CN2819313Y - Qualified audio-frequency signal converting playback device with solid memory as medium - Google Patents

Abstract

With the solid-state memory is the high-quality audio-frequency signal conversion playback reproducer of medium, transforms decode control module wherein is electrically connected with solid-state memory, interface circuit controller, simulated audio signal input media, power module, filtering power amplifier sounding module by its peripheral circuit, interface circuit is electrically connected with the interface circuit controller, and power module provides electric energy to each components and parts.The high-quality digital audio signal of simulated audio signal conversion or the CD-DA formatted file of importing from interface are stored in the solid-state memory, when needing, be stored in high-quality digital audio signal in the solid-state memory or CD-DA formatted file and be converted to simulated audio signal and play by filtering power amplifier sounding module.

Description

A kind of is the high-quality audio-frequency signal conversion playback reproducer of medium with the solid-state memory

Technical field

The utility model relates to audio signal processor, particularly can be converted to high-quality digital audio file to simulated audio signal, CD-DA formatted file for example, but and a kind of of this high-quality digital audio file of playback be the high-quality audio-frequency signal conversion playback reproducer of medium with the solid-state memory.

Background technology

In general, the medium of sound signal has experienced the three generations.The medium of the first generation is tape and disc, has problems such as complex structure, easy cassette tape and wearing and tearing; The medium of the second generation is a CD, has that shaven head is easily aging, the life-span is short and problem such as antivibration ability; As medium, the volume of hard disk is big with hard disk for the third generation, and power consumption is big, has noise easily to generate heat, not vibration resistance and impact.It should be noted that the capacity of solid-state memory is done bigger and bigger along with the improving constantly of semiconductor technology level, capacity has reached 16GB at present, is expected to accomplish 32GB from now on, 64GB......, and its price will be more and more lower.Particularly it has that volume is little, low in energy consumption, antivibration is good and distinguishing feature such as the life-span is long, therefore, will obtain tremendous development with solid-state memory as the medium of audio-frequency information.Popular MP3 player is exactly a kind of device that adopts solid-state memory as medium at present.A typical mp3 file obtains with MPEG1 LAYER3 form compressed encoding voice data.After the MP3 song downloads to the hard disk of computer from network, the one, utilize multimedia computer to play; The 2nd, burning becomes CD to play with CD-audio player; The 3rd, be sent to the MP3 player by computer and listen to oneself.From the source of mp3 file with utilize method some deficiency of MP3 player as can be seen, subject matter wherein be owing to mp3 file adopt tonequality that packed data storage and decompression broadcast mode make MP3 than the lower tone of CD some.The MP3 player generally is by solid-state memory, interface circuit, and the interface circuit controller, power module, the power amplifier acoustical generator, microprocessor, components and parts such as decoding chip connect to form.Though it supports to play MP3 format digital audio signal, but but simulated audio signal can not be converted to high tone quality digital audio signal and playback, do not support high tone quality digital audio signal directly input and broadcast yet, for example do not support the CD-DA formatted file directly to import and play.According to the above-mentioned fact, constitute pattern if can use for reference the software design and the hardware of MP3 player, by suitable method the CD-DA formatted file is stored in the solid-state memory, study, design and provide a kind of high-quality digital audio playing device, and this playing device is applied to automobile audio, home theater and individual walkman, should this be desirable just.

The utility model content

It is the sound signal conversion playback reproducer of medium with the solid-state memory that technical problem to be solved in the utility model provides a kind of, this device can be converted to simulated audio signal high-quality digital audio signal and store then, high-quality digital audio signal that can the above-mentioned storage of playback when needing, can also playback by the high-quality digital audio signal of external interface input.So-called high-quality digital audio signal generally is meant with the CD-DA formatted file to be the digital audio-frequency data of representative, that is to say that this conversion playback reproducer not only can play CD-DA formatted file, and can play MP3, WMA formatted file.

For solving the problems of the technologies described above, it is the sound signal conversion playback reproducer (hereinafter to be referred as the conversion playback reproducer) of medium with the solid-state memory that the utility model provides a kind of, consist predominantly of solid-state memory, interface circuit, interface circuit controller, simulated audio signal input media, power module, filtering power amplifier sounding module, it is characterized in that:

Also include a transforms decode control module, described transforms decode control module is electrically connected with solid-state memory, interface circuit controller, simulated audio signal input media, power module, filtering power amplifier sounding module by its peripheral circuit, interface circuit is electrically connected with the interface circuit controller, and power module provides electric energy to each components and parts;

Signal circulation wherein is:

The simulated audio signal input media is input to the transforms decode control module with simulated audio signal,

The transforms decode control module is changed with coding simulated audio signal and is made it become to be transported in the solid-state memory behind the digital audio-frequency data and store, perhaps interface circuit and interface circuit controller are input to the CD-DA formatted file in the transforms decode control module and directly store in the solid-state memory

Be stored in digital audio-frequency data in the solid-state memory and output to be converted in the transforms decode control module and the quality simulated audio signal such as be reduced to and be transported in the filtering power amplifier sounding module,

Filtering power amplifier sounding module carries out playing after filtering and the signal amplification to the simulated audio signal of reduction.

