January 2015
Intermediate to advanced
454 pages
17h 1m
English
book
Communication Acoustics: An Introduction to Speech, Audio and Psychoacoustics
by Ville Pulkki, Matti Karjalainen
Content preview from Communication Acoustics: An Introduction to Speech, Audio and Psychoacoustics
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.
15Time–Frequency-domain Processing and Coding of Audio
A common trend in the field of audio is to process the audio signal in the time–frequency domain. In other words, the input audio signal is divided into a number of frequency bands which are processed separately and also depending on time. The aim in such processing is, for example, data compression, audio effects, or the enhancement of audio quality. The benefit of time–frequency processing in such tasks is that the structure of human hearing mechanisms is based on similar time–frequency analysis of the ear canal signals. Already many applications, such as the perceptual coding of audio, take advantage of the human hearing resolution in the time–frequency domain. An emerging field is multi-channel and spatial applications utilizing time–frequency processing.
15.1 Basic Techniques and Concepts for Time–Frequency Processing
The use of time–frequency transforms to visualize audio signals was already touched on in Section 3.2.6 on page 53. This chapter elaborates on the techniques and introduces some phenomena, concepts, and issues related to the processing of audio in the time–frequency domain. We will describe the time–frequency processing methods first using the concepts of frame-based analysis, and second using the concepts of downsampled filter banks.
5.1.1 Frame-Based Processing
Many time–frequency-domain audio techniques are implemented such that an input signal(s) is first divided into overlapping time frames, after ...
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Read now
Unlock full access
More than 5,000 organizations count on O’Reilly
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.