レイテンシーはミリ秒（ms）で測ります。20 ms未満はほぼ即時、20〜50 msは多くの用途で良好、50〜100 msは遅れを感じやすく、100 msを超えるとゲーム、モニタリング、通話、口の動きとの同期に影響します。
Usually feels immediate for playing, monitoring and competitive use.
Often acceptable for casual gaming, calls and general listening.
Timing starts to feel soft; speech and video may look slightly detached.
Echo, late feedback and obvious lip-sync errors are common.
オーディオレイテンシーの意味
音が入力・処理・伝送・再生される各段階で遅延が加わります。出力遅延は動画やゲームに、往復遅延はマイクや楽器のモニタリングに重要です。
Time from a device or app sending audio until your headphones or speakers reproduce it.
Time from a microphone or instrument entering the system until software receives it.
Input delay plus processing and output delay—the number performers usually feel.
Difference between the visible event and the sound; test it with the audio sync tool.
許容できるレイテンシーは何ms？
用途によって許容値は異なります。音楽再生はバッファを許容できますが、演奏やリアルタイム操作では小さい遅延が必要です。
Aim below 20 ms round trip; many performers prefer roughly 10 ms or less.
Lower is better; below 30–40 ms audio output helps cues feel connected.
Lip sync is usually comfortable when offset stays within roughly 40–60 ms.
Small local device delay is fine, but network delay adds to the conversation gap.
音の遅延が発生する原因
Bluetoothコーデック、バッファ、エフェクト、OSのミキサー、テレビの映像処理、ネットワークなどが積み重なります。
Bluetooth encoding, radio transmission and decoding add buffering.
Larger buffers prevent glitches but increase delay.
Noise removal, spatial audio, EQ, plugins and resampling need time.
TV motion smoothing and video pipelines can move pictures later than sound.
オーディオレイテンシーを減らす方法
一度に一つの要素だけ変更して再測定します。音切れを増やさずに効果のある設定を特定できます。
- Measure a baseline
Run the main audio latency test with the same device, browser and connection you normally use.
- Use a wired path
For recording or rhythm-sensitive work, wired headphones and a direct audio interface are the most reliable shortcut.
- Lower the buffer carefully
Reduce buffer size in the DAW or audio app until delay improves without crackles.
- Disable unnecessary processing
Temporarily turn off spatial audio, enhancement suites, noise suppression and heavy plugins.
- Match the media path
Use game/low-latency mode on earbuds or TVs and avoid routing audio through extra devices.
- Retest and record the result
Compare the new measurement with the baseline instead of judging from memory.
正確に測定する方法
ブラウザ測定は実用的な推定値です。同じ環境で複数回測り、極端な値ではなく中央値を使ってください。
Use at least five attempts and ignore accidental taps or obvious outliers.
Do not switch codec, output device, browser tab or enhancement settings between runs.
Measure the TV, console, earbuds or interface exactly as you normally connect it.
Audio hardware latency and internet latency are different problems.
現在の環境を測定
設定を変更する前に、比較できる基準値を作りましょう。
オーディオレイテンシー FAQ
Is 100 ms audio latency bad?
For passive listening it may be tolerable, but 100 ms is clearly noticeable for gaming, live monitoring, calls and lip sync.
Can Bluetooth audio have zero latency?
No practical Bluetooth path is truly zero-latency. Low-latency modes and newer codecs can reduce delay, but the phone, codec and earbuds all matter.
Why do I hear my voice late in headphones?
You are hearing round-trip latency: microphone input, software processing and headphone output delay combined.
Does a faster internet connection reduce audio latency?
It can reduce network delay in calls or cloud gaming, but it does not fix local Bluetooth, buffer or device-processing latency.
What is the difference between latency and lag?
They are often used interchangeably. Latency is the measurable delay; lag is the user-visible or audible effect of that delay.