Reciprocal maximum-length sequence pairs for acoustical dual source measurements.

Area of Science:

• Acoustics
• Signal Processing
• System Identification

Background:

• Accurate measurement of impulse responses is crucial for understanding acoustical systems.
• Simultaneous measurements from multiple sources are challenging and time-consuming.
• Existing methods often require sequential measurements, limiting efficiency.

Purpose of the Study:

• To propose and demonstrate a novel method for obtaining simultaneous dual source-receiver impulse responses in acoustical systems.
• To enable efficient system identification in environments with multiple sound or vibration sources.
• To reduce the time required for complex acoustical measurements.

Main Methods:

• Utilizing binary maximum-length sequences (MLS) and their reciprocal pairs for excitation.
• Employing cross-correlation techniques to extract impulse responses from dual sources.
• Implementing a fast MLS transform algorithm for efficient cross-correlation computation.

Main Results:

• Successful simultaneous measurement of dual source-receiver impulse responses was achieved.
• The reciprocal MLS pair property enables effective cross-correlation measurements.
• Experimental results validated the feasibility and usefulness of the proposed method.

Conclusions:

• The proposed method offers an efficient solution for simultaneous impulse response measurements in acoustical systems.
• This technique significantly benefits system identification tasks involving multiple sources and receivers.
• The use of reciprocal MLS pairs and fast algorithms enhances measurement speed and accuracy.