# Semi-Automatic Artificial Lips Device for Brass Instruments with Real-Time Pitch Feedback Control

## TL;DR

A device that allows brass instrument players to produce sound without vibrating their lips, using artificial lips and real-time feedback for pitch control.

## Contribution

A compact, semi-automatic brass instrument control system with real-time pitch feedback and artificial lips.

## Key findings

- The device produces comparable harmonic structures to traditional brass playing.
- The system achieves practical pitch ranges and reliable harmonic mode changes.
- Real-time acoustic feedback enhances pitch stability during performance.

## Abstract

We propose a semi-automatic artificial lips control device that allows a human performer to produce sound on a brass instrument without the need to vibrate their own lips. The device integrates position control that presses artificial lips toward the mouthpiece and aperture control via wire traction, together with a pre-calibrated motor table and acoustic feedback for pitch stabilization. In evaluations using a euphonium, we verified timbre, pitch range, and pitch stabilization, including harmonic modes. The results showed that the harmonic structure of tones produced by a human using the device can be comparable to those produced by a human player in the conventional manner. Pitch-range and pitch-stabilization tests confirmed that the system can generate practical musical intervals and achieve reliable harmonic mode changes. Furthermore, real-time acoustic feedback improved pitch stability during performance. These findings demonstrate that, rather than fully automating human performance, the proposed system provides a compact and reproducible framework for controllable brass sound generation and pitch stabilization using only three actuators.