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Sound Blaster is a family of sound cards and audio peripherals designed by Singaporean technology company Creative Technology (known in the US as Creative Labs). The first Sound Blaster card was introduced in 1989.

Sound Blaster sound cards were the de facto standard for consumer audio on the IBM PC compatible system platform, until the widespread transition to Microsoft Windows 95, which standardized the programming interface at application level (eliminating the importance of backward compatibility with Sound Blaster), and the evolution in PC design led to onboard audio electronics, which commoditized PC audio functionality. By 1995, Sound Blaster cards had sold over 15 million units worldwide and accounted for seven out of ten sound card sales.[1]

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The history of Creative sound cards started with the release of the Creative Music System ("C/MS") CT-1300 board in August 1987. It contained two Philips SAA1099 integrated circuits, which, together, provided 12 channels of square-wave "bee-in-a-box" stereo sound, four channels of which can be used for noise.

The Sound Blaster 1.0 (code named "Killer Kard"),[3] CT1320A, was released in 1989. In addition to Game Blaster features, it had a 9-voice (11 voices in drum mode)[4] FM synthesizer using the Yamaha YM3812 chip, also known as OPL2. It provided perfect compatibility with the market leader AdLib sound card, which had gained support in PC games in the preceding year. Creative used the "DSP" acronym to designate the digital audio part of the Sound Blaster. This actually stood for Digital Sound Processor, rather than the more common digital signal processor, and was really a simple micro-controller from the Intel MCS-51 family (supplied by Intel and Matra MHS, among others). It could play back 8-bit monaural sampled sound at up to 23 kHz sampling frequency and record 8-bit at up to 12 kHz. The sole DSP-like features of the circuit were ADPCM decompression and a primitive non-MPU-401 compatible MIDI interface. The ADPCM decompression schemes supported were 2 to 1, 3 to 1 and 4 to 1. The CT1320B variety of the Sound Blaster 1.0 typically has C/MS chips installed in sockets rather than soldered on the PCB, though units do exist with the C/MS chips soldered on.[5]

When Microsoft announced Multimedia PC (MPC) in November 1990, it suggested to developers that they use the Sound Blaster as it was the only sound card that came close to complying with the MPC standard. The press speculated that Microsoft based the MPC standard on the Sound Blaster's specifications.[9] By 1993 Computer Gaming World wondered "why would a gamer" buy a competing AdLib card that was not Sound Blaster-compatible.[10] Creative advertised the Sound Blaster 16 ("the 16-bit sound standard") with the slogan "Get Real", emphasizing its "real 100% Sound Blaster compatibility" and rhetorically asking "why those other manufacturers spend so much time comparing themselves to Sound Blaster".[11]

Compute! in 1989 stated that with Sound Blaster, "IBM-compatible computers have taken the lead in sound and music for personal computers". Naming it a Compute! Choice, the magazine described the quality of the opening music of Space Quest III with the card as "extraordinary", praising the quality compared to the Roland MT-32 and Ad Lib versions. Compute! approved of the card's DMA and Creative's dissemination of technical information, and concluded that while the more-expensive MT-32 was superior, Sound Blaster's audio quality was better than that of Ad Lib or Game Blaster.[12]

The final revision of the original Sound Blaster, the Sound Blaster 2.0 was released in October 1991,[15] CT1350, added support for "auto-init" DMA, which assisted in producing a continuous loop of double-buffered sound output. Similar to version 1.0 and 1.5, it used a 1-channel 8-bit DAC. However, the maximum sampling rate was increased to 44 kHz for playback, and 15 kHz for record. The DSP's MIDI UART was upgraded to full-duplex and offered time stamping features, but was not yet compatible with the MPU-401 interface used by professional MIDI equipment. The Sound Blaster 2.0's PCB-layout used more highly integrated components, both shrinking the board's size and reducing manufacturing cost.

Model CT1330, announced in May 1991, was the first significant redesign of the card's core features, and complied with the Microsoft MPC standard.[9]. The Sound Blaster Pro supported faster digital input and output sampling rates (up to 22.05 kHz stereo or 44.1 kHz mono), added a "mixer" to provide a crude master volume control (independent of the volume of sound sources feeding the mixer), and a crude high pass or low pass filter. The Sound Blaster Pro used a pair of YM3812 chips to provide stereo music-synthesis (one for each channel). The Sound Blaster Pro was fully backward compatible with the original Sound Blaster line, and by extension, the AdLib sound card. The Sound Blaster Pro was the first Creative sound card to have a built-in CD-ROM interface. Most Sound Blaster Pro cards featured a proprietary interface for a Panasonic (Matsushita MKE) drive. The Sound Blaster Pro cards are basically 8-bit ISA cards, they use only the lower 8 data bits of the ISA bus. While at first glance it appears to be a 16-bit ISA card, it does not have 'fingers' for data transfer on the higher "AT" portion of the bus connector. It uses the 16-bit extension to the ISA bus to provide the user with an additional choice for an IRQ (10) and DMA (0)m channel only found on the 16-bit portion of the edge connector.

