数字音频是什么？- 概念解释

数字音频,简单定义

数字音频是已转换为计算机可以存储和处理的数字数据的声音。当你数字录制音频时,声波每秒被采样数千次,每个采样被存储为一个数字。

CD音质音频每秒采样44,100次(44.1kHz),并将每个采样存储为16位数字。这创建了可以在任何设备上完全相同地回放的完美准确的声音再现。

模数转换器(ADC)以规则间隔测量声波的振幅(响度),并将每次测量转换为数字。每秒采样次数(采样率)越多,每个数字越大(位深),表示就越准确。

当你播放音频时,数模转换器(DAC)读取这些数字并重建原始声波,然后放大并发送到扬声器或耳机。

44,100 samples per second, 16-bit depth. The standard for music distribution since 1982.

96kHz or 192kHz sample rate, 24-bit depth. Used by audiophiles and professional recording studios.

8kHz sample rate, 8-bit or G.711 compression. Minimum quality for understandable speech.

AAC at 256kbps (Apple Music) or OGG Vorbis at 320kbps (Spotify). Lossy compression of CD-quality source.

现在你已理解这个概念,使用我们的免费工具来转换、压缩和优化你的文件。

常见问题

Sample rate is how many times per second audio is measured. CD uses 44.1kHz (44,100 samples/second). Higher rates capture more detail.

Bit depth determines the dynamic range of audio. 16-bit (CD) gives 96dB range. 24-bit (Hi-Res) gives 144dB range.

For recording and editing, yes. For final listening, the difference is essentially inaudible on consumer audio equipment.

FLAC for lossless archiving. AAC or OGG for compressed listening. WAV for professional production.

Lossless audio (FLAC, ALAC, WAV) stores all the original data perfectly. Lossy audio (MP3, AAC) discards some data to achieve smaller file sizes.