audio frequency master controller with function control end;
Power Management Unit, connects described audio frequency master controller, and connects each digital to analog converter by enable switch group respectively;
In addition, described audio frequency main controller controls connects each enable switch group, make the output electric energy of described Power Management Unit under described audio frequency main controller controls, optionally, to a kind of digital to analog converter power supply of model, the digital to analog converter of other model quits work.
In one embodiment, the digital to analog converter that described multiple digital to analog converters are different model.
In another embodiment, in described multiple digital to analog converters, the quantity that has a kind of digital to analog converter of model at least is two, and these two same model digital to analog converters all connect described audio frequency master controller, and carries out digital-to-analogue conversion to one in left and right acoustic channels respectively.
Preferably, the output of described each digital to analog converter is equipped with differential operational amplifier, for the analog differential audio signal of digital to analog converter output is converted to analog linearity output audio signal; Described differential operational amplifier is connected to the linear output of described analogue audio frequency.
Further preferred, described apparatus for processing audio also comprises for reading digital audio and video signals stream that digital audio input interface or storage medium store or the reading unit of digital audio file; This reading unit is encapsulated in audio frequency master controller.
In addition, a kind of audio-frequence player device that the utility model also proposes, is achieved through the following technical solutions:
A kind of audio-frequence player device, comprises aforesaid apparatus for processing audio, and this audio-frequence player device also comprises volume adjustment device and electroacoustic drive output, and described volume adjustment device connects the linear output of described analogue audio frequency; Described apparatus for processing audio and volume adjustment device are located in same casing, and described electroacoustic drive output is located on this casing.
Preferably, described audio-frequence player device is the one in MP3 player, CD Player, DVD player, digital audio-frequency player, mobile phone, panel computer, external audio decoder, multimedia digital player.
Compared with prior art, the beneficial effects of the utility model are: many moneys analog-digital chip is set in circuit, and by selecting controlling mechanism, make optionally a kind of digital to analog converter of model power supply wherein of electric energy of Power Management Unit output, now the digital to analog converter of other model quits work, not output audio signal; And in the time selecting unit controls MPU to switch power supply, another DAC chip operation can be heard the sound that different DAC process like this in an audio-frequence player device; And in audio frequency master controller, preset the adjusted value of the level of the DAC output of different model, and adjust the output volume of different DAC by IIC control interface, make it to keep in same system relatively consistent.Compare conventional audio-frequence player device, for example MP3, because other the electric circuit constitute structure is constant, has only increased kind and the relevant control circuit etc. of DAC chip, and therefore cost does not improve too much, and function and performance greatly improve.
Brief description of the drawings
By the description of its exemplary embodiment being carried out below in conjunction with accompanying drawing, the above-mentioned feature and advantage of the utility model will become apparent and easily understand.
Fig. 1 is the utility model embodiment overall structure schematic diagram;
Fig. 2 is the utility model embodiment circuit detailed structure schematic diagram;
Fig. 3 is the utility model embodiment processing unit workflow schematic diagram.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described in further detail, so that technical staff's of the same trade understanding:
First the present embodiment provides a kind of apparatus for processing audio, shown in Figure 1, and the primary structure of this device consists of:
Audio frequency master controller U1, read digital audio and video signals stream or the digital audio file in that the digital audio interface such as SPDIF-in, USB is inputted or storage medium, stored, and be decoded as the standard digital audio frequency such as pulse code modulation stream (PCM stream) or direct bit stream digital coding stream (DSD stream) stream, then transfer out by the digital audio interface such as IIS, SPDIF-out;
Preferred embodiment, in apparatus for processing audio, also should include flash chip U2, the operating system of storage apparatus for processing audio and the digital audio file that needs to play in flash chip;
Preferred embodiment, also should include digital audio input interface J1 in apparatus for processing audio, digital audio input interface provides needs the digital audio and video signals of playing to flow;
Because above data storage, transmission and reading manner are for those skilled in the art's scheme of commonly seeing, therefore do not repeat them here.
Power Management Unit U3, connects audio frequency master controller U1, and connects each digital to analog converter U4, U5, U6 by enable switch group respectively, for whole apparatus for processing audio provides electric energy;
Digital to analog converter U4, U5 and the U6 of three different models can be independently all simulated audio signal for pulse code modulation is flowed to the standard digital audio frequency stream translation such as (PCM stream) or direct bit stream digital coding stream (DSD stream); It is upper that the output of these digital to analog converters is connected to the linear output J2 of same analogue audio frequency, and its digital audio input is connected respectively described audio frequency master controller U1 with function control end;
The linear output J2 of analogue audio frequency connects power amplification circuit AMP, power amplification circuit AMP for simulated audio signal amplify, after tuning etc. processes, by electroacoustic drive output J3, offer electro-acoustic transducing device (earphone, loud speaker etc.) and complete the playback of sound.
