参数资料
型号: EVAL-ADAU1761Z
厂商: Analog Devices Inc
文件页数: 44/92页
文件大小: 0K
描述: BOARD EVAL FOR ADAU1761
标准包装: 1
系列: SigmaDSP®
主要目的: 音频编解码器
嵌入式: 是,DSP
已用 IC / 零件: ADAU1761
主要属性: 立体声,24 位,8 ~ 96 kHz 采样率,GUI 工具
次要属性: I²C 和 GPIO 接口,2 差分和 1 个立体声单端模拟输入和输出
已供物品: 2 个板,线缆,CD
产品目录页面: 776 (CN2011-ZH PDF)
相关产品: ADAU1761BCPZ-RL-ND - IC SIGMADSP CODEC PLL 32LFCSP
ADAU1761BCPZ-R7-ND - IC SIGMADSP CODEC PLL 32LFCSP
ADAU1761BCPZ-ND - IC SIGMADSP CODEC PLL 32LFCSP
ADAU1761
Rev. C | Page 49 of 92
SOFTWARE SLEW
When the values of signal processing parameters are changed
abruptly in real time, they sometimes cause pop and click
sounds to appear on the audio outputs. To avoid pops and
clicks, some algorithms in SigmaStudio implement a software
slew functionality. Algorithms using software slew set a target
value for a parameter and continuously update the value of that
parameter until it reaches the target.
The target value takes an additional space in parameter RAM,
and the current value of the parameter is updated in the non-
modulo section of data RAM. Assignment of parameters and
nonmodulo data RAM is handled by the SigmaStudio compiler
and does not need to be programmed manually.
Slew parameters can follow several different curves, including
an RC-type curve and a linear curve. These curve types are
coded into each algorithm and cannot be modified by the user.
Because algorithms that use software slew generally require more
RAM than their nonslew equivalents, they should be used only
in situations where a parameter will change during operation of
the device.
Figure 70 shows an example of volume slew applied to a sine wave.
07
680
-07
0
INITIAL
VALUE
SLEW
CURVE
NEW TARGET
VALUE
Figure 70. Example of Volume Slew
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