Ultrasonic Signal Time-Expansion Using DAC Frequency Modulation

Vibration

article

Massimiliano Rossi¹  Marco Frasca¹ 

[1] MBDA Italia S.p.A.

关键词: ultrasound;    time-expansion;    DAC;   

DOI  :  10.3390/vibration6030029

学科分类：土木及结构工程学

来源: mdpi

【 摘 要 】

Ultrasonic signals can be conveniently recorded using modern high-speed analog-to-digital converters and analyzed through digital signal processing algorithms. Sometimes, in some applications, such as in bioacoustics, it is necessary to convert digital data to analog signals with a special transformation that allows compressing and translating the spectrum toward audible frequencies. The process is called time expansion and can be conveniently achieved by slowing down the frequency clock of a digital-to-analog converter. This paper analyzes in detail the spectral characteristics of a time-expanded signal.

【 授权许可】

CC BY