Dial Tone Detection via Volume Threshold Analysis
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Solution Overview
Problem
Automated equipment often fails to accurately detect non-standard dial tones on a telephone line, leading to failed initiation of outgoing calls even when the line is available, as it relies solely on frequency analysis and cannot recognize valid tones with different characteristics.
Innovation Solution
A method that involves taking samples of incoming audio on a telephone line, determining their volumes, and identifying a dial tone by determining if a threshold number of samples exceed a threshold volume, allowing for the detection of both standard and non-standard dial tones based on volume analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If automated equipment relies solely on frequency analysis to detect dial tones, then it can detect standard dial tones, but it fails to accurately detect non-standard dial tones
Solution Approach 1:
The patent changes the detection parameter from frequency analysis to volume analysis. Instead of measuring the frequency characteristics of the dial tone, the system measures the volume level of audio samples on the telephone line. This parameter change allows the system to detect both standard and nonstandard dial tones regardless of their frequency characteristics, thereby improving adaptability while maintaining detection accuracy through threshold-based volume comparison
Solution Approach 2:
The patent makes the dial tone detection system universal by enabling it to detect both standard and nonstandard dial tones using a single volume-based detection mechanism. The system does not require different detection methods for different dial tone types, making it adaptable to various telephone exchanges and line conditions while maintaining a unified detection approach
2Adaptability or versatility
If automated equipment uses volume-based detection, then it can detect both standard and nonstandard dial tones, but it requires analyzing multiple samples with threshold comparisons
Solution Approach 1:
The patent applies partial action by taking multiple audio samples and comparing them against a threshold, where only a threshold number of samples need to exceed the threshold volume to confirm dial tone presence. This approach balances the need for accurate detection with simplified processing, avoiding the complexity of analyzing every single sample in detail while still maintaining reliable detection through repeated measurements
Data Source
AI summary
A method to detect dial tone on a telephone line may include taking samples of incoming audio on a telephone line. The method may also include determining volumes of the samples. The method may further include determining whether the volumes of a threshold number of the samples are at or above a threshold volume. The method may also include, in response to determining that the volumes of a threshold number of the samples are at or above a threshold volume, determining that the incoming audio on the telephone line includes a dial tone.