Audio Notes COMD 3385- Speech Science
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This 3 page Class Notes was uploaded by Ashley Lara on Friday February 13, 2015. The Class Notes belongs to COMD 3385- Speech Science at University of Houston taught by Ferenc Bunta in Winter2015. Since its upload, it has received 202 views. For similar materials see Speech Science in Language at University of Houston.
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Date Created: 02/13/15
Analog signals is continuous And should exist any time Digital does not exist continuously only at discrete points can have gaps in between points only given pieces of it but if there are enough points our ears and brain will not discriminate Digital vs analog Digital is more resistant to noise and degradation Easier to transfer files Two main parts of digitization Sampling and quantization Before these two preemphasis filter boosts higher frequencies and lowpass presampling filter rejects energy above highest frequency of interest Samples Samples are given in different times analog signal is made in discrete in time need twice than samples you would need 50 20000 hz the human ear can hear so need 40000 hz in samples why do we have a sampling rate of about 44000 hz Because human ear can hear about up to 20000 hz lf highest frequency of interest is 50000 what will be needed is 100000 hz Why Because want to avoid aliasing Which is from not sampling enough and lack of lowpass filter and higher frequencies are not being perceived accurately but as fake lower frequencies fAKE typical recommended sampling frequency is 22050 hz Quantization Converts amplitude or energy level of the sample Made into bits 8 bit system 2x2 eights time to reach 256 Most common bit is 16 bit system65536 levels Cd quality is 44hz and 16 bits Radio quality is 22hz and 8 bits Poorer quality is worse No outline of analog to digital map on next test
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