CN203573643U

CN203573643U - Portable multi-channel audio data collector based on ARM and FPGA

Info

Publication number: CN203573643U
Application number: CN201320760466.2U
Authority: CN
Inventors: 任慧; 蒋玉暕; 张华兵; 陈学惠; 张晶晶
Original assignee: Communication University of China
Current assignee: Communication University of China
Priority date: 2013-11-28
Filing date: 2013-11-28
Publication date: 2014-04-30
Anticipated expiration: 2023-11-28

Abstract

The utility model discloses a portable multi-channel audio data collector based on an ARM and an FPGA. The portable multi-channel audio data collector based on the ARM and the FPGA includes a signal conditioning module, an ADC conversion module, an FPGA acquisition and processing module, an SDRAM data buffer module, an ARM control and processing module and an SD card interface module; the input end of the signal conditioning module is connected with an audio input device; the output end of the signal conditioning module is connected to the input end of the ADC conversion module; the output end of the ADC conversion module is connected with the input end of the FPGA acquisition and processing module; the FPGA data acquisition and processing module and the SDRAM data buffer module are connected; the FPGA data acquisition and processing module and the ARM control and processing module are connected; and the ARM control and processing module is connected with the SD card interface module. The purposes of low power consumption and great portability are achieved.

Description

Portable multi-channel audio data collecting device based on ARM and FPGA

Technical field

The utility model relates to field of audio processing, particularly, relates to a kind of portable multi-channel audio data collecting device based on ARM and FPGA.

Background technology

At present, the fast development of signal processing technology, the communication technology and multimedia technology all has benefited from the widespread use of DSP technology.Wherein digital audio processing system requirement of real-time is very high, need to make reaction extremely fast to the sound signal of input, system works is under real-time mode, and this hardware performance that system is adopted has proposed very high requirement, comprises processing speed and memory capacity etc.The task that audio collection has been processed is day by day complicated, the requirement of processing is improved constantly, audio frequency Processing Algorithm also becomes increasingly complex, it can require audio frequency process main device with and accessory is processed within a few tens of milliseconds or shorter time, the voice data of storage magnanimity.Need audio process arithmetic speed up to 10-20MIPS, according to the requirement of different task, some processing speeds even reach 50MIPS.

Real-time Audio Collection disposal system realizes conventionally in two ways:

The first is as main frame by single computer, coordinate one or some digital signal panels to form whole system, the latter consists of the conversion chip of general or special purpose digital signal processing chip and corresponding storage chip, interface chip and sound signal.This system reliability under outdoor playback environ-ment is not high, and mutual connection easily goes wrong, and computer run is unstable in addition, extremely easily crashes.

The second by DSP and other companion chip form one can off-line working system.But for portable audio disposal system, the design proposal based on common dsp chip is not very good.First the chip cost taken by themselves of DSP and cost of development present stage remain higher, especially chip cost taken by themselves.Secondly portable set is very harsh to volume and power consumption requirement, has limited the use of dsp chip.The power consumption of DSP own is relatively large, and powered battery, by being difficult to meet the requirement in certain cruising time of equipment, is unfavorable for going out to carry.The system that DSP forms is in addition unfavorable for the expansion of later stage system, such as extended audio acquisition channel quantity, and adds some audio frequency Processing Algorithm etc.

Utility model content

The purpose of this utility model is, for the problems referred to above, proposes a kind of portable multi-channel audio data collecting device based on ARM and FPGA, to realize the little and portable advantage of power consumption.

For achieving the above object, the technical solution adopted in the utility model is:

A kind of portable multi-channel audio data collecting device based on ARM and FPGA, comprise signal condition module, ADC modular converter, FPGA acquisition processing module, SDRAM data buffering module, ARM controls processing module and SD card interface module, the input end of described signal condition module connects voice input device, the output terminal of described signal condition module connects the input end of ADC modular converter, the output terminal of described ADC modular converter connects the input end of FPGA acquisition processing module, described FPGA acquisition processing module is connected with SDRAM data buffering module, and this FPGA acquisition processing module is controlled processing module with ARM and is connected, described ARM controls in processing module and connects SD card interface module.

