The primary duty of most sound technicians is to record or reproduce sound using audio equipment. However, they may also be responsible for setting up audio and mixing board equipment for sporting events or artistic productions. Test out what you know about digital audio by taking up the comprehensive test below. All the best!
Defines the minimum dynamic range of a track
States how many samples are taken per second
States how much data passes per second
States the number of different values each sample can be
There are 16 samples per second
There are 16 different dynamic levels each sample can be
Each sample can be any value of representable by 16 1's and 0's
Bit depth relates to the frequency response
8
16
128
256
Sample Rate = 44,100hz
Sample Rate = 48khz
Bit Depth = 128kb/s
Bit Depth = 16
Maximum Length = 74 minutes
Maximum Number of Tracks = 99
Minimum Number of Tracks = 3
Minimum Length = 5minutes
All tracks in WAV format
Each sample can be 48,000 different values
The highest recordable frequency is 48khz
The recorded wave form is sample 48,000 times per second
The track is sampled 48 times
Increasing the sample rate increase the range of recordable frequencies
Increasing the sample rate increases the amount of data required to store the file
Increasing the sample rate increases the amount of time each wave form is sampled
Increasing the sample rate increases the range of dynamic levels available
Occurs as a result of the bit depth being too low
A "ghost" low frequency is recorded when a frequency above the sample rate is recorded
A ghost high frequency is recorded when a frequency below half the sample rate
Can be avoided by using a high-pass filter
Band-Pass
Low Pass
High Pass
High Shelf
Low Shelf
To avoid aliasing, the highest frequency must be half the sample rate
To avoid aliasing, the highest frequency must be double the sample rate
To record the wave form accurately, the highest frequency must be half the sample rate
To record the wave form accurately, the highest frequency must be double the sample rate
1
2
3
4
96khz
48khz
24khz
24hz
Digital Audio
MIDI
Analogue Audio
Kinetic Energy
Analogue Signal > High Pass Filter > A/D Converter > Digital Signal
Digital Signal > D/A Converter > Analogue Signal > Amp > Speaker > Audible Signal
Digital Signal > A/D Converter > Analogue Signal > Amp > Speaker > Audible Signal
Audible Signal > Microphone > Analogue Signal > Low Pass Filter > A/D Converter > Digital Signal
Turns an analogue signal into a string of 1's and 0's
Measures the amplitude of the wave form 48,000 times per second and stores it as a 16bit word
Measures the frequency of the waveform 48,000 times per second
It generates 768000 bits per second
16
(2 x 16 =) 32
(16 to the power of 2 = 16 x 16 =) 256
(2 to the power of 16 = 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 =) 65, 536