Speech Enhancement Techniques for Digital Hearing Aids by Komal R. Borisagar & Rohit M. Thanki & Bhavin S. Sedani

Author:Komal R. Borisagar & Rohit M. Thanki & Bhavin S. Sedani
Language: eng
Format: epub
ISBN: 9783319968216
Publisher: Springer International Publishing

6. Transient noise : A transient noise and impulse noise are very similar kinds of noises: the main difference is that a transient noise pulse is broad in nature.

3.5.1 Sources of Noise

The most important dominant noises that affect speech signal widely are classified as follows.

3.5.1.1 Different Road Traffic Noises

Most deaf people are expected to interact with people in their routine life. At the time of some of the conversations, it is possible that the person may be out of his home. Generally road traffic and vehicles are the most important type of noise in social life. All vehicles generate heavy interference in the hearing aids with processing of the speech signal. Generally all these vehicles travel by means of specific types of engine. The engine will generate noise in the form of spark plugs and motors and the exhaust systems when burning the fuel of large heavy vehicles. With this generation, the structure of the city amplifies these noises in narrow streets and very high multistory buildings, forming an environment where signals are generated and reflected back in the form of echoes. The nature of truck starting noises and traffic jam noise are shown in Figs. 3.9 and 3.10, respectively. Moreover, in the metro cities, nowadays this problem is more serious. In most of the big cities, a huge amount of traffic is also generated by airports. The cockpit and engine noises of low-flying aircraft, charter planes, helicopters, and air force planes have added very cumbersome noise levels to the system of speech enhancement. In addition, locomotive engines, horns, and whistles and switching and shunting operations in railyards can deeply impact noise increments.

Fig. 3.9(a) Truck starting noise signal . (b) Single-sided amplitude spectrum of signal

Download

Copyright Disclaimer:
This site does not store any files on its server. We only index and link to content provided by other sites. Please contact the content providers to delete copyright contents if any and email us, we'll remove relevant links or contents immediately.