CN201532773U

CN201532773U - Player used for vehicle-mounted acoustics or mini acoustics

Info

Publication number: CN201532773U
Application number: CN200920232390XU
Authority: CN
Inventors: 丁国华; 冯军; 方伟; 吴科; 余雪梅
Original assignee: WUXI SI-POWER MICRO-ELECTRONICS Co Ltd
Current assignee: WUXI SI-POWER MICRO-ELECTRONICS Co Ltd
Priority date: 2009-09-30
Filing date: 2009-09-30
Publication date: 2010-07-21
Anticipated expiration: 2019-09-30

Abstract

The utility model relates to a player used for vehicle-mounted acoustics or mini acoustics, including a DSP nucleus with a hardware accelerator, the DSP nucleus being connected with a ROM and a stochastic memory; the DSP nucleus is connected with an AHB bus, a DMA controller is connected with the AHB bus through a main port of a bus of the DMA controller, the AHB bus is connected with a D/A conversion module and an A/D conversion module through an APB peripheral bus, and the output of the D/A conversion module is connected with a power amplifier; the AHB bus is also connected with a general-purpose data interface. The player is capable of performing D/A conversion by ADC, and ensuring music after decoding to be reproduced by means of ultrahigh signal-noise ratio; an audio decoding part provides the DSP and the hardware accelerator to decode real time by low power consumption, such that the acoustic quality of the music played by vehicle-mounted acoustics or mini acoustics is equally perfect compared with that of CD, cost and power consumption are all reduced, and service life is prolonged.

Description

A kind of player that is used for vehicle-mounted or mini audio

Technical field

The utility model relates to a kind of player, especially a kind of vehicle-mounted and mini audio digital audio-frequency player.

Background technology

Vehicle audio uses CD laser disc, for example portable recorder, language learner etc. from using tape the earliest to develop thereupon.The tape acoustic mass is not high, operates not intuitively, and video disc should not be operated and preserve.There is a common defective in these two kinds of vehicle audios, must constantly buy virgin tape or new laser disc according to the personal preference exactly, give up old (damage) tape or laser disc, so promptly increase use cost, again environment are produced certain influence.

Along with the development of network and MP3, USB flash disk, SD card technique, vehicle-mounted and mini audio has produced a kind of new needs, adopts small and exquisite USB flash disk or the SD card portable sound system as the source of sound storer exactly.

And the Digital Audio Compression Coding form is divided into lossy compression method form and nondestructive compression type, popular MP3, WMA etc. are the lossy compression method forms at present, as its name suggests, be to have given up the part music detail, so can not reappear all details of music source during decodes and plays fully; And be nondestructive compression type as forms such as APE, Flac, its content and wav file are equal to, and have comprised all music source details fully.

Summary of the invention

The purpose of this utility model is to overcome the deficiencies in the prior art, a kind of player that is used for vehicle-mounted or mini audio is provided, can decode and play as the USB flash disk of the digital music file of nondestructive compression types such as APE, FLAC or the SD cassette is vehicle-mounted and the mini audio digital audio-frequency player, also can decode and play simultaneously digital audio file as lossy compression method forms such as MP3, WMA.

According to the technical scheme that the utility model provides, the described player that is used for vehicle-mounted or mini audio comprises the DSP nuclear that has hardware accelerator, and described DSP nuclear is connected with ROM (read-only memory) and random access memory; Described DSP nuclear is connected with ahb bus, dma controller is connected with ahb bus by the bus master port of self, ahb bus is connected with analog-to-digital converting module with numeral by the APB peripheral bus, and the output of described numeral connects power amplifier; Also be connected with universal data interface on the described ahb bus.

Described universal data interface comprises I80 interface, SD/MMC memory card interface, USB OTG interface.Described ahb bus connects display screen and input media by described universal data interface.

Described DSP nuclear, ROM (read-only memory), random access memory, numeral, analog-to-digital converting module and the universal data interface that has hardware accelerator is integrated on a slice integrated circuit.

Described numeral adopts is 24 Delta-Sigma numeral.

The utility model has adopted stereo 24 bit Delta-Sigma DAC to carry out digital-to-analog conversion, utilizes the signal to noise ratio (S/N ratio) of superelevation to guarantee the high-quality reduction of decoded music, can decodes and plays lossless compression-encoding digital audio format (APE, Flac etc.); Audio decoder partly provides a kind of DSP+ hardware accelerator to carry out real-time decoding with less power consumption; Tonequality that its vehicle-mounted and mini audio are play is the same with CD perfect, and the reduction with power consumption of decreasing aspect cost makes advantages such as life-time dilatation.

Description of drawings

Fig. 1 is the utility model circuit structure block diagram.

Embodiment

The utility model is described in further detail below in conjunction with drawings and Examples.

