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W9Lect - Audio Hardware 1 Multimedia History Most PCs today...

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1 Audio Hardware
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2 Multimedia History •Most PC’s today are equipped with Audio and a CD device •These are referred to as multimedia PCs. –Otherwise known as MPC standards. –MPC-1 was introduced in 1990.
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3 Audio Requires a dedicated IRQ, DMA and I/O port address Some manufacturers require a set of these: One for their own implementation One for compatibility with Sound Blaster Pro Uses SAMPLING to represent sound accurately
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4 SAMPLING A method of capturing the state or quality of a particular sound wave (frequency and amplitude) at a set number of times per second. The higher the rate of samples taken the better the sound recorded Increasing the sample rate will increase storage requirements
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5 Some basics Amplitude - Loudness Frequency - a tone’s high or low Bit depth - the number of bits used to describe the characteristics of a sound wave CD quality - recorded at 44.1 KHz @ 16 bit depth and in stereo Codecs - compression and decompression programs MP3 - Most famous codecs program officially known as MPEG-1 Layer 3 MPEG - Moving Pictures Expert Group
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6 Direct X A Windows 32 bit Multimedia technology A set of small API’s (Application Program Interfaces) Positioned between multimedia and hardware Required for 3D gaming
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7 PCI Adapter Soundcard Main components are ADC – Analog to Digital Converter DAC - Digital to Analog Converter DSP - Digital Signal Processor
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8 Multimedia History •MPC-3 was introduced in June 1995 and required as a minimum: –CPU-75mhz Pentium CPU –Ram-8mb –hard disk-540mb –Floppy disk-1.44MB –CD-ROM drive-quad-speed (4X) –Audio sampling rate-16-bit –VGA video resolution-640x480 –Color depth-65,536 colors (16-bit color) –I/O devices-serial, parallel, MIDI, game port –Minimum windows 3.1
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9 Basic Connectors Basic I/O connectors that most audio adapters have.
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  • Spring '11
  • brain
  • Sound card, Dolby Digital, force-feedback game controllers, digital audio input, Internal CD-audio connector, internal 4-pin connector

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