As preferably, described transforms decode control module is electrically connected by analog/digital converter, digital/analog converter, audio codec, central processing unit to be formed, audio codec wherein and central processing unit are integrated on same integrated circuit (IC) chip-master chip, and the model of described master chip is KBDC101 or KBD1200.Analog/digital converter is electrically connected with solid-state memory, simulated audio signal input media and master chip respectively; Digital/analog converter is electrically connected with master chip and filtering power amplifier sounding module respectively; Master chip is electrically connected with solid-state memory, interface circuit controller and power module and analog/digital converter and digital/analog converter respectively.

As preferably, the conversion replayed section of described simulated audio signal is that the simulated audio signal input media is input to analog/digital converter with simulated audio signal, analog/digital converter to simulated audio signal take a sample, quantification, encoding process, under the control of central processing unit, solid-state memory is carried out the write operation order digital audio-frequency data is stored; Perhaps under the control of central processing unit, solid-state memory execution read operation order outputs to digital/analog converter with the digital audio-frequency data of its internal reservoir, digital/analog converter is converted to simulated audio signal with digital audio-frequency data and is input in the filtering power amplifier sounding module, and filtering power amplifier sounding module carries out playing after filtering and the signal amplification to the simulated audio signal of reduction.

As preferably, the input replayed section of described CD-DA formatted file is that interface circuit controller control interface circuit is input to the CD-DA formatted file in the transforms decode control module, under the control of central processing unit, solid-state memory is carried out the write operation order and directly the CD-DA formatted file is stored; Perhaps under the control of central processing unit, solid-state memory execution read operation order outputs to digital/analog converter with the CD-DA formatted file of its internal reservoir, digital/analog converter is converted to simulated audio signal with the CD-DA formatted file and is input in the filtering power amplifier sounding module, and filtering power amplifier sounding module carries out playing after filtering and the signal amplification to the simulated audio signal of reduction.

As preferably, analog/digital converter in the described transforms decode control module and digital/analog converter are by having 24 bit data transmission bus, and the integrated circuit (IC) chip of sampling frequency more than 192KHz formed.

As preferably, audio codec in the described transforms decode control module is made up of the integrated circuit (IC) chip of plug-in, described audio codec is realized the analog/digital of audio frequency and the conversion of digital-to-analog, the encoding and decoding of compatible MP3, WMA formatted file according to the CD-DA format standard.

As preferably, the central processing unit in the described transforms decode control module is made up of the integrated circuit (IC) chip of plug-in, and all signals and the operation of described conversion playback reproducer are controlled and handled to described central processing unit as program storage.

As preferably, the solid-state memory in the described conversion playback reproducer is the FLASH storer, as data-carrier store, is used to deposit CD file, mp3 file, and its capacity is 64MB～4GB, and its model is K9F1208UOM.

As preferably, interface circuit in the described conversion playback reproducer, the interface circuit controller is to contain the integrated circuit that the integrated circuit (IC) chip of USBHOST or USB ON-THE-GO agreement is formed, it and the direct communications of peripherals such as USB flash disk, MP3 player and portable hard drive, and its model is KBU106.

As preferably, the simulated audio signal input media in the described conversion playback reproducer can be microphone or other analogue audio frequency collectors.

As preferably, the filtering power amplifier sounding module in the described conversion playback reproducer is made up of low-pass filter and power amplifier phonation circuit, and wherein low-pass filter contains a second order active low-pass filter circuit at least.

As preferably, described conversion playback reproducer includes key circuit, and key circuit is electrically connected with the transforms decode control module, and key circuit is carried out by central processing unit control in the user control command signal input transforms decode control module.

As preferably, include display module in the described conversion playback reproducer, display module comprises display screen driving and control circuit and display screen, described display screen can be fluorescent display screen or digital screen or LCDs.

As preferably, include radio receiver module in the described conversion playback reproducer, described radio receiver module is electrically connected with the transforms decode control module, under the control of central processing unit, the sound signal of radio receiver module output is sent in digital control stereo audio processor or the filtering power amplifier sounding module.

As preferably, include digital control stereo audio processor in the described conversion playback reproducer, described digital control stereo audio processor is made up of by audio process integrated circuit U4 and the peripheral circuit of TDA7313X model, it to CD and MP3 simulating signal, make gating from the voice signal of microphone and radio receiver signal and judge that it is handled volume, tone height, symmetery and decay.

The utility model compared with prior art has outstanding feature:

Record in the technical scheme that " the transforms decode control module is changed with coding simulated audio signal and made it become to be transported in the solid-state memory behind the digital audio-frequency data and store; perhaps interface circuit and interface circuit controller are input to the CD-DA formatted file in the transforms decode control module and directly store in the solid-state memory

Be stored in digital audio-frequency data in the solid-state memory and output to be converted in the transforms decode control module and the quality simulated audio signal such as be reduced to and be transported in the filtering power amplifier sounding module,

Filtering power amplifier sounding module carries out playing after filtering and the signal amplification to the simulated audio signal of reduction "

This section words are told us: the digital audio-frequency data that is transported in the solid-state memory is identical with the digital audio-frequency data of exporting from solid-state memory, and promptly so-called true form is gone into, and true form goes out.Need not to compress the encoding and decoding with decompress(ion) in going into out process, true form is meant that the number that does not have compression does not promptly have the coded data of compression.

