本文设计了一种数字化耳鸣康复仪。它根据耳鸣后效抑制试验和耳鸣掩蔽疗法提出的治疗方案，数字控制输出治疗耳鸣的多种掩蔽声(正弦波、啭音、噪音、随机、野外自然声），数字化调节输出频率和幅值。它采用“一机多控”多机通信的组网模式，实现了一名医生对多名患者同时治疗的智能化管理。 系统硬件电路包括音频数字信号源实现声音信号产生、数字声强级控制、多机数据通信、液晶显示和电源等模块单元。周期波形的产生采用了软件DDS 算法技术产生声音，利用单片机实现了高速、高精度波形、提高了音质、降低了噪音，使输出频率在50kHz 的范围内能达到1Hz 的精度和1%的波形失真度；采用一块具有2M字节的大容量SD卡来存储芯片播放多种模拟自然声；采用多级电阻衰减器网络控制掩蔽声声强级，由单片机自动切换实现了声级输出在130dB的范围内达到±0.5dB 的精度；系统采用嵌入式C8051F330 单片机作为主控芯片，它的D/A高速SPI接口等其丰富的内部资源和运行速度快的特点，简化了系统软硬件设计，实现了存储波形数据的快速存取。 系统计算机软件采用可视化的开发平台LabWindows/CVI6.0 实现操作界面和数据库的设计，实现电子病历、治疗方案和参数的设置、切换与显示，并包含有提示与帮助功能。数据库管理系统实现患者基本信息和治疗信息的自动存储与查询，提高了医生的工作效率，实现了治疗方案合理选取的科学性。通过自定义串行通信协议的CAN总线与音频数字信号源通信，简化了系统电路连接和软件设计。 该仪器样机经过几次改进，主要技术参数已经达到了厂家的要求，经北京医用声学检测中心的检验基本符合国家标准，已经进入临床检验阶段。

This paper introduces a detecting research of new digital instrument for curing tinnitus. It is based on the trial of aftereffect restraint and the shelter therapeutics. It can offer many shelter sounds includeing square wave, sine wave and random, natural sounds, regulate frequency and volume by digital. It’s made up of many audio frequency digital semaphores and a computer in order to meet the need of a doctor to manage some tinnitus sufferers. System hardware circuit audio digital signal source achieve this functions：Sound signals, sound intensity level control, data communications, liquid crystal display, alarm and power. The DDS technolog is used to produce periodic waves, it improves wave which make the distortion is within 1﹪, timbre and precision which is confined in 1Hz within 20kHz, debases noise. Compared with using a dedicated DDS chip costs by 80% ，the interface circuit is simplified. It use one SD chip to putout many natural sounds. The multi-level attenuation resistor network is used to control intensity, it confines precision in ±0.5dB within 130dB. C8051F330 single chip is used as the master chip to use its wealth of internal resources such as D/A and SPI interface and the characteristics of fast. The system hardware and software design are simplified .System integration is improved. The upper memory computer used LabWindows/CVI6.0 which is a visual software to design control panel and database which can save and query the sufferer’s informations. It can tune up curing protocols and parameters, display these correlative parameters and supply some helpful informations. It uses custom agreement and CAN bus to communicate with the semaphores and simplified hardware junctures. After a few to improvement ,the main technical parameters of prototypes of the equipment have reached the requirements of manufacturers, and acoustic detection by the Beijing Medical Center for testing in line with national standards ,has entered the clinical testing phase.