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Comptia A+ 901 1.4a
Sound, video, network, USB
| Question | Answer |
|---|---|
| What are the four components required to input sound? | sound card, speakers microphone, and recording/ playback software |
| How do computers capture sound? | sampling records sound waves in an electronic format |
| How is sound waves measured? | units of thousands of cycles per second or KHz |
| What is the range in KHz that sound is sampled? | 11 KHz (slow) to 192 KHz (ultra- high quality) |
| Define amplitude | loudness of sound |
| Define frequency | how high or low a tone can be |
| Define timbre | qualities that differentiate the same note played on different instruments |
| What is bit depth? | number of characteristics of a sound captured during sampling. 16 bit is 2 to the 16- 65,536 bits |
| What is monaural? | capture a single track of sound |
| What is stereo? | capture two tracks of sound |
| What defines CD quality? | 44.1 KHz with 16 bit depth and stereo |
| What does the acronym PCM stand for? | Pulse code modulation- type of sound format- also known as WAV. Huge file size- 4 minute song at 44.1 KHz 16 bit, 40 MB of data. |
| How do we get around the huge file size of the WAV format? | Codecs- are compresssor/ decompressor programs that discard the unnecessary audio. |
| What is the most famous codec? | MPEG- 1 Layer 3 known as MP3. |
| What is the most common bit rate for CD- quality MP3? | 128 Kbps. |
| What is bit rate? | amount of info. (#of bits) transferred from compressed file to the MP3 decoder in 1 second- higher the bit rate the better the sound quality |
| What does MIDI stand for? | Musical instrument digital interface- second processor that every sound card has to interpret standardized files- text file that makes the sound processing hardware create sounds- like the sheet music and sound card is instrument- tiny |
| What is MIDI sound dependent on? | The quality of the sound card |
| What are the two most common standards for sound cards? | AC'97 - supports up to 6 channels at 48 KHz/ 20 -bit quality, or Intel High Definition Audio ( Azalia) supports 8 channels at 192KHz/ 32-bit quality. (plus can send multiple streams of music from one PC) |
| What is the difference between Dolby Digital and DTS? | Dolby Digital Sound 5.1, and Digital Theatre Systems competitors- created sound card that supports surround sound plus a subwoofer |
| What are the two types of S/P DIF connectors, and the benefits? | Single S/P DIF connector to receiver or sound card vs. wires to each speaker, optical and coaxial. |
Created by:
MelCrab
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