STA381BWTR Datasheet, PDF (147/174 Pages) STMicroelectronics – Sound Terminal® 2.1-channel high-efficiency digital audio system

STA381BW
Register description: Sound Terminal compatibility
7.16.3
Extended attack rate
The attack rate shown in Table 146 can be extended to provide up to an 8 dB/ms attack rate
on both limiters.
XAR1
0
1
Table 155. Extended attack rate, limiter 1
Mode
Limiter1 attack rate is configured using Table 146
Limiter1 attack rate is 8 dB/ms
XAR2
0
1
Table 156. Extended attack rate, limiter 2
Mode
Limiter2 attack rate is configured using Table 146
Limiter2 attack rate is 8 dB/ms
7.16.4
Extended BIQUAD selector
Bass and treble controls can be configured as user-defined filters when the equalization
coefficients link is activated (BQL = 1) and the corresponding BQx bit is set to 1.
BQ5
0
1
Table 157. Extended biquad selector, biquad 5
Mode
Reserved
User-defined biquad 5 coefficients are selected
BQ6
0
1
Table 158. Extended biquad selector, biquad 6
Mode
Pre-set bass filter selected as per Table 145
User-defined biquad 6 coefficients are selected
BQ7
0
1
Table 159. Extended biquad selector, biquad 7
Mode
Pre-set treble filter selected as per Table 145
User-defined biquad 7 coefficients are selected
Note:
When filters from the 5th to 7th are configured as user-programmable, the corresponding
coefficients are stored respectively in addresses 0x20-0x24 (BQ5), 0x25-0x29 (BQ6), 0x2A-
0x2E (BQ7) as given in Table 152.
BQx bits are ignored if BQL = 0 or if DEMP = 1 (relevant for BQ5) or CxTCB = 1 (relevant for
BQ6 and BQ7).
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