标签: 声卡方案

  1.   General Description  The ALC269 is a High Definition Audio Codec that  integrates a 2+2-channel DAC, a 4-channel ADC,  and a Class-D Speaker Amplifier.  The 2+2-channel DAC supports two independent stereo sound outputs simultaneously. The 4-channel  ADC integrates two stereo and independent analog sound inputs (multiple streaming).  The ALC269 incorporates Realtek converter te chnology to achieve a 98dB dynamic range playback  quality and a 98dB dynamic range recording quality.  It meets the current WLP3.10 (Windows Logo  Program) and future WLP requirements.  The ALC269 also supports stereo  digital microphone channels (microphone array) with Acoustic Echo  Cancellation (AEC), Beam Forming (BF), and Noise Suppression (NS) technology simultaneously,  significantly improving voice quality  for PC VoIP applications.  As well as basic audio functions, the ALC269 has two independent S/ PDIF outputs; one could be used to  connect a PC to high-quality consumer electronic pr oducts such as digital decoders and speakers, the  other could provide a dedicated digital output to a HDMI transmitter (common in high end PCs).  There are three integrated power amplifiers. The first is a linear headphone amplifier at port C. The  second headphone amplifier at port  A removes the need for external DC blocking capacitors, eliminating  pop noise caused by these capacitors. The third is an integrated stereo Class-D  amplifier to directly drive  a mini-speaker. The Class-D amplifier is designed to drive speakers with as low as 4  impedance. Its  maximum output power is 2.3W per channel at 5V power supply. The adva ntage of an integrated Class-D  amplifier in the ALC269 is high efficiency with low power consumption.  The ALC269 integrates five hardware equalizer bands composed of one low-pass filter, one high-pass  filter, and three band-pass filters to  compensate for mini-speaker fre quency response. All the equalizer  filters are programmable via the BIOS, allowing the equalizer to function without the need to customize  the audio driver.  The ALC269 conforms to Intel’s Audio Codec lo w power state white paper and is ECR compliant.