TL7231MD datasheet(13/37 Pages) SAMSUNG

13 / 37 page

TL7231MD

SAMSUNG Electronics CO.

13/37

20h

1byte

Bass Boost

Control

(MP3 Only)

Control Bass boost. The upper nibble of the parameter

controls the cutoff frequency of bass boost, and the lower

nibble controls the level of bass boost. The value of

upper nibble should be in the range of 0 to 6. The cutoff

frequency is

× upper nibble + 50 (Hz).

If the values of the lower nibble is in the range of 0 to 12,

the low frequency band below the cutoff frequency is

boosted by 0dB ~ 18dB (1.5dB step). The other values

mean no boost. For example, if the parameter value is

42h, then the cutoff frequency will be 25

×4+50=150Hz,

and the frequency band below 150Hz will be boosted by

3dB compared to the upper frequency band. In case of

using bass boost, volume is reduced by 1.5

× n dB where

n means the parameter value. The reset value is

FFh(disabled).

21h

1byte

Volume Control

Control volume. The parameter should have the value of

range from 0 to 255. If the value is n, the volume is

attenuated by n/2 dB compared to maximum volume. The

reset value is 0.

22h

1byte

Prescale Control

Control the prescaling. The parameter is a signed value

and can be -128 to 127. The prescaling is done by 0.5

n dB according to parameter value n. That is, 0h ~ 7Fh

means 0dB ~ 63.5dB scaling, 80h ~ FFh means –64dB ~

-0.5dB scaling. The reset value is 0dB.

23h

1byte

Tone Control –

Bass Gain

(MP3 Only)

Control the Bass Gain. The parameter is a signed value

and can be -128 to 127. The gain can be 0.5

× n dB

according to parameter value n. The reset value is 0.

24h

1byte

Tone Control –

Treble Gain

(MP3 Only)

Control the Treble Gain. The parameter is a signed value

and can be -128 to 127. The gain can be 0.5

× n dB

according to parameter value n. The reset value is 0.

25h

1byte

Tone Control –

Bass Cutoff

(MP3 Only)

Control the Bass Cutoff Frequency. The parameter can

have the value of 0 to 255. The cutoff frequency can be

20 + 5

× n Hz according to parameter value n. The reset

value is 0.

26h

1byte

Tone Control –

Treble Cutoff

(MP3 Only)

Control the Treble Cutoff Frequency. The parameter can

have the value of 0 to 255. The cutoff frequency can be

5000 + 20

× n Hz according to parameter value n. The

reset value is 0.

27h

none

Tone Control –

Enable

(MP3 Only)

Enable the Tone Control Function. Tone Control Function

is disabled when reset.

28h

none

Tone Control –

Disable

(MP3 Only)

Disable the Tone Control Function. Tone Control Function

is disabled when reset.

30h

none

MP3 CRC Bypass

(MP3 Only)

During MP3 decoding, even if the input bit stream

contains the CRC field, TL7231MD doesn’t check the

CRC error. After reset, TL7231MD is set to check CRC

error.

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