A Comparitive Review on IP Based Voice Communication Systems

IJIRST –International Journal for Innovative Research in Science & Technology| Volume 3 | Issue 03 | August 2016 ISSN (online): 2349-6010

A Comparative Review on IP based Voice Communication Systems Ms. Jyoti Bhavi M. Tech. Student Department of Electronics & Communication Engineering R V College of Engineering, Bengaluru, India

Mrs. Sujata D. Badiger Assistant Professor Department of Electronics & Communication Engineering R V College of Engineering, Bengaluru, India

Abstract IP based voice communication systems combines all the features of an analog system with numerous additional features making a genuinely flexible communication system. Currently such systems are implemented using Voice over IP (VoIP) technology.

Though VoIP supports scalability of network and flexibility in enhancing the capabilities of network nodes, there are considerable impairments. Due to packetization of speech signals, the impairments like delay, jitter, decoder clock offset and packet loss are observed. Open Media Networking Architecture (OMNEO) is the newly blooming technology to overcome these impairments. This paper gives general overview of VoIP technology followed by its advantages and disadvantages in brief. A comparison of present IP based communication systems available in the market released by the telecommunication firms is tabulated. The paper concludes with the basics of OMNEO technology and its comparison with VoIP. Keywords: IP Based System, VoIP, OMNEO, Audio Quality, Latency _______________________________________________________________________________________________________ I.

INTRODUCTION

Communication systems involve various processes by which information is exchanged between two end points. There are two types of voice communication systems namely analog and digital. The main drawbacks of the analog system are requirement of dedicated cables, non-scalable, high maintenance cost and small area coverage. To overcome these drawbacks, digital communication systems were developed. Majority of the digital systems are IP based systems [1].

IP based system applications are widespread. Smart homes, business applications and Education institutes use IP based systems to provide safe and secure communication. Especially security systems like intercom systems, industrial communication systems, conference systems, critical communication systems use VoIP technology as its backbone [2, 3].

VoIP is a technology which uses data networks to transmit voice or speech signal. The voice signal is digitized and encoded properly at source end of the communication line and sent as encoded digital packets through the data network. Packets are received at the destination, then decoded and reverted back to speech signals. Voice encoding standards likeG.711, G.726 and G.729 defined by IEEE are used for encoding the speech at the source and for decoding the speech at the destination [4].

Figure 1 gives the setup of a generalized VoIP based system. At the sender, the digitized voice of the speaker is encoded by a speech encoder, then packed and sent through the protocol stack. If the speaker is silent, the voice activity detection (VAD) recognizes the idleness and a packet without payload or no packet is generated. Then the packets are sent over the network.

Fig. 1: Block Diagram IP based system [4]

At the receiver, the conventional stack processes the packets. Then lost packets are re-requested through RTP. Since the packets might arrive in a varying flow, they are collected in a jitter buffer that adjusts arrival order and the time differences.

After rearranging the received packets in order, they are reassembled and then decoded by decoder and delivered through peripherals like loud speakers. This modularization makes VoIP flexible and the benchmarks compatible when new prerequisites and applications pops up due to customer demand.

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The paper is organized into various sections. Section II will discuss advantages and disadvantages of VoIP technology.

Section III contains industrial survey of IP based communication systems. It also includes a table which compares different companies with respect to technology parameters used for IP based systems. Section IV gives a holistic approach to overcome the disadvantages of VoIP technology by using OMNEO technology followed by conclusion in section V. II. ADVANTAGES AND DISADVANTAGES OF IP BASED VOICE COMMUNICATION SYSTEMS Migrating from analog systems to IP based systems is just like turning to most cost effective system. There is a substantial gain of benefits when switching from an analog to an IP-based system[5] as listed below.  IP based systems supports Unified Communications  IP based devices can be integrated to existing analog network  Enhanced service standards  Reusing or sharing of existing network assets  Improved safety, security and control on system As discussed above most of the security systems are IP based systems. So, switching to an IP-based security system enables to manage both security and public safety by a single party platform. By simplifying the operation and maintenance of security systems, they can be combined onto any IP network, instead of multiple analog devices. It is possible to use most of the existing equipment by integrating IP based systems to the existing IP network like cables, switches, and servers. Switching to an IP-based security system does not require giving up analog CCTV (Closed Circuit TV) and access control devices. To protect existing assets, most of the companies offer solutions for interfacing legacy systems to newly installed IP based systems. IP based systems are scalable and can be added or removed from any network at anytime.

However IP based communication systems offer above discussed advantages at the cost of voice quality and transmission delay. The numerous impairments which are responsible for low speech quality and network delay in the VoIP technology are as follows [6, 7]:  Packet Loss and Distortion  Poor echo cancellation  Jitter buffer Delay  Clock skew i.e., systems are not synchronized  Packetization and De-Packetization delay The effect of these drawbacks is negligible, when the IP based network is smaller. But when the network becomes wider and wider these impairments becomes intolerable. VoIP based systems require an interface to integrate with different vendor IP based systems. So the IP based era has the need of a technology which provides ease of integrating with different vendor IP products.