In addition, the each enable switch group of audio frequency master controller U1 control connection, makes the output electric energy of Power Management Unit under described audio frequency main controller controls, and optionally, to a kind of digital to analog converter power supply of model, the digital to analog converter of other model quits work.
In the time that apparatus for processing audio is worked, first Power Management Unit U3 is audio frequency master controller U1 power supply, and U1 completes and controls U3 output electric energy after initialization optionally to a power supply in digital to analog converter U4, U5, U6.
Now, audio frequency master controller U1, read digital audio and video signals stream or the digital audio file in the digital audio such as SPDIF-in, USB input interface J1 or storage medium U2, stored, and be decoded as pulse code modulation stream (PCM stream) or directly the standard digital audio frequency such as bit stream digital coding stream (DSD stream) flow, be transferred to each DAC by the digital audio interface such as IIS, SPDIF-out again, digital audio and video signals is converted to simulated audio signal output by the DAC being powered, and the DAC not being powered does not work, do not export simulated audio signal.
The system framework of apparatus for processing audio is more than provided, has been described for the detailed structure of apparatus for processing audio below in conjunction with Fig. 2:
In the present embodiment, digital to analog converter U4 adopts the WM8741 of the gloomy microelectronics of Wal good fortune (Wolfson); Digital to analog converter U5 adopts Texas Instrument-boolean. Blang's (Burr-Brown Products from TexasInstruments) PCM1792; Digital to analog converter U6 adopts the CS4398 of logic-crystal (CirrusLogic-Crystal) that reach the clouds.
Enable switch group between U4 and Power Management Unit U3 adopts two field effects (MOS) pipe WPM2026, is expressed as Q1 and Q2 in Fig. 2.
Enable switch group between U5 and Power Management Unit U3 adopts two field effect transistor WPM2026, is expressed as Q3 and Q4 in Fig. 2.
Enable switch group between U6 and Power Management Unit U3 adopts a field effect transistor WPM2026, is expressed as Q5 in Fig. 2.
The 16#VDD pin of audio frequency master controller U1 is core power supply, and 15#VCCIO pin is input/output port power supply, and both are with the VCCA(analog electrical that equals Power Management Unit U3)=3.3v.IIS data-interface (bit clock BCLK, frame clock LRCK, serial data SDATA, master clock MCLK) and IIC control interface (by serial data sda line and serial clock scl line) that 1# pin, 2# pin, 3# pin, 4# pin, 5# pin, 6# pin, 7# pin are U1, with IIS and the corresponding connection of IIC interface of analog-digital chip U4, U5 and U6.
GPIO0 pin is quiet control output, when switching on and shutting down, digital to analog converter switching, song switching etc. may have rush of current sound, plays insulating effect.
GPIO1 pin is that part analog-digital chip is needed, resets and controls output.
GPIO2 pin is that analog-digital chip U4 enables to control output, Low level effective, and power ratio control field effect transistor Q1, Q2 conducting, now U4 is in running order;
GPIO3 pin is that analog-digital chip U5 enables to control output, Low level effective, and power ratio control field effect transistor Q3, Q4 conducting, now U5 is in running order;
GPIO4 pin is that analog-digital chip U6 enables to control output, Low level effective, and power ratio control field effect transistor Q5 conducting, now U6 is in running order.
GPIO2 pin, GPIO3 pin, GPIO4 pin only have a low level simultaneously.
GPIO5 pin connecting valve SW1, for opening analog-digital chip U4 order button;
GPIO6 pin connecting valve SW2, for opening analog-digital chip U5 order button;
GPIO7 pin connecting valve SW3, for opening analog-digital chip U6 order button;
The other end ground connection of switch SW 1, SW2 and SW3.
The AND pin of Power Management Unit U3 is ground, and in analog, LD2-SET0 pin arranges 5.0V to AGND pin, SET1 pin arranges VCCA, and VCCA pin is 3.3V output, provides 3.3V and 5.0V two voltages simultaneously, VIN is power supply input pin, and VCCA is analog power.
