They were called functionless continuants and semivowels in the old IPA consonant table (1951).

The methods of traffic noise reduction of facing street high-level residential building: a case in Beijing;

In this paper,a rational evaluation system of traffic noise combined with human health characteristic is set up based on fuzzy theory,and the weight vectors are established with analytic hierarchy process(AHP)-mediation method.

Asphalt rubber pavement can improve using property of road, as well as reduce traffic noise.

In view of the limitation of signal dotting and phonetic communication device used for coal mine,a kind of flameproof signal dotting and phonetic carrier-current communication device especially suited to satisfy the current needs of modernization mine production with high-capacity and high-efficiency is designed,its effects and performance has been validated.

Design and realization of multi-hopping voice communication system based on VoWPAN and Bluetooth;

Design and Implementation of Voice Communication System Based on P2P;

A method of voice communication of remote fault diagnosis system of CNC machine is introduced,this method uses WIN API function based on Internet networks.

Research on Information Supervision and the Speech Communication System in Specialize Train;

Design and Realization of the Safeguard Speech Communication System in Intelligent Resident District;

Design on emitter of solar blind ultraviolet ray speech communication system

Taking the modulated signal,one of the typical narrow-band random processes,as an example,this paper simulates the whole process of speech communication in the white Gauss noise background,and compares the quality of speech signal taking coherent demodulation method with the one taking envelope demodulation method.