术语解释

AIFF (Audio Interchange File Format)

这是一种数字音频的未压缩无损格式。使用AIFF文件可从导入的歌曲刻录高质量音频CD。AIFF文件每分钟使用大约10MB的磁盘空间。

ALAC (Apple Lossless Audio Codec)

这是由Apple Inc.开发的无损音频压缩方法的编解码器。此编解码器可在iTunes、iPod或iPhone上播放。压缩为约60~70%的数据可解压缩为完全相同的原始数据。

DSD (Direct-Stream Digital)

这是音频数据录制方法之一,是用于将音频信号存储在超级音频CD上的信号示象,也是Δ-Σ调制数字音频。

FLAC

FLAC 代表免费无损音频编解码器,是一种免费的无损音频文件格式。无损意味着音频是压缩的但无任何质量损失。
FLAC许可证如下所示。

Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 Josh Coalson

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.

Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.

Neither the name of the Xiph.org Foundation nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS “AS IS” AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

MP3 (MPEG Audio Layer-3)

这是国际标准化的音频数据压缩方案,采用“MPEG-1”视频压缩标准。该技术可将数据压缩到原大小的十一分之一左右,同时还能保持相当于音乐CD的音质。

WMA (Windows Media Audio)

是由微软公司开发的音频压缩技术。

WMA数据可采用Windows Media® Player软件进行编码。

若要编码WMA文件,只能使用由微软公司授权的应用程序。如果使用未经授权的应用程序,则文件可能无法正常运行。

采样频率

采样是指以规则的间隔采集声波 (模拟信号) 读数,并以数字化的格式表达声波的波幅 (产生数字信号)。

1秒钟内采集读数的次数称为“采样频率”。该值越大,则重新生成的声音越接近原声。

动态范围

动态范围是指声音不会失真的最高电平和超出设备所发出噪音的可辨别声音的最低电平之间的电平差。

比特率

表示光碟上录制的每秒可读取的音频量。

结束处理

该过程可使刻录机录制的DVD/CD能被其他播放器播放。

线性PCM

这是非压缩PCM(Pulse Code Modulation)信号。不同于MP3等有损压缩音频源,不会影响任何音频质量和动态范围。

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