參數(shù)資料
型號(hào)： LC78621E
廠商： Sanyo Electric Co.,Ltd.
英文描述： Compact Disc Player DSP(用于CD播放器的8位DSP)
中文描述： 光碟機(jī)的DSP（用于光盤播放器的8位數(shù)字信號(hào)處理器）
文件頁(yè)數(shù)： 23/34頁(yè)
文件大?。?/td> 417K
代理商： LC78621E
Attenuation setup
Since the attenuation level is set to the muted state (a muting of –
∞
is specified by an attenuation coefficient of
00H) after the attenuation level is reset, the attenuation coefficient must be directly set to EEH (using the ATT
DATA SET command) to output audio signals. Note that the attenuation level can be set to one of 239 values from
00H to EEH. These two-byte commands differ from the two-byte commands used for track counting in that it is
only necessary to set RWC once and a two-byte command reset is not required. (See the item on two-byte
commands (RWC set once) on page 10.)
After inputting the target attenuation level as a value in the range 00H to EEH, sending an attenuator step up/down
command will cause the attenuation level to approach the target value in steps of 4, 8, or 16 units as specified in
synchronization with rising edges on the LRSY input. However, the ATT DATA SET command sets the target
value directly. If a new data value is input during the transition, the value begins to approach the new target value
at that point. Note that the UP/DOWN distinction is significant here.
Audio output level = 20 log
[dB]
For example, the formula below calculates the time required for the attenuation level to increase from 00H to EEH
when a 4STEP UP command is executed. Note that the control microprocessor must provide enough of a time
margin for this operation to complete before issuing the next attenuation level set command.
238 level
×
4STEP UP
44.1 kHz (LRSY)
≈
21.6 ms
Note: Setting the attenuation level to values of EFH or higher is disallowed to prevent overflows in one-bit D/A
converter calculations from causing noise.
Mute output; Pin 46: MUTEL, pin 55: MUTER
These pins output a high level when the attenuator coefficient is set to 00H and the data in each channel has been
zero for a certain period. If data input occurs once again, these pins go low immediately.
ATT DATA
100H
No. 5223-23/34
LC78621E
相關(guān)PDF資料
PDF描述
LC78622E Compact Disc Player DSP(用于CD播放器的8位DSP)
LC78622NE Compact Disc Player DSP(用于CD播放器的8位DSP)
LC78624E Compact Disc Player DSP(用于CD播放器的8位DSP)
LC78625E SigmaDSP 28-/56-Bit Audio Processor with Two ADCs and Four DACs
LC78625 SigmaDSP 28-/56-Bit Audio Processor with Two ADCs and Four DACs
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LC78622E 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:Compact Disc Player DSP
LC78622NE 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:Compact Disc Player DSP
LC78624E 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:Compact Disc Player DSP
LC78625 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:Compact Disc Player DSP
LC78625E 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:Compact Disc Player DSP
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