Can also see, no matter be simulated audio signal or CD-DA formatted file, in their conversion replayed section, there is not " digital compression " and " digital decompression " link, do not have " digital compression circuit " and " digital decompression circuit " below in the circuit diagram that will describe yet.That is to say that the utility model has adopted " data do not have compress technique ", adopted the audio codec that comprises analog/digital converter and digital/analog converter, realize that the modulus of audio frequency and the conversion of digital-to-analogue meet the CD format standard, and analog/digital converter and digital/analog converter all are to have 24 bit data transmission bus, the integrated circuit (IC) chip of its sampling frequency more than 192KHz.Data do not have compression, and for example the capacity of input file is 1M, and the capacity of output file still is 1M.The result who does like this is that distortion is considerably less, is equivalent to former sound and plays.Therefore we can say that the utility model is a kind of high tone quality digital audio playing device, not only can the play CD formatted file, and the broadcast of formatted files such as compatible MP3, WMA.In a word, information stores by document form, and the storage mode of CD-DA formatted file is to adopt uncompressed data storage (the MP3 format file adopts the packed data storage), sees it is the pure digi-tal storage from the medium characteristics, does not have compression and the such intermediate link of decompress(ion); Better when its tonequality level can reach play CD than cd cd, better when playing MP3 than CD MP3; Therefore the utility model is a kind of with high-quality digital audio (CD-DA formatted file) playing device of solid-state memory as Storage Media.

Description of drawings

Below in conjunction with the drawings and specific embodiments the utility model is described in further detail.

Fig. 1 is the principle of work block scheme of the utility model conversion playback reproducer.

Fig. 2 is the principle of work block scheme that simulated audio signal is converted to digital audio-frequency data according to the utility model.

Fig. 3 is the principle of work block scheme that digital audio-frequency data is reduced to simulated audio signal according to the utility model.

Fig. 4 is the principle of work block scheme of the vehicular conversion playback reproducer of one of the utility model embodiment.

Fig. 5 is the principle of work block scheme of two the family expenses formula conversion playback reproducer of the utility model embodiment.

Fig. 6 is the principle of work block scheme of three the pocket conversion playback reproducer of the utility model embodiment.

Fig. 7 is the circuit diagram of the transforms decode control module of vehicular conversion playback reproducer shown in Figure 4.

Fig. 8 is the circuit diagram of the solid-state memory of vehicular conversion playback reproducer shown in Figure 4.

Fig. 9 is the interface circuit of vehicular conversion playback reproducer shown in Figure 4 and the circuit diagram of controller thereof.

Figure 10 is the circuit diagram of the low-pass filter of vehicular conversion playback reproducer shown in Figure 4.

Figure 11 is the circuit diagram of the digital control stereo audio processor of vehicular conversion playback reproducer shown in Figure 4.

Figure 12 is the circuit diagram of the transforms decode control module of family expenses formula conversion playback reproducer shown in Figure 5.

Figure 13 is the circuit diagram of the transforms decode control module of pocket conversion playback reproducer shown in Figure 6.

Figure 14 is radio receiver module, the earphone power amplifier module of pocket shown in Figure 6 conversion playback reproducer, the combinational circuit diagram of simulated audio signal input media.

Embodiment

It is the basic structure of the sound signal conversion playback reproducer of medium with the solid-state memory that Fig. 1 has provided the utility model a kind of, consist predominantly of solid-state memory, interface circuit, interface circuit controller, simulated audio signal input media, power module, filtering power amplifier sounding module, it is characterized in that:

Also include a transforms decode control module 7, described transforms decode control module 7 is electrically connected with solid-state memory 1, interface circuit controller 3, simulated audio signal input media 4, power module 5, filtering power amplifier sounding module 6 by its peripheral circuit, interface circuit 2 is electrically connected with interface circuit controller 3, and power module 5 provides electric energy to each components and parts;

Signal circulation wherein is:

Simulated audio signal input media 4 is input to transforms decode control module 7 with simulated audio signal,

7 pairs of simulated audio signals of transforms decode control module are changed and with coding it are become to be transported to storage in the solid-state memory 1 behind the digital audio-frequency data, perhaps interface circuit 2 is input to the CD-DA formatted file in the transforms decode control module 7 with interface circuit controller 3 and directly stores in the solid-state memory 1

Be stored in digital audio-frequency data in the solid-state memory 1 and output to be converted in the transforms decode control module 7 and the quality simulated audio signal such as be reduced to and be transported in the filtering power amplifier sounding module 6,

The simulated audio signal of 6 pairs of reduction of filtering power amplifier sounding module carries out filtering and signal amplifies broadcast afterwards.

Conversion playback reproducer as shown in Figure 1, described transforms decode control module 7 is electrically connected and is formed by analog/digital converter 71, digital/analog converter 72, audio codec 73, central processing unit 74, audio codec 73 wherein and central processing unit 74 are integrated on same integrated circuit (IC) chip-master chip, and the model of described master chip is KBDC101 or KBD1200.