Further, described ADC modular converter adopts CS5341 chip, and described FPGA acquisition processing module adopts EP4CE22 chip, and described ARM controls processing module and adopts STM32F103 chip.

Further, resistance in series R16, resistance R 18 and resistance R 19 respectively between three clock signal pin mclk, sclk of described EP4CE22 chip and CS5341 chip and lrclk, shunt capacitance C14 and capacitor C 15 between the FLLT+ pin of CS5341 chip and REF_GND pin.

Further, described capacitor C 15 sizes are 0.01 μ F.

The technical solution of the utility model has following beneficial effect:

Each technical scheme of the utility model, has been used arm processor and the fpga chip of high integration, and the area of circuit board reduces greatly, thereby whole system is placed in a less cabinet, is beneficial to the portability of system.And arm processor and fpga chip have reduced power consumption simultaneously.Thereby reach the little and portable object of power consumption.

Accompanying drawing explanation

The theory diagram of the portable multi-channel audio data collecting device based on ARM and FPGA described in Fig. 1 the utility model embodiment;

Fig. 2 is FPGA acquisition processing module and the ADC modular converter electrical connection schematic diagram of the portable multi-channel audio data collecting device based on ARM and FPGA described in the utility model embodiment.

Embodiment

Below in conjunction with accompanying drawing, preferred embodiment of the present utility model is described, should be appreciated that preferred embodiment described herein is only for description and interpretation the utility model, and be not used in restriction the utility model.

As shown in Figure 1, a kind of portable multi-channel audio data collecting device based on ARM and FPGA, comprise signal condition module, ADC modular converter, FPGA acquisition processing module, SDRAM data buffering module, ARM controls processing module and SD card interface module, the input end of signal condition module connects voice input device, the output terminal of signal condition module connects the input end of ADC modular converter, the output terminal of ADC modular converter connects the input end of FPGA acquisition processing module, FPGA acquisition processing module is connected with SDRAM data buffering module, and this FPGA acquisition processing module is controlled processing module with ARM and is connected, ARM controls in processing module and connects SD card interface module.

Wherein, ADC modular converter adopts CS5341 chip, and FPGA acquisition processing module adopts EP4CE22 chip, and ARM controls processing module and adopts STM32F103 chip.As shown in Figure 2, resistance in series R16, resistance R 18 and resistance R 19 respectively between three clock signal pin mclk, sclk of EP4CE22 chip and CS5341 chip and lrclk, shunt capacitance C14 and capacitor C 15 between the FLLT+ pin of CS5341 chip and REF_GND pin.Capacitor C 15 sizes are 0.01 μ F.

Signal condition module is carried out amplitude adjustment, impedance transformation and direct current biasing setting to the sound signal of input, makes sound signal meet the simulating signal incoming level standard of ADC modular converter.

FPGA acquisition processing module is controlled ADC modular converter and is carried out audio collection, and by the data buffer storage collecting in SDRAM data buffering module, the internal logic circuit of FPGA acquisition processing module produces and writes and read address; And the interface sequence standard in strict accordance with SDRAM generates its control signal.

When the voice data in SDRAM data buffering module stores the Frame length of setting into, by FPGA acquisition processing module counting, produce a look-at-me, trigger ARM control processing module and read voice data.

ARM controls processing module and adopts the mode of DMA to send data read request to FPGA acquisition processing module, once reads the Frame of certain length, and it is write in SDRAM data buffering module.Audio file is stored and is adopted FAT file system in SDRAM data buffering module, and the voice data of each passage leaves in wherein with wav file form, and data layout is 16Bit, and sampling rate is 48KHz.

