I2S Audio Packet Clocking for Asynchronous Signal Regeneration
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Solution Overview
Problem
Existing high-speed serial communication protocols, such as FPD-LINK, do not effectively handle asynchronous audio signals with different frequency bands and sampling clock frequencies, leading to challenges in accurate signal regeneration.
Innovation Solution
A communication apparatus and system that utilize a counting section to generate packets with specific information about the number of reference clocks, bit width, and frequency ratios, along with a physical layer clock generator and packet generator to synchronize and regenerate audio signals correctly using I2S standards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If audio signals conforming to the I2S protocol are transmitted between two SerDeses, then audio transmission is enabled, but the signals are asynchronous and have different frequency bands making correct regeneration difficult
Solution Approach 1:
The patent applies preliminary action by counting the number of reference clocks in one cycle of the divided audio master clock signal before transmission. This count value is included in the transmitted data, allowing the receiving end to regenerate the audio master clock signal with the correct frequency relationship without requiring asynchronous synchronization mechanisms.
Solution Approach 2:
The patent uses the reference clock count value as an intermediary parameter to bridge the frequency difference between transmitting and receiving ends. This count information acts as a mediator that enables the receiving SerDes to reconstruct the original audio master clock frequency relationship, solving the asynchrony problem without requiring complex synchronization protocols.
2Adaptability or versatility
If the frequency of the sampling clock is made different depending on sound sources, then adaptability to different audio applications is improved, but the complexity of maintaining correct frequency relationships increases
Solution Approach 1:
The patent applies parameter changes by allowing the sampling clock frequency to vary depending on the sound source requirements while maintaining correct frequency relationships through the reference clock count mechanism. The count value dynamically adjusts to reflect the actual frequency relationship, enabling flexible sampling rates without increasing system complexity.
3Speed
If high-speed serial communication is performed between SerDeses, then transmission speed is improved, but handling of asynchronous audio signals with different frequency bands becomes problematic
Solution Approach 1:
The patent applies preliminary action by pre-calculating and transmitting the reference clock count value that defines the frequency relationship. This allows high-speed transmission of audio packets without real-time frequency negotiation, maintaining both high speed and adaptability to different audio signal characteristics.
Data Source
AI summary
Communication apparatus with correct audio signal regeneration are disclosed. In one example, a communication apparatus includes a counter that counts the number of a predetermined reference clock included in one cycle of a divided signal of an audio master clock with a frequency that is equal to a product of a frequency of a sampling clock for sampling of an audio signal and a multiplier on the basis of the audio master clock, a ratio of division of the divided signal and the predetermined reference clock. A packet generator generates a packet including the counted number counted, a bit width of SD (Serial Data) conforming to an I2S standard, the frequency of the sampling clock, the ratio of division of the divided signal to the audio master clock, a frequency ratio of the frequency of the audio master clock to the frequency of the sampling clock, and the SD.