In Fig. 1, analog/digital converter 71 is electrically connected with solid-state memory 1, simulated audio signal input media 4 and master chip respectively; Digital/analog converter 72 is electrically connected with master chip and filtering power amplifier sounding module 6 respectively, and master chip is electrically connected with solid-state memory 1, interface circuit controller 3 and power module 5 and analog/digital converter 71 and digital/analog converter 72 respectively.

As shown in Figure 2, simulated audio signal input media 4 is input to analog/digital converter 71 with the simulated audio signal that collects, 71 pairs of simulated audio signals of analog/digital converter are taken a sample, quantification, encoding process, simulated audio signal is converted into digital audio-frequency data (coded data), under the control of central processing unit 74, solid-state memory 1 is carried out the write operation order described digital audio-frequency data is stored.

As shown in Figure 3, under the control of central processing unit 74, solid-state memory 1 is carried out the read operation order, the digital audio-frequency data (coded data) of its internal reservoir is exported to digital/analog converter 72, handle through digital/analog converter 72, the simulated audio signal of qualities such as digital audio-frequency data is reduced to, and the power amplifier 62 that the simulated audio signal of quality such as described is transported to low-pass filter 61 and is communicated with it further reduces the ripples of making an uproar, and carries out signal then and amplifies and promote the loudspeaker pronunciation.

Fig. 2 and Fig. 3 have expressed the conversion playback overall process of simulated audio signal together.

Can see that from Fig. 2 and two expressed processes of Fig. 3 the digital audio-frequency data that is transported in the solid-state memory is identical with the digital audio-frequency data of exporting from solid-state memory, promptly so-called true form is gone into, and true form goes out.Need not to compress the encoding and decoding with decompress(ion) in going into out process, true form is meant that the number that does not have compression does not promptly have the coded data of compression.

Can also see from Fig. 2 and two expressed processes of Fig. 3, in this process, not have " digital compression " and " digital decompression " link, also not have " digital compression circuit " and " digital decompression circuit " in the back in the circuit diagram that will describe.That is to say that the utility model has adopted " data do not have compress technique ", adopted the audio codec that comprises analog/digital converter and digital/analog converter, realize that the modulus of audio frequency and the conversion of digital-to-analogue meet the CD format standard, and analog/digital converter and digital/analog converter all are to have 24 bit data transmission bus, the integrated circuit (IC) chip of its sampling frequency more than 192KHz.Data do not have compression, and for example the capacity of input file is 1M, and the capacity of output file still is 1M.The result who does like this is that distortion is considerably less, is equivalent to former sound and plays.Therefore we can say that the utility model is a kind of high-quality digital audio playing device, not only can the play CD formatted file, and the broadcast of formatted files such as compatible MP3, WMA.

Fig. 1 and Fig. 3 have expressed the input replayed section of described CD-DA formatted file together: for other digital audio formatted files (for example formatted file such as MP3, WMA) that with the CD-DA formatted file are representative, can be by the described CD-DA formatted file of interface circuit 2 inputs, interface circuit controller 3 control interface circuit 2, the CD-DA formatted file is sent in the transforms decode control module 7, the CD-DA formatted file does not need to carry out analog to digital conversion through analog/digital converter 71, but directly is stored in the solid-state memory 1 under central processing unit 74 controls.Specifically, under the control of central processing unit 74, solid-state memory 1 is carried out the write operation order and directly the CD-DA formatted file is stored, when needing to play, under the control of central processing unit 74, solid-state memory 1 execution read operation order outputs to digital/analog converter 72 with the CD-DA formatted file of its internal reservoir, digital/analog converter 72 is converted to simulated audio signal with the CD-DA formatted file and is input in the filtering power amplifier sounding module 6, and the simulated audio signal of 6 pairs of reduction of filtering power amplifier sounding module carries out filtering and signal amplifies broadcast afterwards.

More than having described the utility model a kind of is the technical scheme and the CONSTRUCTED SPECIFICATION thereof of the sound signal conversion playback reproducer of medium with the solid-state memory, and the application and the CONSTRUCTED SPECIFICATION thereof of this technical scheme is described below.

Fig. 4 is the principle of work block scheme of the vehicular conversion playback reproducer of one of the utility model embodiment.Fig. 4 includes the full content that feature and principle of work essence are formed and be electrically connected to the expressed components and parts of Fig. 1, Fig. 4 has increased some components and parts according to the work characteristics of automobile and service object's needs thereof on the basis of Fig. 1, these components and parts are key circuits 8, display module 9, radio receiver module 10, digital control stereo audio processor 11, microphone amplifying circuit 12, MIC socket 13.

Include the principle of work that simulated audio signal is converted to digital audio-frequency data of Fig. 2 expression and the principle of work that digital audio-frequency data is reduced to simulated audio signal that Fig. 3 expresses among Fig. 4.

What Fig. 4 was different with Fig. 1 is, in Fig. 4, key circuit 8 is electrically connected with transforms decode control module 7, and key circuit 8 is input to user control signal in the transforms decode control module 7, is carried out by central processing unit 74 controls.

