Multiplexer Packet Data Alternating Transmission
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Solution Overview
Problem
Conventional image capturing devices using multiplexers with analogue signals cannot simultaneously transmit image signals from multiple cameras, requiring separate exposure times and high-capacity buffers, leading to bulky and expensive devices.
Innovation Solution
An image capturing device with a multiplexer that alternately arranges packet data from multiple cameras, allowing for simultaneous transmission of image signals without the need for large buffers, using a data combining unit to prepare combined data that includes packet data with predetermined idle times and error detection codes to mitigate noise interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If analogue signals are used in a multiplexer to transmit image signals from multiple cameras, then the device structure is simple, but simultaneous transmission of image signals from multiple cameras is not possible and large high-capacity buffers are required
Solution Approach 1:
The patent replaces the conventional analogue signal transmission system with a digital packet-based transmission system. By converting image signals into digital packets and using packet multiplexing, the system achieves simultaneous transmission from multiple cameras without requiring complex analogue signal switching mechanisms or large buffers, thus resolving the contradiction between device simplicity and simultaneous transmission capability.
Solution Approach 2:
The patent changes the signal representation parameter from continuous analogue values to discrete digital packets with specific timing characteristics. By controlling packet transmission timing and using idle periods between packets from different cameras, the system enables simultaneous multi-camera transmission while maintaining multiplexer simplicity, avoiding the need for large buffers.
2Productivity
If packet data is transmitted at high speed to enable simultaneous image capture, then productivity is improved, but noise interference from periodic low frequency noise increases
Solution Approach 1:
The patent employs periodic idle periods between packet transmissions from different cameras. By introducing regular time intervals (idle periods) in the packet transmission sequence, the system synchronizes transmissions to avoid overlapping with periodic low-frequency noise cycles, thereby maintaining high transmission speeds while mitigating noise interference through rhythmic transmission patterns.
Solution Approach 2:
The patent uses brief idle periods to skip over noisy time windows. By strategically placing idle periods between packets from different cameras, the system rushes through data transmission during low-noise intervals and pauses during high-noise periods, enabling high-speed simultaneous transmission while avoiding noise contamination.
Data Source
Figure 1
Figure 2(a)~2(c)
Figure 3(a)~3(b)
AI summary
[Problem] To make a device compact and inexpensive by omitting a frame buffer. [Solution] First packet data PD1 that is sequentially received from a first camera C1 and second packet data PD2 that is sequentially received from a second camera C2 are alternately and sequentially transmitted to an external device 2 before data for one screen is accumulated. Therefore, a frame buffer for saving the data for one screen is not necessary, and a device can be made correspondingly more compact and less expensive.