CT Scanner Voice Communication Filtering for Gantry Rotation Noise
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Solution Overview
Problem
Existing communication apparatuses in CT scanners struggle to effectively reduce noise interference during the rotation of the gantry, making it difficult for operators to hear the subject's voice clearly due to varying noise frequencies caused by changing rotational speeds.
Innovation Solution
A communication apparatus with a filter section that determines the noise frequency based on the rotational speed of the gantry and sets appropriate filter characteristics to remove the noise components from the sound received by the microphone, ensuring the subject's voice is clearly audible to the operator.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a fixed filter characteristic is used to remove noise, then noise removal is effective for a specific rotational speed, but noise cannot be fully reduced when rotational speed varies
Solution Approach 1:
The filter characteristic is made dynamic by automatically adjusting it according to the detected rotational speed of the rotating section. The system transitions from a fixed filter to an adaptive filter that changes its parameters in real-time based on the operating conditions, ensuring effective noise removal across all rotational speeds.
Solution Approach 2:
The invention changes the parameters of the filter characteristic based on the rotational speed. By detecting the rotational speed and selecting or adjusting the filter parameters accordingly, the system optimizes noise removal effectiveness for each specific operating condition while maintaining adaptability to speed variations.
2Productivity
If the rotating section rotates at high speed, then scanning efficiency is improved, but noise frequency increases making voice harder to hear
Solution Approach 1:
The invention converts the harmful effect of high-speed rotation noise into a beneficial solution by using the detected rotational speed information to automatically adjust the filter characteristics. The noise that increases with speed is precisely what the adaptive filter is designed to remove, turning the speed-related noise problem into an opportunity for optimized noise removal.
Solution Approach 2:
The system implements feedback by detecting the rotational speed and using this information to adjust the filter characteristic. The rotational speed detection provides feedback about the current operating condition, which is then used to optimize the noise removal process, ensuring that voice clarity is maintained regardless of the scanning speed.
Data Source
AI summary
[Problem] To provide a communication apparatus that makes a subject's voice more audible.[Means for Solution]A communication apparatus 60 has: a microphone 61 for receiving, during rotation of a rotating section 26, sound containing a voice of a subject 5 to be examined and noise caused by the rotation of the rotating section 26; a DSP 623 for executing filter processing for reducing said noise contained in the sound received by the microphone 61, wherein the DSP 623 determines a frequency of the noise caused by the rotation of the rotating section 26 based on a rotational speed vi of the rotating section 26, and sets a filter characteristic F(ti) for the DSP so that a frequency component of the noise contained in the sound is removed; and a speaker 63 for outputting the sound which contains the voice of the subject 5 and from which the frequency component of said noise has been removed.