Technologies for Packet-Based Voice Applications in C#.NET

Scan PDF417 in C#.NET Technologies for Packet-Based Voice Applications

Technologies for Packet-Based Voice Applications
Decoding PDF 417 In Visual C#
Using Barcode recognizer for .NET Control to read, scan PDF 417 image in Visual Studio .NET applications.
www.OnBarcode.com
Decoding PDF-417 2d Barcode In Visual C#.NET
Using Barcode recognizer for Visual Studio .NET Control to read, scan read, scan image in .NET framework applications.
www.OnBarcode.com
the quantizer scale factor adaptation, and the adaptation speed control blocks Inverse Adaptive Quantizer The inverse quantizer uses the core bits to compute a quantized version dq(k) of the difference signal using the scale factor y(k) and the tables alluded to previously, and taking the antilog to the base 2 of the result The estimated difference se(k) is added to dq(k) to reproduce the reconstructed version sI(k) of the input signal The tables alluded to previously are applicable only when there are specific bits in the feedforward path Quantizer Scale Factor Adaptation This block computes y(k), the scaling factor for the quantizer and inverse quantizer (The scaling factor y(k) is also fed to the adaptation speed control block) The inputs are the bitmasked output Ic(k) and the adaptation speed control parameter a1(k) The basic principle used in scaling the quantizer is bimodal adaptation, which is
Barcode Recognizer In C#.NET
Using Barcode reader for VS .NET Control to read, scan bar code image in .NET applications.
www.OnBarcode.com
Recognize Barcode In C#.NET
Using Barcode reader for .NET Control to read, scan read, scan image in .NET framework applications.
www.OnBarcode.com
Fast for signals (such as speech) that produce difference signals with large fluctuations Slow for signals (such as voiceband data and tones) that produce difference signals with small fluctuations
Scanning PDF-417 2d Barcode In C#.NET
Using Barcode recognizer for .NET framework Control to read, scan PDF417 image in .NET framework applications.
www.OnBarcode.com
PDF 417 Recognizer In VS .NET
Using Barcode decoder for ASP.NET Control to read, scan PDF417 image in ASP.NET applications.
www.OnBarcode.com
The speed of adaptation is controlled by a combination of fast and slow scale factors The fast (unlocked) scale factor yu(k) is recursively computed in the base 2 logarithmic domain from the resultant logarithmic scale factor y(k) (u stands for unlocked): yu 1k2 where 106 yu 1k2 1000 11 2 5 2y1k2 2 5W3Ic 1k2 4
PDF 417 Recognizer In Visual Studio .NET
Using Barcode decoder for Visual Studio .NET Control to read, scan PDF 417 image in Visual Studio .NET applications.
www.OnBarcode.com
PDF417 Reader In Visual Basic .NET
Using Barcode decoder for Visual Studio .NET Control to read, scan PDF 417 image in .NET framework applications.
www.OnBarcode.com
The discrete function W[Ic(k)] is defined in tables included in the standard The factor (1 2 -5) introduces finite memory into the adaptive process so that the states of the encoder and decoder converge following transmission errors The slow (locked) scale factor yl(k) is derived from yu(k) with a low-pass filter operation (l stands for locked): yl 1k2 11 2 6 2yl 1k 12 26yu 1k2
Linear Reader In Visual C#.NET
Using Barcode decoder for .NET framework Control to read, scan Linear Barcode image in .NET applications.
www.OnBarcode.com
Read DataMatrix In Visual C#.NET
Using Barcode recognizer for Visual Studio .NET Control to read, scan DataMatrix image in VS .NET applications.
www.OnBarcode.com
2
Scanning PDF417 In Visual C#.NET
Using Barcode recognizer for .NET Control to read, scan PDF 417 image in .NET applications.
www.OnBarcode.com
Scanning Code-128 In C#.NET
Using Barcode reader for VS .NET Control to read, scan Code 128B image in .NET framework applications.
www.OnBarcode.com
The fast and slow scale factors are then combined to form the resultant scale for y1k2 where 0 a1 1k2 1 a1 1k2yu 1k 12 31 a1 1k2 4yl 1k 12
Decode Ames Code In Visual C#
Using Barcode decoder for VS .NET Control to read, scan Code 2 of 7 image in VS .NET applications.
www.OnBarcode.com
USS-128 Decoder In Objective-C
Using Barcode decoder for iPad Control to read, scan EAN / UCC - 13 image in iPad applications.
www.OnBarcode.com
Adaptation Speed Control The controlling parameter al(k) can assume values in the range [0,1] It tends toward unity for speech signals and toward zero for voiceband data signals It is derived from a measure of the rate of change of the difference signal values Two measures of the average magnitude of Ic(k) are computed (s stands for short and l stands for long): dms 1k2 and dml 1k2 11 2 7 2dml 1k 12 2 7F3Ic 1k 12 4 11 2 5 2dms 1k 12 2 5F3Ic 1k 12 4
Decode QR Code In None
Using Barcode recognizer for Excel Control to read, scan QR Code image in Office Excel applications.
www.OnBarcode.com
PDF417 Decoder In None
Using Barcode reader for Microsoft Excel Control to read, scan PDF 417 image in Office Excel applications.
www.OnBarcode.com
where F[(Ic(k)] is defined as
Decoding EAN13 In None
Using Barcode recognizer for Online Control to read, scan UPC - 13 image in Online applications.
www.OnBarcode.com
Scan Data Matrix In None
Using Barcode recognizer for Software Control to read, scan read, scan image in Software applications.
www.OnBarcode.com
[Ic(k)] F[Ic(k)] 1 7 0 0
Barcode Recognizer In None
Using Barcode reader for Microsoft Excel Control to read, scan bar code image in Excel applications.
www.OnBarcode.com
Recognizing QR Code JIS X 0510 In .NET Framework
Using Barcode reader for .NET framework Control to read, scan read, scan image in VS .NET applications.
www.OnBarcode.com
for a 2-core-bit (1 sign bit) operation, or
[Ic(k)] F[Ic(k)] 3 7 2 2 1 1 0 0
for 3-core-bit (1 sign bit) operation, or
[Ic(k)] F[Ic(k)] 7 7 6 3 5 1 4 1 3 1 2 0 1 0 0 0
for a 4-core-bit (1 sign bit) operation Thus, dms(k) is a relatively short-term average of F[Ic(k)], and dml(k) is a relatively long-term average of F[Ic(k)]
Technologies for Packet-Based Voice Applications
Using these two averages, the variable ap(k) is defined: 11 ap 1k2 11 2 4 1ap 1k 2 4 2ap 1k 2 4 2ap 1k 12 12 12 2 2 2
3 3 3
dml 1k2 0 1 1 2 3dml 1k2
if 0 dms 1k2 if y1k2 6 3 if td 1k2 if tr 1k2
11
1 11
2 4 2ap 1k
12 otherwise
Thus, ap(k) tends toward the value 2 if the difference between dms(k) and dml(k) is large (the average magnitude Ic(k) is changing) for an idle channel (indicated by y(k) 3) or for partial-band signals (indicated by td(k) 1, as described in the following section) The value of ap(k) tends toward the value 0 if the difference is small (the average magnitude of Ic(k) is relatively constant) Note that ap(k) is set to 1 upon detection of a partial-band signal transition (indicated by tr(k) 1) ap(k 1) is then limited to yield a1(k) used in other portions of the specification a1 1k2
Copyright © OnBarcode.com . All rights reserved.