As shown in Figure 1, application chip of the present utility model is embedded with DSP nuclear, random access memory ram and read only memory ROM, dma controller, USB OTG interface, stereo 24 bit Delta-Sigma numeral, 24 bit Delta-Sigma analog-to-digital converting modules, the LCM display screen of I80 interface, SD/MMC memory card interface.

DSP nuclear connects ROM (read-only memory) and random access memory; DSP nuclear is connected with ahb bus, dma controller is connected with ahb bus by the bus master port of self, ahb bus is connected with analog-to-digital converting module with numeral by the APB peripheral bus, and the output of described numeral connects amplifying circuit; Also be connected with universal data interface on the described ahb bus; Ahb bus connects display screen and input media (as button, touch panel) by universal data interface; Described universal data interface comprises I80 interface, SD/MMC memory card interface, USB OTG interface.

Described DSP nuclear adopts DSP+ hardware accelerator technology, and DSP nuclear carries out file/flow data to be handled, and goes back supervisory keyboard simultaneously, and display screen and storer etc. are so all programs all operate in internal processes space and the internal data space.Wherein the DSP+ hardware accelerator is finished the decoding of music.

Dma controller conducts interviews to storer in the system and register by its high performance bus master port (Master Interface).The program and the data-carrier store that comprise DSP.

The effect of random access memory ram, read only memory ROM is the program and the data-carrier store of inside solidification

USB OTG interface comprises interconnective USB controller and USB transceiver.The USB controller designs for pure digi-tal, and it is bearing data-transformation facility and control function between system and the USB PHY (Physical layer).The USB transceiver is the circuit that digital-to-analogue is mixed, and its effect is to finish the string and the conversion of transmission data and finish the USB physical layer protocol.

Numeral DAC is converted to simulating signal with digital signal, and analog-to-digital converting module ADC is a digital signal with analog signal conversion.

The SD/MMC interface is used to read and write outside SD/MMC card.

The I80 interface can be used for using outside sheet the memory device of I80 interface or LCM display screen to transmit and receive data.This I80 interface only is to finish the interrogation signal that the visit of AHB is converted into I80.

The APB peripheral bus bridge is a simple interface, the peripherals that its support property is lower.

The ahb bus bridge is mainly used in and connects the high performance system module, and it supports burst transfers of data mode and independent data transfer mode.

Use player described in the utility model to realize that the flow process of music under vehicle-mounted or the mini audio environment is as follows:

(1) after electric power system powered on, system carried out initialization operation;

(2) DSP nuclear drives USB controller or SD controller scanning USB transceiver or SD/MMC interface, detects whether there is audio file;

(3) if there is no audio file, then DSP nuclear drives the I80 interface show the information that does not have file to play on display screen, and repeating step (2);

(4) if there is audio file, at first DSP nuclear reads corresponding file and enters analog/digital conversion, secondly dma controller is read inner read only memory ROM or random access memory ram to data from analog/digital conversion ADC by peripheral bus bridge, the data in the storer being read in the DSP nuclear, realize the decoding of voice data jointly by the DSP+ hardware accelerator at last.

(5) decoded data are delivered among the numeral DAC by the external bus bridge;

(6) signal that comes out of numeral DAC plays back by power amplifier and loudspeaker;

Adopt the vehicle-mounted of this invention or mini audio card insert type digital audio-frequency player and play implementation method, because method real-time decoding under low frequency and low power consumption that this player decoding algorithm adopts the DSP+ hardware accelerator to combine, to make the audio file at the system decodes nondestructive compression type of low side DSP become possibility so, high-quality hearing enjoying can be provided, and the same perfect with the tonequality of CD.

Claims

1. a player that is used for vehicle-mounted or mini audio comprises the DSP nuclear that has hardware accelerator, it is characterized in that: described DSP nuclear is connected with ROM (read-only memory) and random access memory; Described DSP nuclear is connected with ahb bus, dma controller is connected with ahb bus by the bus master port of self, ahb bus is connected with analog-to-digital converting module with numeral by the APB peripheral bus, and the output of described numeral connects power amplifier; Also be connected with universal data interface on the described ahb bus.

2. the player that is used for vehicle-mounted or mini audio as claimed in claim 1 is characterized in that: described universal data interface comprises I80 interface, SD/MMC memory card interface, USB OTG interface.

3. the player that is used for vehicle-mounted or mini audio as claimed in claim 1 is characterized in that: described ahb bus connects display screen and input media by described universal data interface.

4. the player that is used for vehicle-mounted or mini audio as claimed in claim 1 is characterized in that: described DSP nuclear, ROM (read-only memory), random access memory, numeral, analog-to-digital converting module and the universal data interface that has hardware accelerator is integrated on a slice integrated circuit.

5. the player that is used for vehicle-mounted or mini audio as claimed in claim 1 is characterized in that: described numeral adopts is 24 Delta-Sigma numeral.