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how to add watermark (text or image) in existing pdf in c#.I want the ... Add+watermark+to+pdf+file+created+at+run+time+using+itextsharp. Encoder/Decoder The G7231 coder is designed to operate with a digital signal by first performing telephone bandwidth filtering (ITU-T Recommendation G712) of the analog input, sampling at 8,000 Hz, and then converting to 16-bit linear PCM for the input to the encoder The output of the decoder is converted back to analog by similar means Other input/output characteristics, such as those specified by ITU-T Recommendation G711 or 4-Kbps PCM data, should be converted to 16-bit linear PCM before encoding or from 16-bit linear PCM to the appropriate format after decoding The coder is based on the principles of LPAS coding and attempts to minimize a perceptually weighted error signal The encoder operates on blocks (frames) of 240 samples each That is equal to 30 ms at an 8-kHz sampling rate Each block is first high-pass filtered to remove the DC component and then divided into four subframes of 60 samples each For every subframe, a tenth-order LPC filter is computed using the unprocessed input signal The LPC filter for the last subframe is quantized using a predictive split vector quantizer (PSVQ) The quantized LPC coefficients are used to construct the ST perceptual weighting filter, which is used to filter the entire frame and obtain the perceptually weighted speech signal105 For every two subframes (120 samples), the open-loop pitch period, LLO, is computed using the weighted speech signal This pitch estimation is performed on blocks of 120 samples The pitch period is searched in the range from 18 to 142 samples From this point, the speech is processed on a 60 samples per subframe basis Using the estimated pitch period computed previously, a harmonic noiseshaping filter is constructed A combination of the LPC synthesis filter, the format perceptual weighting filter, and the harmonic noise-shaping filter is used to create an impulse response The impulse response is then used for further computations Using the estimated pitch period estimation LLO and the impulse response, a closed-loop pitch predictor is computed A fifth-order pitch predictor is used The pitch period is computed as a small differential value around the open-loop pitch estimate The contribution of the pitch predictor is then subtracted from the initial target vector Both the pitch period and the differential values are transmitted to the decoder Finally, the nonperiodic component of the excitation is approximated For the high bit rate, MP-MLQ excitation is used, and for the low bit rate, an algebraic code excitation is used. add watermark to pdf using itextsharp c#: How to add watermark to pdf document ( c# sample) - Apitron add watermark to pdf using itextsharp c# Windows 8 How to Watermark PDF in C# sample in C# for Visual ...
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