An Introduction to Audio Content Analysis: Applications in by Alexander Lerch

By Alexander Lerch

With the proliferation of electronic audio distribution over electronic media, audio content material research is quickly turning into a demand for designers of clever signal-adaptive audio processing platforms. Written by means of a well known specialist within the box, this ebook presents easy accessibility to diverse research algorithms and permits comparability among diverse ways to a similar activity, making it valuable for beginners to audio sign processing and specialists alike. A overview of appropriate basics in audio sign processing, psychoacoustics, and song conception, in addition to downloadable MATLAB records also are included.

Please stopover at the better half web site: www.AudioContentAnalysis.org

Content:
Chapter 1 creation (pages 1–5):
Chapter 2 basics (pages 7–30):
Chapter three on the spot beneficial properties (pages 31–69):
Chapter four depth (pages 71–78):
Chapter five Tonal research (pages 79–117):
Chapter 6 Temporal research (pages 119–137):
Chapter 7 Alignment (pages 139–150):
Chapter eight Musical style, Similarity, and temper (pages 151–162):
Chapter nine Audio Fingerprinting (pages 163–167):
Chapter 10 track functionality research (pages 169–179):

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Additional info for An Introduction to Audio Content Analysis: Applications in Signal Processing and Music Informatics

Example text

The term fall scale refers to the highest quantization step. A full-scale sine wave will thus have an amplitude equaling the highest quantization step (compare also page 72). These considerations are often only of limited use to the signal processing algorithm designer, as the quantized signal is usually converted to a signal in floating point format, effectively resulting in a non-linear characteristic line of the quantizer. The floating point stores the number's mantissa and exponent separately so that the quantization step size A Q basically increases with the input amplitude.

The PDF of quantized input signals has a limited set of amplitude classes as a quantized signal has only a limited set of amplitude values. The PDF of a signal can be estimated from a sufficiently long block of samples by computing a histogram of signal amplitudes and dividing it by the number of observed samples. It is then sometimes referred to as Relative Frequency Distribution (RFD). For the sake of simplicity the PDF and the RFD will not be differentiated in the following. 2 Signal Processing The following chapters introduce methods for processing digital signals.

More specifically, computing the CCF of two blocks of length K. requires a minimum FFT length of 2AC. Frequency Domain Compression In certain applications such as auditory processing it might be of interest to apply a nonlinear compression function to the magnitude spectrum before transforming it back. Tolonen and Karjalainen named such a combined approach the generalized ACF to be computed by (see Sect. 2, [28]) rßxxM=r1{\X{^)\ß}. 74) A value ß = 2 would result in the normal ACF. 7 Linear Prediction The idea of linear prediction is to use preceding (sample) values to estimate (or predict) future values.

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