Clock-Recovered Audio Transmission Without a Return Clock Line
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Solution Overview
Problem
Existing audio transmission systems require a clock signal line from the reception side to the transmission side to achieve high-quality audio reproduction, which can be inconvenient and limit flexibility.
Innovation Solution
A transmission apparatus that receives encoded data capable of clock recovery, generates an audio clock based on the recovered carrier clock, and transmits audio data in synchronization with this clock, eliminating the need for a clock signal line and allowing for high-quality audio reproduction without it.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a clock signal line is supplied from the reception side to the transmission side, then high quality audio reproduction is enabled, but the device complexity and installation convenience are worsened
Solution Approach 1:
The patent extracts the clock signal transmission function from the audio data transmission channel. By embedding clock information within the audio data stream itself (through bit timing and synchronization codes), the separate clock signal line is eliminated, resolving the contradiction between audio quality and device complexity
Solution Approach 2:
The patent merges the audio data transmission and clock signal transmission into a single communication channel. The transmission apparatus sends both audio content and timing information through the same digital interface, eliminating the need for separate clock wiring while maintaining synchronization quality
2Reliability
If a clock signal line is supplied from the reception side to the transmission side, then audio synchronization is achieved, but the ease of operation and flexibility are worsened
Solution Approach 1:
The transmission apparatus autonomously extracts and recovers clock timing from the received audio data stream without requiring external clock signal input. The system self-regulates synchronization by detecting bit timing patterns and synchronization codes within the data stream, eliminating the need for manual clock line connections and enhancing installation flexibility
3Adaptability or versatility
If encoded data with clock recovery capability is received and audio clock is generated from carrier clock, then the need for clock signal line is eliminated, but the audio clock generation complexity increases
Solution Approach 1:
The patent replaces the mechanical/electrical clock signal line connection with a digital signal processing approach. Instead of physical clock wiring, the system uses digital clock recovery circuits that extract timing information from the data stream through electronic synchronization techniques, reducing physical complexity while managing digital processing complexity
Data Source
AI summary
This technology is to enable high quality audio reproduction on the reception side without supplying a transmission clock using a clock signal line from the reception side to the transmission side. The transmission apparatus receives encoded data capable of clock recovery from a reception apparatus (external device), generates an audio clock on the basis of a carrier clock recovered from the encoded data, and transmits audio data to the reception apparatus in synchronization with the audio clock. The reception apparatus transmits the encoded data capable of clock recovery to the external device in synchronization with the carrier clock generated on the basis of an self-generating audio clock, receives the audio data from the transmission apparatus (external device), and processes the audio data on the basis of the self-generating audio clock.