Method for compressing the dynamic range of measured signals

摘要

A sonar system is provided with the system having comparatively reduced power consumption, data bandwidth and data storage requirements. A sensor array of the system is configured to a sleep mode, low-resolution mode and high-resolution mode. In the sleep mode, all sonar sensors are configured in the mode and no acoustic signals are detected or processed. In the low-resolution mode, a limited number of sonar sensors are powered and acoustic signals received by the sensors are processed with reduced bandwidth and dynamic range, and then stored on a data storage device. In the high-resolution mode, the acoustic signals detected by the sonar sensors are processed with full signal bandwidth and dynamic range and then stored on the data storage device. A 10 bit mu-Law encoding scheme is used to reduce the amplitude scale of measurement or dynamic range of the digitized acoustic signals.

主权项

1. A method of processing acoustic signals, said method comprising the steps of:
providing acoustic signals from a sonar sensor array; sampling the provided acoustic signals at a sample rate to produce sampled acoustic signals; digitizing the sampled acoustic signals with an analog-to-digital converter to produce digitized acoustic signals having a first predetermined format and a first amplitude scale of measurement; and compressing the digitized acoustic signals with a 10 bit mu-Law encoding scheme to produce compressed signals having a second amplitude scale of measurement.