Signal - University of Vermont
... Changes in value have little effect on digital signals Noise and other forms of interference have little effect on digital signals Little chance of error because voltage in a digital circuit must be in one state or the ...
... Changes in value have little effect on digital signals Noise and other forms of interference have little effect on digital signals Little chance of error because voltage in a digital circuit must be in one state or the ...
Physical Layer - NOISE | Network Operations and Internet
... expressed as decibel levels per unit distance • Signal must have sufficient strength to be: – Detected by the receiver – Stronger than the noise in the channel to be received without error ...
... expressed as decibel levels per unit distance • Signal must have sufficient strength to be: – Detected by the receiver – Stronger than the noise in the channel to be received without error ...
ppt - NOISE
... expressed as decibel levels per unit distance • Signal must have sufficient strength to be: – Detected by the receiver – Stronger than the noise in the channel to be received without error ...
... expressed as decibel levels per unit distance • Signal must have sufficient strength to be: – Detected by the receiver – Stronger than the noise in the channel to be received without error ...
3.3 Digital Signals
... The voltage of a battery is a constant; this constant value can be considered a sine wave, as we will see later. For example, the peak value of an AA battery is normally 1.5 V. ...
... The voltage of a battery is a constant; this constant value can be considered a sine wave, as we will see later. For example, the peak value of an AA battery is normally 1.5 V. ...
Chapter 1 Data Communications and Networks Overview
... — Longer distances over lower quality lines ...
... — Longer distances over lower quality lines ...
William Stallings Data and Computer Communications
... Characteristics and quality determined by medium and signal For guided, the medium is more important For unguided, the bandwidth produced by the antenna is more important Key concerns are data rate and distance ...
... Characteristics and quality determined by medium and signal For guided, the medium is more important For unguided, the bandwidth produced by the antenna is more important Key concerns are data rate and distance ...
Chapter_4_Transmission Media
... Characteristics and quality determined by medium and signal For guided, the medium is more important For unguided, the bandwidth produced by the antenna is more important Key concerns are data rate and distance ...
... Characteristics and quality determined by medium and signal For guided, the medium is more important For unguided, the bandwidth produced by the antenna is more important Key concerns are data rate and distance ...
William Stallings Data and Computer Communications
... • Characteristics and quality determined by medium and signal • For guided, the medium is more important • For unguided, the bandwidth produced by the antenna is more important • Key concerns are data rate and distance ...
... • Characteristics and quality determined by medium and signal • For guided, the medium is more important • For unguided, the bandwidth produced by the antenna is more important • Key concerns are data rate and distance ...
03-DataTransmission new
... The signal is a function of time, but it can also be expressed as a function of frequency.. Will see soon Viewed as a function of time, an electromagnetic signal can be either analog or digital time domain concepts analog signal ...
... The signal is a function of time, but it can also be expressed as a function of frequency.. Will see soon Viewed as a function of time, an electromagnetic signal can be either analog or digital time domain concepts analog signal ...
Data Transmission
... where signal strength falls off with distance depends on medium received signal strength must be: ...
... where signal strength falls off with distance depends on medium received signal strength must be: ...
Layer 1: Encoding. Read Chapter 5-5.2
... JPEG: Joint Photographic Experts Group: Encodes one picture Assume 640x480 RGB with 24 bits/pixel Luminance: Y = 0.30R + 0.59G + 0.11B Block Preparation: Chrominance (I,Q) is averaged over 4 pixels: 320x240 Other compression techniques: DCT, quantization, differential quantization, run-lengt ...
... JPEG: Joint Photographic Experts Group: Encodes one picture Assume 640x480 RGB with 24 bits/pixel Luminance: Y = 0.30R + 0.59G + 0.11B Block Preparation: Chrominance (I,Q) is averaged over 4 pixels: 320x240 Other compression techniques: DCT, quantization, differential quantization, run-lengt ...
Wireless Sensor Networks
... Startup energy/time penalty can be high • Examples take 0.5 ms and 60 mW to wake up Exploit communication/computation tradeoffs • Might payoff to invest in rather complicated coding/compression ...
... Startup energy/time penalty can be high • Examples take 0.5 ms and 60 mW to wake up Exploit communication/computation tradeoffs • Might payoff to invest in rather complicated coding/compression ...
ECE 3552-Microcomputer System 2 Spring 2007 LAB Exercise # 1
... input needs only to be shifted from 24 to 14 bits, saving 6 more bits of data than just shifting. The 14-bit-data is then compressed to 8 bits, sent, and received. The receiver then expands the data and shifts it back to 24 bits to output the audio data. The result is very close in sound to the orig ...
