Audible Range Voice Encryption Scrambler Bypassing Network Filters
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Solution Overview
Problem
Modern communication channels employ filters that eliminate waveforms outside the human hearing range to conserve bandwidth, causing encrypted voice signals to be altered or eliminated, necessitating a method to form voice encrypted signals within the audible range to bypass these filters.
Innovation Solution
A hardware module with a scrambler that encrypts and encodes voice signals to be within the human audible range, using a combination of modem, codec, crypto, and error correction modules to maintain audio fidelity and security, allowing the signal to be transmitted through packet switched networks without significant alteration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If encrypted voice signals are transmitted directly over communication channels, then security is maintained, but the signals are dramatically altered or eliminated by digital filters
Solution Approach 1:
The patent transforms the frequency parameters of encrypted voice signals to fall within the human audible range (20-20,000 Hz). By changing the frequency domain parameters of the signal, the encrypted content passes through digital filters that selectively eliminate frequencies outside the hearing range, thereby maintaining signal integrity while preserving security through encryption.
2Loss of energy
If communication channels use aggressive filtering to eliminate non-human speech waveforms, then bandwidth is conserved, but encrypted content is dramatically altered or eliminated
Solution Approach 1:
The patent introduces an intermediary transformation process that converts encrypted voice signals into a form that mimics human speech characteristics. This intermediary step involves modulating the encrypted data to occupy the audible frequency range, allowing it to pass through filters designed to preserve voice-like waveforms while blocking other patterns, thus delivering encrypted content reliably without wasting bandwidth.
3Reliability
If voice signals are encrypted before transmission, then security is improved, but the encrypted signals fall outside the hearing range and are filtered out
Solution Approach 1:
The patent applies preliminary action by transforming the frequency characteristics of encrypted signals before transmission. The encryption process is combined with a frequency transformation step that shifts the spectral content into the audible range, so that when signals encounter digital filters during transmission, they are preserved rather than eliminated, maintaining both security and signal integrity.
Data Source
AI summary
A hardware module has a plug to interface with an audio channel of a speech communication device. A scrambler connected to the plug is configured to receive a local audio input signal and form an encrypted audio output signal in a human audible range that is applied to the audio channel of the speech communication device. The scrambler also receives a remote encrypted audio input signal in a human audible range and forms a remote audio output signal corresponding to the remote encrypted audio input signal.