1. MP3 (formally MPEG-1 Audio Layer III or MPEG-2 Audio Layer III) is an audio coding format for __________ audio
2. A "real" sound that we hear every day (like the sound of your friend's voice) is _____________
3. If a sound has to be handled by a computer any sound source has to be converted to ____________________
4. What is the difference between analogue and digital recorded sounds?
5. Digitising' the sound (making it digital) by using an input device connected to your computer is called:
6. One device that is involved in capturing analogue sound and converting it into a digital file for use by a PC is a:
7. An input device senses incoming sound, it converts the sound into an electrical signal, and then this signal is ……..
8. A sound card has two jobs. 1. Convert analogue signals to digital for storage and 2…….
9. What are the ADC and DAC?
10. What needs to happen in order to play a sound (via a computer speaker)?
11. Sound is measured in cycles per second or _______________________
12. The higher the frequency (in hertz) the….
13. Tone is one thing, but loudness of sound also matters! Because sound is a ________, the loudness is the ________ of the wave
14. ______________ is a method of converting an analogue sound signal into a set of binary numbers that are stored in digital format.
15. What is the sampling frequency or rate?
16. There is a _________________ at which samples need to be taken in order to faithfully reproduce the original signal
17. For a CD that has sound going up to about 20KHz, the minimum sampling rate is…
18. Getting the sampling rate right is important for capturing…..
19. Another thing that is important to consider in this unit is the ______________
20. The number of bits which are used per sample is called the:
21. Higher bit depth audio will sound …………………..
22. As bit depth and sample rate increase…..
23. Sampling resolution: In the diagram above, a sample can only have _____________ as represented by the 2 bit number
24. In the image below The 11KHz sound sample is far lower quality than the 44 KHz sample, but on the other hand …….
25. Whenever a sound is sampled, you should ensure that the recording system________________otherwise the re-played sound will have some serious distortion.
26. The bit rate is the amount of information required to describe one second of sound. The formula is:
27. To work out the bit rate for one second of audio you would have to:
28. The unit for bit rate is:
29. A CD quality stereo audio recording with two channels would require: Bit rate = 44,100 x 16 ______________
30. The disadvantage of having a very high bit rate is ….
31. You can reduce the bit rate without sacrificing too much quality by using a technique called:
32. To work out the total size of an audio file, you….
33. Complete the formula:
34. Given the followig details, what is the storage requirement?
35. As there are 8 bits to a byte, the storage for an uncompressed 3 minute CD quality recording is:
36. (Most) humans use two ears to hear. A channel is a single sound stream.
37. Mono sound has information about only a single source or single channel
38. _____ sound will have ______ channels, to make use of multiple speakers. Each channel needs its own samples
39. In order for an audio player to play back a sound file, the file needs meta data (extra information) on top of the samples.
40. The longer the sampling lasts the smaller the file will be
41. A bit depth of 8 bits allows 256 levels of the wave to be measured
42. Doubling the bit depth will ______________________________
43. The higher the bit depth, the worse the percieved quality of sound.
44. Bit rate (bits per second) is a product of sample rate, channel compression rate and four times the sample bit depth
45. An uncompressed file format is WAV and a compressed format is a MP3