FreqCheck™

At its core, FreqCheck™ (v4.0.5) operates as a fully calibrated, laboratory-certified metrology engine. Powered by proprietary IND CORE™ technology, the software delivers an ISO/IEC 17025:2017-calibrated, NIST-traceable measurement platform across Apple devices—executing dynamic 65,536-point FFT spectral decomposition, deterministic time-domain weighting, and certified RMS amplitude integration entirely on edge hardware.

IEC 61672 Class 1 Sound Level Meter Engine: Independently bench-tested and validated against certified Type 308 laboratory standards in technical collaboration with ROGA Instruments (Germany). FreqCheck tracks certified reference meters within 0.1 dB to 0.2 dB across the audible spectrum (well inside the ±0.5 dB Class 1 tolerance corridor). The engine applies direct mathematical execution of standard IEC A-weighting (dBA), C-weighting (dBC), and flat Linear (Lin-Z) curves paired with true 125 ms (Fast), 1000 ms (Slow), and Impulse exponential RMS time integration.

In Standard Mode: Deploys calibrated internal microphone profiles optimized for low-frequency sweeps, municipal noise ordinances, OSHA workplace noise screening, and continuous environmental monitoring—enabling engineers and compliance officers to generate tamper-evident PDF evidence instantly without external hardware.

In Pro Input Mode (PIM): Consumer OS audio layers step aside completely. Automatic Gain Control (AGC), digital filters, and noise gates are bypassed. Raw, linear voltage from connected UAC-2 DAQs and transducer signal conditioners feeds directly into the mathematical pipeline with user-assigned ADC reference ceilings (10V / 16.6V), discrete channel selection, and custom sensor sensitivities (mV/Pa, mV/g, or mV/m·s²).

In Wideband Metrology Mode (WB): Unlocks wideband acoustic and ultrasonic capture (0.2 Hz – 192 kHz) at hardware clock rates up to 384 kHz. WB mode resolves high-SPL shockwaves without slew-rate distortion while providing continuous high-frequency spectral monitoring for ultrasonic bearing diagnostics, pressurized gas leaks, and high-voltage switchgear corona discharge.

With the Dynamic Pulse Sequence (DPS): The engine automates ballistic peak-hold event counting, logs microsecond rise times, calculates A-duration thresholds, and generates sealed MIL-STD-1474E impulse noise audit sheets directly on the firing line.

YOU COMMAND AN ACCREDITED CLASS 1 METROLOGY LABORATORY DIRECTLY ON YOUR APPLE DEVICE.

THE FOUR-LAYER FORENSIC INTEGRITY ARCHITECTURE

When FreqCheck™ captures a measurement, it doesn't just record data — it produces a legally defensible, forensically tamper-evident, cryptographically sealed measurement artifact.

That means the result you export is built to hold up under exactly the kind of scrutiny it's likely to face: academic peer review, regulatory proceedings, engineering liability cases, defense qualification audits, and courts of law.

Your evidence doesn't just describe what happened. It proves it.

This is made possible by the Four-Layer Integrity Architecture:

Layer 1 — Metrology Configuration Snapshot
When a capture is executed in Pro Input Mode (PIM) or Wideband DPS, FreqCheck records an unalterable hardware metadata manifest stamped directly into the telemetry header prior to hashing. This configuration block archives the complete physical and mathematical state of the test: active hardware clock rate (up to 384.0 kHz), ADC reference ceiling (10V / 16.6V), transducer sensitivity coefficients (mV/Pa, mV/g, mV/m·s²), discrete channel assignment (Ch 1 / Ch 2), selected IEC 61672 frequency weighting (dBA, dBC, or Linear Lin-Z), ballistic time weighting (Fast 125 ms, Slow 1000 ms, or Impulse), DPS trigger thresholds, and NIST-traceable factory calibration reference (Cert #05122C9A 2602; 0.20 dB bench uncertainty). Every environmental offset and gain factor is documented as rigorously as the acoustic waveform itself, leaving zero ambiguity for defense auditors, peer reviewers, or legal cross-examination.

Your setup configuration is now as legally defensible as your captured telemetry.

Layer 2 — Device-Hash Anchoring
The measurement report permanently records the unique hardware signature of the specific iOS device that performed the measurement. That means the instrument and the data are cryptographically married — a report can't be quietly reassigned to a different device after the fact.

Layer 3 — SHA-256 Cryptographic Sealing
At the precise moment of report generation, every data point — every frequency value, amplitude measurement, timestamp, and configuration parameter — is mathematically sealed using SHA-256 cryptographic hashing, anchored to the specific device and session telemetry. That means the data cannot be altered without breaking the seal, and the break itself becomes visible evidence.

Layer 4 — Digitally Signed PDF Export & LIMS Integration
The final exported report is a professionally formatted, cryptographically signed PDF document. That means if any value, graph, timestamp, or configuration parameter is altered by even a single digit after generation, the forensic checksum immediately reveals the tampering. Traditional acoustic workflows end in exposed CSV files — FreqCheck replaces this vulnerability with an immutable forensic record, making every report a fully qualified, ready-to-deploy edge component for any enterprise Laboratory Information Management System (LIMS).

