A two-microphone diversity system and its application for hands-free car kits
| Autor: | Klaus Linhard, Juergen Freudenberger |
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| Rok vydání: | 2005 |
| Předmět: | |
| Zdroj: | INTERSPEECH Scopus-Elsevier |
| DOI: | 10.21437/interspeech.2005-743 |
| Popis: | In this paper we consider a two-channel diversity technique thatcombines the processed signals of two separate microphones.Forin-car applications, this enables a better compromise forthemicrophone positions. The advantage of the proposed systemis its insensitivity with respect to varying speaker sizes or lo-cal noise sources. To achieve this we choose the microphoneposition in that way that one microphone is optimum for a tallspeaker, and the second one is suitable for a small speaker. Forlocal noise sources we may apply a similar design to choosethe microphone position in accordance with the location of thenoise sources. A corresponding signal combiner has to tasks:compensation of phase shifts and weighting proportional to thesignal strength. We propose solutions for both problems anddemonstrate the effectiveness of diversity combining. 1. INTRODUCTION Due to the obvious dangers of holding a telephone in one hand,and steering a car with the other, many countries either stronglyrecommended, or legally enforced hands-free telephone oper-ation in all moving vehicles. Thus for safety and comfort rea-sons,ahands-freetelephonesystemthatprovidesthesamequal-ity of speech as conventional fixed telephones is desirable. Anatural bottleneck for the speech quality of a hands-free car kitis the position of the microphone. Obviously, speech has tobe picked up as close to the mouth as possible. The importantquestion, where to place the microphone inside the car, is how-ever difficultto answer. The |
| Databáze: | OpenAIRE |
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