Creative also sold Multimedia Upgrade Kits containing the Sound Blaster Pro. The kit bundled the sound card, a Matsushita CD-ROM drive (model 531 for single-speed, or 562/3 for the later double-speed (2x) drives), and several CD-ROMs of multimedia software titles. As CD-ROM technology was new, the kit included CD-ROM software, representing a very good value to customers. One such kit, named "OmniCD", included the 2x Matsushita drive along with an ISA controller card and software, including Software Toolworks Encyclopedia and Aldus PhotoStyler SE. It was compliant with the MPC Level 2 standard.

Eventually this design proved so popular that Creative made a PCI version of this card. Creative's audio revenue grew from $40 million per year to nearly $1 billion following the launch of the Sound Blaster 16 and related products. Rich Sorkin was General Manager of the global business during this time, responsible for product planning, product management, marketing and OEM sales. Moving the card off the ISA bus, which was already approaching obsolescence, meant that no line for host-controlled ISA DMA was available, because the PCI slot offers no such line. Instead, the card used PCI bus mastering to transfer data from the main memory to the D/A converters. Since existing DOS programs expected to be able to initiate host-controlled ISA DMA for producing sound, backward compatibility with the older Sound Blaster cards for DOS programs required a software driver work-around; since this work-around necessarily depended on the virtual 8086 mode of the PC's CPU in order to catch and reroute accesses from the ISA DMA controller to the card itself, it failed for a number of DOS games that either were not fully compatible with this CPU mode or needed so much free conventional memory that they could not be loaded with the driver occupying part of this memory. In Microsoft Windows, there was no problem, as Creative's Windows driver software could handle both ISA and PCI cards correctly.

In 1998, Creative acquired Ensoniq Corporation, manufacturer of the AudioPCI, a card popular with OEMs at the time. It was a full-featured solution with wavetable MIDI (sample-based synthesizer), 4-speaker DirectSound3D surround sound, A3D emulation, and DOS legacy support via a terminate-and-stay-resident program. It was cheap due to lack of hardware acceleration. It is full-duplex but at least in MS Windows cannot play back several sources at once.

An ES137x chip contains three stereo sample rate converters, some buffers and a PCI busmaster interface. Analogue interfacing is done by a codec chip, which runs at a fixed sampling frequency of 44 (Ensoniq Audio PCI) or 48 kHz (Creative's versions). (ISA soundcards had not resampled but switched between different time bases.) ES137x do not support SoundFonts but a filter-less MIDI engine with wavetable (sample table) sets of 2, 4, and 8 MB size.

When the Sound Blaster Live! was introduced in August 1998, the use of a programmable digital signal processor in PC-audio was not unprecedented, as IBM had already done that with cheap Mwave sound- and modem-cards and Turtle Beach with their professional Hurricane soundcards.

The mainstream model was the Sound Blaster Live! Like the Gold, the Live featured multi-speaker analog output (up to four channels), and identical music/sound generation capabilities (without the bundled MIDI software and interfacing-equipment.)

The Sound Blaster PCI 512 (CT4790) is an EMU10K1-based sound card designed to fill a lower cost segment than the Live! Value. It is capable of most of the Live! Value's features aside from being limited to 512 MIDI voice polyphony (a software-based limitation), lacking digital I/O, removal of expansion headers, and only stereo or quadraphonic output support. The card's circuit layout is somewhat simpler than that of the Live! series.[18][19]

The Audigy was controversially advertised as a 24-bit sound card. The EMU10K2's audio transport (DMA engine) was fixed at 16-bit sample precision at 48 kHz (like the EMU10K1 in the original Live!), and all audio had to be resampled to 48 kHz in order to be accepted by the DSP (for recording or rendering to output.)

Sound Blaster Audigy 2 (September 2002) featured an updated EMU10K2 processor, sometimes referred to as EMU10K2.5, with an improved DMA engine capable of 24-bit precision. Up to 192 kHz was supported for stereo playback/record, while 6.1 was capped at 96 kHz. In addition, Audigy 2 supported up to 6.1 (later 7.1) speakers and had improved signal-to-noise ratio (SNR) over the Audigy (106 vs. 100 decibels (A)). It also featured built-in Dolby Digital EX 6.1 and 7.1 decoding for improved DVD play-back. The Audigy 2 line were the first sound cards to receive THX certification. 2351a5e196