参数资料
型号: YMU757
元件分类: 音频合成
英文描述: TONE/MUSIC SYNTHESIZER, PDSO20
封装: TSSOP-20
文件页数: 22/42页
文件大小: 701K
代理商: YMU757
YMU757
#
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29-
One sound and volume level adjustment in 4 sound pronunciation
The volum e leveloutputted from DA C by the num berofthe pronunciation isdifferent.
When 1 sound (*)isoutputted from FM sound source,outputvoltage am plitude from DA C is0.375V p-p.
When m ore than one sound is pronounced atthe sam e time,outputvoltage am plitude varies in the phase of each
wave shape.
But,when the w ave shape of the sam e phase piles up,itbecom es 0.75V p-p by 2 sound,1.125V p-p by 3 sound,
1.5V p-p by 4 sound.
(*:The volum e adjustment(TotalLevelofCarrier)of1 sound isbeing explained with the prem ise of0dB.)
An assum ption in 300m W output.
Outputpow erfrom the speakeris300m W when RL is
;- and avoltagebetween SPOUT1 and 2 is1.55V rms.
BTL outputam plitude atthis time becomes 1.55×2×1.414=4.38V pp,and becom es 4.38/3.8=1.15V pp w ith the
EQ 3 terminal.
(Gain with the speakeram plifieris+11.6dB= 3.8 times.)
Securing a volum e levelby one sound.
Gain adjustmentin the partEQ am plifierisrecom m ended asthe way ofsecuring a volum e levelby one sound.
Gain dependson the resistance ratio ofR1 and R2,and itisGAIN=R2/R1.
Gain to recom m end isaboutfourtimesfrom three times.
+
DAC
R1
VREF
FM
VOL
HP
VOL
HPOUT
EQ 1
EQ 2
EQ 3
R2
SP
VOL
BTL Driver
+11.6dB
SPOUT1
SPOUT2
RL=8
-
FM sound
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