STV8206 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
'STV8206' PDF : 97 Pages View PDF
STV82x6
Audio Processor Block
required, it complements the dedicated prescaler for FM, NICAM or SCART sources. The internal
level can be measured using the peak detector.
The SVC can be used either in the Loudspeaker or Headphone path (but not both simultaneously).
When used in the Headphone path, the SVC prevents the sound level from becoming suddenly too
strong, causing ear damage. The SVC is configured in registers SVC_SEL and SVC_CTRL.
3.3 ST WideSurround
STV82x6 offers three preset ST WideSurround effects on the Loudspeaker path:
● Music, a concert hall effect
● Movie, for films on TV
● Simulated Stereo, which generates a pseudo-stereo effect from mono source
“ST WideSurround” is an extension of the conventional stereo concept which improves the spatial
characteristics of the sound. This could be done simply by adding more speakers and coding more
channels into the source signal as is done in the cinema, but this approach is too costly for normal
home use. The ST WideSurround system exploits a method of phase shifting to achieve a similar
result using only two speakers. It restores spatiality by adding artificial phase differences.
The Surround/Pseudo-stereo mode is automatically selected by the Automatic Standard
Recognition System (AUTOSTD) depending on the detected stereo or mono source. By default,
“Movie” is selected for Surround mode. This value may be changed to “Music” by the STS_MODE
bit in the LS_SRD_CTRL register.
Additional user controls are provided to better adapt the spatial effect to the source. The ST
WideSurround Gain (LS_STS_GAIN) and ST WideSurround Frequency (LS_STS_FREQ) registers
can be used to enhance music predominance in Music mode and theater effect + voice
predominancy in Movie mode.
3.4 5-Band Audio Equalizer
The Loudspeaker audio spectrum is split into 5 frequency bands and the gain of each of them can
be adjusted within a range from -12 dB to +12 dB in steps of 1 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 EQ_ON bit in the LS_EQ_CTRL register. The Bass, Medium and Treble values are
programmed in registers LS_EQ_BAND[1:5].
Figure 10: Equalizer
f1=100Hz f2=330Hz f3=1KHz f4=3.3KHz f5=6.6KHz
3.5 Bass/Treble Control
The gain of bass and treble frequency bands for the headphone can be also tuned within a range
from -12 dB to +12 dB in steps of 1 dB. It may be used to pre-define frequency band enhancement
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