STEM与日常科技·英语精读30篇（5）
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Audio Bitrate Choices in Remote Collaboration Tools: Sampling Theory in Practice
远程协作工具中的音频码率选择：采样定理的实际应用
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Zoom and Teams default to 48kbps Opus encoding, sufficient for speech intelligibility but insufficient for accurate prosody in multilingual team settings.
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According to Nyquist–Shannon theory, human voice energy peaks below 4kHz, yet emotional cues like stress or hesitation rely on harmonics up to 7kHz—lost at low bitrates.
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Network-constrained users experience increased cognitive load when subtle vocal cues disappear, leading to longer meeting durations and more follow-up messages.
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Adaptive bitrate switching helps, but abrupt transitions between 12kbps and 48kbps create perceptual dissonance—listeners subconsciously question speaker credibility.
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Enterprise IT departments now benchmark tools not just on MOS scores, but on speaker recognition accuracy and turn-taking fluency under variable bandwidth.
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The real-world implication is clear: audio isn’t 'just speech'—it’s a carrier of social coordination signals that sampling choices directly modulate.