What Fig. 4 was different with Fig. 1 is, in Fig. 4, display module 9 is driven by display screen and control circuit 91 and display screen 92 are electrically connected and form, and display screen 92 is fluorescent display screen (VFD).Display screen drives and control circuit 91 is electrically connected with central processing unit 74 in the transforms decode control module 7, central processing unit 74 sends the display screen drive control signal to display screen and drives and control circuit 91, and display screen driving and control circuit 91 are converted to drive signal with the display screen drive control signal and are input in the display screen 92 and show to drive display screen 92.

What Fig. 4 was different with Fig. 1 is, in Fig. 4, the signal input part of radio receiver module 10 is electrically connected with transforms decode control module 7, and radio receiver module 10 can receive the FM/AM radio broadcast program.Radio receiver module 10 can be input to the simulated audio signal of receiving in the digital control stereo audio processor 11.

What Fig. 4 was different with Fig. 1 is, in Fig. 4, MIC socket 13 is electrically connected with the signal input part of microphone amplifying circuit 12, and simulated audio signal can be input in the microphone amplifying circuit 12 by MIC socket 13, is input in the digital control stereo audio processor 11 by microphone amplifying circuit 12 again.

What Fig. 4 was different with Fig. 1 is, in Fig. 4, the output terminal of the digital/analog converter 72 in the transforms decode control module 7 is electrically connected with digital control stereo audio processor 11, under the control of central processing unit 74, solid-state memory 1 is carried out the read operation order, solid-state memory 1 outputs to digital/analog converter 72 with the digital audio-frequency data of its storage, and digital/analog converter 72 is converted to simulated audio signal with digital audio-frequency data and is input in the digital control stereo audio processor 11.

What Fig. 4 was different with Fig. 1 is, in Fig. 4, the signal input part of digital control stereo audio processor 11 is electrically connected with the signal output part of radio receiver module 10, digital/analog converter 72, microphone amplifying circuit 12 respectively, and the signal output part of digital control stereo audio processor 11 is electrically connected with the signal input part of low-pass filter 61; Therefore, the simulated audio signal of never sending here with the path in digital control stereo audio processor 11 can obtain equilibrium and attenuation processing, and it is very melodized that treated simulated audio signal is input in the filtering power amplifier sounding module 6 music of sending through reducing make an uproar ripple and signal to amplify again.

What Fig. 4 was different with Fig. 1 is, in Fig. 4, power module 5 adopts 12V direct supply that Vehicular accumulator cells provide and the DC power supply circuit of the 12V direct current being carried out transformation, voltage stabilizing; Power module 5 provides work energy to transforms decode control module 7 and other components and parts.In filtering power amplifier sounding module 6, low-pass filter 61, power amplifier 62, acoustical generator 63 orders are electrically connected, and power amplifier 62 wherein adopts common vehicle power amplifying circuit.

Be the explanation of the main circuit of the utility model vehicular conversion playback reproducer below.

The circuit diagram of the transforms decode control module 7 in the utility model vehicular conversion playback reproducer as shown in Figure 7: comprise master chip and peripheral circuit thereof, encode/decode audio signal device 73, central processing unit 74 are integrated in the integrated circuit (IC) chip-master chip, its model is KBDC101 or KBD1200, and it is by 16 DMCU, 16 sigma-Delta DAC, oscillator (OSC), system clock, peripheral clock, PLL, 16 bit timing device/counters, UART, LVD/LVR, I ²Compositions such as S transceiver, house dog, SPI, programmable interface, external memory interface, audio A C.DMCU is meant integrated MCU and DSP circuit in the one chip kernel.In order to carry out an instruction in the single cycle, it has powerful instruction setting and pipeline algorithmic rule.DMCU has powerful control ability, and under the situation of not disturbing DSP to handle, it can obtain effective MCU control function; CD or MP3 left and right sides simulating signal are to export from DAO-L and DAO-R respectively.Left side passage is exported through capacitance E30 behind the low-pass filter network of R15 and C43 again.Right passage is by R14, and these 3 elements of C42 and E29 constitute, and analyze with left passage.E31, R16 and C44 work to stablize PLL reference voltage (VX); R7 and E32 and inner LVD/LVR constitute the low-voltage reset circuit, the long-pending speed that resets of having determined of R7 * E32, and it is constant reset time; R53 and R54 are respectively the pull-up resistors of OSCM and TEST-MODE; R52, Y2, C46 and C47 and U3 internal oscillator constitute the 4MHz oscillatory circuit; Y3, C48 and C49 and U3 internal oscillator constitute 32.768KHz real-time clock oscillatory circuit; R55 and R80 draw or drop-down selection on doing; Digitally isolate with the inductance L 6 of band magnetic core with simulation ground; 3.3V digital power and analog power are isolated with the inductance L 5 of band magnetic core.

