DTMF Signal Amplification in Packet Networks
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Solution Overview
Problem
DTMF signals are attenuated to levels below operational standards when traversing packet networks and network devices, causing issues with communication between conventional telephones and remotely accessed telecommunications systems, such as voicemail systems, due to higher attenuation across multiple packet networks.
Innovation Solution
End-point adapters are used to determine the power level of analog DTMF signals converted from data packets and amplify them if below a threshold, as specified in the TIA-470.230-C standard, to ensure proper communication with remotely accessed telecommunications systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If DTMF signals are transmitted through multiple packet networks and network devices, then network coverage and connectivity are improved, but signal attenuation increases causing DTMF signals to fall below operational standards
Solution Approach 1:
The patent introduces an intermediary device (DTMF amplifier or endpoint adapter) that acts as a mediator between the attenuated DTMF signal and the remotely accessed telecommunications system. This intermediary detects the attenuated signal, amplifies it to the required power level, and forwards it to the destination system, thereby resolving the contradiction between maintaining network connectivity and preventing signal loss.
2Adaptability or versatility
If packet networks are made smaller with more network-to-network interfaces, then network scalability is improved, but signal attenuation increases due to more interfaces
Solution Approach 1:
The DTMF amplifier serves as an intermediary that compensates for the cumulative attenuation introduced by multiple network-to-network interfaces. By detecting the signal power level and applying appropriate amplification, the intermediary ensures that DTMF signals maintain sufficient power levels despite traversing multiple small packet networks with numerous interfaces.
3Adaptability or versatility
If digital-to-analog conversion is performed at endpoint devices, then signal compatibility is improved, but additional attenuation is introduced
Solution Approach 1:
The patent positions the DTMF amplifier as an intermediary device that operates at the endpoint where digital-to-analog conversion occurs. The amplifier detects the converted analog DTMF signal, measures its power level, and applies necessary amplification to compensate for the attenuation introduced by the conversion process, ensuring the signal meets operational standards for remotely accessed telecommunications systems.
Solution Approach 2:
The endpoint device performing digital-to-analog conversion also performs self-service by incorporating the DTMF amplifier functionality. The device automatically detects when DTMF signals require amplification and applies the necessary gain, eliminating the need for external intervention and ensuring continuous operation despite conversion-induced attenuation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The amplification of DTMF signals at end-point adapters ensures that users can effectively interact with remotely accessed telecommunications systems by maintaining signal power above operational standards, even in scenarios with high attenuation across packet networks.
Implementation Method 1
a digital to analog converter 624 in communication with the processing unit 618 and configured to generate the analog DTMF tone signals 628 based on the data in the data packets 612
Implementation Method 2
a DTMF amplifier 630 in communication with the processing unit 618 and the digital to analog converter 624, where the processing unit 618 causes the DTMF amplifier 630 to amplify the power of the analog DTMF tone signals 628
Data Source
AI summary
A network interface device may include an I/O unit configured to receive data packets from a packet network. A processing unit may be in communication with the I/O unit and be configured to identify data packets including data representative of DTMF signals, convert the data in the data packets into analog DTMF tone signals, and determine if power of the analog DTMF tone signals is below a threshold value. A digital to analog converter may be in communication with the processing unit and be configured to generate the analog DTMF tone signals based on the data in the data packets. A DTMF amplifier may be in communication with the processing unit and the digital to analog converter, where the processing unit may cause the DTMF amplifier to amplify the power of the analog DTMF tone signals in response to determining that the power of the analog DTMF tone signals are below the threshold value.