Channel
Channel (Audio Signal Path)
A single, independent stream of audio data within a recording. Mono audio has one channel, stereo has two (left and right), and surround sound configurations like 5.1 have six channels.
技術的詳細
Each audio channel stores a separate waveform of PCM samples. Standard channel configurations include mono (1), stereo (2), 5.1 surround (6: front L/R/C, surround L/R, LFE subwoofer), and 7.1 (8 channels). In interleaved PCM, samples alternate between channels (L, R, L, R...); in planar format, each channel is stored as a contiguous block. The Web Audio API's AudioBuffer has separate Float32Array data per channel accessible via getChannelData(). Channel mixing (stereo to mono, upmixing, downmixing) requires combining or splitting channel data with appropriate gain coefficients.
例
``` Audio channel configurations: Mono (1.0) — 1 channel — podcasts, phone calls Stereo (2.0) — 2 channels — music, web audio Surround (5.1) — 6 channels — cinema, gaming Atmos (7.1.4) — 12 channels — immersive audio File size impact: stereo = 2× mono at same bitrate Podcast tip: mono 64 kbps ≈ stereo 128 kbps quality ```