Representing Sound
Akopọ
Sound is a wave in the air. It never stops changing, it has no edges, and between any two instants there is another instant. A computer has none of those qualities: it stores a finite list of whole numbers and nothing else. So recording sound is not a matter of copying it into a machine. It is a matter of measuring it, over and over, fast enough that the list of measurements can be turned back into something a human ear accepts as the original.
This lesson explains what that measuring process is, what the two settings that control it actually do, and how to calculate the size of the file that results. You will learn why a recording made at a higher sampling rate sounds better and costs more, what a sample resolution of 8 bits gets you that 4 bits does not, and how to run the file size formula backwards to find a missing setting.
Awọn Afojusun
- Understand that sound is analogue and that it must be converted to a digital form for storage and processing in a computer. Understand that sound waves are sampled to create the digital version of sound. Describe the digital representation of sound in terms of:
- sampling rate
- sample resolution.
- Calculate sound file sizes based on the sampling rate and the sample resolution.
Àwòrán ọpọlọ
A ti ṣe àwòrán kókó yìí kí o lè rí bí àwọn èrò ṣe so pọ̀.
Ṣí àwòrán ọpọlọ nínú áàpù
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Gba ohun èlò Green Bridge CBT sórí fóònù tàbí kọ̀mpútà rẹ fún gbogbo ilé ìkàwé IGCSE: ìwé ìdánwò àtijọ́, ìlànà ìdíwọ̀n, àwòrán èrò, káàdì ìkẹ́kọ̀ọ́ àti ẹ̀kọ́ ohùn.
Ìdánwò Ẹ̀kọ́
Oriire fun ipari ẹkọ lori Representing Sound. Ni bayi ti o ti ṣawari naa awọn imọran bọtini ati awọn imọran, o to akoko lati fi imọ rẹ si idanwo. Ẹka yii nfunni ni ọpọlọpọ awọn adaṣe awọn ibeere ti a ṣe lati fun oye rẹ lokun ati ṣe iranlọwọ fun ọ lati ṣe iwọn oye ohun elo naa.
Iwọ yoo pade adalu awọn iru ibeere, pẹlu awọn ibeere olumulo pupọ, awọn ibeere idahun kukuru, ati awọn ibeere iwe kikọ. Gbogbo ibeere kọọkan ni a ṣe pẹlu iṣaro lati ṣe ayẹwo awọn ẹya oriṣiriṣi ti imọ rẹ ati awọn ogbon ironu pataki.
Lo ise abala yii gege bi anfaani lati mu oye re lori koko-ọrọ naa lagbara ati lati ṣe idanimọ eyikeyi agbegbe ti o le nilo afikun ikẹkọ. Maṣe jẹ ki awọn italaya eyikeyi ti o ba pade da ọ lójú; dipo, wo wọn gẹgẹ bi awọn anfaani fun idagbasoke ati ilọsiwaju.
- What does a single sample of a sound record? A. The amplitude of the wave at a point in time B. The number of bits in the file C. The length of the recording D. The number of samples taken per second Answer: A
- A recording has a sampling rate of 16,000 Hz. What does this mean? A. Each sample uses 16,000 bits B. 16,000 samples are taken every second C. The recording lasts 16,000 seconds D. The file is 16,000 bytes Answer: B
- A 4 second recording uses a sampling rate of 10,000 Hz and a sample resolution of 8 bits. What is the file size in bits? A. 40,000 B. 80,000 C. 320,000 D. 640,000 Answer: C
- A sample resolution of 8 bits allows how many different amplitude levels? A. 8 B. 16 C. 64 D. 256 Answer: D
- A recording is remade with the sampling rate doubled and everything else unchanged. What happens to the file size? A. It halves B. It stays the same C. It doubles D. It quadruples Answer: C
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Ṣe o fẹ ṣe adaṣe awọn ibeere idanwo adaṣe nipa Representing Sound? Ṣe igbasilẹ ohun elo Green Bridge CBT lati wọle si awọn ibeere idanwo adaṣe ati awọn ayẹwo adaṣe kikun fun koko-ọrọ yii.
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