ADC modular converter is selected the CS5341 of Cirrus Logic company, is the audio ADC of a two-channel 2-4 4Bit precision, and the maximum picking rate of every passage is 192KHz, can realize higher sampling precision and speed.

Fpga chip in FPGA acquisition processing module has by the connected signal wire of CS5341: mclk, sclk, lrclk, rst_o.Wherein FPGA provides sampling synchronization clock signal by mclk, sclk and these three signal wires of lrclk for CS5341.ADC control module in FPGA is drawn high RST_n pin pin level by rst_o signal wire, and indication starts the collection of respective channel; CS5341 by the resulting voice data of Collect conversion by the FPGA that outputs to of sdout_1 serial.FPGA reads and data is converted in the FIFO that parallel form is saved in FPGA inside.

Because amount of audio data is large, requirement of real-time is higher, needs high-capacity and high-speed storer to make voice data buffering.SDRAM in SDRAM data buffering module compares the memory devices such as SRAM and has the advantages such as speed is fast, capacity is large, therefore becomes first-selected data-carrier store in audio frequency processing.

SDRAM adopts HY57V641620HG chip, adopts 3.3V power supply, and input and output pin and LVTTL are compatible.Memory capacity is 64Mbit, and inside is divided into the page of 4 8M, and each page is divided into 4096 row, and every row 256 row, often show 16 bit data.Address wire A11-A0 sends into row address under RAS is synchronous, and address wire A7-A0 sends into column address under CAS is synchronous, by BA0 and BA1, selects paging.

ARM chip in ARM control processing module is selected the TM32F103 chip of ST Microelectronics, and frequency of operation reaches 80Mhz, can guarantee real time high-speed and control FPGA subsystem and SD card storage data.

Wherein three of CS5341 chip clock signal pin mclk are that Master Clock major clock, sclk are that Serial Clock serial clock and lrclk are Left Right Clock left and right channel clock, the FLLT+ of CS5341 chip be Positive Voltage Reference reference voltage pin and REF_GND be Ground reference with reference to pin.

Software in the technical program in each control module is existing known software.

Finally it should be noted that: the foregoing is only preferred embodiment of the present utility model, be not limited to the utility model, although the utility model is had been described in detail with reference to previous embodiment, for a person skilled in the art, its technical scheme that still can record aforementioned each embodiment is modified, or part technical characterictic is wherein equal to replacement.All within spirit of the present utility model and principle, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection domain of the present utility model.

Claims

1. the portable multi-channel audio data collecting device based on ARM and FPGA, it is characterized in that, comprise signal condition module, ADC modular converter, FPGA acquisition processing module, SDRAM data buffering module, ARM controls processing module and SD card interface module, the input end of described signal condition module connects voice input device, the output terminal of described signal condition module connects the input end of ADC modular converter, the output terminal of described ADC modular converter connects the input end of FPGA acquisition processing module, described FPGA acquisition processing module is connected with SDRAM data buffering module, and this FPGA acquisition processing module is controlled processing module with ARM and is connected, described ARM controls in processing module and connects SD card interface module.

2. the portable multi-channel audio data collecting device based on ARM and FPGA according to claim 1, it is characterized in that, described ADC modular converter adopts CS5341 chip, and described FPGA acquisition processing module adopts EP4CE22 chip, and described ARM controls processing module and adopts STM32F103 chip.

3. the portable multi-channel audio data collecting device based on ARM and FPGA according to claim 2, it is characterized in that, resistance in series R16, resistance R 18 and resistance R 19 respectively between three clock signal pin mclk, sclk of described EP4CE22 chip and CS5341 chip and lrclk, shunt capacitance C14 and capacitor C 15 between the FLLT+ pin of CS5341 chip and REF_GND pin.

4. the portable multi-channel audio data collecting device based on ARM and FPGA according to claim 3, is characterized in that, described capacitor C 15 sizes are 0.01 μ F.