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Recovery of Low Frequency
response by Impulse Editing TM....
response by Impulse Editing TM....
What follows is a preliminary outline of an approach for recovering low frequency
system response form in-room measurement of the system's impulse response, and
appropriate editing of the impulse based on known system parameters. The study is
not complete but represents the first steps in the development of the procedure.
system response form in-room measurement of the system's impulse response, and
appropriate editing of the impulse based on known system parameters. The study is
not complete but represents the first steps in the development of the procedure.
Closing note:
In a typical DIY environment the reflection free portion of the impulse response would likely
extend to 3 or 4 msec. This corresponds to a low frequency limit of 250 to 333 Hz for the
reflection free impulse. Thus, it is anticipated that the long time approximation to the true impulse,
as given by Eq (15b) would be appended to the true impulse some what before 3 or 4 msec. As
an example, using 2.5 msec the "join point" would be at 400 Hz where there is clearly good
agreement between the true impulse and the long time approximation.
In a typical DIY environment the reflection free portion of the impulse response would likely
extend to 3 or 4 msec. This corresponds to a low frequency limit of 250 to 333 Hz for the
reflection free impulse. Thus, it is anticipated that the long time approximation to the true impulse,
as given by Eq (15b) would be appended to the true impulse some what before 3 or 4 msec. As
an example, using 2.5 msec the "join point" would be at 400 Hz where there is clearly good
agreement between the true impulse and the long time approximation.
Note: The symbol * is used to
denote convolution, not to be
confused with simple
multiplication.
denote convolution, not to be
confused with simple
multiplication.