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45元的usb声卡
[这个贴子最后由simonchan在 2005/05/10 02:32pm 第 1 次编辑]
这是我找到的ALU100芯片的外文资料,供参考:
Overview
The ALU100 Universal Serial Bus(USB) audio device couples with an AC';97 CODEC to rovide a complete USB based PC digital audio playback and recording solution. The ALU100 is designed primarily for USB digital speaker implementation which enables signals to be taken outside the PC in a digital format right up to the speakers eliminating the possibility for interference introduced by the electronically harsh and noise environment within a computer. Applications other than USB speaker include USB headsets, karaoke, video and telephone/answering devices. The ALU100 eliminates the need for sound card in a PC as its functionality is now handled by the software within the host processor and the USB audio peripheral. Impressive 3D positional sound can be achieved when interfaces with QSound? Q3D. The ALU100 DAC/ADC audio data supports 8/16-bits stereo/mono formats at 44.1KHz and 48.0KHz sampling rates through AC';97 controller interface. The ALU100 integrates USB transceiver and USB engine in an 8-bit micro-controller core. The micro-controller handles the high-level USB protocols, translates the incoming control requests and manages the user interface via HID I/O pins. The ALU100 USB function core fully complies with the USB Specification v.1.1, the USB Device Class Definition for Audio Devices v1.0 and the USB Device Class Definition for Human Interface Devices(HID) v1.0
Key Features
USB Specification v1.1 compliant
USB Audio and HID Device Class v1.0 compliant
12Mbits/s full speed serial data transmission supported
8/16-Bit PCM Digital Data Formats
44.1KHz/48.0 KHz sampling rates
Superior signal-to-noise(SNR) at 95dB
Fully 'lug-and-Play'; operation
Integrated USB Compliant Transceiver(SIE)
Master clock oscillator w/ external 6MHz crystal
4.2V~5.2V operating range including USB power
Efficient power management
AC';97 v1.0/2.0/2.1 compliant interface
Meets MS PC99 USB Audio Requirements
48-Pin QFP & 28-Pin DIP/SOP Packages
Applications
USB speakers
USB headsets
USB Karaoke
USB monitors
USB phones
Software Control Features
Complete USB driver
Windows AP/Utilities (Surround/Equalizer/Karaoke)
Bass/Treble/Mute controls
Voice cancellation & pitch shifting
Auto-sleep timer control
Q3D positional sound interface
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