音频与麦克风 — 测试与工具

在浏览器中测试你的麦克风——说话并观察实时波形和分贝表，检查峰值电平和本底噪声，还可以录制一小段音频，听听麦克风采集到的真实声音。不会上传任何数据。

Record your voice online — an in-browser dictaphone with pause and resume, a live waveform, and a player and download for every take. Everything stays on your device; nothing is uploaded.

在浏览器中测试你的扬声器、耳机或耳塞。播放左声道、右声道或双声道的音调，在立体声场中来回扫描，几秒钟内就能知道是否有一侧没有声音。

在整个音频频谱范围内测试你的耳机或音箱。通过滑块、预设或全频段扫描播放 20 Hz 到 20 kHz 的纯正弦音，准确找出设备开始衰减、失真或彻底静音的位置。

生成 20 Hz 到 20 kHz 之间的稳定音调。可选择正弦、方波、锯齿或三角波，精确设置 Hz 数值或乐音音名，并可左右平移声像。

Free online metronome from 20 to 260 BPM. Set the tempo with a slider or tap it in, accent the first beat of the bar, and practice to a sample-accurate click with a beat indicator and measure counter.

Test your room acoustics with MATT-style gated tone bursts. Sweep a crisp Ta-Ta-Ta pattern through your speakers and mark the frequencies where the room blurs the bursts into a smear — the classic articulation test, right in the browser.

Play calibrated test tones in the browser. Step a 1 kHz sine through exact THD levels from 0.001% to 5% and find the distortion you can actually hear, or run a perceptual 20 Hz–20 kHz sweep that should sound evenly loud from end to end.

测试你的低音炮、音箱或耳机到底能下潜多深。播放 20 到 200 Hz 的纯正弦音——点击预设、用滑块微调，或扫描整个低音范围，准确记录低频消失的临界点。

Hear quantization, dithering, and noise shaping for yourself. A pulsing tone steps from 0 down to −90 dBFS, requantized live to 4–16 bits — plain, dithered, or noise-shaped — so you can find exactly where each version disappears.

Test your subwoofer with six synthesized kick drums stepping down from 70 to 20 Hz — each should get deeper, never louder — then sweep one channel from 200 to 40 Hz to find the frequency where bass stops being localizable and set your crossover below it.

检测立体声、5.1 或 7.1 系统中的每一个扬声器。点击房间示意图上的某个扬声器，即可单独播放该声道的测试音，也可自动轮播全部声道，并用 30–120 Hz 低音扫描检查低音炮。

直接在浏览器中用麦克风测量音量。实时分贝读数提供估计 dB SPL 或精确 dBFS，附带峰值、平均值和最小值统计，以及常见声音的参考对照表——不会录音，也不会上传任何数据。

Test your hearing range in the browser. A pure tone sweeps down from 22 kHz — tap the moment you hear it to find your upper limit, then a second sweep rises from 10 Hz for your low end, with an age-typical comparison for your result.

在浏览器中测试你的耳机或头戴式耳机——播放左声道、右声道或双声道的音调，扫描立体声场，检查平衡和接线极性，并测验自己能否分清左右耳。

Test your stereo setup in the browser. Check the left and right channels and the phantom center, hear the level, timing, and head-shadow cues your brain uses to place a sound, and take a 10-round quiz on where a knock comes from.

Blind test your hearing with real statistics. Guess whether a mystery music clip is 16-bit or crushed to 8-bit, and whether a hi-hat lands in sync with the kick or milliseconds late — vote round by round and see if your score beats pure guessing.