Texas Instruments Corporation

Yoshito Higa

Hirohisa Yamaguchi

Rustin W Allred

A self-adaptive graphic equalizer operable to equalize the affects of an audio system on an audio signal includes an adaptive graphic equalizer having a plurality of equalizing filters, where the plurality of equalizing filters have different center frequencies equidistant from one another and spanning a predetermined audio bandwidth. Each equalizing filter is operable to filter an isub-band of the audio signal. A plurality of first filters are coupled to the audio system, each first filter is operable to filter an isub-band of an output signal of the audio system. A plurality of second filters are operable to filter an isub-band of the audio signal. A gain adjuster is operable to adjust the isub-band of the adaptive graphic equalizer in response to a difference in the isub-band of the filtered output signal from the plurality of first filters and the isub-band of the filtered audio signal from the plurality of second filters.

Digital self-adapting graphic equalizer and method

A technique for realizing high-speed and high-precision acoustic reproduction using acoustic speakers. The audio signal processing system has a sub-band analysis filter bank that divides the entire frequency band of an input audio signal into multiple sub-bands. Filter coefficient calculation circuits identify equalizable sub-bands and compares equalizable sub-bands and corresponding sub-bands from output audio signals in order to calculate filter coefficients. A sub-band convolution filter bank and a filter circuit perform frequency convolution on calculated filter coefficients for equalizable sub-bands and process input audio signals on the basis of this convolution.

Growing community of inventors

Ibaraki, Japan

Yoshito Higa