III. INDUSTRIAL SURVEY ON IP BASED COMMUNICATION SYSTEM Industrial survey helps to identify the features for an existing product updates or for new product manufacture. Commend, Clearcom, Valcom, Neumann and Jacques are a few companies which are developing IP based communication systems [8-12].

This survey lists the technology used by different companies and its important parameters like sampling frequency, CODECs and Bandwidth (BW) as given in Table 1.

Company Name Commend Clearcom Valcom Neumann Jacques

Table - 1 Industrial Product comparison table Technology Sampling Frequency VoIP 16KHz Instant Voice Core(IV Core) 16KHz VoIP 8KHz VoIP 12KHz VoIP 16KHz

CODEC G.722 G.722 8bits G.703 H.264

B. W. 96kbps 64kbps 86kbps 64kbps 128kbps

IV. OMNEO TECHNOLOGY FOR STUDIO QUALITY AUDIO AND ULTRA-LOW LATENCY IP BASED SYSTEM OMNEO is a media networking architecture for expert applications, created to accomplish better interoperability, ease of use, and execution given the advancing intricacy of current audio systems. OMNEO utilizes standard IP over Ethernet, which implies it can be actualized utilizing common infrastructure and third party devices. Media items that incorporate OMNEO can be gathered into systems of 2 to 10,000 cooperating devices that trade studio-quality synchronized multi-channel audio and share a typical control framework [13]. The architecture of OMNEO has two components and the same is as shown in the Figure 2.

OMNEO has two Components 

An audio program transport protocol suite that offers low-latency, high-quality multichannel audio stream exchange; and

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A Comparative Review on IP based Voice Communication Systems (IJIRST/ Volume 3 / Issue 03/ 032)



A robust control protocol suite that provides reliable and secure system control for pro media networks of all sizes, from small to intercontinental.

The transport component is Dante and the control component is Open Controlled Architecture (OCA). OMNEO enabled systems synchronize each other when they are connected to a network. So OMNEO provides Synchronization of the devices which are connected the network.

Fig. 2: OMNEO Components

OMNEO technology is used to develop a professional audio quality and low latency system. This is achieved by sampling frequency and encoder resolution and packetization method but at the cost of bandwidth. The Table 2 compares OMNEO and VoIP technologies.

Table - 2 Comparison of OMNEO and VoIP technology OMNEO Technology VoIP Technology Audio over IP Voice over IP Sampling Frequency - 48 KHz Sampling frequency -8 KHz Encoding resolution – 24bits Encoding resolution – 8bits All devices are synchronized No synchronization No compression and de-compression of packets Compression and de-compression of packets Low packetization delay (1ms) High packetization delay (20 ms - 30ms) Addition of new device does not affect overall system delay Addition of new device effects overall system delay

The quality of speech mainly depends on Sampling frequency, Encoder resolution, Packet loss and synchronization in case of IP based systems. The latency in IP network is due to packetization, compression and decompression algorithms. In OMNEO technology Dante involves no Compression and Decompression algorithm and takes very less packetization delay compared to that of VoIP technology. Thus OMNEO has the potential to overcome the advantages of present IP based technology at the cost of Bandwidth.

V. CONCLUSION This paper describes about the VoIP technology and its advantages and disadvantages. The industrial survey list outs the different companies and their respective IP technology parameters. Finally a best ever method named OMNEO technology to overcome the downsides of VoIP technology is discussed and OMNEO technology is compared against VoIP technology. This work clarifies that a professional audio quality and low latency IP based system can be developed using OMNEO technology at the cost of bandwidth.

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Jung-Sook Kim, “Development of the Digital Public Address System”, Proceedings of the 2012 IEEE International Conference on Computing Technology and Information Management (ICCM’12), vol. 2, pp. 638632, 2012.

Tsung-Hsing Lin, Liang-Bi Chen, Chung-Heng Chuang,Tung-Lin Lee, Chaio-Hsuan Chuang,” A Multi-Functions Digital Public Address System for Campus Broadcasting and Security” International Journal of Control and Automation, vol. 5, no. 3, pp. 267-276, Sep. 2012.

A. Z. Alkar, J. Roach and D. Baysal, "IP based home automation system," in IEEE Transactions on Consumer Electronics, vol. 56, no. 4, pp. 2201-2207, November 2010.

J. Gibson, “Speech coding methods, standards and applications,” IEEE Circuits Syst. Mag., Fourth quarter, pp. 30–40, 2005.

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A Comparative Review on IP based Voice Communication Systems (IJIRST/ Volume 3 / Issue 03/ 032) [5] [6] [7] [8] [9] [10] [11] [12] [13]

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"Valcom, Inc.". Valcom.com. N.p., 2016. Web. 21 June 2016.

GmbH, ms. "Ms Neumann Elektronik Gmbh". Neumann-elektronik.com. N.p., 2016. Web. 21 June 2016.

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