參數(shù)資料
型號(hào)： M65817AFP
廠商： Mitsubishi Electric Corporation
英文描述： Digital Amplifier Processor of S-Master Technology
中文描述： 數(shù)字放大器處理器的S - Master技術(shù)
文件頁(yè)數(shù)： 19/28頁(yè)
文件大?。?/td> 246K
代理商： M65817AFP
19
Digital Amplifier Processor of S-Master* Technology
M65817AFP
MITSUBISHI SOUND PROCESSOR ICs
MITSUBISHI
ELECTRIC
The Soft Mute function is executed by setting of Gain Data as 00000/00000000b
( "/" :means dividing point between index part and mantissa part).
The release from Soft Mute function must be executed by setting the gain data before soft mute.
The Soft Mute function and release from Soft Mute function don't have linear curve but
have characteristics of approximate exponential curve.
Output amplitude
16
T = xxxx/Fs(sec)
0
t
Characteristics of Soft Mute function
Operating time of Soft Mute
Total steps from MAX value(10100b/11111111b) to MIN value(00000b/00000000b) are
(128steps/1index)
×
(20 indexes(10100b-10000b)) + 256steps =2816steps.
The transition term of up and down depend on 2fso clock.
Therefore, in case of fso=48kHz, T=1/2fso=10.416μsec/step, transition term are following.
From MAX value (10100b/11111111b) to MIN value (00000b/00000000b) : 2816T=29.333msec.
From 0dB value(10100b/11111111b) to MIN value(00000b/00000000b) : 2304T=24.000msec.
6dB transition term (when over 00000b/10000000b(=-96dB) values): 128T=1.333msec.
Soft Attenuate.
Transition from older Gain Attenuation to newer Gain Attenuation always operates with Soft Mute function.
For example, in case of Gain1 > GAIN3 > GAIN2, transition process is shown below.
First, GAIN1 is operated, then second, GAIN2 is operated.
In case that GAIN2 is operated faster than GAIN1of transition completion("A" situation in figure),
GAIN1 is ignored and data approaches at GAIN2 .
Further, GAIN3 is operated faster than GAIN2 of transition completion("B" or "C" situation in figure),
GAIN2 is ignored and data approaches at GAIN3 .
Soft Attenuate
T
T
0.5
00000/00000000b setting
10000/10000000b setting
A
(GAIN1)
B
(GAIN3)
(GAIN2)
C
1.0
0
-1.0
t
Gain
Soft Mute.
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