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)： 60/68頁
文件大小： 381K
代理商： KD16901
COMMAND SET
AUDIO EFFECT PROCESSOR
4-60
Notification for microcontroller programming
Fade-in/ Fade-out:
To avoid noise due to abrupt change of signal, hardware configuration or filter coefficients, the fade-out and fade-in
processes in the KD16901 happen in following situations.
Change sound mode
Change equalizer mode
Change hardware configuration related to “Digital data format and Input configuration”.
Change “Source selection in Karaoke mode I”
“Vocal Canceller” is turned on or off
“Loudness Function” is turned on or off
“Mixing Function” is turned on or off
“Bypass On-chip Function” is turned on or off
“Output channel selection” is turned into reversion from normal, or vise versa.
The time for finishing fade-out and fade-in processes needs about 0.9 ms for sound mode change and about 0.4
ms for other cases.
Note that the KD16901 denies process of any function received from microcontroller during
fade-out or fade-in process.
Sound Mode Selection:
When one of Karaoke modes is selected, “Bypass On-chip Function” or “Mixing Function” is automatically
turned off if one of them is turned on and “Source selection in Karaoke I” is set to normal. Thus, the
microcontroller should change the status of “Mixing Function”, “Bypass On-chip Function” and “Source
selection in Karaoke I” at this time. Note that “Source selection in Karaoke I” can be inverted only in Karaoke
mode I.
Equalizer Mode Selection:
Equalizer modes and loudness function are exclusive, and thus, equalizer mode cannot be selected while
loudness function is working. To select equalizer mode, the loudness function should be turned off first.
Equalizer Tone Control:
Due to the bug of the KD16901, careful programming is needed to control tone value of the sixth filter in seven
band equalizer mode. In the seven band graphic equalizer mode, the tone value of the seventh band is first
saved before changing the tone value of the sixth band. For example, if the desired tone value of the sixth
band is 0x12 (0dB scale), then give the command for tone control of the seventh band with this parameter.
Then, give the command for tone control of the sixth band again. At this time, the parameter can be arbitrary
since it is ignored. Finally, the saved tone value of the seventh band is recovered. This problem is not involved
in 3-band and 5-band equalizer modes. Even in 7-band equalizer mode, this problem is restricted in the tone
control of the sixth band, and also restricted in evaluation samples.
Vocal Canceller:
Movie modes do not work with this function. In KD16901, this function is ignored in one of Movie modes. Thus,
if the sound mode is one of Movie modes, the microcontroller dose not make this function to be selected.
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