CPE Telephone Demodulator for Analog Ring Media
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Solution Overview
Problem
Customer Premises Equipment (CPE) connected to analog RJ-11 twisted pair telephone lines lacks advanced media features compared to cellular or mobile phones, limiting functionality and unable to provide features like graphics, audio, and video notifications for incoming calls.
Innovation Solution
A CPE device with an interface for receiving an alternating voltage analog ring signal, a demodulator to decode low amplitude media data, and an input/output component for audible or visual output, enabling customized ring tones, images, or video display on RJ-11 wiring, while maintaining compliance with traditional Bellcore/Telcordia analog transmission requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If CPE devices are connected to traditional analog RJ-11 twisted pair lines, then compatibility with legacy telephone systems is maintained, but advanced media features such as graphics, audio, and video notifications are unavailable
Solution Approach 1:
The patent embeds a demodulator within the CPE device that can extract and process media data nested within the traditional ring signal structure. The demodulator is integrated into the existing device architecture, allowing legacy analog infrastructure to carry additional digital media information without requiring complete system replacement.
Solution Approach 2:
The invention modifies the ring signal by varying its duty cycle and temporal characteristics to encode media data. By changing parameters of the existing analog signal (duration, timing patterns, amplitude modulation), the system conveys additional information beyond simple call notification, enabling graphics, audio, and video features while maintaining analog compatibility.
2Loss of information
If the ring signal duty cycle is increased to provide media data transmission, then more information can be conveyed, but the ring signal may interfere with legacy telephone devices
Solution Approach 1:
The patent applies different signal characteristics to different time periods within the ring signal structure. During specific intervals (such as the off-hook detection period), the signal maintains traditional characteristics compatible with legacy devices. During other intervals, the signal incorporates media data transmission with modified duty cycles. This localized differentiation allows both legacy compatibility and advanced features to coexist.
Solution Approach 2:
The invention uses periodic variations in the ring signal duty cycle to encode media data while maintaining overall signal recognition. By systematically alternating between different duty cycle patterns in a periodic manner, the system transmits information without creating continuous interference that would disrupt legacy telephone devices. The periodic structure allows receiving devices to distinguish between notification and data transmission phases.
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
Enables CPE devices to provide media features comparable to mobile phones, such as customized ring tones and visual notifications, without interfering with legacy devices, by modulating low amplitude media data onto the ring signal, allowing for uninterrupted data transmission during both ring 'on' and 'off' periods.
Implementation Method 1
low amplitude media data which is modulated on the alternating voltage analog ring signal
Data Source
AI summary
A customer premises equipment (CPE) device, such as a telephone, connected to a local communications line existing on the premises is capable of receiving incoming telephone or like communication calls. The device has an interface which connects the device to the local communications line on the premises and enables the device to receive an alternating voltage analog ring signal corresponding to a notification of an incoming telephone call. The device also includes a demodulator for decoding and processing the ring signal including additional media data which is of low amplitude relative to that of the alternating voltage analog ring signal and which is modulated on the alternating voltage analog ring signal. Further, the device includes an input/output (I/O) component providing a means for audible and/or visual output of media from the device. The media output from the device directly corresponds to the media data modulated on the ring signal. CPE telephone systems and methods are also provided.