Download Introduction to Media Computation: A Multimedia Cookbook in by Mark J. Guzdial PDF

By Mark J. Guzdial

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Extra info for Introduction to Media Computation: A Multimedia Cookbook in Python

Example text

Delimited on either end with a quote character. A filename is just a string whose characters represent a path, path delimiters, and a base file name. Pictures are encodings of images, typically coming from a JPEG file. Sounds are encodings of sounds, typically coming froma WAV file. Here are the functions introduced in this chapter: CHAPTER 2. INTRODUCTION TO PROGRAMMING 40 ord abs pickAFile makePicture show makeSound play Returns the equivalent numeric value (from the ASCII standard) for the input character.

The first part of the process of digitizing sound is handled by the computer’s hardware—the physical machinery of the computer. If a computer has a microphone and appropriate sound equipment (like a SoundBlaster sound card on Wintel computers), then it’s possible, at any moment, to measure the amount of air pressure against that microphone as a single number. 1. 9: Viewing a sound in spectrum view with multiple “spikes” numbers correspond to rarefactions. We call this an analog-to-digital conversion (ADC)—we’ve moved from an analog signal (a continuously changing sound wave) to a digital value.

Returns the sound. Plays a sound provided as input. No return value. Exercises Exercise 9: Try some other operations with strings in JES. What happens if you multiple a number by a string, like 3 * "Hello"? What happens if you try to multiply a string by a string, "a" * "b"? Exercise 10: You can combine the sound playing and picture showing commands in the same recipe. Trying playing a sound and then show a picture while a sound is playing. Try playing a sound and opening several pictures while the sound is still playing.

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