HDAUDIO及测试平台简介
本文转载于itocp论坛，原文作者Dr.BT，原文地址http://www.itocp.com/viewthread.php?tid=2765&pid=33357&page=1&extra=page=1#pid33357
本文作者在文章一开始就提到了，本次测试的平台超级豪华，虽然是集成的声卡，但其他配置都是发烧级别，虽然有些发烧的硬件与本次测试无关。。。。。虽然集成的CODEC一样，但是在不同的板子上不同的用料以及使用不同的电源等都会对集成声卡造成影响，所以本次测试确实是一次比较罕见的YY的集成声卡测试。
4年前HDAUDIO就诞生了吧，集成声卡开始支持2496，这是非常大的飞跃，同时3D音效也有长足进步，进一步挤压独立声卡，闹得现在独立声卡全给挤到专业和高端领域去了。不是支持2496就能达到2496的好效果的，同样，不是能放cd就能把cd放出色的，所以，HDaudio究竟能到什么层次，这是需要仔细测试的。
|
测试平台： |
|
e6850 3g |
|
team ddr2 800 |
|
msi p35pt ALC888T |
|
inno 8800gts 640 |
|
se200 pci |
|
intel 82559 |
|
三个日立硬盘，一个wd硬盘 |
|
成色很新的nmb460 |
|
测试软件依旧是rmaa 6.06 |
老规矩
wm 8776数据：
* Audio Performance
* 108dB SNR (‘A’ weighted @ 48kHz) DAC
* 102dB SNR (‘A’ weighted @ 48kHz) ADC
* DAC Sampling Frequency: 32kHz – 192kHz
* ADC Sampling Frequency: 32kHz – 96kHz
* Five Stereo ADC Inputs with Analogue Gain Adjust from +24dB
to –21dB in 0.5dB Steps
* Programmable Limiter or Automatic Level Control (ALC)
* Stereo DAC with Independent Analogue and Digital Volume
Controls
* Stereo Headphone and Line Output
* 3-Wire SPI Compatible or 2-Wire Software Serial Control
Interface
* Master or Slave Clocking Mode
* Programmable Audio Data Interface Modes
* I2S, Left, Right Justified or DSP
* 16/20/24/32 bit Word Lengths
* Analogue Bypass Path Feature
* Selectable AUX Input to the Volume Controls
* 2.7V to 5.5V Analogue, 2.7V to 3.6V Digital Supply
Operation
alc888t数据：
High-performance DACs with 97dB SNR (A-Weighting),
ADCs with 90dB SNR (A-Weighting) Ten DAC channels support 16/20/24-bit PCM
format for 7.1 sound playback, plus 2 channels of independent stereo sound
output (multiple streaming) through the front panel output Two stereo ADCs
support 16/20/24-bit PCM format, one for stereo microphone, one for legacy
mixer recording All DACs supports 44.1k/48k/96k/192kHz sample rate All ADCs
support 44.1k/48k/96k sample rate 16/20/24-bit S/PDIF-OUT supports
44.1k/48k/96k/192kHz sample rate 16/20/24-bit S/PDIF-IN supports
44.1k/48k/96k/192kHz sample rate Up to four channels of microphone array
input are supported for AEC/BF applications High-quality analog differential
CD input Supports external PCBEEP input and built-in digital BEEP generator
Software selectable 2.5V/3.75V VREFOUT Two jack detection pins each designed
to detect up to 4 jacks Supports legacy analog mixer architecture Wide range
(–80dB ~ +42dB) volume control with 1.5dB resolution of analog to analog
mixer gain Software selectable boost gain (+10/+20/+30dB) for analog
microphone input All analog jacks are stereo input and output re-tasking for
analog plug & play Built-in headphone amplifiers for each re-tasking jack
Two GPIOs (General Purpose Input and Output) for customized applications
Supports anti-pop mode when analog power AVDD is on and digital power is
