Audio Mixing Device Using Single Down-Sample Filter
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Solution Overview
Problem
Conventional audio codecs require two down sample filters to process analog and digital audio signals from different sources, increasing costs and limiting the ability to mix these signals simultaneously.
Innovation Solution
An audio mixing device and method that includes an ADC, a converting module to adjust the data rate of digital signals, and a mixing module to aggregate and down-sample signals, using only one down sample filter to process both analog and digital audio signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If two down sample filters are used to process analog and digital audio signals from different sources, then each signal can be processed independently, but the circuit cost increases
Solution Approach 1:
The patent combines the processing paths of analog and digital audio signals by using a single down sample filter. The analog signal is converted to digital format first, then both the converted analog signal and the original digital signal are mixed together and processed by one shared down sample filter, eliminating the need for two separate filters and reducing circuit cost
Solution Approach 2:
The patent introduces an analog-to-digital converter as an intermediary component that converts the analog audio signal to digital format before mixing. This intermediary enables both signals to be in the same format (digital) so they can be combined and processed by a single down sample filter, resolving the contradiction between processing capability and circuit complexity
2Device complexity
If a selecting module is used to choose between analog and digital audio signals, then only one down sample filter is needed, but the ability to mix both signals simultaneously is lost
Solution Approach 1:
The analog-to-digital converter serves as an intermediary that enables the analog signal to be converted to digital format, allowing it to be mixed with the digital audio signal. This conversion removes the need for a selecting module while enabling simultaneous mixing of both signal sources through a single down sample filter
Solution Approach 2:
The patent changes the format parameter of the analog audio signal by converting it to digital format through the ADC. This parameter change enables the analog signal to be compatible with the digital signal, allowing both to be processed by the same down sample filter and mixed simultaneously without requiring a selecting module
Data Source
AI summary
An audio mixing device and method are provided. The audio mixing device includes an analog to digital converter (ADC), a converting module, a mixing module, and a down-sample filter. The ADC is adapted to receive an analog signal, and convert the analog signal into a first digital signal. The converting module receives the second digital signal, and adjusts a data rate of the second digital signal according to a data rate of the first digital signal to generate a third digital signal. The mixing module mixes the first digital signal and the third digital signal to output a mixed signal. The down-sample filters down-samples the mixed to output a down-sampled signal.