Patent ID: 8107632
Filing Date: 2012-01-31
Classification: H04S

Abstract:
1. A digital signal processing apparatus for reproducing an impulse response that represents an acoustic transfer characteristic, the apparatus comprising: a first digital filter that reproduces, at a first sampling rate, a direct acoustic part of the impulse response; a second digital filter that reproduces, at a second sampling rate different than the first sampling rate, a reflected acoustic part of the impulse response; and a sampling-rate changing filter having a constant group-delay time characteristic and including at least one plurality of series-connected delay circuits, each one of the delay circuits providing a respective delay of one sampling period, the number of such delay circuits in the at least one plurality of delay circuits being determined by a duration of an anacoustic part of the impulse response and being a particular value that results in the delay circuits combining to delay a start of the reflected acoustic part of the impulse response for a specific delay time that is substantially equal to the duration of the anacoustic part of the impulse response, the anacoustic part of the impulse response thereby being reproduced between an end of the direct acoustic part of the impulse response and the start of the reflected acoustic part of the impulse response.