FreqCheck™
VIRTUAL PATENT MARKING: The IND CORE™ audio analysis engine and continuous Signal Scoring algorithms utilized in FreqCheck™ represent the foundational acoustic architecture protected under U.S. Patent No. 12,659,418, further supported by continuation application 19/660,467, and proprietary source code registered under 37 CFR 202.20. This page satisfies the virtual patent marking provisions of 35 U.S.C. § 287.
1. White Paper: IND CORE™ Architectural Methodology & Processing Constraints
The FreqCheck™ telemetry engine replaces legacy network-dependent hardware benches by executing real-time, zero-drift Fast Fourier Transform (FFT) spectral decomposition directly on mobile Apple silicon. Utilizing Hanning-windowed signal segmentation, the engine eliminates spectral leakage across discrete frequency bins while applying dynamic root-mean-square amplitude normalization.
Input & File Processing Specifications: For live instrumentation monitoring, physical line-in inputs operate at a maximum ceiling of 48 kHz to preserve strict NIST standard compliance. For post-process media auditing, the engine ingests professional uncompressed and lossless audio/video formats—specifically supporting .wav, .flac, .alac, .aiff, .m4a, and .mp3 files up to audiophile resolutions of 24-bit / 384 kHz. To protect against processor thermal throttling and data skew, imported files are governed by strict duration thresholds: a maximum of 2 minutes (120 seconds) for video and 3 minutes (180 seconds) for audio. Within these boundaries, the engine processes the entire file end-to-end without segment truncation, utilizing Apple's AVAssetReader to dynamically standardize sample rates to 44.1 kHz for absolute mathematical consistency.
Zero-drift edge processing delivers mathematical purity without interpolation.2. Standard Operating Procedure (SOP): Professional Ingestion & Field Metrology
To maintain 100% lab-grade compliance and generate forensically admissible evidence during field deployment, operators must adhere to the following protocol:
- Live Hardware Configuration: When analyzing live signals below 20 Hz using external analog data acquisition modules (such as professional ROGA DAQ systems via direct DC-coupled line-in routing), operators must explicitly toggle and activate the "Line In" external setting within the FreqCheck app menu. This disables default mobile audio filters and enforces the required 48 kHz maximum input ceiling for NIST traceability. (Note: This menu activation is bypassed and unnecessary when importing pre-recorded media files).
- Media File Ingestion & Compliance: When conducting post-process analysis, select supported uncompressed or lossless formats (.wav, .flac, .alac, .aiff, .m4a, .mp3). Ensure files comply with operational time limits—strictly capped at 2:00 minutes for video and 3:00 minutes for audio—to prevent processor memory saturation. The engine evaluates the entire file from start to finish.
- Signal Integrity Validation: Observe the real-time Signal Score indicator (1.0–5.0) to verify spectral purity, signal-to-noise ratio, and harmonic stability prior to audit commitment.
- Forensic Sealing & Cryptographic Export: Execute report generation to automatically lock telemetry to the unique hardware signature of the deploying device via SHA-256 cryptographic hashing, producing a digitally signed, tamper-evident PDF audit report.
3. ISO/IEC 17025:2017 Calibration Certificate
FreqCheck integrates NIST-traceable standards directly into a mobile deployment architecture. This completely bypasses the need for external laboratory processing and expensive equipment rentals. You receive immediate, certified validation of any audio source in real time. (Accreditation Range: 4.0Hz to 100.0Hz).
You command the highest standard of global metrology directly from your device.
4. IND CORE™ Full Spectrum Sweep: 1Hz to 100Hz
The IND CORE™ engine tracks and processes continuous tonal sweeps from 1Hz to 100Hz. It operates independently of standard mobile audio roll-off constraints. You seamlessly capture the absolute physical truth of a signal across the entire infrasonic and audible baseline.
Every measurement reflects the precise physical reality of the spectrum.Unedited screen capture of the IND CORE™ engine tracking a 1Hz-100Hz reference signal.
5. IND CORE™ Engine Technical Audit Case Study
The engine actively reconciles discrete spectral signatures across the deepest infrasonic and high-frequency bands, automatically eliminating background noise and spectral leakage. Additionally, the IND CORE™ engine's Algorithmic Signal Integrity Scoring calculates a real-time Signal Score (1.0-5.0) utilizing proprietary temporal and spectral evaluation algorithms protected under our patent portfolio. This continuously audits the structural purity and stability of the target frequency against ambient noise. You receive an immediate, mathematically validated metric of signal integrity rather than relying on uncalibrated visual approximations, giving you undeniable, exportable forensic evidence.
Your acoustic analysis is backed by indisputable, mathematical proof.
