TL7231MD Datasheet, PDF (15/37 Pages) Samsung semiconductor – FULL LAYER-III ISO/IEC 11172-3 AUDIO DECODER

TL7231MD
Bass boost control command(20h) is another form of tone control command(23h ~28h). It is
implemented by using the same filter as tone control command. Thus, if bass boost control
command is received with valid parameter value, gains and cutoffs are changed as follows;
l Bass gain and cutoff frequency of tone control are changed according to the parameter
value.
l Treble gain is changed to 0.
l Prescaling is set to –12dB to remove clipping noise.
l Tone control is enabled.
If bass boost command is received with invalid parameter value, the gains and cutoff
frequencies are not changed, and tone control is disabled. If a command related to tone control
is received, only the related gain or cutoff frequency is changed, and the command has no
effect on the tone control enable/disable and prescaling, and the information of bass boost
which is reported through HDO13 is not changed. For the tone control enable command(27h), it
just enables the tone control function, and has no effect on the gains and cutoff frequencies.
Tone control disable command(28h) disable tone control function, and change the bass boost
status which is reported through HDO13 to FFh(disable).
Prescaling has effect when tone control or equalizer is enabled or bass boost command is
received.
Equalizer consists of 6 bands, and band1 and band6 are shelving type, band2 to band5 are
peaking type. Since each band has relatively small Q value, correction matrix is automatically
used to complement this small Q value whenever attenuation value is set by using EQ gain
control commands(40h ~ 45h). It is not recommended that gain difference of neighbor bands
exceeds 10dB.
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