how to convert speech into digital signals
Hi,
To convert speech signal into binary, perform the steps - SAMPLING, QUANTIZING AND ENCODING.
Step 1: Sample the signal according to sampling theorem i.e., use a sampling frequency greater than the highest freq. component of the message signal.In u'r case, the highest freq. component of speech signal is 3.3KHz and hence the sampling freq.should be 8KHz(World wide standard).The sampling process converts continous time signal into discrete time signal.
Step 2: Using a µ - law compandor, compress the speech samples and then Quantize using a uniform quantizer. The quantization process converts continous amplitude samples into discrete amplitudes.In u'r case, use 256 quantization levels to quantize the speech signal.
Step 3: For the encoding process, assign code numbers from 0 to 255 to the quantization levels. The Binary data is generated as per the code no. Since we have used 256 levels, each sample is encoded into 8 bits.The SNR would be approximately 50dB.
Hope this info.would be useful to u.
Regards
Bhanumurthy