Audio Port Digital Data Input via Parallel Resistor
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Solution Overview
Problem
Existing audio devices can only input data in analog audio format through their analog output ports, limiting the ability to acquire digital data without interfering with normal audio operations.
Innovation Solution
A circuit and method that allow digital data to be input on the analog audio output channels of an audio device by modulating the current flow through a resistive element connected in parallel with the load device, using a switch and logic to demodulate the signal, while maintaining normal audio subsystem operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the analog audio output port is used for its intended purpose only, then audio output function is reliable, but data input capability is limited
Solution Approach 1:
The analog audio output port is designed to perform multiple functions: it can output audio signals through the audio subsystem and simultaneously accept digital data inputs through the same physical connection. The circuit allows the port to be universal, serving both audio output and data input purposes without requiring separate dedicated ports.
Solution Approach 2:
A resistive element is introduced as an intermediary component connected to the analog audio output port. This resistive element serves as a mediator that allows digital data to be transmitted through the audio output channel without directly interfering with the audio signal path, enabling data input while maintaining audio output functionality.
2Adaptability or versatility
If digital data is input through the analog output port, then additional data acquisition channels are enabled, but the circuit complexity increases
Solution Approach 1:
The resistive element acts as a simple intermediary that enables digital data input without requiring complex circuitry. By using this passive component in conjunction with the existing audio subsystem, the patent achieves data acquisition capability while minimizing the addition of complex active components or circuits.
Solution Approach 2:
The patent utilizes changes in electrical parameters (current flow through the resistive element) to encode and transmit digital data. By modulating the current flow in response to digital data and detecting these parameter changes, the system enables data input through the audio port without requiring fundamentally new circuit architectures.
3Loss of information
If current flow modulation is used for data input, then digital data can be transmitted through audio channels, but signal demodulation complexity increases
Solution Approach 1:
The circuit incorporates a feedback mechanism where the current flow through the resistive element is monitored and fed back to the audio subsystem. This feedback allows the system to detect the modulated signal representing digital data and convert it back into usable digital information, enabling reliable data recovery from the audio output channel.
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 the input of digital data on the audio output channels without affecting the normal operation of the audio subsystem, allowing for additional data acquisition channels and formats, such as biometric data, without altering the average current flow.
Implementation Method 1
a resistive element connected to the output port in parallel with the load device and receiving a voltage signal representative of a digital data signal, the voltage signal causing current flow through the resistive element that represents the digital data signal
Implementation Method 2
containing means for measuring current flow through the load device
Data Source
AI summary
An apparatus is disclosed for inputting digital data on the output channel(s) of an audio subsystem in an audio device, without interfering with normal operation of the audio subsystem. The described circuit includes a resistive element in parallel with the expected load device, such as a headphone or speaker. The resistive element receives a modulated digital signal from a data source or a switch, and the instantaneous current through the resistive element due to the modulated digital signal is reflected in a current feedback mechanism of the audio subsystem. Demodulation logic retrieves the digital signal from the current measured by the current feedback mechanism. A capacitor is provided to prevent the current in the resistive element from the digital signal from impacting the average DC current that the feedback mechanism uses to evaluate the load device.