The document discusses the NI myRio and its capabilities for reading image and audio files. The NI myRio can read PNG, JPEG, and BMP image formats. It can only read audio in WAV format. PNG is best for images with sharp edges or no gradients, while JPEG is better for photos with gradients. BMP has both indexed and direct color depths but results in large file sizes. Microphones convert sound waves to electrical signals, with different types using various methods, and stereo microphones capture two channels of sound for left and right arrival times.

1. Ni myRio and microphone
Author: Minh Anh Nguyen
Colorado State University
School of Biomedical and Electrical Engineering
Email: minhanhnguyen@q.com

2. NI myRio
• Image format files: can only read the
following format.
– Png: LabView code for comparing two image files;
algorithm is done
– Jpeg
– Bmp
• Microphone:
– Audio format file: can read the “wav”

3. Image file format: PNG
• Portable Network Graphics
• line art, text-heavy images, and images that have
large contiguous blocks of color
• Small file sizes, but at no damage to the quality
• PNG has higher image quality than a JPEG
• Makes great screenshots if there are no gradients
in the original source.
• PNG is probably the better choice when you need
pixel-perfect images for vector illustrations
• PNG is supported in Netscape 4.03 and above
• Color depth: Index
– Indexed means that the image can only store a limited
number of colors (usually 256), controlled by the
author, in something called a Color Map

4. Image file format: JPEG
• Joint Photographic Experts Group
• Photographs and realistic images
• Poor quality around sharp edges, etc., and for
this reason it is unsuitable for most web
graphics.
• Smooth gradients and softer images
• Handles only still images
• Color depth: direct
– Direct means that you can store many thousands
of colors that have not been directly chosen by
the author

5. Image file format: BMP
• Bitmap
• Very large file sizes
• It can have color depths of both Indexed and
Direct
• BMP is higher quality than jpeg, but large in
file size.

6. Microphone
• Microphones are a type of transducer - a device
which converts energy from one form to another.
• Convert acoustical energy (sound waves) into
electrical energy (the audio signal)
• Different types of microphones have different
ways of converting energy but they all share one
thing in common:
• hand-held microphone
• The loudspeaker is also a transducer - it converts
the electrical energy back into acoustical energy.

7. Sounds
• Mono sounds: can be represented as a really
long vector
• Stereo sounds: two really long vectors put
together
– Hand-held microphone
– Two channels (Left and Right)
– Microphone captures sounds at differing times
because of their physical separation, and so record
time-of-arrival information in the two channels
– Microphone captures sound sources in differing
levels between the two channels