In This Section
Clean Audio for TV broadcast: An Object-Based Approach for Hearing-Impaired Viewers - April 2015
Audibility of a CD-Standard A/DA/A Loop Inserted into High-Resolution Audio Playback - September 2007
Sound Board: Food for Thought, Aesthetics in Orchestra Recording - April 2015
AES Journal Forum
A Recursive Adaptive Method of Impulse Response Measurement with Constant SNR over Target Frequency Band
Although an impulse response is the output from a linear system when excited by a pulse, such responses cannot be obtained with a high signal-to-noise ratio (SNR) because the pulse has low energy. Swept sine signals and maximum length sequences are alternative inputs, however, conventional signals still have low SNR problems in some frequency bands. This study is based on a swept-sine that maintains a constant SNR regardless of the frequency. The spectrum of a measurement signal is shaped, adapting to not only the background noise spectrum but also the recursively estimated transfer function of the system itself. To verify the validity of the proposed method, the authors measured the room impulse response in a noisy environment and calculated the room frequency response. The experimental result showed that a frequency response with an almost constant SNR was obtained with two iterations. This approach is useful in reverberation time measurements.
Download Now (919 KB)
No AES members have commented on this paper yet.
Subscribe to this discussion
Start a discussion!
If you are not yet an AES member and have something important to say about this paper then we urge you to join the AES today and make your voice heard. You can join online today by clicking here.