Abstract: An analysis filter bank corresponding to multiple sub-bands, which performs frequency-division filtering on an input signal to generate multiple sub-band signals, the analysis filter bank comprising: a sub-band response pre-compensator which performs a linear filtering on the input signal to generate a response pre-compensated signal, multiple sub-filters with different central frequencies, which perform complex-type first-order infinite impulse response filtering respectively on the response pre-compensated signal to generate multiple sub-filter signals, and multiple binomially-combining and rotating devices based on a set of binomial weights, each of which performs a weighted summation on at least two of the sub-filter signals with the set of binomial weights, and rotates a weighted-summation result with a rotating phase according to a corresponding sub-band central frequency to generate one of the sub-band signals, wherein the at least two of the sub-filter signals are generated by at least two of the sub-

Abstract: A joint spectral gain adaption module, which comprises: an aided-ear loudness model, wherein an aided-ear loudness spectrum is obtained by performing computations on an aided-ear threshold elevation profile and a spectrum selected from the group consisting of an input spectrum and a first spectrum derived from the input spectrum; a bare-ear loudness model, wherein a bare-ear loudness spectrum is obtained by performing computations on a bare-ear threshold elevation profile, and a modified spectrum previously obtained; and a spectrum shaping sub-module, wherein the modified spectrum previously obtained is passed to the bare-ear loudness model as an input, and a modified spectrum and a linear spectral gain vector are obtained by performing computations on the input spectrum, the bare-ear loudness spectrum, and a loudness spectrum selected from the group consisting of the aided-ear loudness spectrum and a first loudness spectrum derived from the aided-ear loudness spectrum.

Abstract: A human hearing test method relates to the following procedures: a musical note from a pre-recorded music in a storage device is loaded by a controller; a next test sound is then selected and played randomly from one of the pre-designed octaves and test frequency bands by using a random number and the musical note loaded by the controller; the sound level of the next test sound is then increasing or decreasing determined by a testing subject's last response to the last test sound and its sound level loaded by the controller from the data recorded earlier in the storage device; a next test sound is determined by the corresponding sound octave number and the musical note loaded by the controller from the storage device, and by the sound level of the test sound.