Interface Circuit Differential In-Phase Signal Transmission
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Solution Overview
Problem
Existing interface circuits for transmitting digital signals, such as audio and video signals, are not suitable for high-quality audio transmission due to limitations in bit rate and potential interference from unnecessary radiation when transmitting at high speeds.
Innovation Solution
The interface circuit employs a combination of differential and in-phase signal transmission methods, using a first transmitting unit to send a differential signal with a clock component and a second transmitting unit to superimpose an in-phase signal with a clock component on the same transmission path, while a state notifying unit communicates connection states using a DC bias potential.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If biphase modulation signal is transmitted at high speed, then transmission speed is improved, but unnecessary radiation is generated affecting other signals
Solution Approach 1:
The patent changes the modulation method from biphase modulation to 8b/10b encoding with differential signaling. This parameter change in the transmission method allows achieving high transmission speeds without generating unnecessary radiation, as the differential signaling and encoding scheme eliminates the radiation issues inherent in biphase modulation at high speeds.
2Device complexity
If biphase modulation signal is used, then simple modulation is achieved, but it is not suitable for high-quality audio transmission
Solution Approach 1:
The patent changes the modulation parameters by adopting 8b/10b encoding combined with differential signaling instead of simple biphase modulation. This provides sufficient bit rate for high-quality audio transmission (including HBR) while maintaining manageable system complexity through standardized encoding schemes.
3Adaptability or versatility
If in-phase signal is transmitted, then bidirectional communication is enabled, but interference with differential signals may occur
Solution Approach 1:
The patent segments the transmission path into dedicated differential signaling paths for high-speed data transmission and uses separate mechanisms (DC bias potential on specific pairs) for bidirectional communication control. This segmentation isolates the in-phase control signals from the high-speed differential data paths, preventing interference while enabling bidirectional communication capability.
Data Source
AI summary
A signal is transmitted at a high speed in a direction opposite to a transmitting direction of a main large-capacity channel. A first transmitting unit transmits a first signal including a clock component to an external device through a transmission path as a differential signal. A second transmitting unit superimposes a second signal including a clock component on the transmission path as an in-phase signal to transmit to the external device. A state notifying unit communicates with the external device through a pair of differential transmission paths included in the transmission path and notifies the external device of a connection state of its own device by a DC bias potential of at least one of the pair of differential transmission paths.