off. 64-pin LQFP 'Green' package Meets Microsoft WHQL/WLP 3.0 audio
requirements WaveRT-based audio function driver for Windows Vista EAX™ 1.0 &
2.0 compatible Direct Sound 3D™ compatible A3D™ compatible I3DL2 compatible
HRTF 3D Positional Audio Emulation of 26 sound environments to enhance
gaming experience 10-Band Software Equalizer
官方数据并不支持24/88.2
不过我实际用foobar 可以ssrc到24/88.2，但是rmaa测不到24/88
（这里补充一点关于alc888t的中文介绍：ALC888T音频解码芯片，这款芯片不仅能输出符合HD
Audio标准的8声道音频，还首次融合了Skype IP语音真强技术，可以实时提升IP语音质量而无须额外硬件帮助。）
数据表格对比
还是从废柴16/44开始吧
Summary
| Frequency response (from 40 Hz to 15 kHz), dB |
+0.06, -0.40 |
Good |
| Noise level, dB (A) |
-91.4 |
Very good |
| Dynamic range, dB (A) |
91.2 |
Very good |
| THD, % |
0.0043 |
Very good |
| THD + Noise, dB (A) |
-79.8 |
Average |
| IMD + Noise, % |
0.014 |
Very good |
| Stereo crosstalk, dB |
-90.4 |
Excellent |
| IMD at 10 kHz, % |
0.110 |
Average |
| General performance |
|
Very good |
是不是很糟糕？IMD表现非常弱，就像当初那个解释创新src问题的文章里描述的一样。事实证明，HDAUDIO依旧无法绕过传统的SRC问题，16/44注定是垃圾表现虽然其他指标已经超过了很多声卡的水平。
找个竞争对手，谁呢？就se200的7.1输出吧
Summary
| Frequency response (from 40 Hz to 15 kHz), dB |
+0.02, -0.25 |
Very good |
| Noise level, dB (A) |
-92.0 |
Very good |
| Dynamic range, dB (A) |
92.0 |
Very good |
| THD, % |
0.0016 |
Excellent |
| THD + Noise, dB (A) |
-85.4 |
Good |
| IMD + Noise, % |
0.0074 |
Excellent |
| Stereo crosstalk, dB |
-89.1 |
Excellent |
| IMD at 10 kHz, % |
0.0075 |
Excellent |
| General performance |
|
Excellent |
IMD的差距足以致命
那么，16/48如何呢？se200的16/48和16/44差不多的
不过hdaudio么：
Summary
| Frequency response (from 40 Hz to 15 kHz), dB |
+0.04, -0.21 |
Very good |
| Noise level, dB (A) |
-91.8 |
Very good |
| Dynamic range, dB (A) |
91.7 |
Very good |
| THD, % |
0.0012 |
Excellent |
| THD + Noise, dB (A) |
-84.1 |
Good |
| IMD + Noise, % |
0.0080 |
Excellent |
| Stereo crosstalk, dB |
-90.1 |
Excellent |
| IMD at 10 kHz, % |
0.0075 |
Excellent |
| General performance |
|
Excellent |
注意IMD，已经达到se200 7.1的水平了！其他数据也不弱！不过么，16bit下的测试向来被我无视的。
24/88无法测试，那只能24/96了
先来ALC888：
Summary
| Frequency response (from 40 Hz to 15 kHz), dB |
+0.02, -0.14 |
Very good |
| Noise level, dB (A) |
-93.4 |
Very good |
| Dynamic range, dB (A) |
93.5 |
Very good |
| THD, % |
0.0013 |
Excellent |
| THD + Noise, dB (A) |
-85.2 |
Good |
| IMD + Noise, % |
0.0068 |
Excellent |
| Stereo crosstalk, dB |
-88.2 |
Excellent |
| IMD at 10 kHz, % |
0.0059 |
Excellent |
| General performance |
|
Excellent |
然后是SE200的7.1
Summary
| Frequency response (from 40 Hz to 15 kHz), dB |
+0.02, -0.14 |
Very good |
| Noise level, dB (A) |
-94.0 |
Very good |
| Dynamic range, dB (A) |
93.9 |
Very good |
| THD, % |
0.0014 |
Excellent |
| THD + Noise, dB (A) |
-87.8 |
Good |
| IMD + Noise, % |
0.0058 |
Excellent |
| Stereo crosstalk, dB |
