Microphone Pick-Up Device with Signal Filter for Frequency Response
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Solution Overview
Problem
Conventional dynamic microphones exhibit inconsistent sensitivity due to large variance in frequency response, often resulting in distortion of high-frequency signals.
Innovation Solution
A microphone pick-up device with an annular cap body, air chamber unit, pick-up unit, and a signal filter coupled to the voice coil, which includes a yoke, magnet, washer, diaphragm, sound regulating cloth and paper, and a noise-filtering circuit with resistors, inductors, and capacitors to stabilize frequency response.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional dynamic microphone structure is used, then the device is simple and easy to manufacture, but the frequency response has large variance resulting in inconsistent sensitivity
Solution Approach 1:
The microphone is divided into functional modules: cap body, pick-up unit, air chamber unit, and signal filter unit. Each module performs a specific function and can be manufactured separately, then assembled together. This modular segmentation allows for optimized design of each component while maintaining overall simplicity.
Solution Approach 2:
A signal filter unit is introduced as an intermediary component between the pick-up unit and the output. This filter unit, containing RC low-pass filters and RL high-pass filters, mediates the frequency response by attenuating unwanted frequencies and compensating for the natural roll-off, thereby achieving consistent sensitivity across the frequency range without fundamentally changing the simple dynamic microphone structure.
2Reliability
If no signal filter is used, then the device complexity is low, but high frequency signals suffer from distortion
Solution Approach 1:
The signal filter unit changes the electrical parameters of the output signal by using RC low-pass filters to attenuate high-frequency noise and RL high-pass filters to compensate for low-frequency roll-off. By adjusting the resistance and capacitance values, the frequency response is optimized to maintain consistent sensitivity without adding complex active circuitry.
Solution Approach 2:
Instead of using complex mechanical acoustic filters or multiple microphone elements, the patent replaces the solution with simple electrical filtering circuits. The RC and RL filters provide the necessary frequency compensation using only passive electrical components, substituting mechanical complexity with electrical simplicity.
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
The device provides a consistent sensitivity across frequency bands, reducing distortion and improving performance by smoothing the frequency response from low to high frequencies.
Implementation Method 1
a pick-up unit for generating an acoustic signal in response to detected sound, the pick-up unit including a voice coil disposed around the washer and the magnet within the yoke
Implementation Method 2
a signal filter disposed between the rear portion of the cap body and the air chamber unit and disposed posteriorly of the sound regulating paper, the signal filter being coupled to the voice coil and being adapted for filtering noise in the acoustic signal
Data Source
AI summary
A microphone pick-up device includes an air chamber unit disposed posteriorly of an annular cap body. A pick-up unit generates an acoustic signal in response to detected sound, and includes a yoke mounted in a front portion of the cap body, a voice coil disposed around a washer and a magnet within the yoke, a diaphragm for covering the yoke and connected to the voice coil, a sound regulating cloth attached to and disposed to surround the cap body, and a sound regulating paper disposed between a rear portion of the cap body and the air chamber unit and covering an air passage unit of the cap body. A signal filter is disposed between the rear portion of the cap body and the air chamber unit, is disposed posteriorly of the sound regulating paper, and is coupled to the voice coil for filtering noise in the acoustic signal.