last update: 2001/02/05

Electrotechnical Laboratory, Futoshi Asano

Outline of TSP (Time-Stretched Pulse)

When an impulse is used as an input signal for measuring the impulse response of a system, SNR should be low.  In TSP, the energy of impulse is spread out over a certain period of time (TSP length)  and, after measuring the response (TSP response),  the scattered energy is collected  to reconstruct the impulse response.  The energy of the impulse is spread by the rule that the phase of TSP is shifted forward proportionally to the  square of the frequency.  To reconstruct the impulse response from the TSP response, the phase of the measured TSP response is shifted backward proportionally to the  square of the frequency.  This is accomplished by convolving the Inverse TSP.  For convolving Inverse TSP,  there are two methods, i.e., Linear Convolution and Circular Convolution.  

Documents

References

1. Y. Suzuki, F. Asano, H.-Y. Kim, and Toshio Sone, "An optimum computer-generated pulse signal suitable for the measurement of very long impulse responses", J. Acoust. Soc. Am. Vol.97(2), pp.-1119-1123, 1995

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Copyright (c) 1998-2001 Futoshi Asano, ETL