High-Impedance Instrument Buffering for Clean A/D Signal Conversion
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Solution Overview
Problem
Analog signals from electric musical instruments face impedance mismatch issues when directly connected to A/D converters, leading to noise and signal deformation due to high impedance differences.
Innovation Solution
An impedance conversion device with a splitter and impedance conversion circuit that converts high-impedance analog signals to lower impedance signals, allowing for effective signal processing and amplification while maintaining sound quality through the use of a signal processing apparatus with FIR filters to correct frequency characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an electric musical instrument is directly connected to an A/D converter, then the signal can be converted to digital format, but noise and signal deformation occur due to impedance mismatch
Solution Approach 1:
The patent introduces an impedance conversion device as an intermediary component between the electric musical instrument and the A/D converter. This device includes a high-input-impedance buffer circuit that acts as a mediator, converting the high-impedance analog signal from the instrument into a low-impedance signal suitable for the A/D converter, thereby eliminating noise and signal deformation caused by direct connection
Solution Approach 2:
The patent changes the impedance parameter of the signal through the impedance conversion device. The buffer circuit transforms the signal impedance from high (instrument output) to low (converter input), and the switchable circuitry allows dynamic adjustment of impedance parameters to match different loading conditions, ensuring optimal signal transfer without degradation
2Reliability
If an impedance conversion device is added to convert signal impedance, then signal quality improves, but device complexity increases
Solution Approach 1:
The impedance conversion device is designed with multi-functionality to reduce overall system complexity. The buffer circuit serves multiple purposes: impedance transformation, signal buffering, and isolation. The switchable circuitry provides both impedance matching and signal routing functions, allowing a single device to handle multiple signal paths and conditions without requiring separate dedicated circuits for each function
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 solution enables noise-free and undistorted signal conversion, allowing for accurate digital recording and playback of analog signals with minimal impact on sound quality, as the impedance conversion device maintains sound quality and corrects frequency characteristics, ensuring faithful digitization and analogization of signals.
Implementation Method 1
an impedance conversion circuit configured to convert an impedance of the third analog signal
Data Source
AI summary
An impedance conversion device includes: a first input terminal to which a first analog signal output from an electric musical instrument is input; a splitter configured to split the first analog signal into a second analog signal and a third analog signal; a first output terminal from which the second analog signal is output; an impedance conversion circuit configured to convert an impedance of the third analog signal; and a second output terminal from which an analog signal obtained by converting the impedance is output. An input impedance of the impedance conversion circuit is approximately 1 GΩ or more.