Method and system for producing low-noise acoustical impulse responses at high sampling rate

A system for producing low-noise acoustical impulse responses at high sampling rates comprising:

• an excitation signal generator for producing exponential sine sweep signals that are sent through an acoustical system;
• a response measurement system for determining a measured impulse response of said acoustical system;
• a processor that controls said excitation signal generator and uses said measured impulse response to produce a low-noise measured impulse response by:
• running a first exponential sine sweep through said acoustical system up to the Nyquist frequency to provide an estimate of said acoustical system's response,
• sampling ambient noise entering said acoustical system determining, from said acoustical system's response and said ambient noise, a pass-band of said acoustical system;
• running a second exponential sine sweep through said acoustical system over said pass-band alone to produce an output signal, said second exponential sine sweep being slower than said first exponential sine sweep;
• and
• applying a band-pass filter to said output signal to suppress noise and produce a low-noise measured impulse response, said band pass filter having the same pass-band as said determined pass-band.