Noise tool and method

摘要

Apparatus for detecting acoustic disturbances include an electrical circuit for processing electrical signals generated by an acoustic sensor in response to acoustic disturbances. The processing circuitry converts the electrical data signals into output signals wherein the information about the input audio signals is carried by the frequencies of the output signals. High frequency signals may be isolated and processed to provide relatively low frequency digital pulse signals which may be readily transmitted over wirelines in a logging operation. The sensor apparatus may include a stack of piezoelectric crystals which are electrically connected by means of pressure contacts.