The circuit diagram of the solid-state memory in the utility model vehicular conversion playback reproducer as shown in Figure 8: solid-state memory 1 comprises various storage cards, FLASH storer and E2PROM etc., and its capacity can be selected between 64MB～4GB.Fig. 8 has provided the circuit of FLASH storer, the effect of this circuit is as data-carrier store, be used to store various files, as CD, mp3 file, this circuit is by U9, resistor chain RP3～RP5, R81, C64 and C65 form, and C64 and C65 are filter capacitors, each resistor chain and resistance are all made pull-up resistor usefulness, and the model of U9 is K9F1208UOM.

The interface circuit 2 in the utility model vehicular conversion playback reproducer as shown in Figure 9 and the circuit diagram of interface circuit controller 3.This circuit is by U8, Y4, and RP1, RP2, Q1, R58～R64, C50～C53 forms.Its effect is control USB flash disk, MP3 player and portable hard drive etc. and the communication of this machine.CN1 is general USB socket, and U8 is USB HOST or otg controller, is KBU106 with reference to model, it can with directly communication such as USB flash disk, MP3 player and portable hard drive, its transfer rate can reach 12Mbps.The pll clock driver of the inside of C52, C53 and Y4 and U8 constitutes the 6MHz oscillatory circuit.RP1 makes the pull-up resistor of DREQ, SDATA, DCLK, XRESET, and RP2 is as the pull-up resistor of XCS, SO, SI and SCLK.C51 is the filter capacitor of the VDD33 power supply of U8, and LED is used for the transmission of designation data stream: transmission is arranged, light; Do not have and transmit, do not work.Q1, R64 and C50 constitute analog switching circuit, be used to control USB interface+5V voltage, it is controlled by PDM.When PDM was high level, Q1 ended, and this machine does not offer USB socket+5V voltage; When PDM is low level, the Q1 conducting, this machine offers USB socket+5V voltage.The USB interface data transmit and adopt the difference input mode, and plug-in pull down resistor R62 and R63 are that device U8 is desired, and R58～R61 is beneficial to EMC/EMI.

The circuit diagram of the low-pass filter 61 in the filtering power amplifier sounding module 6 in the utility model vehicular conversion playback reproducer as shown in figure 10: this circuit is made of 4 identical low-pass filter LPF, its effect is that each channel signal is made low-pass filtering treatment, remove clutter, make signal become clean.With the RF passage is that example describes, and EC68 and EC67 are respectively the input and output coupling capacitances; R92～R94, C10, C66 and U14-A constitute second order active low-pass filter circuit, its voltage gain is relevant to the ratio of R94 with R92, and cutoff frequency is long-pending relevant with R94 * C10 * R93 * C66's, and this is long-pending few more, cutoff frequency is high more, and cutoff frequency is got KHz more than 20 usually.RR, LR, LF passage are analyzed identical with RF, are omitted.

In addition, R96, R97, EC74, C72 and R99, R98, EC77, C70 constitute power supply mid-point voltage circuit respectively, and resistance is used for dividing potential drop, and electric capacity is used for filtering, and R95 and R100 make current-limiting resistance, and C75, EC73, C76, EC78 make LPF modular power source filter capacitor.U13 and U14 are the double operational integrated circuit, and model is LM4558.

Digital control stereo audio processor circuit figure in the utility model vehicular conversion playback reproducer as shown in figure 11: this circuit is made up of audio process integrated circuit U4 and peripheral circuit.The model of U4 is TDA7313X, and U4 is numerically controlled stereo audio processor, and it is handled volume, tone height, balanced (left side/right side) and decay, and it provides selectable input gain outside loudness functions.Control is by I ²C bus Microprocessor Interface is finished.The universal serial bus decoding latch of master chip and U4 passes through I exactly ²The C bus is carried out communication.I ²The C bus is made up of SDA and these two lines of SCL, and must connect and draw resistance.

Fig. 5 is the principle of work block scheme of two the family expenses formula sound signal conversion playback reproducer of the utility model embodiment.It is the improvement of doing at the characteristics of family expenses on the basis of one of embodiment.Fig. 5 includes the full content that feature and principle of work essence are formed and be electrically connected to the expressed components and parts of Fig. 4, Fig. 5 has increased some components and parts according to the characteristics of home entertaining and service object's needs thereof on the basis of Fig. 4, these components and parts are infrared receiving terminals 14, AV terminal 15, All-in-One card socket 16.

What Fig. 5 was different with Fig. 4 is, in Fig. 5, the output terminal of infrared receiving terminal 14 is electrically connected with transforms decode control module 7, and infrared receiving terminal 14 is input to the infrared control signal that receives in the central processing unit 74 in the transforms decode control module 7.The signal input part of AV terminal 15 is electrically connected with the signal output part of low-pass filter 61, simulated audio signal passes through balanced and attenuation processing in digital control stereo audio processor 11 after, be input in the filtering power amplifier sounding module 6, simulated audio signal in the filtering power amplifier sounding module 6 is input to respectively in AV terminal 15 and the power amplifier 62 through behind the low-pass filter 61, and power amplifier 62 is the normal domestic use type.All-in-One card socket 16 is electrically connected with transforms decode control module 7.Power module 5 is for using the AC/DC change-over circuit of 220V alternating current.That display screen 92 uses is digital display screen (LED).

