Design of Circular Differential Microphone Arrays by Jacob Benesty, Jingdong Chen, Israel Cohen

By Jacob Benesty, Jingdong Chen, Israel Cohen

Recently, we proposed a totally novel and effective solution to layout differential beamforming algorithms for linear microphone arrays. because of this very versatile method, any order of differential arrays should be designed. in addition, they are often made strong opposed to white noise amplification, that is the most inconvenience in these kind of arrays. the opposite famous challenge with linear arrays is that digital steerage is not feasible.

during this ebook, we expand these kind of primary rules to round microphone arrays and express that we will layout small and compact differential arrays of any order that may be electronically urged in lots of diverse instructions and provide an excellent measure of regulate of the white noise amplification challenge, excessive directional achieve, and frequency-independent reaction. We additionally current a few functional examples, demonstrating that differential beamforming with round microphone arrays is one of the most sensible applicants for functions regarding speech enhancement (i.e., noise aid and dereverberation). the vast majority of the fabric awarded is new and should be of serious curiosity to engineers, scholars, and researchers operating with microphone arrays and their functions in all kinds of telecommunications, safeguard and surveillance contexts.

Show description

Read or Download Design of Circular Differential Microphone Arrays PDF

Similar & telecommunications books

WiMAX Network Planning and Optimization

Книга WiMAX community making plans and Optimization WiMAX community making plans and OptimizationКниги Сетевые технологии Автор: Yan Zhang Год издания: 209 Формат: pdf Издат. :Auerbach courses Страниц: 443 Размер: 6,8 ISBN: 978-1-4200-6662-3 Язык: Английский0 (голосов: zero) Оценка:This publication deals a finished rationalization on the way to measurement, plan, and optimize WiMAX networks.

Regulation and Entry into Telecommunications Markets

This booklet examines pageant and rules within the liberalized telecommunications markets. It fills the distance among the prevailing fiscal literature on festival and the real-life program of concept to coverage. Paul de Bijl and Martin Peitz study a large diversity of industry constellations; particularly, the recent subject of entry expense law in uneven markets.

Radio Frequency Integrated Circuit Design

Radio frequency built-in circuits (RFICs) are the construction blocks that permit each equipment from cable tv units to cellular phones to transmit and obtain indications and knowledge. This newly revised and increased variation of the 2003 Artech apartment vintage, "Radio Frequency built-in Circuit Design", serves as an updated, useful reference for whole RFIC knowledge.

Wireless Communications over MIMO Channels: Applications to CDMA and Multiple Antenna Systems

Instant Communications over MIMO Channels: purposes to CDMA and a number of Antenna platforms covers either, state of the art channel coding suggestions and CDMA and a number of antenna platforms, infrequently present in different books at the topic. moreover, a data theoretical research of CDMA and SDMA structures light up final limits and demonstrates the excessive power of those suggestions.

Extra info for Design of Circular Differential Microphone Arrays

Example text

M B [h (ω) , −θ] = ∗ Hm (ω) ej cos (−θ − ψm ) ∗ Hm (ω) ej cos (θ + ψm ) . 36) is verified if and only if cos (θ − ψM−m+2 ) . 40) 26 2 Problem Formulation Hm+1 (ω) = HM−m+1 (ω) , m = 1, 2, . . , M − 1. 41) We observe that in the filter h (ω) of length M , only its first M 2 + 1 coefficients need to be optimized, where x is the integer part of x. This also means that only M 2 + 1 independent constraints are possible. As a result, with a UCA of M microphones, we can design any differential array up to the order M at the steering angle θs = 0.

14 The white noise gain of the first-order hypercardioid (with three microphones), as a function of frequency, for different values of δ: (a) δ = 1 cm, (b) δ = 2 cm, (c) δ = 3 cm, and (d) δ = 5 cm. 0 f (kHz) (d) Fig. 15 The white noise gain of the first-order supercardioid (with three microphones), as a function of frequency, for different values of δ: (a) δ = 1 cm, (b) δ = 2 cm, (c) δ = 3 cm, and (d) δ = 5 cm. From all the extensive simulations presented in this chapter, we can conclude that any first-order directivity pattern can be designed with a 3-element UCA, which can perfectly steer in three different directions.

We observe from simulations that a second-order dipole with a good compromise between the directivity factor and the white noise gain should be designed with an interelement spacing between 2 and 3 cm. 2 Second-Order Cardioid In the second-order cardioid, there is a one at the angle θs = 0 and two nulls at the angles θs + π/2 and θs + π. We see that θ2,1 = π/2, θ2,2 = π, β2,1 = 0, and β2,2 = 0. 6). 4 shows the patterns of the second-order cardioid with four microphones for several frequencies and two values of δ (1 and 2 cm).

Download PDF sample

Rated 4.95 of 5 – based on 41 votes