Based On The USB Interface Embedded Audio System Design

In the modern era of rapid development of technology, the development and application of audio has a long history, from the original analog signals, such as telephone signal, TV, audio signal to develop into a digital audio, now it is high quality audio applications, create conditions for audio applications in every field provides convenient feasible scheme. The paper studies the basic audio decoding method, it represents a MIDI encoding, coding is a set of instructions, rather than the audio signal waveform, the point is used in the music itself, computer rooms, Musical Instruments and synthesizer music information exchange a standard protocol. Audio system in embedded systems have been widely used in many embedded systems, is a key component of, and audio equipment is mainly used to complete sound data processing work. This paper, by SCM system for mobile storage equipment, and other types of audio data management, master unit USES singlechip, through the data storage device to decode the data bus transmission unit, thus completing audio decoding process, The voice signal to convert electrical signals by coding units to electrical signals, real-time, high quality and coding data through after encoding data bus transport to move in a storage device, thus completing audio encoding. This research mainly in three aspects:1. The interface technology combine with embedded,that can seamlessly switch between different interfaces, for future expansion of system functions to provide a guarantee.2.To study theory and coding of MIDI, under the design of the software programming to achieve the audio playback system functions and by modifying the optimization, get a good MIDI file playback.3. The combination of USB technology and MIDI, a person can achieve the effect of simultaneous operation of multiple instruments by MIDI file processing, the operation is simple and portable.