Sound Playback Control for Wake-Up Detection by Area Transition
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Solution Overview
Problem
Conventional systems struggle to accurately determine whether a user has woken up when they become undetectable after being detected in a sleep area.
Innovation Solution
A sound playback device equipped with sensors that detect position and movement within specific areas, controlling sound playback based on predefined conditions, including changes in detection areas and time measurements, to adapt sound playback accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a user is detected in a specified area and then becomes undetectable, then the system cannot appropriately determine whether the user has woken up, but adding more detection conditions increases device complexity
Solution Approach 1:
The detection area is segmented into a first area (sleep area) and a second area (wake-up area). The determination part evaluates multiple independent conditions: (1) whether the object was detected in the first area, (2) whether the object is currently detected in the second area, and (3) whether the object is undetected in the first area. This segmentation allows precise wake-up detection without excessive complexity by using simple spatial zones and clear transition criteria.
2Reliability
If the sound playback manner is changed based on multiple detection conditions, then the accuracy of wake-up determination is improved, but the control logic becomes more complex
Solution Approach 1:
The determination part changes the sound playback manner by evaluating parameter combinations: when the object transitions from the first area to the second area, or when the object becomes undetected in the first area after being detected. The sound control part executes different playback patterns (e.g., alarm sound, wake-up sound, or no sound) based on these parameter changes. This approach improves reliability through clear conditional logic while keeping control manageable through discrete parameter evaluations.
3Measurement precision
If the system waits for additional detection results before changing sound playback, then measurement precision is improved, but time loss increases
Solution Approach 1:
The determination part continuously monitors detection results and prepares to change sound playback as soon as sufficient evidence is gathered. When the object is detected in the second area or becomes undetected in the first area, the system immediately evaluates whether wake-up conditions are met and changes sound playback without unnecessary delays. This preliminary monitoring and quick decision-making approach balances measurement precision with minimal time loss.
Data Source
AI summary
A sound playback device includes: a sensor, output of which changes in accordance with a position or movement of an object including a first area and a second area; a detection part configured to detect a position of the object based on output of the sensor; a sound control part configured to control playback of sound; and a determination part configured to determine whether a first condition is satisfied based on detection results. The sound control part changes a sound playback manner when a second condition, including a position of an object detected in the first area being detected in the second area, becomes satisfied, and changes a sound playback manner based on satisfaction of a third condition including a position of an object detected in the first area becoming not detected in the detection area and the first condition being determined not to be satisfied.