Explain the concepts of sampling and sampling rate then...

Explain the concepts of sampling and sampling rate. Then, listen to this 2 kHz file, this 8 kHz file, and this 44.1 kHz file and compare their sound. Depending on your speakers, you may not notice any difference. Explain the concept of compression and the difference between lossy and lossless compression. Then, compare this 601 kB file and this 33.7 kB file. Was lossy or lossless compression used? How did compression affect the image? Explain the concept of bit depth in audio recordings. Then, listen to this 8-bit recording and this 32-bit recording and compare their quality. Describe the difference between raster and vector images. Then, compare this raster image and this vector image. In both images, the bottom TestOut logo is an enlarged version of the top logo. Describe the concept of image resolution. Then, compare this 94 x 140 image and this 604 x 900 image.

Transcript

00:01 Hello student, first sampling and sampling rate is described.

00:03 Sampling is the process of converting a continuous signal such as audio or video into a discrete digital signal.

00:09 So, sampling rate is the number of the sample taken per second.

00:11 For audio, it is measured in hertz or kilohertz.

00:14 A higher sampling rate captures more detail but requires more storage space and processing power.

00:20 So, now i have to compare the sound files to 8 and 44 .1 kilohertz.

00:27 So, audio file with higher sampling rate generally offer better sound quality and come accurately captures high frequency.

00:35 However, the difference in the sound quality may not be noticeable on all type of a speaker.

00:40 Lower sampling rate here, lower sampling rate 2 kilohertz might lack high frequency details and sound less natural or clear.

00:49 And now the next is i have to describe the compression.

00:52 Compression is a process of reducing the size of a file.

00:54 Lossy compression removes some data, sacrificing quality for smaller size.

00:59 Lossless compression reduces size without any loss of quality.

01:03 So, lossy versus lossless compression.

01:05 Lossy compression reduces the file size by discarding some information common in audio and image formats.

01:11 It can result in reduced quality.

01:14 Lossless compression used in the format like jpeg, flap reduce the file size without sacrificing quality.

01:22 So, no data is lost and the original can be perfectly reconstructed.

01:26 Now i have to compare the image 601 kb versus 33 .7 kb.

01:32 A significant reduction in the file size 601 kb to 33 .7 kb indicate that lossy compression was likely used.

01:45 This kind of compression reduces image quality to achieve smaller file size details.

01:51 So, here we used lossy compression.

01:54 After this bit depth in audio recording.

01:57 Bit depth determines the dynamic range and precision of an audio recording.

02:02 A higher bit rate that is 32 bit allows for greater detail capturing softer and louder sounds with more accuracy compared to the lower bit depth that is 8 bit.

02:11 Comparing audio recording 8 bit versus 32 bits...

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