MarinCompass vs 音響測定アプリ

MarinCompassは、iPhoneの磁気センサーによる磁気方位を大きく見やすく表示するシンプルなコンパスアプリです。 端末を船首方向へ正しく固定して使用すると、現在の向きに応じた方位角と方位記号を確認できます。文字盤は滑らかに回転し、縦向き・横向きの画面に対応しています。 主な機能 ・0〜359°の磁気方位表示 ・N、NE、E、SE、S、SW、W、NWの方位表示 ・縦向き・横向き対応 ・方位センサーが利用できない場合の「No signal」表示 ・位置情報の許可状態と方位精度の表示 ・画面表示中のスリープ抑制 ご注意 このアプリはiPhoneの磁気センサーによる方位を表示します。GPSの進行方向（COG）は使用しません。 船体の金属、電源ケーブル、モーター、スピーカー、無線機などの近くでは磁気方位が乱れる場合があります。 本アプリは航海用機器ではなく、航行の安全や方位の正確性を保証するものではありません。

Measure and analyze the acoustic characteristics of your speakers and room using just your iPhone or iPad. The app supports measurements using AirPlay-compatible speakers, Bluetooth A2DP speakers ,your device’s built-in speakers, and externally connected wired speakers. Sync markers track the timing relationship between playback and recording, correcting time drift when necessary. After verifying measurement quality, you can inspect frequency response, impulse response, and more. Use your results to optimize speaker placement and equalizer settings, or compile prompts, charts, and numerical data packs to consult with your preferred AI assistant. ■ Key Features 【1. Acoustic Measurement】 • Measures speaker and room response using Exponential Sine Sweep (ESS) signals. • Assesses measurement quality through sync markers, clock drift verification, and automated clipping and ambient noise checks. • Supports external USB measurement microphones and compatible calibration files. 【2. Frequency Response & Acoustic Graphs】 • Displays frequency response in relative dB, with selectable 1/3, 1/6, and 1/12 octave smoothing. • Visualizes minimum phase characteristics and measured group delay. • View graphs in full screen and inspect specific frequencies and levels with an interactive cursor. 【3. Spectrogram】 • Displays a color heatmap showing how sound decays over time across frequencies. • Switch display time ranges to evaluate acoustic decay trends from low to high frequencies. 【4. Decay Analysis & Multi-Position PEQ】 • Calculates frequency-dependent decay times (T20 / T30). • Identifies common resonance peaks across multiple measurement positions to generate parametric EQ (PEQ) filter recommendations. • Customize target curve slopes, number of recommended bands, and maximum boost limits. 【5. Stereo L/R Speaker Comparison】 • Compares left and right frequency responses and volume levels to evaluate channel balance across frequency bands. • Analyzes the Energy-Time Curve (ETC) to display arrival times and relative levels of early reflections compared to direct sound, helping identify reflective surfaces. • Generates independent PEQ recommendations for each channel and exports comparison results as a shareable graphic. 【6. Measurement Records & Export】 • Saves measurement records, recorded WAV files, and impulse responses locally on your device. • Manage records easily with multi-selection and batch deletion. • Export measurement results and PEQ settings in image, JSON, and CSV formats. 【7. AI Acoustic Consultation Pack】 • Generates tailored prompts based on your acoustic goals, such as "Bass Management," "Placement & Reflections," "L/R Balance," or "PEQ." • Selects and compiles charts and numerical data packs—including frequency response, ETC, minimum phase, group delay, and spectrograms—directly from your measurement records. • Review and edit prompts before sharing. Data packs can be shared together, with redundant files automatically omitted during batch export. • AI responses are suggestions, not direct measurement data. Always re-measure under identical conditions to verify any adjustments. ■ Privacy All measurements, analyses, and consultation packs are processed entirely on-device. The app never automatically transmits measurement data to external AI services. When sharing materials to external services, you review the contents and share them manually via the standard iOS Share Sheet. The microphone is accessed strictly during user-initiated measurements and sound level checks—it never records continuously in the background. ■ Measurement Tips • Frequency response is displayed in relative dB and does not indicate absolute sound pressure level (dB SPL). • Perform measurements in as quiet an environment as possible. • When using AirPlay, ensure that both your device and playback hardware are connected to a stable Wi-Fi network.