فاصله بین سقوط ایلخانان (736 ق) تا روی کار آمدن صفویان (907 ق) از پرآشوب­ترین و آشفته­ترین دوره­های تاریخ ایران است که عرصه را برای نضج و قدرت­گیری حکومت­های مختلفی در گوشه و کنار ایران فراهم آورد. جغرافیای سیاسی قبایل کُرد در غرب و شمال غرب که صحنه قدرت­نمایی آل جلایر، تیموریان، قراقویونلوها و آق قویونلوها بود از جمله حوزه­های موردتوجه و فعالیت حکومت­های مورد اشاره بود. پژوهش حاضر درصدد پژوهش د...

In a previous paper [1], a coding principle based upon non-uniform transmission of signal samples was introduced. This coding principle relies on the use of an efficient prediction/reconstruction algorithm for non uniformly sampled signals in both the transmitter and the receiver. Recently, we proposed an adaptive ARMA estimation method for time series with missing samples [2]. The purpose of t...

Voice over Internet Protocol (VoIP) is a revolutionary technology which is acting as a platform for the development of latest trends in modern communication world. The speech signal quality in VoIP is governed by the speech coding techniques employed. Currently various standard coders like FS-1015(LPC-10), ITU-G.711, ITU-G.726, FS-1016(ITU-G.728), etc. are used to digitize the speech signal. Mo...

In this research, we propose to implement Secure Real Time Transport Protocol (SRTP) on VoIP services in campus environment. Today, the deployment of VoIP in campus environment over wireless local area network (WLAN) is not considered on security during communication between two parties. Therefore, this study is to analyzed SRTP performance on different VoIP codec selection over wired. We have ...

This paper presents bandwidth-efficient speech transmission systems using rate-compatible channel coders and variable bitrate embedded source coders. Rate-compatible punctured convolutional codes (RCPC) are often used to provide unequal error protection (UEP) via progressive bit puncturing. RCPC codes are well suited for constellations for which Euclidean and Hamming distances are equivalent (B...