EXPERIMENTS AND PROGRAM EXAMPLES in .NET

Encoder qrcode in .NET EXPERIMENTS AND PROGRAM EXAMPLES
EXPERIMENTS AND PROGRAM EXAMPLES
QR Code creator on .net
use .net framework denso qr bar code implementation todraw denso qr bar code with .net
Table 10.4 (continued)
Visual Studio .NET qrcode scanner with .net
Using Barcode decoder for .net framework Control to read, scan read, scan image in .net framework applications.
if(temp32b <= L_deposit_h(200)) temp32b = L_deposit_h(200); // Detect speech activity at far end if(dt->farInPowS > temp32b) // temp32b = thresFar { // Declare far-end speech dt->farFlag = 1; // Set hangover time counter dt->farHangCount = HANGOVER_TIME; } else { if (dt->farHangCount-- < 0) // Decrement hangover counter { dt->farFlag = 0; dt->farHangCount = 0; // Hangover counter expired } }
.net Framework bar code reader for .net
Using Barcode recognizer for .net vs 2010 Control to read, scan read, scan image in .net vs 2010 applications.
Procedures of the experiment are listed as follows: 1. Build, load, and run the experiment program. 2. The acoustic echo canceler output is saved in the le named aecout.pcm. 3. Use the CCS graph tool to plot the adaptive lter coef cients, w, of length 512, as shown in Figure 10.28. 4. With the same inputs as shown in Figure 10.27(a) and (b), the processed output by this xed-point acoustic echo canceler is shown in Figure 10.29. Further experiments include writing assembly programs to replace the intrinsics used in this experiment, and modifying the xed-point C code to create an adaptive echo canceler using assembly program.
Bar Code barcode library in .net
use visual studio .net crystal barcode maker toinclude barcode in .net
10.7.4 Experiment of Delay Estimation
VS .NET qr codes generator with visual c#.net
generate, create qr bidimensional barcode none for c# projects
This experiment uses the MATLAB scripts exp10_7_4.m to nd the echo delay based on the crosscorrelation method. The program is listed in Table 10.5. The MATLAB function xcorr(x,y, 'biased') is used to calculate the crosscorrelation between the vectors x and y. In this experiment, we use auco8khz.txt as the far-end data (y vector), delay it by 200 samples, and copy it as the near-end data (x vector). The crosscorrelation between the vectors x and y is returned to crossxy. The MATLAB function max( ) is used to nd the maximum value m in the array, which represents the delay between the far-end and near-end signals. The les used for this experiment are listed in Table 10.6, and procedures of the experiment are listed as follows: 1. Running the script, the delay value is estimated and printed as The maximum corssXY(m). This simple technique works well for estimating a pure delay in noise-free environment. 2. In real applications with noises and multiple echoes, more complicated methods discussed in Section 10.3.2 are needed. The crosscorrelation function is shown in Figure 10.30.
Display qr code jis x 0510 for .net
using web form toassign qr in asp.net web,windows application
Adaptive lter coef cients in steady state
Embed qr code jis x 0510 with vb
generate, create qr code 2d barcode none in vb.net projects
104 2 Amplitude
3 Of 9 printer on .net
using barcode integrated for .net vs 2010 control to generate, create bar code 39 image in .net vs 2010 applications.
Output of fixed-point AEC
Include bar code with .net
using vs .net crystal todisplay barcode for asp.net web,windows application
2 0 1 2 Time
ANSI/AIM Code 128 encoding in .net
using visual .net topaint code128 for asp.net web,windows application
Figure 10.29 Table 10.5 The error signal of xed-point AEC output
Qr Barcode barcode library for .net
use visual studio .net denso qr bar code development toconnect denso qr bar code for .net
5 104
USPS Confirm Service Barcode printer for .net
use visual .net postal alpha numeric encoding technique development toadd usps confirm service barcode on .net
Crosscorrelation method for estimating the delay
Generate pdf417 for excel spreadsheets
using barcode integration for excel spreadsheets control to generate, create pdf417 2d barcode image in excel spreadsheets applications.
% Open data files fid1 = fopen('.//data//rtfar.pcm', 'rb'); fid2 = fopen('.//data//rtmic.pcm', 'rb'); % Read data files x = fread(fid1, 'int16'); y = fread(fid2, 'int16'); % crossxy(m) = cxy(m-N), m=1, ..., 2N-1 crossxy = xcorr(x(1:800),y(1:800),'biased'); len=size(crossxy); % Only half = cxy(m-N), m=1, ...
