Tag Archives: apertures,

Study and Design of Differential Microphone Arrays

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Jacob Benesty, Jingdong Chen, "Study and Design of Differential Microphone Arrays"
English | 2013 | ISBN-10: 364233752X, 3642427561 | 180 pages | PDF | 6 MB

Study and Design of Differential Microphone Arrays
Microphone arrays have attracted a lot of interest over the last few decades since they have the potential to solve many important problems such as noise reduction/speech enhancement, source separation, dereverberation, spatial sound recording, and source localization/tracking, to name a few. However, the design and implementation of microphone arrays with beamforming algorithms is not a trivial task when it comes to processing broadband signals such as speech. Indeed, in most sensor arrangements, the beamformer output tends to have a frequency-dependent response. One exception, perhaps, is the family of differential microphone arrays (DMAs) who have the promise to form frequency-independent responses. Moreover, they have the potential to attain high directional gains with small and compact apertures. As a result, this type of microphone arrays has drawn much research and development attention recently. This book is intended to provide a systematic study of DMAs from a signal processing perspective. The primary objective is to develop a rigorous but yet simple theory

for the design, implementation, and performance analysis of DMAs. The theory includes some signal processing techniques for the design of commonly used first-order, second-order, third-order, and also the general Nth-order DMAs. For each order, particular examples are given on how to form standard directional patterns such as the dipole, cardioid, supercardioid, hypercardioid, subcardioid, and quadrupole. The study demonstrates the performance of the different order DMAs in terms of beampattern, directivity factor, white noise gain, and gain for point sources. The inherent relationship between differential processing and adaptive beamforming is discussed, which provides a better understanding of DMAs and why they can achieve high directional gain. Finally, we show how to design DMAs that can be robust against white noise amplification.
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Storytellers: A Photographer’s Guide to Developing Themes and Creating Stories with Pictures by Jerod Foster [REPOST]

Storytellers: A Photographer's Guide to Developing Themes and Creating Stories with Pictures by Jerod Foster
New Riders | 2011 | ISBN: 0321803566 | 288 pages | EPUB | 30 MB
Storytellers: A Photographer's Guide to Developing Themes and Creating Stories with Pictures by Jerod Foster
All images tell a story. Whether they're produced as works of art, on assignment for National Geographic, or as part of a family vacation, images say more than just a shutter speed, ISO, or aperture setting. We make images for a reason.

It's amazing how many images the world's photographers produce! Professional or not, images surround us in our everyday lives. What makes successful photographers stand out? What drives us to revisit the same images over and over?

All images tell a story. Whether they're produced as works of art, on assignment for National Geographic, or as part of a family vacation, images say more than just a shutter speed, ISO, or aperture setting. We make images for a reason.

Storytellers, by photographer/teacher Jerod Foster, focuses on visual storytelling and how a deep knowledge of your process and your personal vision can create stronger images. Storytelling often requires the use of certain lenses, apertures, or light modifiers, but the story is what holds everything together. To become a better storyteller you will explore:
Composition, light, depth of field, and motion and how to properly use your camera technically to dig deeper.
Visual themes and how they provide stories with interest and depth
Types of shots and shooting styles and what they convey in your images
Research and ways to conceptualize your story before shooting
Strategies for developing your own effective storytelling workflow during and after the shoot.
This beautifully written and illustrated guide will help you connect the how-tos of digital photography with the who, what, when, where and why of storytelling to bring your vision and your images to life!

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