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React Native Blueprints

You're reading from   React Native Blueprints Create eight exciting native cross-platform mobile applications with JavaScript

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Product type Paperback
Published in Nov 2017
Publisher Packt
ISBN-13 9781787288096
Length 346 pages
Edition 1st Edition
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Author (1):
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Emilio Rodriguez Martinez Emilio Rodriguez Martinez
Author Profile Icon Emilio Rodriguez Martinez
Emilio Rodriguez Martinez
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Table of Contents (9) Chapters Close

Preface 1. Shopping List FREE CHAPTER 2. RSS Reader 3. Car Booking App 4. Image Sharing App 5. Guitar Tuner 6. Messaging App 7. Game 8. E-Commerce App

Overview

The concept of how a guitar is tuned should be simple to understand: each of the six strings of a guitar emits a sound at a specific frequency when played open (that is when no fret is pushed). Tuning a guitar means tightening the string until a specific frequency is emitted. This is the list of frequencies each string should emit to be standard tuned:

The digital process of tuning a guitar will follow these steps:

  1. Record a live sample of the frequencies captured through the device's microphone.
  2. Find the most prominent frequency in that sample.
  3. Calculate what is the closest frequency in the preceding table to detect what string is being played.
  4. Calculate the difference between the frequency emitted and the standard tuned frequency for that string, so we can let the user correct the string tension.

There are also some pitfalls we need to overcome, like ignoring...

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