Digital modulation differents kind and aplications form them. Digital Modulation Techniques The techniques used to modulate digital information so that it can be transmitted via microwave‚ satellite or down a cable pair are different to that of analogue transmission. The data transmitted via satellite or microwave is transmitted as an analogue signal. The techniques used to transmit analogue signals are used to transmit digital signals
Premium Modulation
signals between two or more points in a communications system. Advantages of Digital Transmission • Noise immunity • Ease of processing and combining • Ease of measuring and evaluating • Disadvantages of Digital Transmission • Requires more bandwidth • Necessitates encoding and decoding circuitry • Requires precise time synchronization • Incompatible with older analog transmission systems Pulse Modulation Pulse Modulation consists essentially of sampling analog information signals and
Premium Modulation Digital signal processing Binary numeral system
telephone or other communications device as a result of coupling between transmission circuits. Waveguides - A system of material boundaries in the form of a solid dielectric rod or dielectric-filled tubular conductor capable of guiding high-frequency electromagnetic waves. FTTH – Fiber-to-the-home the fiber reaches the boundary of the living space‚ such as a box on the outside wall of a home in order to provide electronic connection. Simplex – Of or relating to a telecommunications system
Premium
PULSE MODULATION TECHNIQUES INTRODUCTION • Modulation is the process of frequency translation in which any one parameter(Amplitude‚ frequency or phase) of high frequency carrier signal is varied in accordance with instantaneous value of low frequency modulating signal. • Modulation is either analog or digital. INTRODUCTION • Many signals in modern communication systems are digital • Additionally‚ analog signals are transmitted digitally • Digitizing a signal results in reduced distortion
Premium Modulation
in the modulation of DSB-SC are: A message signal and carrier signal are fed in to a mixer which effectively modulates the message signal. The figure below demonstrates this step: Mathematically‚ this is expressed as the following: The resultant waveform can be demodulated by multiplying the modulated signal by the carrier signal of the same frequency and then using the low pass filter to filter out the remaining frequencies to get the frequency required. In terms of the frequency domain
Premium Phase Modulation Wave
Amplitude Modulation and Angle Modulation Abstract— The aim of this document is to improve understanding of amplitude modulation and angle modulation. We have done this by using Lab view. We have shown 4 types of Amplitude Modulation & 2 types of Angle Modulation. Keywords-amplitude modulation (AM)‚ angle modulation‚ double side band modulation (DSB)‚ double sideband suppressed carrier modulation (DSB-SC)‚ double sideband full carrier modulation (DSB-FC)‚ single side band modulation(SSB)
Premium Modulation
Journal of Biomaterials Applications http://jba.sagepub.com/ Modulation of Gene Expression of Rabbit Chondrocytes by Dynamic Compression in Polyurethane Scaffolds with Collagen Gel Encapsulation Peng-Yuan Wang‚ Hsiang-Hong Chow‚ Wei-Bor Tsai and Hsu-Wei Fang J Biomater Appl 2009 23: 347 originally published online 12 August 2008 DOI: 10.1177/0885328208093684 The online version of this article can be found at: http://jba.sagepub.com/content/23/4/347 Published by: http://www.sagepublications
Premium Gene expression Extracellular matrix Collagen
Pulse-Time Modulation In pulse-modulated systems‚ as in an analog system‚ the intelligence may be impressed on the carrier by varying any of its characteristics. In the preceding paragraphs the method of modulating a pulse train by varying its amplitude was discussed. Time characteristics of pulses may also be modulated with intelligence information. Two time characteristics may be affected: (1) the time duration of the pulses‚ referred to as PULSE-DURATION MODULATION (pdm) or PULSE-WIDTH MODULATION
Premium Modulation
Hierarchal Modulation 1. Theory Wireless transmission of image and video data in hostile mobile environments necessitates for a system which guarantees the quality of the data using effective error protection while at the same time ensures continues video streaming [1]. Unequal Error Protection is a technique which makes use of the fact that not all data in a video stream is equally important [1]. Based on the study first presented in [2]‚ data can be divided into different categories based on
Premium Streaming media Modulation Internet television
Frequency Modulation Xavier University – Ateneo de Cagayan Submitted by: Submitted to: Dapal‚ Jamie Daisylette Engr. Mary Jean Apor Fermano‚ Jerick James Oraiz‚ Gerard James Sabunod‚ Shane John Siman‚ Lester C. Objectives: 1. To obtain a frequency modulated signal via direct method 2. To understand the process of frequency modulation by direct method Background Theory: Frequency modulation uses the information signal‚ Vm(t) to vary
Premium Modulation