Introduction to Sound Card

A sound card is device that allows the computers to output the audio signals through the speakers. It enables the computer to manipulate the sound of the different applications and output it through the internal and external speakers. Sound cards have different kind of usages in the computer like they are used with the audio CDs, games, voice recognition, business presentations, audio conferencing and multimedia applications etc.  Almost all the sound cards support the MIDI, which is a standard to represent the music electronically.  They also equipped with the digital to analog converter that converts the digital data into the analog format and analog to digital converter that converts the analog signals back to the digital. 

Sound cards digitized the audio signals and store them on the computer’s hard disk for the storage, editing, copying and further processing.  To provide the multiple simultaneous functionalities, most of the cards have more than one built-in sound chip. Because of the importance of the audio, many computer manufacturers now have the built-in sound card chip on the motherboards. Most of the sound cards use the following two methods of converting the digital signals into the analog.

FM Synthesis:  It copies the expressions and sounds of the different musical instruments according to the built-in formulas.

Wavetable Synthesis: It relies on the actual recordings of the musical instruments to produce the sound.  Wavetable Synthesis produces more accurate sounds.

To listen to music, watching the video and to have the good gaming and multimedia experience the sound card is an integral component of every computer system. It can either be inserted into the PCI slot of the motherboard or the motherboard has the built-in sound card chip. Common manufactures are Yamaha, Realtek, C-Media, Creative Labs, Sound Blaster and M-Audio.

MIDI stands for the Musical Instruments Digital Interface and it is a standardized protocol that allows the different musical instruments to communicate with each other.   In addition to the basic components for the audio processing, many sound card includes the different other hardware components that include the followings.

Memory

Like the video adapter, sound card uses its own memory to provide the faster data processing.

Digital Signal Processing

Digital Signal Processor or DSP is a specialized microprocessor. It performs the calculations and audio processing like analog and digital conversions and takes away the processing load from the system’s processor.  But if a sound card doesn’t have the DSP, it uses the system’s processor for the audio processing.

Input/Output Connections

Many sound cards provide the connections to the microphone, speakers, USB, MIDI and firewire.

Most of the latest sound cards allow you to compose, mix and edit your own music with through software.