A method to process virtual surround sound signal of 5.1 access

A method to process virtual surround sound signal of 5.1 access

  • CN 1,953,620 B
  • Filed: 09/05/2006
  • Issued: 04/02/2014
  • Est. Priority Date: 09/05/2006
  • Status: Active Grant
First Claim
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1. 5.1 path virtual surround sound signal processing methods, is characterized in that, it comprises the steps and treatment conditions:

  • The first step is inputted 5.1 original path surround sound time-domain signal l 0, r 0, c 0, ls 0, rs 0, lfe 0;

    Second step is by left and right signal l 0, r 0carry out and difference operation, obtain signal m 1=l 0+ r 0and s 1=l 0-r 0, respectively by signal m 1and s 1the impulse response obtaining via 30 °

    of related transfer function without auricle, ear canal of horizontal plane and zero pole cancellation algorithm is σ

    1and δ

    1128 or 64 time domain FIR filters of simplification carry out filtering, obtain signal m 1* σ

    1and S 1* δ

    1;

    Wherein calculate σ

    1and δ

    1as follows with the method that is reduced to 128 or 64 filters;

    By the method for interpolation, the sample frequency of the forms of time and space of original HRIR is become to 48kHz, and adopt the method for time domain zero padding, by (4) formula, calculate 1024 transfer function ∑

    s of frequency domain of two filters 1, Δ

    1, to carry out, after inverse Fourier transform, obtaining sample frequency 48kHz, the original pulse response of two filters that length is 1024, is designated as respectively σ

    1(n), δ

    1(n), n=0,1......1023;

    The transfer function of two filters is;



    1=0.707[A′



    L

    ω

    )+A′



    R

    ω

    )]Δ

    1=0.707[A′



    L

    ω

    )-A′



    R

    ω

    )] (4) A '"'"' (θ

    wherein l, ω

    ) and A '"'"' (θ

    r, be ω

    ) to get respectively θ



    in following formula l=30 °

    , θ



    r=-30 °

    obtain;

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