ssrs 2016 barcode Noise weighting in Software

Generate QR in Software Noise weighting

9.6.6 Noise weighting
Recognizing QR In None
Using Barcode Control SDK for Software Control to generate, create, read, scan barcode image in Software applications.
Draw Denso QR Bar Code In None
Using Barcode maker for Software Control to generate, create QR Code 2d barcode image in Software applications.
Another factor that generally improves the postdetection signal-to-noise ratio is referred to as noise weighting. This is the way in which the flatnoise spectrum has to be modified to take into account the frequency response of the output device and the subjective effect of noise as perceived by the observer. For example, human hearing is less sensitive to a given noise power density at low and high audio frequencies than at the middle frequency range.
QR Code ISO/IEC18004 Reader In None
Using Barcode recognizer for Software Control to read, scan read, scan image in Software applications.
Encoding QR Code In C#.NET
Using Barcode encoder for .NET framework Control to generate, create QR image in VS .NET applications.
Analog Signals
QR Code 2d Barcode Drawer In VS .NET
Using Barcode generator for ASP.NET Control to generate, create QR Code ISO/IEC18004 image in ASP.NET applications.
Create QR Code ISO/IEC18004 In .NET
Using Barcode printer for VS .NET Control to generate, create QR Code JIS X 0510 image in Visual Studio .NET applications.
Figure 9.13 (a and b) Effect of preemphasis on the modulating signal frequency response at the transmitter. (c and d) Effect of deemphasis on the modulating signal and noise at the receiver output. The deemphasis cancels out the preemphasis for the signal while attenuating the noise at the receiver.
Denso QR Bar Code Generator In Visual Basic .NET
Using Barcode printer for VS .NET Control to generate, create Quick Response Code image in .NET framework applications.
Generating Code 39 Full ASCII In None
Using Barcode generation for Software Control to generate, create Code 3/9 image in Software applications.
Weighting curves have been established for various telephone handsets in use by different telephone administrations. One of these, the CCIR curve, is referred to as the psophometric weighting curve. When this is applied to the flat-noise density spectrum, the noise power is reduced by 2.5 dB for a 3.1-kHz bandwidth (300 3400 Hz) compared with flat noise over the same bandwidth. The weighting improvement factor is denoted by [W], and hence for the CCIR curve [W] 2.5 dB. (Do not confuse the symbol W used here with that used for bandwidth earlier.) For a bandwidth of b kHz, a simple adjustment gives [W] 2.5 2.41 10 log [b] b 3.1
Draw Bar Code In None
Using Barcode creation for Software Control to generate, create bar code image in Software applications.
Creating Code 128C In None
Using Barcode generation for Software Control to generate, create Code-128 image in Software applications.
(9.14)
USS-128 Encoder In None
Using Barcode generation for Software Control to generate, create UCC - 12 image in Software applications.
EAN-13 Supplement 5 Drawer In None
Using Barcode encoder for Software Control to generate, create GTIN - 13 image in Software applications.
Nine
UCC - 12 Encoder In None
Using Barcode printer for Software Control to generate, create Universal Product Code version E image in Software applications.
Encode Data Matrix In Java
Using Barcode creation for BIRT reports Control to generate, create Data Matrix image in BIRT reports applications.
Here, b is the numerical value of kHz (a dimensionless number). A noise weighting factor also can be applied to TV viewing. The CCIR weighting factors are 11.7 dB for 525-line TV and 11.2 dB for 625-line TV. Taking weighting into account, Eq. (9.13) becomes c S d N c C d N [GP] [P] [W] (9.15)
ECC200 Maker In .NET Framework
Using Barcode drawer for Visual Studio .NET Control to generate, create DataMatrix image in Visual Studio .NET applications.
UCC-128 Creator In Java
Using Barcode encoder for Java Control to generate, create UCC - 12 image in Java applications.
9.6.7 S/N and bandwidth for FDM/FM telephony
Scan Barcode In Java
Using Barcode recognizer for Java Control to read, scan read, scan image in Java applications.
Data Matrix Drawer In Objective-C
Using Barcode generator for iPhone Control to generate, create Data Matrix image in iPhone applications.
In the case of FDM/FM, the receiver processing gain, excluding emphasis and noise weighting, is given by (Miya, 1981, and Halliwell, 1974)
Drawing UPC A In Java
Using Barcode drawer for Java Control to generate, create UPC-A image in Java applications.
Bar Code Generator In None
Using Barcode encoder for Office Word Control to generate, create barcode image in Microsoft Word applications.
BIF Frms GP 5 b fm
(9.16)
Here, fm is a specified baseband frequency in the channel of interest, at which GP is to be evaluated. For example, fm may be the center frequency of a given channel, or it may be the top frequency of the baseband signal. The channel bandwidth is b (usually 3.1 kHz), and Frms is the root-meansquare deviation per channel of the signal. The rms deviation is determined under specified test tone conditions, details of which will be found in CCIR Recommendation 404-2 (1982). Some values are shown in Table 9.1. Because Frms is determined for a test tone modulation, the peak deviation for the FDM waveform has to take into account the waveform shape through a factor g. This is a voltage ratio that is usually expressed in decibels. For a small number of channels, g may be as high as 18.6 dB (Ffthenakis, 1984), and typical values range from 10 to 13 dB. For the number of channels n greater than 24, the value of 10 dB is often
TABLE 9.1
FDM/FM RMS Deviations RMS deviations per channel (kHz) 35 35 50, 100, 200 50, 100, 200 200 200 200 140, 200 140 140
Maximum number of channels 12 24 60 120 300 600 960 1260 1800 2700
Analog Signals
used. Denoting the decibel value as gdB, then the voltage ratio is obtained from g 5 10
(9.17)
The peak deviation also will depend on the number of channels, and this is taken into account through use of a loading factor, L. The relevant CCITT formulas are For n For 12 240: 20logL n 15 10logn 1 4logn (9.18) (9.19)
240: 20logL
Once L and g are found, the required peak deviation is obtained from the tabulated rms deviation as F g#L# Frms (9.20)
The required IF bandwidth can now be found using Carson s rule, Eq. (9.1), and the processing gain from Eq. (9.16). The following example illustrates the procedure.
Example 9.5
The carrier-to-noise ratio at the input to the demodulator of an FDM/FM receiver is 25 dB. Calculate the signal-to-noise ratio for the top channel in a 24-channel FDM baseband signal, evaluated under test conditions for which Table 9.1 applies. The emphasis improvement is 4 dB, noise weighting improvement is 2.5 dB, and the peak/rms factor is 13.57 dB. The audio channel bandwidth may be taken as 3.1 kHz. [C/N] Given data: n 25 24; gdB 13.57; b 3.1 kHz; [P] 4; [W] 2.5;
Copyright © OnBarcode.com . All rights reserved.