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SPEECH COMPRESSION AND DECOMPRESSION USING ADPCM TECHNIQUE


Posted by: seminar class
Created at: Saturday 05th of March 2011 12:02:37 AM
Last Edited Or Replied at :Wednesday 06th of April 2011 04:06:03 AM
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nd speakers.
FUNCTIONING
 The speech segment to be compressed is fed as input through MICRO PHONE.
 The analog speech signal is digitized by CODEC, compressed by ADSP-2105 and stored in RAM.
 The decompression process can be started by interrupting the processor.
 When the processor is interrupted, the information in memory is fetched by the processor and decompressed and is then fed to CODEC.
 The CODEC converts the digital signal to analog signal. The analog signal is amplified and output through the speaker
FEATURES
The speech compression and decom..................[:=> Show Contents <=:]



speech compression using GSM RPE-LTP


Posted by: savitha p s
Created at: Friday 25th of February 2011 04:45:06 AM
Last Edited Or Replied at :Friday 25th of February 2011 04:51:46 AM
speech compression ,
ic.
thanking you,





yours faithfully,
savitha ps
8th sem ECE..................[:=> Show Contents <=:]



speech compression by novel method


Posted by: suseela
Created at: Monday 24th of January 2011 01:26:12 AM
Last Edited Or Replied at :Tuesday 25th of January 2011 12:32:00 AM
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can u plzz send me full r..................[:=> Show Contents <=:]



A NOVEL METHOD OF COMPRESSING SPEECH WITH HIGHER BANDWIDTH EFFICIENCY


Posted by: seminar surveyer
Created at: Thursday 07th of October 2010 06:22:59 AM
Last Edited Or Replied at :Thursday 07th of October 2010 06:22:59 AM
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thm to work.

An exact reverse process at the receiver reconstructs the samples. At the receiver, the N-point IDFT of the received signal is performed after necessary zero padding. Zero padding is necessary because at the transmitter of the N samples only N samples are transmitted, but at the receiver N samples are again needed to honestly reconstruct the signal.

Hence this method is efficient as only a portion of the total number of samples is transmitted thereby saving the bandwidth. Since the frequency samples are transmitted the phase information has also to be transmitted. Her..................[:=> Show Contents <=:]



Speech Compression using GSM RPE-LTP full report


Posted by: seminar topics
Created at: Sunday 21st of March 2010 12:04:31 AM
Last Edited Or Replied at :Sunday 27th of March 2011 10:48:13 AM
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ient When the signal changes from voiced to unvoiced, RPE transmits a code that stops the receiver from generating periodic pulses Starts generating random pulses to correspond to the noise like nature of unvoiced
8

GSM Compression Technologies

Four compression technologies are:

Full Rate Enhanced Full Rate (EFR) Adaptive Multi-Rate (AMR) Half Rate
9

GSM Full Rate Vocoder Using RPE-LTP

Described as an RPE-LTP linear predictive coder. Models the human vocal tract as a series of cylinders of different widths. By forcing air through these cylinders, speech sounds ca..................[:=> Show Contents <=:]



f IMAGE COMPRESSION USING BIORTHOGONAL 37 WAVELET TRANSFORMS


Posted by: M.swetha reddy
Created at: Saturday 09th of January 2010 08:51:31 PM
Last Edited Or Replied at :Monday 11th of January 2010 04:55:47 AM
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please send me the complete information on wavelet tra..................[:=> Show Contents <=:]



Speech Compression - a novel method


Posted by: computer science crazy
Created at: Tuesday 07th of April 2009 01:21:25 PM
Last Edited Or Replied at :Friday 09th of September 2011 11:09:24 PM
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sion is achieved. The N samples per packet are subjected to a N-Point DFT. Since low pass signals alone are considered here, the number of significant values in the set of DFT samples is very limited. Transmitting these significant samples alone would suffice for reliable transmission. The number of samples, which are transmitted, is determined by the parameter .

The parameter is almost independent of the source of the speech signal. In other methods of speech compression, the specific characteristics of the source such as pitch are important for the algorithm to work. An exact reverse pro..................[:=> Show Contents <=:]



Speech Compression - a novel method


Posted by: Computer Science Clay
Created at: Sunday 01st of March 2009 02:22:51 AM
Last Edited Or Replied at :Sunday 01st of March 2009 02:22:51 AM
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the spectrum irrespective of the sampling frequency. By this type of transmission we can save the bandwidth required for transmission considerably. Also it is not necessary that we have to transmit all the samples corresponding to the 4 kHz frequency as it is sufficient to transmit a fraction of the samples without any degradation in the quality.

Since the spectrum is considered in the above method both the magnitude and phase information must be transmitted to reproduce the signal without any error. But this requires twice the actual bandwidth. Exploiting the property of real and even sig..................[:=> Show Contents <=:]



Speech Compression - a novel method


Posted by: computer science crazy
Created at: Sunday 21st of September 2008 12:07:13 AM
Last Edited Or Replied at :Sunday 21st of September 2008 12:07:13 AM
method , novel, Compression , Speech,
nformation in the magnitude spectrum have performed a MATLAB simulation performed to determine the optimum value of 'a' and 'N'. The result of the simulation is also provided...................[:=> Show Contents <=:]



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