噪声频谱仪 vs Live Spectrum Analyzer

噪声频谱仪是一款面向家庭、办公室和设备噪声排查的声学测量工具。 它使用 iPhone 或 iPad 麦克风实时估算 A 计权声级，并提供 60 秒等效连续声级、最高/最低声级、峰值频率、时域波形、FFT 频率成分、时频图、频率密度曲线和频段能量谱。 你可以通过外部声级计输入参考读数进行声级校准，也可以用滑杆调整各图横轴和纵轴范围，观察不同频率成分和相对变化。 未校准时，绝对分贝数仅供粗略参考；频谱形状、峰值频率和相对变化更有价值。本应用不用于执法、验收、职业卫生或其他正式合规检测。

Live Spectrum Analyzer is a real-time audio visualization tool for musicians, students, teachers, sound makers, and anyone who wants to see sound clearly. Use the microphone for live input, or import an audio file from Files to inspect how frequency, amplitude, pitch, and dynamics change over time. Switch between waveform, FFT, sonogram, spectrum bars, VU meter, pitch, octave bands, peak hold, envelope, waterfall, phase, Lissajous, and XY Scope views. Each mode is designed for quick visual reading while you listen, tune, practice, demonstrate acoustics, compare sounds, or check a recording. The app also provides practical analysis readouts, including RMS, peak level, decibels, detected pitch, strongest frequency peaks, spectral centroid, zero crossing rate, dynamic range, estimated BPM, beat strength, mel bands, chroma, noise floor, and clipping status. Results are intended as helpful visual references rather than certified measurement data. Key features: • Live microphone waveform and spectrum visualization • Import audio files for playback and local visual analysis • Waveform, FFT, sonogram, bars, VU, pitch, waterfall, phase, and scope modes • Adjustable gain, time window, FFT floor, sonogram brightness, contrast, and speed • Pitch reference, tolerance, microphone gain, and noise gate settings • Record audio locally, review saved recordings, and share or delete files • Capture visualization snapshots as PNG images • Local-first workflow with no account required Subscription and purchase information: The app offers a free experience and optional Pro access. Actual prices, trials, promotions, and availability are shown in the App Store. Privacy and data information: Your microphone input, imported audio, recordings, snapshots, and analysis results stay on your device by default. The app does not require an account and does not upload your media to a server operated by us. Privacy Policy: https://sites.google.com/view/livespectrumanalyzer/home/privacypolicy Terms of Use: https://sites.google.com/view/livespectrumanalyzer/home/term_of_use Contact: gongchengyong70@gmail.com