Microphone-Speaker Integration Vibration Cancellation
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Solution Overview
Problem
Current integrated microphone-speaker devices suffer from self-feedback issues, known as whistle, due to sound vibrations generated by speakers being amplified back to microphones, leading to distorted sound quality and limiting their use in portable, convenient karaoke applications.
Innovation Solution
The device features two symmetrically arranged speakers with the same specifications, connected to a control unit and a microphone assembly, where the microphone is positioned within 0 to 20mm of the speakers' axis, and the microphone holder is made of a soft material to cancel out vibrations and prevent self-feedback, using a phase offset mechanism to ensure sound waves cancel each other out.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a microphone and speaker are integrated into one unit, then portability and convenience are improved, but self-feedback whistle is generated due to sound vibrations being amplified back to the microphone
Solution Approach 1:
The patent positions the microphone asymmetrically relative to the speakers, specifically within 0-20mm from the symmetry axis of the speakers. This asymmetric positioning ensures that the microphone is located in a region where the vibrations from symmetrically arranged speakers cancel each other out, thereby preventing self-feedback whistle while maintaining integration.
Solution Approach 2:
The patent uses two speakers with identical specifications arranged symmetrically on opposite sides of the main sound chamber. These speakers generate equal and opposite vibrations that cancel each other out at the symmetry axis, creating a vibration-free zone where the microphone is positioned. This counterbalancing approach eliminates the harmful self-feedback effect.
2Object-generated harmful factors
If damping materials are used to eliminate speaker vibrations, then self-feedback is reduced, but sound quality is distorted
Solution Approach 1:
Instead of using damping materials that would absorb and distort sound waves, the patent extracts the harmful vibrations from the system by positioning the microphone in a location where vibrations naturally cancel out. This approach removes the problem at its source without introducing sound-quality-degrading materials.
Solution Approach 2:
The patent introduces an intermediary spatial position (the symmetry axis within 0-20mm from it) as a mediator between the speakers and microphone. This position acts as a natural vibration cancellation zone, allowing the microphone to receive clear sound without direct vibration interference, thus maintaining sound quality while eliminating self-feedback.
3Object-generated harmful factors
If frequency alteration or filtering is used to avoid whistle, then self-feedback is eliminated, but sound quality is seriously distorted
Solution Approach 1:
The patent converts the potentially harmful vibrations from speakers into a beneficial cancellation effect by strategically positioning the microphone at the symmetry axis. The vibrations that would normally cause self-feedback are transformed into a cancellation pattern, creating a natural vibration-free zone that preserves sound quality while eliminating whistle.
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
This design effectively prevents whistle generation by canceling out sound vibrations, maintaining sound quality and enabling a portable, convenient karaoke experience without distortion.
Implementation Method 1
the frequency or phase of the inputted sound is different from the frequency or phase of the outputted sound... the foregoing approaches can seriously distort the sound
Implementation Method 2
vibration generated by the at least two symmetrically arranged speakers is cancelled at the location of the axis or plane of symmetry of the at least two speakers
Implementation Method 3
Damping materials used for eliminating the vibration generated by the loudspeaker are arranged between outer wall of the microphone pickup and the microphone main body
Implementation Method 4
the microphone holder is made of a soft material to cancel out vibrations
Data Source
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AI summary
The present invention discloses an integrated microphone-speaker device, which comprises a control unit, a main sound chamber and a microphone assembly connected to the main sound chamber. At least two symmetrically arranged speakers are provided within the main sound chamber; the microphone assembly comprises a microphone and a microphone holder. The microphone and the speakers are respectively electrically connected with the control unit, and the microphone holder is made of a soft material. The present invention has the following advantageous effects: two or a plurality of speakers have been symmetrically arranged within the sound chamber, accordingly, the sound vibrations generated by the two or plurality of speakers can cancel each other out, such that the vibrations are prevented from being transmitted to the microphone.