This is how FreqCheck™ turns a smartphone into a forensic instrument — the data it produces isn't just accurate, it's provably, demonstrably, cryptographically accurate.

Your data is provably, demonstrably, and cryptographically bulletproof.

ENTERPRISE & INDUSTRIAL APPLICATIONS

Because FreqCheck™ measures continuously across an expansive bandwidth from 0.2 Hz infrasonic baselines through 192 kHz wideband and ultrasonic spectra, its core applications span multiple heavy industries — the same certified engine, applied wherever acoustic and vibrational truth matters.

Execute accredited impulse noise and blast wave characterization for firearm suppressors, ordnance testing, and defense acquisition qualification. Powered by the Dynamic Pulse Sequence (DPS), FreqCheck automates peak-hold event counting and A-duration thresholds. Handshaking natively at up to 384 kHz sample rates with 10V and 16.6V analog front-ends, the engine eliminates slew-rate limitation to capture microsecond rise times and transient overpressures past 175 dB RMS without clipping. Sealed PDF telemetry protocol outputs natively satisfy MIL-STD-1474E, ASTM, ISO 10843, and ANSI S12.19 requirements directly on the firing line.

Microsecond transient overpressures are captured with uncompromising linearity and complete field mobility.

Perform continuous wideband spectral monitoring to identify early mechanical degradation, turbulent compressed gas leaks, and high-voltage electrical partial discharge across the ultrasonic spectrum. By operating at full 192 kHz acoustic bandwidth (384 kHz clock) without analog roll-off, FreqCheck reveals high-frequency bearing friction, steam trap failures, and electrical switchgear corona ionization long before heat or audible noise appears.

PREDICTIVE ULTRASONIC SURVEILLANCE STOPS MACHINERY BREAKDOWN WEEKS BEFORE DOWNTIME OCCURS.

Measure the natural resonant frequencies of critical infrastructure and industrial machinery to detect shifts in vibrational signatures. That means developing problems in a bridge, a support structure, or a piece of heavy machinery can surface as a measurable frequency shift long before they surface as a failure.

Rapid, field-deployable health monitoring replaces waiting for something to visibly break.

Pair with certified hydrophones or DC-coupled seismic sensors to identify low-frequency acoustic events, tectonic shifts, and subsurface anomalies down to the 0.2 Hz range. That means signals normally reserved for fixed seismic stations become observable from a mobile, field-deployed device.

The deep, slow signals of the earth become as measurable as anything audible.

Analyze baseband signals from demodulated Part 90 radios via Pro Input Mode's DC-coupled inputs, down to 0.2 Hz, with the sample rate locked to match your radio equipment's exact output. This generates cryptographically sealed reports built specifically for frequency coordination evidence, with the receiving hardware's configuration documented directly on the report itself. That means the documentation submitted for licensing coordination carries the same tamper-evident integrity as every other FreqCheck report.

Regulatory evidence and day-to-day field measurement now come from the exact same certified source.

APPLE BUSINESS MANAGER & ENTERPRISE DEPLOYMENT

While standard App Store tiers serve independent contractors and field verification, FreqCheck Enterprise (v4.0.5) ($499.99 lifetime per seat) is purpose-built for defense contractors, military testing proving grounds, industrial laboratories, and corporate engineering teams requiring formal accreditation compliance.

Certified Commercial & Manufacturer Rights: Enterprise licensing unlocks full commercial certification authority—authorizing organizations to utilize FreqCheck data for legal packaging claims, official suppressor decibel ratings under MIL-STD-1474E, and formal Class 1 acoustic validation reports submitted to regulatory agencies.

Centralized MDM License Ownership: Corporate organizations retain permanent ownership of every license asset. Deployed via Jamf, Microsoft Intune, or Apple Configurator across iPhone, iPad, Mac, and Apple Vision Pro, IT administrators seamlessly provision, revoke, and reassign seats as testing personnel and field teams rotate.

Frictionless Corporate Procurement: Eliminate credit card limits and public App Store billing constraints. FreqCheck Enterprise integrates directly into corporate procurement workflows with Vendor Onboarding, Master Services Agreements (MSAs), formal Purchase Orders (POs), and Net-30 invoicing through Apple Volume Purchasing.

Air-Gapped Defense Builds & Custom LIMS Pipelines: Binaries are distributed privately to your Apple Business Manager Organization ID—bypassing the public App Store for air-gapped, zero-telemetry defense ranges, SCIF facilities, and cleanrooms. For organizations operating under mutual NDA, Abundance Sea, LLC provisions custom algorithms with structured, SHA‑256 validated JSON outputs designed to integrate natively into proprietary Laboratory Information Management Systems (LIMS).

A PERMANENT CORPORATE METROLOGY ASSET DEPLOYED VIA APPLE BUSINESS MANAGER.