MTA Signal Level Compensation for Induced Attenuation
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Solution Overview
Problem
Existing telephony devices struggle to maintain optimal signal levels for call progress signals and network signals due to varying attenuation across different network operators' equipment, leading to inconsistent levels of dial tone, busy signals, and other features like caller ID, which are not adequately compensated by simple volume adjustments.
Innovation Solution
A system that retrieves attenuation values from the MTA device's configuration file to adjust the output of the tone/modem signal generator, ensuring call progress and FSK signals are balanced with network signals by compensating for the induced attenuation in the line interface, thereby maintaining optimal signal levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If attenuation is induced at the MTA user device to optimize network signal levels, then voice signals from the network are improved, but call progress signals generated at the MTA become unbalanced (too loud or soft)
Solution Approach 1:
The patent changes the parameter of signal generation level based on the attenuation value. The tone/modem signal generator adjusts its output level dynamically according to the attenuation value retrieved from the configuration file, ensuring that call progress signals are generated at the correct level to compensate for the induced attenuation in the line interface.
2Ease of operation
If volume level on the telephone is adjusted to provide desirable dial tone signal level, then call progress signals become acceptable, but actual voice signal received from caller becomes too soft or too loud
Solution Approach 1:
The patent performs preliminary action by adjusting the signal generation level at the source (MTA) before the signal reaches the telephone. The attenuation value is retrieved and used to pre-compensate the call progress signals, so that when they pass through the line interface attenuation, they arrive at the telephone at the correct level, eliminating the need for post-adjustment via volume control.
3Reliability
If induced attenuation is increased to optimize network signal performance, then voice signal quality is improved, but features like caller ID and dial-up modem signaling may not operate properly
Solution Approach 1:
The patent changes the parameter of signal generation level adaptively based on the attenuation value. By retrieving the actual attenuation value from the configuration file and using it to adjust the tone/modem signal generator output, the system ensures that features like caller ID and dial-up modem signaling operate correctly regardless of the attenuation level used for optimizing network signal performance.
Data Source
AI summary
An induced loss value is retrieved from a configuration file of an MTA device. The loss value is provided to a signal generator that generates call progress/alerting signals and FSK signals in the MTA telephony device. To mitigate the imbalance between incoming voice signal levels and call progress/alerting signals that may occur because the call progress/alerting signals are not generated at a level equal to that of the incoming voice signals, the loss/attenuation amount from the configuration file is used to adjust the levels of the generated call progress/alerting and FSK signals by a corresponding amount before they are attenuated along with the incoming voice signals.