The left and right sound channels output of digital to analog converter U4, U5, U6 connects differential operational amplifier LM358, for the analog differential audio signal of DAC output being converted to analog linearity output (Line Out) audio signal.These differential operational amplifiers LM358 output is connected on the linear output J2 of an analogue audio frequency.
For differential operational amplifier is set respectively after each digital to analog converter, be explained as follows at this: because digital to analog converter output is generally difference analogue audio signal, and the amplifier of application is single-ended analogue audio frequency amplifier conventionally.Differential operational amplifier can be balance (term " balance " means difference) input and output, can be also single-ended (non-equilibrium) input and output, is commonly used to realize the mutual conversion of Balanced or unbalanced circuit.Differential operational amplifier is here set and has realized easily this translation function.Obviously, after the corresponding parallel connection of analog output left and right sound channels that a kind of possible circuit structure is each digital to analog converter, be connected on a pair of differential operational amplifier, so only need a pair of differential operational amplifier can complete all digital to analog converter analog differential and output to linear single-ended conversion.But applicant is through overtesting, can there is the decay of phase mutual interference and audio signal in different DAC directly connection, and this is because the internal circuit of idle DAC can be attached on the analog output of DAC of work, thereby affects greatly.Therefore in preferred embodiment, after every way weighted-voltage D/A converter, independently differential operational amplifier is all set, simulated audio signal is connected in parallel to J2 after differential operational amplifier conversion process again.The parallel connection of same model operational amplifier output terminal is disturbed and decays controlled in minimum insignificant scope signal.So effectively reduce same apparatus for processing audio because there are different DAC simultaneously, the phase mutual interference between circuit and the decay of audio signal.
Be described in detail for the circuit structure of apparatus for processing audio above, this apparatus for processing audio can be for various audio-frequence player devices, and the kind of audio-frequence player device can be: portable digital audio-frequency player (MP3 player, MD player, CD Player and other digital audio-frequency player etc.), desk-top DVD player, desk-top cd machine, mobile phone, panel computer, external audio decoder, multimedia digital player etc.
Based on the structure of above-mentioned apparatus for processing audio, below in conjunction with Fig. 3, the method for work of this apparatus for processing audio is described in detail:
Power Management Unit U3 is audio frequency master controller U1 power supply, audio frequency master controller U1 initialization;
Audio frequency master controller U1 starts the keying of scheme control enable switch group selection based on default DAC.Or play before music each, the DAC while selecting this to play music by user starts scheme.Now user is to audio frequency master controller U1 input DAC enabled instruction, the keying of audio frequency master controller U1 based on this enabled instruction control enable switch group selection;
The output electric energy of Power Management Unit U3 is to selecteed a kind of model digital to analog converter power supply;
Audio frequency master controller U1 reads digital audio and video signals stream or digital audio file, and is decoded as standard digital audio frequency stream; Current selecteed digital to analog converter is analog signal by standard digital audio frequency stream translation, and exports the linear output of analogue audio frequency to.
In order to make user switch digital to analog converter in broadcasting music process, when the method also comprises the steps: audio frequency master controller U1 outputting standard digital audio stream, user inputs new DAC enabled instruction to audio frequency master controller U1; The DAC enabled instruction control enable switch group corresponding keying of audio frequency master controller U1 based on new.
Because the level of different digital to analog converter outputs is differentiated, in same equipment, the reference volume of different digital to analog converters is not of uniform size causes.In start is used different digital to analog converters or plays, switch digital to analog converter, do not process, be difficult to avoid to cause the change of user's volume, make volume become large or diminish, affect user and experience.Therefore preferred, the method also comprises the steps: the output level difference based on different model digital to analog converter, at described audio frequency master controller U1, the level adjusted value corresponding with each model digital to analog converter output level is set; In the time enabling a certain digital to analog converter work, the adjusted value of described audio frequency master controller based on the current digital to analog converter being activated, the digital to analog converter output level of control work at present.
Compared with prior art, the beneficial effects of the utility model are: many moneys analog-digital chip is set in circuit, and by selecting controlling mechanism, make optionally a kind of DAC of model power supply wherein of electric energy of Power Management Unit output, now the DAC of other model quits work, not output audio signal; And in the time selecting unit controls MPU to switch power supply, another DAC chip operation can be heard the sound that different DAC process like this in an audio-frequence player device; And in audio frequency master controller, preset the adjusted value of the level of the DAC output of different model, and adjust the output volume of different DAC by IIC control interface, make it to keep in same system relatively consistent.Compare conventional audio-frequence player device, for example MP3, because other the electric circuit constitute structure is constant, has only increased kind and the relevant control circuit etc. of DAC chip, and therefore cost does not improve too much, and function and performance greatly improve.
