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Jul 30, 2012 · Let us say, if we're creating an e-library website. ... Convert a PDF document into thumbnail image with specified dimensions in C# and VB. ... Let's convert a cover page from a PDF into thumbnail PNG image with size of 100 x ... The devices that accomplish speech analysis (digitization) are called codecs (for coder/decoder) Coders include analog-to-digital (A/D) converters that typically perform a digitization function, and analysis modules that further process the speech to reduce its data rate and prepare it for transmission The reverse process uses synthesis modules to decode the signal and D/A converters that reconvert the signal back to analog format Naturally, the goal of the entire digitizing process is to derive from an analog waveform a digital waveform that is a faithful facsimile (at the acoustical perception level) of the original speech The Sampling Theorem indicates that if the digital waveform is to represent the analog waveform in useful form, the sampling rate must be at least twice the highest frequency present in the analog signal Waveform-coding methods are driven by this theorem Toward that end, analog telephonic speech is filtered before digitization to remove higher frequencies The human speech spectrum contains frequencies beyond 12,000 Hz, but for telephony applications, higher frequencies can be safely filtered out Specifically, in traditional telephone networks, the channel bank and digital loop carrier equipment is designed to eliminate frequencies above 33 kHz20 Consequently, analog speech signals are sampled at 8,000 Hz for PCM applications PCM, as specified in the ITU-T Recommendation G711, is currently the most often used digitization in telephony; today, nearly every wireline telephone call in the United States is digitized at some point along the way using PCM As noted, sampling used in the waveform coding of voice makes an analog waveform discrete in time; quantizing makes the signal discrete in amplitude This discreteness is a direct consequence of the fact that computers are digital devices, where the values that are allowed for variables are discrete The digitization process measures the analog signal at each sample time and produces a digital binary code value representing the instantaneous amplitude Optimizing speech quality involves the production of a digital waveform that can be reconverted to analog with as small an error as possible Quantization is the process that maps a continuum of amplitudes into a finite number of discrete values This results in a (small) loss of information and the ensuing introduction of noise called quantization noise or quantization error In waveform coding, this loss of information is small and the results are called nearly lossless; vocoding methods discard much more information and are therefore called lossy The SNR expressed in decibels (dB) is a measure used to describe voice quality For telephony application, speech coders are designed to have an SNR above 30 dB over most of its range PCM can reproduce any signal to any desired level of quality and has applications beyond telephony For example, the introduction of the CD in. how to create a thumbnail image of a pdf in c#: The C# PDF Library | Iron PDF c# get thumbnail of pdf how to convert the first page of pdf to thumbnail image - MSDN ...
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