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ADAU1373BCBZ-R7 Datasheet(PDF) 63 Page - Analog Devices |
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ADAU1373BCBZ-R7 Datasheet(HTML) 63 Page - Analog Devices |
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63 / 296 page  ADAU1373 Rev. 0 | Page 63 of 296 COEFFICIENT CALCULATIONS Peak Filter Setting With fS as the input signal sampling frequency, fC as the required peak filter center frequency, BW as the bandwidth, and G (dB) as the gain, use the following steps for coefficient calculation: 1. Transfer the gain in decibels (dB) to decimal domain. 20 10 G k = 2. Calculate the double precision coefficients. ) 2 cos( )) 2 sin( 1 ( π π α × × − = S S f BW f BW ) 2 cos( π β × = S C f f 2 ) 1 ( ) 1 ( α × − + + = k k p0 β α × + − = ) 1 ( p1 2 ) 1 ( ) 1 ( α × + + − = k k p2 β α × + = ) 1 ( d1 α − = d2 3. Transfer the double precision coefficients to integer values represented by registers. p0 = round(p0 × 8192) p1 = round(p1 × 8192) p2 = round(p2 × 8192) d1 = round(d1 × 8192) d2 = round(d2 × 8192) 4. Transfer the decimal integer values to 16-bit, twos complement hexadecimal values. Low-Pass Shelving Filter The low-pass shelving filter transfer function is 1 1 1 ) ( − − × − × + = z d1 z p1 p0 z H With fS as the input signal sampling frequency, fC as the required filter cutoff frequency, and G (dB) as the gain, use the following steps for coefficient calculation: 1. Transfer the gain in decibels (dB) to decimal domain. 20 10 G k = 2. Calculate the double precision coefficients. ) 2 cos( )) 2 sin( 1 ( π π α × × − = S C S C f f f f 2 ) 1 ( ) 1 ( α × − + + = k k p0 2 ) 1 ( ) 1 ( α × + + − = k k p1 α = d1 3. Transfer the double precision coefficients to integer values represented by registers. p0 = round(p0 × 8192) p1 = round(p1 × 8192) d1 = round(d1 × 8192) 4. Transfer the decimal integer values to twos complement hexadecimal values. High-Pass Shelving Filter The high-pass shelving filter transfer function is 1 1 1 ) ( − − × − × + = z d1 z p1 p0 z H With fS as the input signal sampling frequency, fC as the required filter cutoff frequency, and G (dB) as the gain, use the following steps for coefficient calculation: 1. Transfer the gain in decibels (dB) to decimal domain. 20 10 G k = 2. Calculate the double precision coefficients. ) 2 cos( )) 2 sin( 1 ( π π α × × − = S C S C f f f f 2 ) 1 ( ) 1 ( α × − − + = k k p0 2 ) 1 ( ) 1 ( α × + − − = k k p1 α = d1 3. Transfer the double precision coefficients to integer values represented by registers. p0 = round(p0 × 8192) p1 = round(p1 × 8192) d1 = round(d1 × 8192) 4. Transfer the decimal integer values to twos complement hexadecimal values. |
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