UNCERTAINTY DISCLOSURE: NIST-Traceable Systematic Quantization Limit ±0.67 Hz. Reported values reflect Fixed FFT Bin Centers (Bin Width 1.35 Hz @ 44.1kHz).
Verified Frequencies: 1Hz, 5Hz, 10Hz, 15Hz... 99.59Hz (Dominant: Gamma Band)
6. Metrological Traceability & Hardware Bridging
The FreqCheck™ DSP engine operates as a character-verified instrument tested via direct electrical injection against ISO/IEC 17025 standards from 0.5 Hz to 100 Hz. This guarantees the software's mathematical accuracy. To prevent standard hardware-induced signal attenuation in the deep infrasonic range (below 20Hz), the platform natively integrates with external DC-Coupled Audio Interfaces (e.g., ROGA DAQ line-ins) or class-compliant digital USB measurement interfaces. You ensure absolute validity by pairing certified software with your own calibrated sensors and interconnects.
You maintain complete authority over your fully verified measurement chain.7. Documented Systematic Digital Offsets
We openly document the systematic digital offsets created by our fixed bin width of 1.3458Hz in the high-frequency band (30-100Hz). This proves the engine operates at its maximum theoretical resolution without applying artificial smoothing or interpolated guessing. You can place absolute trust in the raw, unvarnished data exactly as the physics dictate.
Total algorithmic transparency guarantees the absolute integrity of your results.| Input (Hz) | Bin | Center (Hz) | Reported (Hz) | Offset |
|---|---|---|---|---|
| 33.00 | 25 | 33.64 | 34 | +1Hz |
| 40.00 | 30 | 40.37 | 40 | 0 |
| 45.00 | 33 | 44.41 | 44 | -1Hz |
| 60.00 | 45 | 60.56 | 61 | +1Hz |
| 80.00 | 59 | 79.40 | 79 | -1Hz |
| 86.00 | 64 | 86.13 | 86 | 0 |
| 95.00 | 71 | 95.55 | 96 | +1Hz |
| 100.00 | 74 | 99.59 | 100 | 0 |
Conclusion: These variances are systematic and non-random, confirming the engine operates at maximum theoretical resolution without artificial interpolation.
8. Hardware-Anchored Spectral Verification
Every FreqCheck™ Audit Report is protected by a proprietary three-layer integrity architecture: Device-Hash anchoring, SHA-256 cryptographic sealing, and internal digital PDF signing. This creates an immutable checksum across every data point that instantly invalidates if a single character is altered post-generation. You generate forensic-grade, hardware-bound records that cannot be falsified, backdated, or manipulated without immediate detection.
Your exported documentation stands impenetrable against any level of scrutiny.9. The Zero-Knowledge Privacy Architecture
For enterprise, aerospace, and defense applications, data security is not a feature—it is a prerequisite. FreqCheck is engineered on a zero-knowledge edge computing framework that guarantees absolute signal privacy. One hundred percent of the IND CORE™ signal processing occurs locally on the user's device. FreqCheck does not record, store, transmit, or upload any raw audio or video data to any external server, under any circumstances. The acoustic environment of the user remains permanently and exclusively on their hardware.
The only data that interacts with the cloud infrastructure is mathematical metadata: the resulting frequency values, amplitude readings, and cryptographic checksums of the generated audit reports. The raw acoustic fingerprint of the user's environment never leaves their device.
Full compliance with corporate espionage protocols and enterprise data governance requirements.FreqCheck™ (the "Software") and its underlying IND CORE™ computational engine operate as an ISO/IEC 17025:2017 calibrated and NIST-traceable measurement instrument. The Software provides a certified baseline for signal analysis. However, absolute end-to-end NIST traceability requires an unbroken, verified chain of calibrated equipment from the physical signal source to the digital measurement engine.
Furthermore, while the built-in iOS device microphone is highly capable for general analysis, it is a mass-market consumer sensor lacking individual calibration; therefore, measurements relying solely on the internal microphone do not constitute a complete NIST-traceable chain.
The end user is solely and exclusively responsible for the certification, calibration, and signal integrity of any external hardware used to capture, convert, and route the signal to the iOS device. This includes, but is not limited to, external microphones, hydrophones, DC-coupled audio interfaces, analog-to-digital converters, cables, and third-party sensors.
Abundance Sea, LLC makes no warranties and assumes no liability regarding the accuracy, compliance, or calibration status of user-supplied hardware. To maintain a fully compliant, legally defensible NIST-traceable chain for evidentiary, academic, regulatory, or FCC submissions, the user must independently certify and maintain their entire hardware signal path.