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Covox Speech ThingDate invented1987; 33 years ago ( 1987)Invented byCovox, IncConnects toPrinter portUseaudio device attached to the computerCommon manufacturersCovox, Disney, othersThe Covox Speech Thing is an external audio device attached to the computer to output. It was composed of a primitive 8- using a and an analogue signal output, and plugged into the of the.The Speech Thing was introduced on December 18, 1987 by Covox, Inc of, for about US$70 (US$79.95 as of 1989 ), but as its parts were much cheaper than the complete plug, and as its design was fairly simple, people soon started to build their own variants.The plug was used long into the 1990s, as were still very expensive at that time. The plug was also quite popular in the.An inherent problem of the design is that it requires very precise resistors. If normal parts are used, the values get shuffled, especially for quiet sounds, resulting in distortion. Nevertheless, the sound quality of the Covox plug is far superior compared to the; even today, a self-built Covox plug is still an inexpensive way to give old computers sound capabilities. Contents.Commercial products.

Covox Speech Thing - the simplest hardware DAC, bundled with speech synthesis software, marketed originally as part of voice synthesis and recognition system. Disney Sound Source - a hardware system with a similar design to the Covox Speech Thing, marketed by in early 1990s. It consisted of 3 parts: a FIFO and a DAC on PCB plugged into printer port and separate amplifier / speaker box. Its price was set to only $14 and it was supported by many games (see below). It used external power (9 volt battery) and could be turned on/off by software.

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Contrary to the Speech Thing the output rate is determined by the hardware (7 kHz) and the design features a 16 byte allowing for autodetection and flow control of the output. In 2015 the hardware was reverse engineered so compatible circuits can be built from easily available off the shelf components. It is also emulated by the popular emulator.Features.

One widely used variantIn its simplest form, Covox received 8-bit, mono signal through the parallel port and produced analog output that could be amplified and played back on. Was not fixed by hardware means, and theoretically Covox can support any sampling rate. In practice, however, speed limits make it rather hard to achieve even standard CD-quality 44100 Hz (the average 80286 system could handle sampling rate for COVOX with 12kHz, the 486SX-33 system with 44kHz). Another limiting factor compared to real sound cards was the need to use the computationally demanding timer interrupt to play background music, since there was no available. However the sound quality can increased by software which has the dithering, thus the aliasing noise is minimized and the dynamics increased (used inInertia Player and FastTracker 2 as Interpolating option).Advanced versions of Covox-like devices featured:. Printer port forwarding connectors — allowed to plug printer into the Covox and use both (playing audio and printing) without reconnections, although not at the same time.

Whenever something is printed, loud noise is created. Both DAC and ADC converters;. ADCs with tiny microphone preamplifiers;. DACs with amplification;. Sourcing power from serial port;.

Numerous sound-enhancing (hi-fi) features, like filters or equalizers;. Stereo capability, either by using two parallel ports or one port with switching using strobe (pin #1) and line feed (pin #14) signals.Compatibility. Home-built Covox Games The Covox plug couldn't directly substitute any of the popular cards of that age (, etc.), but several games / platforms supported it directly.