Be elaborated for utility model intention of the present utility model and execution mode by embodiment above, the utility model one of ordinary skill in the art are appreciated that.The above embodiment of the utility model is only one of preferred embodiment of the present utility model; for length restriction; here can not all execution modes of particularize, any enforcement that can embody the utility model claim technical scheme, all in protection range of the present utility model.
It should be noted that; above content is in conjunction with concrete execution mode further detailed description of the utility model; can not assert that embodiment of the present utility model only limits to this; under the guidance of above-described embodiment; those skilled in the art can carry out various improvement and distortion on the basis of above-described embodiment, and these improvement or distortion drop in protection range of the present utility model.
Claims (7)
1. an apparatus for processing audio, is characterized in that, this device comprises:
Audio frequency master controller, reads digital audio and video signals stream or digital audio file, and is decoded as standard digital audio frequency stream;
Comprise multiple digital to analog converters of at least two kinds of models, for being simulated audio signal by described standard digital audio frequency stream translation; The output of those digital to analog converters is connected on the linear output of same analogue audio frequency, and its digital audio input is connected respectively described audio frequency master controller with function control end;
Power Management Unit, connects described audio frequency master controller, and connects each digital to analog converter by enable switch group respectively;
In addition, described audio frequency main controller controls connects each enable switch group, make the output electric energy of described Power Management Unit under described audio frequency main controller controls, optionally, to a kind of digital to analog converter power supply of model, the digital to analog converter of other model quits work.
2. a kind of apparatus for processing audio according to claim 1, is characterized in that: the digital to analog converter that described multiple digital to analog converters are different model.
3. a kind of apparatus for processing audio according to claim 1, it is characterized in that: in described multiple digital to analog converters, the quantity that has a kind of digital to analog converter of model at least is two, and these two same model digital to analog converters all connect described audio frequency master controller, and carry out digital-to-analogue conversion to one in left and right acoustic channels respectively.
4. according to a kind of apparatus for processing audio described in claim 1-3 any one, it is characterized in that: the output of described each digital to analog converter is equipped with differential operational amplifier, for the analog differential audio signal of digital to analog converter output is converted to analog linearity output audio signal; Described differential operational amplifier is connected to the linear output of described analogue audio frequency.
5. a kind of apparatus for processing audio according to claim 4, is characterized in that: described apparatus for processing audio also comprises for reading digital audio and video signals stream that digital audio input interface or storage medium store or the reading unit of digital audio file; This reading unit is encapsulated in audio frequency master controller.
6. an audio-frequence player device, it is characterized in that: comprise the apparatus for processing audio described in claim 1-4 any one, described audio-frequence player device also comprises volume adjustment device and electroacoustic drive output, and described volume adjustment device connects the linear output of described analogue audio frequency; Described apparatus for processing audio and volume adjustment device are located in same casing, and described electroacoustic drive output is located on this casing.
7. a kind of audio-frequence player device according to claim 6, is characterized in that: described audio-frequence player device is the one in MP3 player, CD Player, DVD player, digital audio-frequency player, mobile phone, panel computer, external audio decoder, multimedia digital player.
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| CN201420176451.6U CN203761375U (en) | 2014-04-13 | 2014-04-13 | Audio processing device and audio playing equipment |
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| CN201420176451.6U CN203761375U (en) | 2014-04-13 | 2014-04-13 | Audio processing device and audio playing equipment |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103929182A (en) * | 2014-04-13 | 2014-07-16 | 郭昊 | Audio processing device, audio playing device and audio control method |
| CN104768101A (en) * | 2014-12-29 | 2015-07-08 | 青岛歌尔声学科技有限公司 | Audio multiplexing circuit, audio multiplexing system and audio multiplexing method |
-
2014
- 2014-04-13 CN CN201420176451.6U patent/CN203761375U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103929182A (en) * | 2014-04-13 | 2014-07-16 | 郭昊 | Audio processing device, audio playing device and audio control method |
| CN104768101A (en) * | 2014-12-29 | 2015-07-08 | 青岛歌尔声学科技有限公司 | Audio multiplexing circuit, audio multiplexing system and audio multiplexing method |
| CN104768101B (en) * | 2014-12-29 | 2018-08-24 | 青岛歌尔声学科技有限公司 | Audio-frequency multiplex circuit and system |
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