发明名称 |
Complex-Valued Synthesis Filter Bank with Phase Shift |
摘要 |
An apparatus for generating real-valued output audio samples is disclosed. The apparatus includes a memory that stores complex-valued input subband samples, real-valued demodulated samples, and the real-valued output audio samples. The apparatus also incudes a phase shifter that shifts a phase of the complex-valued input subband samples by an amount equal to a previously added phase shift and a complex-valued synthesis filter bank that generates the real-valued output audio samples in response to the complex-valued input subband samples, the real-valued demodulated samples, and prototype filter coefficients. |
申请公布号 |
US2017085250(A1) |
申请公布日期 |
2017.03.23 |
申请号 |
US201615364384 |
申请日期 |
2016.11.30 |
申请人 |
Dolby International AB |
发明人 |
Ekstrand Per |
分类号 |
H03H17/02;G06F17/11;H04R3/04 |
主分类号 |
H03H17/02 |
代理机构 |
|
代理人 |
|
主权项 |
1. An apparatus for generating real-valued output audio samples, the apparatus comprising:
memory that stores complex-valued input subband samples, real-valued demodulated samples, and the real-valued output audio samples; a phase shifter that shifts a phase of the complex-valued input subband samples by an amount equal to a previously added phase shift; and a complex-valued synthesis filter bank that generates the real-valued output audio samples in response to the complex-valued input subband samples, the real-valued demodulated samples, and prototype filter coefficients, wherein the complex-valued synthesis filter bank: shifts a first subset of the real-valued demodulated samples in the memory; multiplies the complex-valued input subband samples by a complex-valued exponential modulation matrix to generate complex-valued demodulated samples; stores the real part of the complex-valued demodulated samples in the memory as a second subset of the real-valued demodulated samples; extracts a third subset of the real-valued demodulated samples from the memory; multiplies the third subset of the real-valued demodulated samples by the prototype filter coefficients to generate windowed samples; combines the windowed samples to generate the real-valued output audio samples; and stores the real-valued output audio samples in the memory. |
地址 |
Amsterdam Zuidoost NL |