Audio ADC Multiplexing for Channel Selection and DSP Load Reduction
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Solution Overview
Problem
Existing analog-to-digital converters in sound processing devices face inefficiencies in processing load and circuit integration due to suboptimal design, which complicates the conversion of analog audio signals to digital signals.
Innovation Solution
An analog-to-digital converter design incorporating a toggle detection module, data processing modules, and a multiplexer that processes channel selection and clock signals to determine output data bits based on logic level oscillations, optimizing data output and simplifying circuit integration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional analog-to-digital converter design is used, then the conversion function is provided, but the processing load of digital signal processor increases and circuit integration is complicated
Solution Approach 1:
The patent combines the analog-to-digital conversion function with channel selection functionality into a single integrated circuit. The ADC shares internal resources such as the multiplexer and data processing modules with the channel selection logic, eliminating the need for separate channel selection circuits and reducing overall system complexity while maintaining conversion efficiency
Solution Approach 2:
The ADC is designed to perform multiple functions: it can process audio signals from different microphone channels, perform analog-to-digital conversion, and selectively output data based on channel selection signals. This multi-functionality reduces the number of separate components needed in the sound processing device
2Productivity
If traditional analog-to-digital converter design is used, then the conversion function is provided, but the processing load of digital signal processor increases
Solution Approach 1:
The patent extracts and performs channel selection and data formatting operations within the ADC itself rather than relying on the digital signal processor to handle these tasks. By completing these preprocessing operations in the analog-to-digital converter, the amount of work required by the digital signal processor is significantly reduced
3Productivity
If dynamic data output control is implemented, then data output efficiency is improved, but control complexity increases
Solution Approach 1:
The ADC automatically detects the logic level of the clock signal and self-adjusts its data output timing without requiring external control logic. The toggle detection module monitors the clock signal internally and autonomously determines when to output data bits, eliminating the need for complex external control circuitry while achieving efficient dynamic data output
Data Source
AI summary
The invention provides an analog-to-digital converter. In one embodiment, the analog-to-digital converter receives a first audio signal from a microphone sensor, and receives a first channel selection signal and a clock signal, and comprises a toggle detection module, a first data processing module, a second data processing module, and a multiplexer. The toggle detection module detects whether the first channel selection signal is toggling between a logic low level and a logic high level to generate a control signal. The first data processing module processes the first channel selection signal to generate a second channel selection signal. The second data processing module converts the first audio signal from analog to digital to generate a second audio signal. If the control signal indicates that the first channel selection signal is toggling between the logic low level and the logic high level, the multiplexer outputs data bits of the second channel selection signal as an output signal of the analog-to-digital converter when the clock signal oscillates to the logic high level, and outputs data bits of the second audio signal as the output signal of the analog-to-digital converter when the clock signal oscillates to the logic low level.