Audio Transmission Synchronization via Counter and Parity Feedback
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Solution Overview
Problem
Existing digital audio transmission systems lack a mechanism for synchronized encryption key management, particularly in scenarios with data loss or pause-resume operations, leading to inaccurate decoding due to unsynchronized key changes between transmission and reception sides.
Innovation Solution
A transmission apparatus that adds a counter value and parity value to audio data units for every predetermined number, ensuring these values are in a predetermined state based on a preset rule, allowing synchronized processing between the transmission and reception sides, including options for muting or encryption state indication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If encryption key changes over time without synchronization mechanism, then copyright protection is improved, but decoding accuracy deteriorates due to unsynchronized key changes between transmission and reception sides
Solution Approach 1:
The patent implements feedback by transmitting counter values and parity values from the transmission side to the reception side. The reception side uses these feedback values to synchronize its key changes with the transmission side, ensuring both sides use the same encryption keys at corresponding time points while maintaining accurate decoding
Solution Approach 2:
The patent applies preliminary action by pre-transmitting counter values and parity values along with audio data units before actual decryption occurs. This allows the reception side to prepare the correct decryption keys in advance, ensuring synchronized key changes and accurate decoding without waiting for subsequent synchronization signals
2Reliability
If counter values are changed for every block without pause-resume capability, then encryption synchronization is improved, but adaptability to data loss and pausing deteriorates
Solution Approach 1:
The patent implements dynamics by making the counter value transmission adaptive rather than fixed. The system dynamically adjusts counter value transmission based on operational state: during normal operation, counters increment continuously; during pauses, counter increment is suspended; after resumption, the reception side can detect the pause state through parity value changes and resynchronize accordingly, maintaining both synchronization and adaptability
3Ease of operation
If no predetermined information is transmitted with counter values, then data transmission simplicity is improved, but ability to perform synchronized special processing deteriorates
Solution Approach 1:
The patent applies universality by designing the counter value and parity value transmission mechanism to serve multiple functions simultaneously: it provides encryption key synchronization, enables detection of data loss and pause states, and facilitates synchronized special processing such as muting. This multi-functional approach maintains transmission simplicity while enabling diverse synchronized operations through the same information channel
Data Source
AI summary
To allow special processing while processing is synchronized between a transmission side and a reception side.Each audio data unit of audio data is sequentially transmitted to a reception side via a predetermined transfer channel. A counter value and a parity value associated with the counter value are, for every predetermined number of audio data units, added to the audio data. Predetermined information is transmitted to the reception side with the counter value and the parity value being in a predetermined state based on a preset rule.