Heating Cooker Sound Detection Using Cooling-Path Microphone Placement
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Solution Overview
Problem
Conventional heating cookers face issues with microphone malfunction due to high temperatures and soot formation inside the heating chamber, which degrades the quality of sound detection during cooking.
Innovation Solution
A heating cooker design with a sound detector positioned outside the heating chamber and near the blowing path, where cooling wind flows, to prevent heat damage and soot adherence, and a noise removal filter to isolate cooking sounds from fan noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the sound detector is installed inside the heating chamber to directly detect cooking sounds, then the sound detection sensitivity is improved, but the sound detector is exposed to high temperature and soot which causes malfunction and degrades detection quality
Solution Approach 1:
The patent introduces an intermediary mechanism (blowing path with cooling wind) between the heating chamber and sound detector. The cooling wind flows through the blowing path to create a protective barrier that prevents hot air and soot from reaching the sound detector, while still allowing cooking sounds to be transmitted for detection.
Solution Approach 2:
The patent segments the heating chamber from the sound detection zone by introducing a separate blowing path. The sound detector is positioned outside the heating chamber, and the blowing path creates a distinct spatial separation that allows independent optimization of both heating function and sound detection reliability.
2Reliability
If the sound detector is positioned outside the heating chamber to avoid heat damage, then the reliability of sound detection is improved, but the detection sensitivity and sound quality may deteriorate due to distance from the heat source
Solution Approach 1:
The blowing path acts as an intermediary transmission channel that bridges the gap between the heating chamber and the external sound detector. It allows acoustic signals to propagate from the heating chamber to the detector while the cooling wind protects the detector from thermal damage.
3Reliability
If the cooling fan operates at high speed to effectively cool the sound detector, then the protective effect is improved, but the fan noise increases which interferes with cooking sound detection
Solution Approach 1:
The patent dynamically adjusts the cooling fan speed parameter based on operational conditions. The control device varies the fan rotation speed to balance cooling effectiveness with noise generation, reducing fan speed when maximum cooling is not required to minimize noise interference with sound detection.
Solution Approach 2:
The system implements feedback control where the control device monitors both the cooling requirement and the sound detection quality, adjusting the fan speed accordingly to maintain optimal balance between protection and noise reduction.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Ensures reliable sound detection and improved sound quality by protecting the sound detector from heat and soot, while effectively filtering out fan noise to provide clear cooking sound data.
Implementation Method 1
a cooling fan configured to generate the cooling wind
Implementation Method 2
a sound detector configured to detect sounds including a cooking sound of food ingredients being heated in the heating chamber
Implementation Method 3
a heating device configured to heat the inside of the heating chamber
Data Source
AI summary
A heating cooker disclosed herein includes a main body including a heating chamber in which food ingredients are placed, and a blowing path through which cooling wind flows. A heating device heats the inside of the heating chamber. A control device is arranged in the blowing path. The control device controls the heating device. A cooling fan generates cooling wind. A sound detector detects sounds including a cooking sound coming from food ingredients being heated in the heating chamber. The sound detector is arranged outside the heating chamber and near the blowing path.