Assignment 55 - Frequency Player

Example Image

Goals

The purpose of this assignment is to learn to

• Use methods/functions to compartmentalize code
• Use loops to iterate over large quantities of items
• Apply simple mathematical concepts in code
• Understand and cast between data types

Description

Tasks

• Complete the generateSineSample() method. It should return a sample value according to the mathematical formula for a sine wave, which is A * sin(2 * pi * f * t), where A is amplitude, f is frequency, and t is time.
• Reassign firstSample and lastSample so that they use the start and end parameters in the method. start and end are measured in seconds, so you'll need to convert those to sample indices somehow.
• If a sine wave ends on a sample value other than zero, it makes a noticeable cracking noise. Try listening for it in the middle of the clip after completing step 2. To fix this, you'll need to reassign lastSample so that it's close to the end second, but still ends on a sample with a value of zero. The period variable may be useful for this, although it isn't strictly necessary.

Important Functions

• Math.sin() outputs the sine of the value passed into it.
• ac.getSampleRate(), where ac is an AudioClip, gets the sample rate of that AudioClip.
• ac.setSample(channel, index, value), where ac is an AudioClip, sets the sample at the index to the value passed in. See the documentation for language-specific details.

Help

For Java

AudioClip documentation

For C++

AudioClip documentation

For Python

AudioClip documentation