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参数资料
| 型号： | YMU757B-Q |
| 元件分类： | 音频合成 |
| 英文描述： | TONE/MUSIC SYNTHESIZER, PQCC20 |
| 封装： | QFN-20 |
| 文件页数： | 4/44页 |
| 文件大小： | 672K |
| 代理商： | YMU757B-Q |
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YMU757B
-12-
Precaution
When KEY is turned on from the condition that a release rate isn't finished completely again in the
same one channel, a tone may change.
This happens in the case of the continuous sound, even the decline sound which.
A reason happens because envelope of the career side of a source of FM sound and modulator side and
a phase deviate.
The hardware creating the phase of a source of FM sound and envelope starts a movement by the
following two conditions.
- A release rate is finished.
- Key ON occurs.
Tone data start a movement at the timing which modulator, a phase between the career, envelope are
the same as. It is being based on what is done. When this condition isn't satisfied, a change in a tone
occurs.
It explains by the following envelope figure.
It thinks that there is a tone which only release time is different from with the career and modulator as
an example.
As for the condition that it stops completely, it moves to attack rate at the same time with KEY on.
If the last pronunciation is not the condition which stops completely while it is released, the setup of a
release is made early forcibly, and it moves from the condition that (8.94mS) stops to attack rate.
(In the figure, the dotted line of A)
Though envelope of the solid line changes to attack rate soon at the time of second KEY ON, because
sound of the dotted line doesn't stop completely, envelope can't move to attack rate soon.
It moves to attack rate after it becomes the condition that release time is made early and it stops
completely. When both envelope and the start of the phase deviate and a tone varies according to the
deviation of this time. Both envelope and the start of the phase deviate, and a tone changes by the
deviation of this time.
How to avoid this symptom.
Try to pronounce it under the condition that a release stops completely.
TK
TI
A
TK
A tone changes.
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