Audio Processing Device Frequency Offset Calculation
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Solution Overview
Problem
Current audio processing systems face challenges in accurately reconstructing the sampling frequency of digital audio data during transmission, leading to increased waiting time before playback and higher design costs due to hardware circuit compensation.
Innovation Solution
An audio processing device and method that utilize a data processor, clock generator, and buffer memory to calculate and generate accurate audio sampling frequency using audio clock frequency information from input packets, reducing the need for hardware-based frequency correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If hardware circuit is used to compensate and correct the audio sampling frequency, then the audio sampling frequency accuracy is improved, but the design cost is increased
Solution Approach 1:
The patent replaces hardware-based frequency compensation circuits with a software-based solution implemented in the data processor. The data processor calculates frequency offset values and generates correction signals through algorithmic processing rather than physical circuitry, thereby maintaining frequency accuracy while reducing design complexity and cost.
Solution Approach 2:
The patent introduces an intermediary calculated value that represents the frequency offset between the received audio clock frequency and the target sampling frequency. This calculated value serves as a mediator that enables frequency correction through software computation rather than direct hardware intervention, simplifying the overall system design.
2Measurement precision
If waiting time is increased to obtain accurate audio sampling frequency, then the frequency reconstruction accuracy is improved, but the playback delay is increased
Solution Approach 1:
The patent performs preliminary calculation of the frequency offset value using the received audio clock frequency information and target sampling frequency. By pre-calculating the correction value before playback begins, the system eliminates the need for extended waiting periods while ensuring accurate frequency reconstruction from the start of playback.
Solution Approach 2:
The patent skips the traditional lengthy frequency calibration process by directly computing the frequency offset using the relationship between the received clock frequency and target sampling frequency. This approach rushes through the frequency acquisition process in a single calculation step rather than requiring gradual convergence over time.
Data Source
AI summary
An audio processing method includes the following operations. A calculated value is obtained according to multiple audio clock frequency information contained in multiple audio input packets. An audio sampling frequency is generated according to the calculated value and a link symbol clock signal. Multiple audio output packets corresponding to the audio input packets are generated according to the audio sampling frequency.