Sound Card?. A sound card is a computer expansion card that can input and output sound under the control of computer programs.Soundcards can play music from CDs and mp3 files, synthesize sounds, record audio from external sources and process existing sounds. . Typical uses of sound cards. Typical uses of sound cards include providing the audio component for multimedia applications such as music composition, editing video or audio, presentation/education, and entertainment, .
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1. Sound Cards
2. Sound Card? A sound card is a computer expansion card that can input and output sound under the control of computer programs.
Soundcards can play music from CDs and mp3 files, synthesize sounds, record audio from external sources and process existing sounds.
3. Typical uses of sound cards Typical uses of sound cards include providing the audio component for multimedia applications such as music composition, editing video or audio, presentation/education, and entertainment,
4. Location Most sound cards these days come integrated into the computers mother board already.
Though some mostly the more expensive ones come as PCI plug-ins.
5. Types of sound cards PCI sound cards
Most cards available are PCI
You would get one of these if you want to play a lot of games and watch DVD's
It is recommended you at least get one PCI sound card ISA sound cards
Relatively cheap sound cards
Not as many features and PCI and less quality
Basically for if you don’t want to spend that much money
Does leave open a PCI slot though
6. USB sound card Basically external sound card boxes that plug into your USB slot.
Cards meeting the USB 2.0 specification have sufficient data transfer capacity to support high quality sound operation if their circuit design permits.
7. History of sound cards IBM
8. History of sound cards Earlier soundcards created sound by a method called FM Synthesis.
This process basically used tones of varying frequencies to approximate the actual sound, such as produced by a musical instrument or a natural sound effect.
This was succeeded by Wavetable Synthesis, which in effect, recorded a tiny sample of the actual sound to produce a full rendition of the sound. This process allows for a much truer sound to the original and is half the immersion factor in many games that rely on good sound effects as well as graphics.
9. History of Sound Cards Sound card for the IBM PC architecture were uncommon until about 1988.
10. History of sound Cards Computers internal speaker was the only was only way early PC software could produce sounds of music.
This internal speaker could only create beeps and boops.
11. History of sound cards Some early developed techniques for digital sound reproduction over the PC speaker.
But result was distorted sound and low volume.
12. History of Sound Cards One of the first Manufacturers of sound cards for the IBM PC was AdLib.
They produced a card based on the Yamaha YM3812 sound chip.
13. History of sound cards Creative Labs also marketed a sound card at the same time but it never fully caught on.
14. History of sound cards The most significant historical change in the history of sound card came when Creative Labs introduced the Sound Blaster.
This card cloned AdLib’s but added a sound coprocessor, a game port , and the ability to interface with MIDI equipment.
15. Sound Blaster Card This card could record and play back digital audio.
Had a game port that a joystick could be added to.
It cost nearly the same as Ad-Libs card and was compatible with most of their games while having more features.
16. Sound Blaster Card The sound blaster card soon dominated the computer market.
It ushered in a new era of multimedia applications.
You could play back CD audio, add recorded dialogue to computer games, and even reproduce motion video.
17. Installation Most modern sound card are designed with PCI interface.
These cards connect to the PCI slot of your motherboard.
18. Installation You need to place your sound card in the chosen slot.
You gently push the card down and once it is seated you screw it in.
19. installation Now insert the cable into the CD-IN socket.
20. How Sound Cards Work
21. How Sound Cards Work A sound card facilitates the input and output signals from an audio source.
But many components go into making this happen.
22. How sound card work Sound cards basically do two things as standard operations.
Process incoming signals, from a microphone of other device that produces sound.
Prepares the signal for output to speakers of a file.
23. How sound cards work. The ADC translates the analog waves of your voice into digital data that the computer can understand. To do this, it samples, or digitizes, the sound by taking precise measurements of the wave at frequent intervals.
24. How sound Cards work The number of measurements a second is called the sampling rate.
The sampling rate is measured in kHz, the faster a card sampling rate the more accurate the reconstructed wave is.
With accurate measurements and a fast sampling rate, restored analog signal can almost be identical to the original sound wave.
25. Distortion Even high sampling rates though can cause some reduction in sound quality
This distortion is measured in two ways
Total Harmonic Distortion (THD), expressed as a percentage
Signal to Noise Ratio (SNR), measured in decibels
26. DSP A sound card includes a digital sound processor.
This chip handles most of the computations associated with handling and manipulating incoming signals.
27. DAC There is also the digital to analog converter.
This processes the sound exiting the soundcard into frequencies the human ear can hear and understand.
28. ADC There is also the analog to digital converter.
This handles incoming audio signals for the soundcard to process.
29. MIDI Sound Cards also have Musical Instrument digital interface.
This handles signal input from electronic instruments.
Example, Guitars, Keyboard, Etc….
30. How sound cards work Sound card come with many different plug ins and features.
Most sound cards have a line in for collecting the signal from cassettes of different sound devices, and a microphone connector for use by a microphone of some other low input device.
31. Polyphony Sound card have polyphony, which is more than one distinct voice or sound playable simultaneously and independently, and the number of simultaneous channels.
33. Sources http://www.experiencefestival.com/a/Sound_card_-_History/id/5474091