| 摘要 |
FIELD: instruments, in particular, analysis of voice signals in band voice encoders. SUBSTANCE: method involves separation of signal into segments which duration is greater than duration of pulse characteristics of band-pass filter, calculation of digital Fourier transform for each signal segment (number of nodes for digital Fourier transform is equal to double number of points in segment of analyzed signal), multiplication of signal spectrum by spectrum of pulse characteristics of filter, convolution of spectrum which is received by multiplication, using spectrum of rectangular aperture which length is equal to length of segment of analyzed signal, addition of convolution result to spectrum, which is received during processing of previous signal segment, by means of subtraction of convolution result from product of spectrums, detection of signal level at output of filter for time of this segment by means of generated added spectrum. When signal is analyzed, duration of analyzed signal is calculated simultaneously in several spectral bands by means of filter which pulse characteristics is maximal in time. Convolution of spectrum of product using spectrum of rectangular aperture is calculated s sum. Spectrum of processing of previous segment is calculated difference between even constituents of spectrum of product and corresponding constituents of spectrum which is resulted from convolution of odd constituents of spectrum of product and aperture. Real and imagine constituents of spectrum of signal segment are processed by means of independent flows in scalar representation. Constituents of spectrum of signal segment in each flow are multiplied by spectrum, absolute values of which constituents are equal to those of spectrum of pulse characteristics and sign of which is altered to opposite for each to constituents. EFFECT: increased functional capabilities. 4 cl, 2 dwg |
