STA369BW datasheet(76/88 Pages) STMICROELECTRONICS

76 / 88 page

STA369BW

76/88

Doc ID 022033 Rev 1

When SVUPE = 1 the fade-in rate is defined by the SVUP[4:0] bits according to the following

formula:

Fade-in rate = 48 / (N + 1) dB/ms

where N is the SVUP[4:0] value.

When SVDWE = 1 the fade-out rate is defined by the SVDW[4:0] bits according to the

following formula:

Fade-in rate = 48 / (N + 1) dB/ms

where N is the SVDW[4:0] value.

Note:

For fade-out rates greater than 6 dB/msec it is suggested to disable the CPWMEN bit

(Section 7.24.4 ) and ZCE bit (Section 7.5.7) in order to avoid any audible pop noise.

7.20

DRC RMS filter coefficients (addr 0x39-0x3E)

Signal level detection in DRC algorithm is computed using the following formula:

y(t) = c0 * abs(x(t)) + c1 * y(t-1)

where x(t) represents the audio signal applied to the limiter, and y(t) the measured level.

SVDWE

Mode

When volume is decreased, use the default rate

When volume is decreased, use the rates defined by SVDW[4:0]

R_C0[23]

R_C0[22]

R_C0[21]

R_C0[20]

R_C0[19]

R_C0[18]

R_C0[17]

R_C0[16]

R_C0[15]

R_C0[14]

R_C0[13]

R_C0[12]

R_C0[11]

R_C0[10]

R_C0[9]

R_C0[8]

R_C0[7]

R_C0[6]

R_C0[5]

R_C0[4]

R_C0[3]

R_C0[2]

R_C0[1]

R_C0[0]

R_C1[23]

R_C1[22]

R_C1[21]

R_C1[20]

R_C1[19]

R_C1[18]

R_C1[17]

R_C1[16]

R_C1[15]

R_C1[14]

R_C1[13]

R_C1[12]

R_C1[11]

R_C1[10]

R_C1[9]

R_C1[8]

R_C1[7]

R_C1[6]

R_C1[5]

R_C1[4]

R_C1[3]

R_C1[2]

R_C1[1]

R_C1[0]

STA369BW Datasheet(PDF) 76 Page - STMicroelectronics

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