STA339BWS datasheet(71/79 Pages) STMICROELECTRONICS

71 / 79 page

DocID015276 Rev 8

71/79

STA339BWS

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/ms it is suggested to disable bit ZCE (Section 7.1.5 on

page 33) in order to avoid any audible pop noise.

7.15

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.

Table 84. Bit SVDWE description

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]

00000001

R_C0[15]

R_C0[14]

R_C0[13]

R_C0[12]

R_C0[11]

R_C0[10]

R_C0[9]

R_C0[8]

11101110

R_C0[7]

R_C0[6]

R_C0[5]

R_C0[4]

R_C0[3]

R_C0[2]

R_C0[1]

R_C0[0]

11111111

R_C1[23]

R_C1[22]

R_C1[21]

R_C1[20]

R_C1[19]

R_C1[18]

R_C1[17]

R_C1[16]

01111110

R_C1[15]

R_C1[14]

R_C1[13]

R_C1[12]

R_C1[11]

R_C1[10]

R_C1[9]

R_C1[8]

11000000

R_C1[7]

R_C1[6]

R_C1[5]

R_C1[4]

R_C1[3]

R_C1[2]

R_C1[1]

R_C1[0]

00100110

STA339BWS 数据表(PDF) 71 Page - STMicroelectronics

STA339BWS 数据表(HTML) 71 Page - STMicroelectronics

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79

数据表下载