设计一数字 频率计，其技术要求如下： (1) 测量频率范围：1Hz~100kHz。 (2) 准确度Dfx/fx£ ± 2%。 (3) 测量信号：方波，峰峰值为3V~5V。-design a figure frequency meter, the technical requirements are as follows : (a) measuring frequency range : 1Hz - 100kHz. (2) the accuracy Dfx / fxpound 2%. (

基于DSP的DTMF产生与检测 C语言编程，包括产生与峰值检测。-DSP-based DTMF generation and detection of C language programming, including the generation and peak detection.