CMI - Ch11
Terms
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- This type of signal produces a continous and infinitely-deatailed waveform.
- Analog Signal
- In actuality this is not a wave but a collection of discrete data used to describe an analog wave in a form the computer can understand.
- Digital Audio Signal
- This wave property indicates how many wave cycles are completed per second.
- Frequency
- This is considered the normal frequency range of human hearing.
- 20 Hz to 20,000 KHz
- Using an analog-to-digital convertor to sample a sound wave offers the manipulation of these two parameters.
- Sampling rate and Quantization
- This is the term for how many samples are taken per second.
- Sample Rate
- The ________ the sample rate, the more completely the analog wave's shape can be represented digitally.
- Higher
- This rule states that in order to faithfully describe the basic characteristics of an analog wave the wave must besampled at a rate that is at least twice that of the highest frequency being recorded.
- Nyquist Theorem
-
True or False
The CD sampling rate is higher than that actually required to digitally reproduce the high pitch tones audible to humans. -
False
It is higher because it allows digital audio to replicate some of the saturation of analog tape. - The Nyquist Therem states that as the highest frequency being captured increases, the sample rate used should also increase proportionally. Select the mathematical relationship demonstrated by the Nyquist Theorem.
- Direct Proportion
- This lower quality sample rate captures most of the sound frequencies audible to humans, generate less digital data, and requires less memory than sample rates that capture the full range of frequencies audible to humans.
- Broadcast quality 32 KHz
- What is the highest recorded frequency recorded when recording CD quality. (CD quality has a sample rate of 44,100 Hz)
- 22,050 Hz or 22.05 KHz
- What is the sample rate of Professional quality. (Professional quality's highest recorded frequency is 24,000)
- 48,000 Hz or 48 Khz
- What is the highest recorded frequency recorded when recording DVD quality. (DVD quality has a sample rate of 96 KHz)
- 48 KHz of 48,000 Hz
- What is the sample rate of Broadcast quality. (Broadcast quality's highest recorded frequency is 16 Khz)
- 32 KHz or 32,000 Hz