Fig. 6 is the principle of work block scheme of three the pocket conversion playback reproducer of the utility model embodiment.Fig. 6 includes the full content that feature and principle of work essence are formed and be electrically connected to the expressed components and parts of Fig. 1, embodiment three obviously different with one of two and embodiment of embodiment.Sample according to the utility model design trial-production is the same big with at present commercially available pocket MP3 player, and its distinguishing feature is to play the good especially CD formatted file of tonequality.

In Fig. 6, come substituted audio processor, LPF and AMP circuit with the earphone power amplifier, have only earphone amplification driving circuit 62 and earphone 63 in filtering power amplifier sounding module 6, they all are earphone of the prior art and earphone power amplifier, earpieces socket generally commonly used and band line earphone.That display screen 92 uses is LCDs (LCD).Because power consumption is very low, can be directly with No. 7 dry cell power supplies.Radio receiver module 10 adopts micromodule.Remove microphone socket and amplifying circuit; Increase LINE-IN mini jack and amplifying circuit.USB socket adopts miniature mini socket.Can further understand the design feature of pocket conversion playback reproducer with reference to Figure 14.

In Figure 14: miaow head M2 and model are that U4 and the peripheral cell of LMV358 constitutes the MICIN amplifying circuit, and gaining is 6dB; Socket J3 is as the input end of LINE IN; Model is that the U7 of AD1871 is as high-quality audio A C; Above-mentioned three parts constitute high-quality recording circuit with MCU (microprocessor) and solid-state memory 1; DA-101 is 88～108MHz miniature FM radio receiver module; Model is that U3 and the peripheral cell of BH3544 constitutes the earphone amplification driving circuit, and J2 is an earphone socket, and U3 has quiet control function; Input signal comprises CD signal, MP3 signal and radio reception signal.

The circuit diagram of the transforms decode control module 7 of the utility model family expenses formula conversion playback reproducer as shown in figure 12, the circuit diagram of the transforms decode control module 7 of the utility model pocket conversion playback reproducer as shown in figure 13, the circuit diagram of the transforms decode control module 7 of they and the utility model vehicular shown in Figure 7 conversion playback reproducer is basic identical, and the model of the master chip among the figure all is KBDC101 or KBD1200.Peripheral circuit among the figure is similar, and title, model and the method for attachment of components and parts that each peripheral circuit adopts specifically are illustrated among Fig. 7, Figure 12, Figure 13.

The utility model family expenses formula conversion playback reproducer has as shown in Figure 5 adopted the shown circuit of Fig. 8, Fig. 9, Figure 10 and Figure 11, therefore the solid-state memory 1 that adopts in two of one of the utility model embodiment and embodiment, interface circuit 2, interface circuit controller 3, low-pass filter 61 in the filtering power amplifier sounding module 6, radio receiver module 10, digital control stereo audio processor 11, microphone amplifying circuit 12, MIC socket 13 circuit are all identical.

The utility model pocket conversion playback reproducer has as shown in Figure 6 adopted Fig. 8 and the shown circuit of Fig. 9, so the solid-state memory 1 that adopts in three kinds of embodiments of the utility model, interface circuit 2, and interface circuit controller 3 circuit are identical.

Claims (15)

1. one kind is the sound signal conversion playback reproducer of medium with the solid-state memory, consists predominantly of solid-state memory, interface circuit, interface circuit controller, simulated audio signal input media, power module, filtering power amplifier sounding module, it is characterized in that:

Also include a transforms decode control module (7), described transforms decode control module (7) is electrically connected with solid-state memory (1), interface circuit controller (3), simulated audio signal input media (4), power module (5), filtering power amplifier sounding module (6) by its peripheral circuit, interface circuit (2) is electrically connected with interface circuit controller (3), and power module (5) provides electric energy to each components and parts;

Signal circulation wherein is:

Simulated audio signal input media (4) is input to transforms decode control module (7) with simulated audio signal,

Transforms decode control module (7) is changed simulated audio signal and with coding it is become to be transported to storage in the solid-state memory (1) behind the digital audio-frequency data, perhaps interface circuit (2) is input to the CD-DA formatted file in the transforms decode control module (7) with interface circuit controller (3) and directly stores in the solid-state memory (1)

Be stored in digital audio-frequency data in the solid-state memory (1) and output to be converted in the transforms decode control module (7) and the quality simulated audio signal such as be reduced to and be transported in the filtering power amplifier sounding module (6),

Filtering power amplifier sounding module (6) carries out playing after filtering and the signal amplification to the simulated audio signal of reduction.

2. conversion playback reproducer according to claim 1 is characterized in that:

Described transforms decode control module (7) is electrically connected by analog/digital converter (71), digital/analog converter (72), audio codec (73), central processing unit (74) to be formed, audio codec wherein (73) and central processing unit (74) are integrated on same integrated circuit (IC) chip-master chip, and the model of described master chip is KBDC101 or KBD1200.

Analog/digital converter (71) is electrically connected with solid-state memory (1), simulated audio signal input media (4) and master chip respectively; Digital/analog converter (72) is electrically connected with master chip and filtering power amplifier sounding module (6) respectively; Master chip is electrically connected with solid-state memory (1), interface circuit controller (3) and power module (5) and analog/digital converter (71) and digital/analog converter (72) respectively.

