STV8287D View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
STV8287D
STMicroelectronics
'STV8287D' PDF : 149 Pages View PDF
STV82x7
Dedicated Digital Signal Processor (DSP)
The SVC is implemented on the loudspeakers path, headphone path or on both in parallel
(independent settings). Also, the SVC can be applied in six-channel mode (L, R, LS, RS, C and
SubW).
4.9 ST Dynamic Bass
STV82x7 offers dynamic bass boost processing on the Loudspeakers path:
ST Dynamic Bass is a bass boost process that can dramatically increase the bass content of any
program without any output level saturation.
3 cutoff frequencies (BASS_FREQ) can be chosen, 100Hz, 150Hz and 200Hz to adapt the effect to
your loudspeakers. The amount of bass (BASS_LEVEL) can also be fine tuned in order to adapt the
effect loudness.
4.10 5-Band Audio Equalizer
The loudspeakers audio spectrum is split into 5 frequency bands and the gain of each of band can
be adjusted within a range from -12 dB to +12 dB in steps of 0.25 dB. The Audio Equalizer may be
used to pre-define frequency band enhancement features dedicated to various kinds of music or to
attenuate frequency resonances of loudspeakers or the listening environment. The Equalizer is
enabled by the LS_EQ_ON bit in the LS_EQ_BT_CTRL register. The gain value for Band X is
programmed in register EQ_BANDX_GAIN.
The 5-Band Audio Equalizer is exclusive with Bass-Treble control. Bit LS_EQ_BT_SW in register
LS_EQ_BT_CTRL is used to select either the 5-Band Audio Equalizer or the Bass-Treble control for
the Loudspeakers path.
Depending on the LS Equalizer or LS Bass-Treble value, the volume level can be clamped to the LS
output to prevent any possible signal clipping from occuring using the ANTICLIP_LS_VOL_CLAMP
bit in the VOLUME_MODES (D7h) register.
Figure 18: Equalizer
f1 = 100 Hz, f2 = 316 Hz, f3 = 1 kHz, f4 = 3.16 kHz and f5 = 10 kHz
4.11 Bass/Treble Control
The gain of bass and treble frequency bands for Headphone can be also tuned within a range from
-12 dB to +12 dB in steps of 0.25 dB. It may be used to pre-define frequency band enhancement
features dedicated to various kinds of music. The Headphone Bass/Treble feature is enabled by
setting the HP_BT_ON bit in the HP_BT_CONTROL register. The Bass and Treble gain values are
adjusted in registers HP_BASS_GAIN and HP_TREBLE_GAIN, respectively.
Depending on the HP Bass-Treble value, the volume level can be clamped to the HP output to
prevent any possible signal clipping from occuring using the ANTICLIP_HP_VOL_CLAMP bit in the
VOLUME_MODES (D7h) register.
35/149
Share Link: 