Camera Accessory Authentication via Broadcast Presence Signals
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Solution Overview
Problem
In camera systems with interchangeable lenses and adapters, the current communication methods, such as I2C bus, require time-consuming authentication processes when multiple accessory apparatuses are connected, leading to delayed imaging startup due to the need to authenticate all possible addresses, including those with no connected devices.
Innovation Solution
A communication control method that uses a signal transmission channel for broadcast communication and a data communication channel for individual authentication, allowing the camera to detect standby signals from unauthenticated accessory apparatuses and perform sequential authentication, thereby reducing authentication time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the camera performs authentication communication with all possible addresses (0 to n) to ensure all connected accessory apparatuses are authenticated, then authentication completeness is improved, but authentication time increases significantly
Solution Approach 1:
Accessory apparatuses automatically perform self-identification by outputting their presence indication signals without requiring the camera to actively query each address. The camera simply monitors the signal transmission channel for these voluntary signals, allowing accessory apparatuses to serve themselves in the authentication process.
Solution Approach 2:
Accessory apparatuses prepare and output their presence indication signals before the camera initiates authentication. This preliminary action of self-announcement eliminates the need for the camera to sequentially probe each address, as the information is already available when needed.
2Device complexity
If the camera uses a fixed address assignment method for accessory apparatuses, then communication protocol simplicity is improved, but adaptability to unknown device configurations deteriorates
Solution Approach 1:
Accessory apparatuses automatically output their presence indication signals on the signal transmission channel without requiring the camera to configure or assign addresses. This self-announcement mechanism allows the system to adapt to any number and type of connected devices while keeping the camera's control logic simple.
Solution Approach 2:
The signal transmission channel serves dual purposes: it transmits control signals from the camera to accessory apparatuses and simultaneously carries presence indication signals from accessory apparatuses to the camera. This multi-functionality eliminates the need for separate identification protocols.
3Productivity
If the camera sequentially authenticates each accessory apparatus by detecting presence indication signals, then authentication efficiency is improved, but the requirement for simultaneous signal monitoring increases system complexity
Solution Approach 1:
The presence indication signals from multiple accessory apparatuses are merged onto a single signal transmission channel. The camera monitors this single channel for any activity, and the sequential detection of signals from different apparatuses occurs naturally through the shared medium, eliminating the need for separate monitoring circuits for each device.
Data Source
AI summary
A camera includes a lens-camera communication controller and an adapter-camera communication controller. The camera-lens communication channel includes a first data communication channel used during a data communication and a first notification channel used for a notification of a timing of a communication via the first data communication channel. The camera-adapter communication channel includes a second data communication channel used during the data communication and a second notification channel used for a notification of a timing of a communication via the second data communication channel.