... input needs only to be shifted from 24 to 14 bits, saving 6 more bits of data than just shifting. The 14-bit-data is then compressed to 8 bits, sent, and received. The receiver then expands the data and shifts it back to 24 bits to output the audio data. The result is very close in sound to the orig ...
Chapter 4. (Physical Layer) Digital Transmission (part 1)
... very low frequencies that present problems for a system that cannot pass low frequencies ...
... very low frequencies that present problems for a system that cannot pass low frequencies ...
FM – TUNER
... Figure 5. It is composed of the monophonic L+R signal at base-band, the 19KHz pilot tone, the double-side band modulated L-R signal at 38KHz, the Radio Data System (RDS) 1187.5BPS data at 57KHz and the Subsidiary Communications Authorization (SCA) FM signal at 67KHz. The decoding of the MPX stereoph ...
... Figure 5. It is composed of the monophonic L+R signal at base-band, the 19KHz pilot tone, the double-side band modulated L-R signal at 38KHz, the Radio Data System (RDS) 1187.5BPS data at 57KHz and the Subsidiary Communications Authorization (SCA) FM signal at 67KHz. The decoding of the MPX stereoph ...
Chapter 3 - William Stallings, Data and Computer Communications
... where signal strength falls off with distance depends on medium received signal strength must be: ...
... where signal strength falls off with distance depends on medium received signal strength must be: ...
War Driving
... – Serves as a “hub” for wireless clients. – Bridge between wired and wireless LANs. – Similar to a basestation used for a cellular ...
... – Serves as a “hub” for wireless clients. – Bridge between wired and wireless LANs. – Similar to a basestation used for a cellular ...
Chapter 14 - William Stallings, Data and Computer Communications
... available for mobile radio telephone service Prior to cellular radio: ...
... available for mobile radio telephone service Prior to cellular radio: ...
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... All specifications are subject to change without notice due to continuous development. MD65X, X=0, 2, 5,6 or 8, model number varies geographically. For details, please contact our regional ...
... All specifications are subject to change without notice due to continuous development. MD65X, X=0, 2, 5,6 or 8, model number varies geographically. For details, please contact our regional ...
module_30
... – Propagation velocity varies with frequency – Called also “Intersymbol Interference”. Due to delay distortions, some of the signal components of one bit position will spill over into other bit positions. ...
... – Propagation velocity varies with frequency – Called also “Intersymbol Interference”. Due to delay distortions, some of the signal components of one bit position will spill over into other bit positions. ...
EEL 5718 Computer Communications
... • Nonreturn to zero inverted on ones • Constant voltage pulse for duration of bit • Data encoded as presence or absence of signal transition at beginning of bit time • 1: Transition (low to high or high to low) ...
... • Nonreturn to zero inverted on ones • Constant voltage pulse for duration of bit • Data encoded as presence or absence of signal transition at beginning of bit time • 1: Transition (low to high or high to low) ...
Physical Layer
... • Nonreturn to zero inverted on ones • Constant voltage pulse for duration of bit • Data encoded as presence or absence of signal transition at beginning of bit time • 1: Transition (low to high or high to low) ...
... • Nonreturn to zero inverted on ones • Constant voltage pulse for duration of bit • Data encoded as presence or absence of signal transition at beginning of bit time • 1: Transition (low to high or high to low) ...
Chapter6 - UTK-EECS
... • Nonreturn to zero inverted on ones • Constant voltage pulse for duration of bit • Data encoded as presence or absence of signal transition at beginning of bit time • 1: Transition (low to high or high to low) ...
... • Nonreturn to zero inverted on ones • Constant voltage pulse for duration of bit • Data encoded as presence or absence of signal transition at beginning of bit time • 1: Transition (low to high or high to low) ...
Bandwidth
... free space), coaxial cable, fiber optic, waveguide, etc. The signal undergoes some amount of degradation from noise, interference and distortion Receiver: The receiver’s function is to extract the desired signal from the received signal at the channel output and to convert it to a form suitable for ...
... free space), coaxial cable, fiber optic, waveguide, etc. The signal undergoes some amount of degradation from noise, interference and distortion Receiver: The receiver’s function is to extract the desired signal from the received signal at the channel output and to convert it to a form suitable for ...
ATSC tuner
An ATSC (Advanced Television Systems Committee) tuner, often called an ATSC receiver or HDTV tuner is a type of television tuner that allows reception of digital television (DTV) television channels transmitted by television stations in North America, parts of Central America and South Korea that use ATSC standards. Such tuners may be integrated into a television set, VCR, digital video recorder (DVR), or set-top box that provides audio/video output connectors of various types.Another type of television tuner is a digital television adapter (DTA) with an analog passthrough.