---
title: "Accurately Aiming Audio With An Ultrasonic Array"
url: https://daily.dev/posts/accurately-aiming-audio-with-an-ultrasonic-array-0tu40p8nk
source_url: https://hackaday.com/2026/01/18/accurately-aiming-audio-with-an-ultrasonic-array/
type: article
source: "Hackaday"
published: 2026-01-18T21:11:40.004Z
updated: 2026-03-15T05:24:29.958Z
tags: ["hardware", "physics", "signal-processing"]
reading_time: 2
upvotes: 0
comments: 0
language: en
---

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# Accurately Aiming Audio With An Ultrasonic Array

**[Hackaday](https://daily.dev/sources/hackaday)** · 2 min read · 0 upvotes · 0 comments

## Summary

A maker built a directional speaker using a 40 kHz ultrasonic array that projects a narrow beam of sound toward a specific target. The device works by exploiting the short wavelength of ultrasonic frequencies and using constructive/destructive interference from parallel emitters. When amplitude modulation is applied to the ultrasonic signal, the air itself demodulates it into audible sound due to nonlinear propagation effects. The circuit uses a 555 timer for the ultrasonic driver, and the beam can be reflected off hard surfaces, though indoor reflections reduce directivity.

## Full article

daily.dev links to this article rather than hosting it. Read it at the original source: <https://hackaday.com/2026/01/18/accurately-aiming-audio-with-an-ultrasonic-array/>

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---

Tags: [#hardware](https://daily.dev/tags/hardware), [#physics](https://daily.dev/tags/physics), [#signal-processing](https://daily.dev/tags/signal-processing)

[View this post on daily.dev](https://daily.dev/posts/accurately-aiming-audio-with-an-ultrasonic-array-0tu40p8nk)