Bitrate
比特率（数据速率）
音频或视频流中每秒处理或传输的比特数，直接影响质量和文件大小。更高的比特率意味着更好的质量但更大的文件。
技术细节
音频比特率以kbps（千比特/秒）衡量。CD质量为1,411 kbps（未压缩PCM：44,100 Hz × 16位 × 2通道）。MP3范围：128 kbps（一般）到320 kbps（高质量）。Opus在128 kbps时达到透明质量。CBR（恒定比特率）保持固定速率，VBR（可变比特率）根据内容复杂度分配更多比特。
示例
``` Audio bitrate guide: 32 kbps — AM radio quality (speech only) 128 kbps — FM radio quality (podcast standard) 192 kbps — Good quality (casual music listening) 256 kbps — High quality (AAC sweet spot) 320 kbps — Maximum MP3 quality 1,411 kbps — CD quality (uncompressed 16-bit/44.1kHz stereo) File size: minutes × bitrate ÷ 8 = KB 5 min @ 128 kbps = 5 × 128 ÷ 8 = 80 KB ≈ 4.7 MB ```
相关工具
B
BPM 计算器
频
频率计算器
D
Delay Time Calculator
D
dB Converter
A
Audio File Size Calculator
N
Note Frequency Chart
D
Decibel Reference Guide
L
Latency Calculator
C
Cents Calculator
L
Loudness Standards Guide
E
EQ Frequency Reference
S
Sample Rate Converter
B
Bit Depth Analyzer
C
Chord Reference
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Key & Scale Reference
相关术语
Sample Rate
Codec
Waveform
Normalization
Channel
Clipping
Equalization
Noise Reduction
Fade
Reverb
Compression (Audio)
Bit Depth (Audio)
PCM
Mono
Stereo
FLAC
Spectrogram
Tempo
Pitch
Dynamic Range
Limiter
Delay
Chorus Effect
Noise Gate
De-esser
Sidechain
LUFS
RMS Level
Peak Level
Dithering (Audio)
Stereo Imaging
Mid-Side Processing
Frequency Spectrum
Harmonic Distortion
Nyquist Frequency
Aliasing (Audio)
Psychoacoustics
Crossfade
Audio Codec
Loudness War
Audio Watermark
Spatial Audio
Audio Fingerprint
Bitrate (Video)