3. conversion playback reproducer according to claim 1 and 2, it is characterized in that: the conversion replayed section of described simulated audio signal is that simulated audio signal input media (4) is input to analog/digital converter (71) with simulated audio signal, analog/digital converter (71) to simulated audio signal take a sample, quantification, encoding process, under the control of central processing unit (74), solid-state memory (1) is carried out the write operation order digital audio-frequency data is stored; Perhaps under the control of central processing unit (74), solid-state memory (1) execution read operation order outputs to digital/analog converter (72) with the digital audio-frequency data of its internal reservoir, digital/analog converter (72) is converted to simulated audio signal with digital audio-frequency data and is input in the filtering power amplifier sounding module (6), and filtering power amplifier sounding module (6) carries out playing after filtering and the signal amplification to the simulated audio signal of reduction.

4. conversion playback reproducer according to claim 1 and 2, it is characterized in that: the input replayed section of described CD-DA formatted file is that interface circuit controller (3) control interface circuit (2) is input to the CD-DA formatted file in the transforms decode control module (7), under the control of central processing unit (74), solid-state memory (1) is carried out the write operation order and directly the CD-DA formatted file is stored; Perhaps under the control of central processing unit (74), solid-state memory (1) execution read operation order outputs to digital/analog converter (72) with the CD-DA formatted file of its internal reservoir, digital/analog converter (72) is converted to simulated audio signal with the CD-DA formatted file and is input in the filtering power amplifier sounding module (6), and filtering power amplifier sounding module (6) carries out playing after filtering and the signal amplification to the simulated audio signal of reduction.

5. conversion playback reproducer according to claim 1 and 2, it is characterized in that: analog/digital converter (71) in the described transforms decode control module (7) and digital/analog converter (72) are by having 24 bit data transmission bus, and the integrated circuit (IC) chip of sampling frequency more than 192KHz formed.

6. conversion playback reproducer according to claim 1 and 2, it is characterized in that: the audio codec (73) in the described transforms decode control module (7) is made up of the integrated circuit (IC) chip of plug-in, described audio codec (73) is realized the analog/digital of audio frequency and the conversion of digital-to-analog, the encoding and decoding of compatible MP3, WMA formatted file according to the CD-DA format standard.

7. conversion playback reproducer according to claim 1 and 2, it is characterized in that: the central processing unit (74) in the described transforms decode control module (7) is made up of the integrated circuit (IC) chip of plug-in, all signals and the operation of described conversion playback reproducer are controlled and handled to described central processing unit (74) as program storage.

8. conversion playback reproducer according to claim 1 and 2, it is characterized in that: the solid-state memory (1) in the described conversion playback reproducer is the FLASH storer, as data-carrier store, is used to deposit CD file, mp3 file, its capacity is 64MB～4GB, and its model is K9F1208UOM.

9. conversion playback reproducer according to claim 1 and 2, it is characterized in that: the interface circuit (2) in the described conversion playback reproducer, the integrated circuit that interface circuit controller (3) is formed for the integrated circuit (IC) chip that contains USB HOST or USB ON-THE-GO agreement, it and the direct communications of peripherals such as USB flash disk, MP3 player and portable hard drive, its model is KBU106.

10. conversion playback reproducer according to claim 1 and 2 is characterized in that: the simulated audio signal input media (4) in the described conversion playback reproducer can be microphone or other analogue audio frequency collectors.

11. conversion playback reproducer according to claim 1 and 2, it is characterized in that: the filtering power amplifier sounding module (6) in the described conversion playback reproducer can comprise low-pass filter (61), and described low-pass filter (61) includes at least one second order active low-pass filter circuit.

12. conversion playback reproducer according to claim 1 and 2, it is characterized in that: described conversion playback reproducer includes key circuit (8), key circuit (8) is electrically connected with transforms decode control module (7), key circuit (8) is carried out by central processing unit (74) control in the user control command signal input transforms decode control module (7).

13. conversion playback reproducer according to claim 1 and 2, it is characterized in that: include display module (9) in the described conversion playback reproducer, display module (9) comprises that display screen drives and control circuit (91) and display screen (92), and described display screen (92) can be fluorescent display screen or digital screen or LCDs.

14. conversion playback reproducer according to claim 1 and 2, it is characterized in that: include radio receiver module (10) in the described conversion playback reproducer, described radio receiver module (10) is electrically connected with transforms decode control module (7), under the control of central processing unit (74), the sound signal of radio receiver module (10) output is sent in digital control stereo audio processor (11) or the filtering power amplifier sounding module (6).

15. conversion playback reproducer according to claim 1 and 2, it is characterized in that: include digital control stereo audio processor (11) in the described conversion playback reproducer, described digital control stereo audio processor (11) is made up of by audio process integrated circuit U4 and the peripheral circuit of TDA7313X model, it to CD and MP3 simulating signal, make gating from the voice signal of microphone and radio receiver signal and judge that it is handled volume, tone height, symmetery and decay.

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