Representing Audio Flashcards
Transducer refers to what?
microphone
A Transducer converts sound waves to what?
electrical signals
Is a sound signal analog or digital data?
Analog
What are the 2 ways of creating digital audio?
- Sampling
- Synthesis
What is sampling?
Analog data to digital data
What is synthesis?
to create artificial sound through computers
In the sine wave equation:
What does the “a” represent?
amplitude, related to intensity
In the sine wave equation:
What does the “f” represent?
frequency, related to perceived pitch
In the sine wave equation:
What does the “O” represent?
phase, can depend on the location of the sound
What does the period of the sine wave mean?
How long does it take to repeat once
Period is equal to what?
1/frequency
We can only hear frequencies at what Hz?
16-20 Hz
Sampling frequency is equal to what?
equal to or greater than 2 times the frequency
What does Higher bit depth give us?
- more data
- more accurate samples
- takes up more space
A bit depth of less than 8 is used for what?
- not used for sound
- can be used to record blood pressure, heart rate
A bit depth of 8 is used for what?
- Common in telephony
- Quantization of noise sometimes
A bit depth of 16 is used for what?
- highest quality sound
- CDS, DAT, MP3, movies, audio tracks
A bit depth of 24 is used for what?
- even higher quality than 16-bit
- often used before and after sound processing/editing
- DVD, Audio, DTS
What is the equation for bit rate?
(sampling rate)(bit depth)(channels)
An uncompressed audio will typically be saved as what?
.wav format
How many channels are we using?
Either 1 or 2
When was digital audio developed?
70s
When were CDS released?
1982
What is the CD capacity?
74 mins audio format, 780 MB
