STA306

26/33

3.24 Bass and Treble Tone Control(address 1Bh)

The STA306 contains bass and treble tone control adjustments. These are selectable from +12dB to -12dB of

boost or cut. These are 1st order shelving filters with a corner frequency of 150Hz for bass and 3kHz for treble.

Any gain introduced in the tone controls will carry through to the volume and limiting block without saturation.

Table 12. Tone Control Boost/Cut as a function of BTC and TTC bits

3.25 Coefficient Address Register (address 1Ch)

3.26 Coefficient b2 Data Register Bits 23..16 (address 1Dh)

3.27 Coefficient b2 Data Register Bits 15..8 (address 1Eh)

BIT

D7

D6

D5

D4

D3

D2

D1

D0

NAME

TTC3

TTC2

TTC1

TTC0

BTC3

BTC2

BTC1

BTC0

RST

0

1

1

101

1

1

BTC(3..0)/TTC(3..0)

Boost/Cut

0000

-12dB

0001

-12dB

……

0111

-4dB

0110

-2dB

0111

0dB

1000

+2dB

1001

+4dB

……

1101

+12dB

1110

+12dB

1111

+12dB

BIT

D7

D6

D5

D4

D3

D2

D1

D0

NAME

CFA7

CFA6

CFA5

CFA4

CFA3

CFA2

CFA1

CFA0

RST

0

0

0

000

0

0

BIT

D7

D6

D5

D4

D3

D2

D1

D0

NAME

C1B23

C1B22

C1B21

C1B20

C1B19

C1B18

C1B17

C1B16

RST

0

0

0

000

0

0

BIT

D7

D6

D5

D4

D3

D2

D1

D0

NAME

C1B15

C1B14

C1B13

C1B12

C1B11

C1B10

C1B9

C1B8

RST

0

0

0

000

0

0