-89.9 |
Excellent |
| IMD at 10 kHz, % |
0.0056 |
Excellent |
| General performance |
|
Excellent |
是不是数据上已经看不出差异了？然后我们开始要比细节
曲线图对比
频响曲线
ALC888：
SE200 7.1
很明显，ALC888对于超过20K的直接阻断，高频方面的浪线也要注意，嘿嘿。面对普通独立声卡（se200的7.1相当于普通独立声卡），alc888的频响曲线有些缺陷，但是比ac97时代好了很多。
信噪比
ALC888
| |
Left |
Right |
| RMS power, dB |
-92.4 |
-92.0 |
| RMS power (A-weighted), dB |
-93.5 |
-93.3 |
| Peak level, dB FS |
-72.9 |
-72.5 |
| DC offset, % |
+0.0 |
-0.0 |
SE200 7.1
低频这块，ALC888差距比较大了
| |
Left |
Right |
| RMS power, dB |
-92.7 |
-92.5 |
| RMS power (A-weighted), dB |
-94.0 |
-94.0 |
| Peak level, dB FS |
-70.1 |
-72.0 |
| DC offset, % |
-0.0 |
-0.0 |
动态范围ALC888
| |
Left |
Right |
| Dynamic range, dB |
+92.2 |
+91.9 |
| Dynamic range (A-weighted), dB |
+93.7 |
+93.4 |
| DC offset, % |
+0.00 |
+0.00 |
SE200 7.1
低频差距依旧大
| |
Left |
Right |
| Dynamic range, dB |
+92.9 |
+92.8 |
| Dynamic range (A-weighted), dB |
+93.9 |
+93.9 |
| DC offset, % |
-0.00 |
-0.00 |
THDALC888
| |
Left |
Right |
| THD, % |
+0.0013 |
+0.0013 |
| THD + Noise, % |
+0.0059 |
+0.0059 |
| THD + Noise (A-weighted), % |
+0.0054 |
+0.0056 |
SE200 7.1
| |
Left |
Right |
| THD, % |
+0.0014 |
+0.0015 |
| THD + Noise, % |
+0.0047 |
+0.0046 |
| THD + Noise (A-weighted), % |
+0.0040 |
+0.0041 |
THD+N两者差距还是有的，而且THD的图上，ALC888好像乱了点
IMD+N
ALC888
| |
Left |
Right |
| IMD + Noise, % |
+0.0067 |
+0.0069 |
| IMD + Noise (A-weighted), % |
+0.0057 |
+0.0058 |
SE200 7.1
| |
Left |
Right |
| IMD + Noise, % |
+0.0058 |
+0.0058 |
| IMD + Noise (A-weighted), % |
+0.0049 |
+0.0049 |
差距是存在滴
Stereo crosstalk
这个上次那个帖子骂7.1太厉害了
ALC888
| |
Left |
Right |
| Crosstalk at 100 Hz, dB |
-81 |
-78 |
| Crosstalk at 1000 Hz, dB |
-86 |
-88 |
| Crosstalk at 10000 Hz, dB |
-79 |
-80 |
SE200 7.1
| |
Left |
Right |
| Crosstalk at 100 Hz, dB |
-85 |
-84 |
| Crosstalk at 1000 Hz, dB |
-88 |
-89 |
| Crosstalk at 10000 Hz, dB |
-72 |
-70 |
注意，低频方面的立体声分离度，SE200 7.1赢了不少，10K以后SE200
7.1大幅拉高，不敌ALC888，这点么，只能说ONKYO这时候太不负责任了。而ALC888则在20K以后突然下降，这是因为截止了，嘿嘿。总的来说，立体声分离度大家都不是好鸟，声场都很难保证好。
IMD (swept tones)
ALC888
| |
Left |
Right |
| IMD + Noise at 5000 Hz, |
0.0058 |
0.0059 |
| IMD + Noise at 10000 Hz, |
0.0058 |
0.0059 |
| IMD + Noise at 15000 Hz, |
0.0059 |
0.0062 |
SE200 7.1
| |
Left |
Right |
| IMD + Noise at 5000 Hz, |
0.0056 |
0.0057 |
| IMD + Noise at 10000 Hz, |
0.0057 |
0.0055 |
| IMD + Noise at 15000 Hz, |
0.0057 |
0.0054 |
ALC888依旧在20K以后截止......双方半斤八两，都不怎么样。
最后分数评价
测试完毕，面对普通独立声卡，ALC888的表现非常出色了，要求不高的话已经可以小小的享受下音乐。不过必须注意，一定要SSRC，否则么，和ac97一样垃圾。
播放推荐：直接用WMP11播放音乐，因为WMP11自动会SSRC到2496，声音好很多，或者用foobar，千千等，SSRC后播放，不会SSRC？
上个图
再来一张，这下还不会么，我没办法了
如果se200的7.1可以打60分，那alc888实际可以有45分左右了。音乐可以听听，电影可以看看，不过别指望什么声场，立体声分离度太弱，好多声卡不知道有没有30分哦。
推荐：买个1k5以上的主板，800以上的电源，基本可以让集成声卡能听了。不过，这样做么，直接上独立算了。 |
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