Communication Apparatus Frequency Shift for Broadcast Interference
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Solution Overview
Problem
In vehicles, the interference from stepping motor noise with radio receivers degrades reception quality, and existing solutions like determining whether to spread the motor's control frequency based on the receiver's channel selection are inadequate, especially when the communication rate frequency overlaps with the received channel, causing interference and reduced reception quality.
Innovation Solution
A communication apparatus and system that use Ethernet instead of CAN, allowing fine regulation of communication rates by shifting frequencies commensurate with channel separations, and include a master communication apparatus that changes the communication rate to a different frequency when the difference between the selected broadcast frequency and the communication rate frequency is below a threshold, transmitting change information to the slave apparatus to maintain the new frequency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the communication rate frequency is kept fixed for high-speed data transmission, then productivity is improved, but interference with broadcast reception occurs when the frequency overlaps with the received channel
Solution Approach 1:
The communication apparatus dynamically adjusts the communication rate frequency based on real-time broadcast channel information. The master apparatus receives broadcast frequency information via the receiving interface, compares it with the current communication rate, and switches to an alternative frequency when overlap is detected. This dynamic frequency adjustment resolves the contradiction by allowing high-speed transmission at non-interfering frequencies while maintaining transmission capability.
Solution Approach 2:
The system changes the frequency parameter of the communication rate from a fixed value to a variable value that can be adjusted based on broadcast channel conditions. When the difference between the broadcast frequency and communication rate frequency is below a threshold, the system switches to a different communication rate frequency. This parameter change enables the system to avoid interference while maintaining high-speed data transmission capability.
2Reliability
If the communication rate frequency is changed to avoid interference, then reception quality is improved, but communication stability may be affected due to frequency switching
Solution Approach 1:
The master communication apparatus implements a feedback mechanism where the receiving interface continuously monitors broadcast frequency information and feeds it back to the communication interface. The communication interface compares this feedback information with the current communication rate and automatically adjusts the frequency when interference is detected. This closed-loop feedback system ensures stable and reliable frequency selection by making data-driven decisions rather than arbitrary switches.
Solution Approach 2:
The system performs preliminary frequency checking before initiating or maintaining communication at a specific rate. By receiving and storing broadcast frequency information in advance, the system can predict potential interference scenarios and proactively select appropriate communication frequencies, preventing instability caused by reactive frequency switching during active communication.
3Object-affected harmful factors
If fine regulation of communication rates is implemented by shifting frequencies, then interference suppression is improved, but device complexity increases due to multiple frequency management requirements
Solution Approach 1:
The master communication apparatus integrates multiple functions into a single device: it acts as both a broadcast receiver (with receiving interface) and a communication controller (with communication interface). This multi-functionality eliminates the need for separate frequency management devices, reducing overall system complexity while enabling fine regulation of communication rates through the unified apparatus's ability to access and process broadcast frequency information.
Solution Approach 2:
The communication apparatus performs self-service by automatically monitoring broadcast frequencies, comparing them with communication rates, and adjusting its own operating frequency without external intervention. The master apparatus autonomously makes frequency switching decisions based on the received broadcast information, eliminating the need for complex external frequency management systems or manual configuration.
Data Source
AI summary
A master communication apparatus communicates with a slave communication apparatus. A communication interface communicates with the slave communication apparatus. A receiving interface receives information on a first frequency of a station selected by a receiver of broadcast. When a difference between the first frequency included in the information received by the receiving interface and a second frequency of a communication rate used in communication with the slave communication apparatus is smaller than a threshold value, the communication interface changes the communication rate to a third frequency different from the second frequency. When the communication interface changes the communication rate from the second frequency to the third frequency, the communication interface transmits change information indicating a change to the third frequency to the slave communication apparatus.