參數(shù)資料
型號： KD16901
廠商： SAMSUNG SEMICONDUCTOR CO. LTD.
英文描述： Audio Effect Processor(音頻效果處理器)
中文描述： 音頻效果器（音頻效果處理器）
文件頁數(shù)： 27/68頁
文件大?。?/td> 381K
代理商： KD16901
AUDIO EFFECT PROCESSOR
FUNCTIONAL DESCRIPTION
3-27
Spectrum Analyzer
The spectrum analyzer displays the power of each equalizer band output. The band number in spectrum analyzer
is identical to that in graphic equalizer except for the 3-band equalizer mode.
In this case, the spectrum analyzer follows 7-band equalizer mode in spite of the 3-band equalizer mode being
selected. The 16 bit analyzer outputs are transformed to generate a byte value (256 levels), which can be applied
to an external LCD or other display devices. At each input sample, only one band output power is calculated in
every sampling period, because it is not necessary to display all band power at each sampling period. (At 44.1 KHz
sampling frequency, the period is only 0.0227 msec)
Vocal Canceller
The structure of vocal canceller function used in the KD16901 is given in Figure 18.
Figure 18. Structure of Vocal Canceller
This structure is based on the fact that the vocal component in music sound is center channel component (i.e.,
mono). Thus, subtracting left signal from right signal, the signal in the low line from above diagram has no vocal
component. However, there are lots of loss in other signal components. For instance, since drum beat is usually
mono, it also disappears after the vocal cancellation. The process in the upper line compensates this loss of some
components. The added two signal is filtered by a band stop filter in which the lower and upper cutoff frequencies
are 120 Hz and 10 KHz respectively. Thus, the stereo components below 120 Hz and above 10 KHz are
emphasized, whereas the vocal components between cutoff frequencies are eliminated. To obtain the left and the
right signals, the filtered signal is subtracted from the lower part of signals to obtain the left signal, and is added to
the lower part of signal to obtain the right signal.
Left input
Right input
+
-
+
Band Stop
Filter
-
Right output
Left output
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