STA323W datasheet(64/77 Pages) STMICROELECTRONICS

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User-programmable settings

STA323W

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8.4

Mix/bass management

The STA323W provides one post-EQ mixing block per channel. Each channel has two

mixing coefficients, which are each 24-bit signed fractional multipliers, that correspond to

the two channels of input to the mixing block. These coefficients are accessible via the User

Controlled Coefficient RAM described below. The mix coefficients expressed as 24-bit

signed, fractional numbers in the range +1.0 (8388607) to -1.0 (-8388608), are used to

provide three channels of output from two channels of filtered input.

Figure 50.

Mix/bass management block diagram

After mixing, STA323W also permits the implementation of crossover filters on all channels

corresponding to 2.1 bass management operation. Channels 1 and 2 use a 1st order, high-

pass filter and channel 3 uses a 2nd-order low-pass filter corresponding to the setting of the

XO bits of I2C register 0x0C. If XO = 000, user specified crossover filters are used.

By default these coefficients correspond to pass-through. However, the user can write these

coefficients in a similar way as the EQ biquads. When user-defined setting is selected, the

user can only write 2nd-order crossover filters. This output is then passed on to the Volume

and Limiter block.

C1MX1

High pass

filter

C1MX2

Channel #1

from EQ

Channel #2

from EQ

Channel #1

to GC/vol

C2MX1

High pass

filter

C2MX2

Channel #2

to GC/vol

C3MX1

Low pass

filter

C3MX2

Channel #3

to GC/vol

Crossover frequency determined

by XO setting.

User defined when XO = 000

User defined mix coefficients

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