assignment project 2 digital recording

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School

Montclair State University *

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SPEECH

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Electrical Engineering

Date

Apr 3, 2024

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doc

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Uploaded by jonesjones39

Project 2 Assignment – Upload to Canvas (100 points) 1. Sample rate Describe the sound quality and report the file size for the 44100 Hz recording, saved as a wav file. (8 points) The sound quality was better and sounded clearer than when I recorded initially and the file size was 1.2 MB. Describe the sound quality and report the file size for the 16000 Hz recording, saved as a wav file. (8 points) The sound quality was not as clear as it was at 44100 Hz, but it was still pretty clear. File size was 901 KB. Describe the sound quality and report the file size for the 8000 Hz recording, saved as a wav file. (8 points) This sounded very muffled and not as clear, but still able to understand. The size was 211 KB. Describe the sound quality and report the file size for the 4000 Hz recording, saved as a wav file. (8 points) This sound was even more muffled and seemed quieter than the rest. The file size was 102 KB. Describe the sound quality and report the file size for the 1000 Hz recording, saved as a wav file. (8 points) This recording was like listening to static on the radio and was so quiet. The file size was 28 KB. 2. Waveforms for Speech Sounds Make sure these phonemes are recorded at 44100 Hz. Describe the visual appearance of the phoneme /a/. (8 points)

This waveform appeared to have a very steady and consistently same amplitude throughout and a bit lower frequency throughout the sound. Seemed more periodic than the other sounds and had the same sort of wavelengths throughout. Describe the visual appearance of the phoneme /i/. (8 points) This sound appeared to have similar wavelengths of the /a/ sound with similar frequencies and amplitudes. Amplitudes were a tad bit lower. This waveform looked less complex compared to the others and had more pure tones or wavelengths that were more similar and consistant. Describe the visual appearance of the phoneme /s/. (8 points) This was all over the place. It looked like there were lower amplitudes in some spots and higher in others. It was very inconsistent. Frequencies were higher at some points and lower at others. Overall, before zooming in it looks like frequencies were much higher compared to others. Describe the visual appearance of the phoneme /z/. (8 points) Complex tone with higher and lower frequencies throughout the waveform. This sound had the highest frequencies with the highest amplitudes compared to the others. Looking at it zoomed out it looked inconsitant like higher then lower parts then higher then lower but in a choppy way. Not many repeating patterns at all each wavelength and cycles were different. Describe the visual appearance of the phoneme /m/. (8 points) This phoneme looked more consistent than the other consonants. It was pretty repetitive and lengths of amplitudes were very similar at the peaks and troughs each time. 3. Audacity Effects Describe what you did with your three miscellaneous effects from the Audacity menu choices. How did the sound change? Could any of these effects be used for something useful, or are they just for fun? (20 points) The first change I used was the echoing effect which just echoed and repeated back what I was saying. I t was very interesting, and I feel like something that is used less in speech, but could be useful more in song effects. I used the reverb and turned the decay time up and it made it sound really cool like as if I were in a tunnel. I feel like I have heard this

used in songs before, but could also be used as voice effects in movies if someone were in a tunnel or a cave. I think one of the more interesting effects that I found was that you are able to change the voice of the speech into a female, male, child, etc. voices. This was very fun and very interesting to do. This could definitely be a little useful in speech when comparing female to male speech and their pitch, amplitude, frequencies, and other components of speech that would differ in each different sound. Similar to the other sounds I think a lot of these sounds are fun, but are more useful than just changing the style of speech and can be used in movies, cartoons, and any kind of music.

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