Control ansi/aim code 39 size with .net
to print code 39 extended and 3 of 9 barcode data, size, image with .net barcode sdk
Table 10.5 xy = abs(crossxy(((len-1)/2+1):len)); % Find max in xy [ampxy,posxy]=max(xy);
Code128b development on office excel
use office excel barcode 128 printing tomake uss code 128 with office excel
(continued)
Control code128b size with .net
barcode 128 size on .net
plot(xy),; title('Crosscorelation between x and y'); xlabel('Time at 8000 Hz sampling rate'); ylabel('Crosscorrelation'); text(posxy-1,ampxy,... '\bullet\leftarrow\fontname{times} CorossXY(m) = MAXIMUM', 'FontSize',12) disp(sprintf('The maximum corssXY(m) found at %d with value =%d \n', posxy-1,ampxy)); fclose(fid1); fclose(fid2);
Code128 barcode library with .net
generate, create code 128 code set a none for .net projects
Table 10.6 Files
Control qr barcode size with .net
to connect qr barcode and qr barcode data, size, image with .net barcode sdk
File listing for experiment exp10.7.4_delayDetect Description MATLAB experiment program Data le for far-end signal Data le for near-end signal
USS Code 39 barcode library in visual basic.net
generate, create barcode code39 none in visual basic.net projects
delayDetect.m rtfar.pcm rtmic.pcm
Deploy data matrix barcode for .net
generate, create gs1 datamatrix barcode none in .net projects
Crosscorrelation between x and y 2500 CrossXY(m) = MAXIMUM 2000
Crosscorrelation
300 400 500 Time at 8000 Hz sampling rate
Crosscorrelation function to nd a at delay
ADAPTIVE ECHO CANCELATION
References
[1] S. M. Kuo and D. R. Morgan, Active Noise Control Systems Algorithms and DSP Implementations, New York: John Wiley & Sons, Inc., 1996. [2] W. Tian and A. Alvarez, Echo canceller and method of canceling echo, World Intellectual Property Organization, Patent WO 02/093774 A1, Nov. 2002. [3] W. Tian and Y. Lu, System and method for comfort noise generation, US Patent no. 6 766 020 B1, July 2004. [4] Y. Lu, R. Fowler, W. Tian, and L. Thompson, Enhancing echo cancellation via estimation of delay, IEEE Trans. Signal. Process., vol. 53, no. 11, pp. 4159 4168, Nov. 2005. [5] D. L. Duttweiler, A twelve-channel digital echo canceller, IEEE Trans. Comm., vol. COM-26, pp. 647 653, May 1978. [6] D. L. Duttweiler and Y. S. Chen, A single-chip VLSI echo canceller, Bell Sys. Tech. J., vol. 59, pp. 149 160, Feb. 1980. [7] K. Eneman and M. Moonen, Filterbank constrains for subband and frequency-domain adaptive lters, Proc. IEEE ASSP Workshop, New Paltz, NY: Mohonk Mountain House, Oct. 1997. [8] Math Works, Inc.,Using MATLAB, Version 6, 2000. [9] Math Works, Inc.,MATLAB Reference Guide, 1992. [10] Analog Devices, Digital Signal Processing Applications Using the ADSP-2100 Family, Englewood Cliffs, NJ: Prentice Hall, 1990. [11] C. W. K. Gritton and D. W. Lin, Echo cancellation algorithms IEEE ASSP Mag., pp. 30 38, Apr. 1984. [12] CCITT Recommendation G.165, Echo Cancellers, 1984. [13] M. M. Sondhi and D. A. Berkley, Silencing echoes on the telephone network, Proc. IEEE, vol. 68, pp. 948 963, Aug. 1980. [14] M. M. Sondhi and W. Kellermann, Adaptive echo cancellation for speech signals, in Advances in Speech Signal Processing, S. Furui and M. Sondhi, Eds., New York: Marcel Dekker, 1992, Chap. 11. [15] Texas Instruments, Inc., Acoustic Echo Cancellation Software for Hands-Free Wireless Systems, Literature no. SPRA162, 1997 [16] Texas Instruments, Inc., Echo Cancellation S/W for TMS320C54x, Literature no. BPRA054, 1997 [17] Texas Instruments, Inc., Implementing a Line-Echo Canceller Using Block Update & NLMS Algorithms- C54x, Literature no. SPRA188, 1997 [18] ITU-T Recommendation G.167, Acoustic Echo Controllers, Mar. 1993. [19] ITU-T Recommendation G.168, Digital Network Echo Cancellers, 2000.