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參數(shù)資料
| 型號： | LM4560VJD |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 消費家電 |
| 英文描述： | Advanced PCI Audio Accelerator |
| 中文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP100 |
| 封裝： | PLASTIC, TQFP-100 |
| 文件頁數(shù)： | 32/54頁 |
| 文件大小： | 380K |
| 代理商： | LM4560VJD |
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4.0 Functional Description
(Continued)
4.1 WAVE ENGINE
Feature:
64 voice synthesis
Each voice channel typically consumes 0.25% PCI band-
width
8/16 bits, mono/stereo, unsigned/signed samples at arbi-
trary sample rate
Unlimited length of wave samples
Internal 26 bits computation, DAC driven up to 20 bits
Double buffering envelope curve
Pitch shifting
0–6 Hz low frequency oscillator
FM/AM modulation
Chorus, Reverb effect
Recording/Playback full-duplex
Main Mixer capture
Microphone channel capture
I
2
S interface
S/PDIF interface
Modem data rate conversion
4.1.1 Scheduler
Wave engine process SRC (Sample Rate Conversion), EM (Envelope Modulation), FM (Frequency Modulation), AM (Amplitude
Modulation) and DM (Digital Mixing) channel by channel. A central controller called Scheduler will decide the processing se-
quence of up to 64 playback channels (including up to 10 special channels) and 1 legacy playback/recording channel.
To optimize PCI bus utilization, Scheduler decides each channel’s priority according to the following rules:
Legacy playback/recording channel always has the high-
est priority.
Channels which require PCI bus cycle, i.e. cache miss
channels, have higher priority.
DS100910-4
FIGURE 3. Testing Specification Standard
www.national.com
32
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