Portable acoustic impedance data acquisition and analysis system

Claim 1

A portable acoustic impedance data acquisition and processing system comprising: a. an audio source, comprising a digital audio tape player having a mini disc storage, for providing an audio output test signal; b. a test head including a cylindrical waveguide having an open test end adapted to be placed against a test object, first and second pressure transducers mounted in the wall of the cylindrical waveguide flush with the interior wall thereof, with the first pressure transducer being positioned near the open end of the waveguide, and the second pressure transducer being spaced along the cylindrical waveguide from the first pressure transducer, and an acoustic signal generator for producing an acoustic signal within the cylindrical waveguide; c. a power amplifier, coupled to the audio source, for amplifying the audio output test signal, and directing the amplified audio output signal to the acoustic signal generator of the test head; d. an audio recorder, comprising a digital audio tape recorder having a mini disc storage, coupled to the outputs of the first and second pressure transducers, for recording the outputs of the first and second pressure transducers, whereby the portable acoustic impedance data acquisition system is completely compatible with standard personal computers; e. a battery power supply for providing electrical power to the audio source, the first and second pressure transducers, the power amplifier, and the audio recorder, such that the data acquisition system is completely portable; f. an audio player for playing back acoustic data signals previously recorded by the audio recorder; g. a spectral analyzer, coupled to the audio player, which is programmed to perform desired acoustic analyses on the recorded acoustic data signals; h. a printer, coupled to the spectral analyzer, for printing output graphs or reports as directed; and g. a modem transmitter for transmitting the output of the audio player via a telephone connection to a remote modem receiver; and the spectral analyzer is coupled to the remote modem receiver, and is programmed to perform desired acoustic analyses on the recorded acoustic data signals.