5102656
Description
Flashcards by Dan Turner, updated more than 1 year ago
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Created by Dan Turner
over 8 years ago
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| Question | Answer |
| What is an Audio compression codec? | An Algorithm which selectively deletes unperceivable sound to save space. |
| The Shannon-Nyquist Sampling Theory is: | The Sampling frequency must be equal to, or greater than, twice the highest frequency. |
| Pulse Code Modulation is: | PCM is a digital representation of an analog wave. Where magnitude of the waveform is taken at regular intervals (sampling frequency). |
| A higher bit depth... | increases dynamic range and allows a better recreation of the wave |
| A low bit depth.... | causes waves to be distorted and unrealistic, no matter how high the sample rate |
| As Bit Depth and Sampling Frequency increase... | higher quality audio is achieved. |
| CD-quality stereo audio has a bit-rate of | 1.4 Mb/second. |
| Two types of Audio Compression | Lossy and Lossless |
| Popular types of Lossy Codec | .mp3 .ogg .aac .ac3 .wma |
| Popular types of lossless codec | .flac .alac .wav .ape .wmal |
| What is the Psychoacoustic Model? | A recreation of the human hearing system. |
| Name two types of masking... | Temporal Masking Simultaneous Masking |
| The MPEG Codec uses how many overlapping even bands? | 32 |
| How many uneven critical bands are there? | 24 |
| Name the 6 sections to a bitstream packet for MPEG Layer 1 | Header CRC Bit Allocation Scale Factor Sub-band Samples Aux Data |
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