【摘要】 本系统以16位定点DSP芯片TMS320VC5509A(VC5509A)为核心设计并实现了一个数字化指向性扬声器。系统主要由TMS320VC5509A、模数转换器、数模转换器、超声功率放大器和超声换能器阵列等模块组成。采用近似开方补偿减小非线性失真,采用带动态载波的双边带调制算法进行幅度调制,所有的信号处理算法都在一片TMS320VC5509A上实现。使用双采样率和乒乓缓存结构,减小了系统计算量并便于复杂算法的实现。本设计方案具有性能高、成本低、开发效率高、便于维护和升级等优点。更多还原

【Abstract】 A kind of digital audiobeam loudspeaker is designed and implemented based on the 16-bit DSP chip TMS320VC5509A.The loud speaker system is composed of TMS320VC5509A,A/D converter,D/A converter,ultrasonic power amplifier and ultrasonic sensor array,etc.Approximate square root method is used to reduce the nonlinear distortion,and double side modulation with dynamic carrier algorithm is adopted to modulate the amplitude.All algorithms are implemented on a single chip TMS320VC5509A.The usage of double sampling and ping-pong structure can reduce the computation,thus providing more time for the realization of complex algorithms.The design has the advantages of excellent performance,low cost,high efficiency and easy maintenance and upgrade.更多还原