Polyphonic Guitar Tuner with Simultaneous String Detection
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Solution Overview
Problem
Conventional musical instrument tuners are inefficient for simultaneously tuning multiple strings, require serial measurement of each string, and often fail to provide accurate feedback in live performance settings, especially when only one string is out of tune, due to their limited display capabilities and reliance on single-channel pickups.
Innovation Solution
A tuner with a mode selector that allows users to switch between polyphonic and monophonic display modes, enabling simultaneous pitch frequency determination of multiple strings using a single audio channel, and automatic signal classification to optimize display modes for monophonic or polyphonic signals, providing detailed information for precise tuning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional tuning device measures one pitch frequency at a time, then the device can provide accurate frequency deviation display, but the tuning process becomes time-consuming and requires serial measurement of each string
Solution Approach 1:
The patent segments the polyphonic signal into multiple frequency components using bandpass filters, allowing simultaneous measurement of multiple strings. Each filter band corresponds to a specific string frequency range, enabling parallel processing of multiple pitch frequencies while maintaining accurate frequency deviation display for each string
Solution Approach 2:
The patent transitions from monophonic to polyphonic measurement by adding frequency dimension analysis. The signal analyzer processes multiple frequency bands simultaneously, displaying frequency deviation information for multiple strings at once, thus converting a sequential one-dimensional measurement process into a parallel multi-dimensional process
2Ease of operation
If a conventional tuning device displays only one frequency at a time, then the display remains simple and clear, but the device cannot provide simultaneous tuning information for multiple strings
Solution Approach 1:
The display is segmented into multiple regions, each showing frequency deviation information for a specific string. The first display region shows information for a first string while the second display region shows information for a second string, allowing simultaneous presentation of multiple tuning statuses without overwhelming the user
Solution Approach 2:
Different parts of the display provide different types of information optimized for their purpose. Each display region is tailored to show relevant frequency deviation data for its corresponding string, with visual indicators customized to highlight tuning status, thus maintaining local clarity while providing global overview
3Device complexity
If a single-channel pickup is used for all strings, then the device structure remains simple and no instrument modification is needed, but the device cannot distinguish between multiple simultaneous strings
Solution Approach 1:
The single-channel pickup signal is segmented into multiple frequency bands using bandpass filters. Each filter isolates a specific frequency range corresponding to a particular string, allowing the system to distinguish and process multiple simultaneous strings from a single composite audio channel without requiring multiple pickups or instrument modifications
Solution Approach 2:
Bandpass filters act as intermediaries between the single-channel pickup and the signal analyzer. These filters selectively pass specific frequency ranges while blocking others, enabling the system to separate and identify individual string frequencies from the mixed polyphonic signal without direct physical separation of the strings themselves
Data Source
AI summary
The present invention relates to a musical instrument tuner, e.g. a guitar tuner, featuring tuning as a part of a user session.