|
Apple II Sound Cards
Throughout its lengthy, multi-model lifespan, the Apple II series computers lacked any serious built-in sound capabilities. At the time of its release in 1977, this did not distinguish it from its contemporaries (ex. the TRS-80 and Commodore PET), but by 1982, it shared the market with several sound-equipped competitors such as the Commodore 64, whose MOS Technology SID, SID chip could produce sophisticated multi-timbral music and sound effects. All Apple II models (except the Apple IIGS, Apple IIGS, a significantly different, albeit backwards-compatible machine) possess a speaker, but it was limited to 1-bit output in the form of a simple voltage the user could switch on and off with software, creating clicks from the speaker each time the state was toggled. By turning the signal on and off rapidly, sounds with pitches could be produced. This approach places extreme constraints on software design, since it requires the CPU to be available to toggle the output at specific frequenci ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Apple II
The Apple II (stylized as ) is an 8-bit home computer and one of the world's first highly successful mass-produced microcomputer products. It was designed primarily by Steve Wozniak; Jerry Manock developed the design of Apple II's foam-molded plastic case, Rod Holt developed the switching power supply, while Steve Jobs's role in the design of the computer was limited to overseeing Jerry Manock's work on the plastic case. It was introduced by Jobs and Wozniak at the 1977 West Coast Computer Faire, and marks Apple's first launch of a personal computer aimed at a consumer market—branded toward American households rather than businessmen or computer hobbyists. ''Byte'' magazine referred to the Apple II, Commodore PET 2001, and TRS-80 as the "1977 Trinity". As the Apple II had the defining feature of being able to display color graphics, the Apple logo was redesigned to have a spectrum of colors. The Apple II is the first model in the Apple II series, followed by Apple ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mountain Computer
Mountain Computer, Inc. (also known as Mountain Hardware) was a privately held American computer peripheral manufacturer active as an independent company from 1977 to 1988. In its early years, the company chiefly developed products for the Apple II, including sound synthesizers, samplers, and hard disk and tape drives. Mountain also produced floppy disk duplicators for enterprise use. In the mid-1980s Mountain pivoted to focusing on products for the IBM Personal Computer and compatibles. In late 1988, the company was acquired by Nakamichi. History Mountain Computer was founded in 1977 by a group of private investors based in Santa Cruz, California, with $5,000 in cash. James Sedin, an Olympic medalist turned businessman, was asked to manage the company as its chief executive officer; he served that role until well after Mountain's acquisition in 1988, later being named as the company's president and chairman of the board as well as CEO. Mountain Computer was originally based ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Texas Instruments LPC Speech Chips
The Texas Instruments LPC Speech Chips are a series of speech synthesizer digital signal processor integrated circuits created by Texas Instruments beginning in 1978. They continued to be developed and marketed for many years, though the speech department moved around several times within TI until finally dissolving in late 2001. The rights to the speech-specific subset of the MSP line, the last remaining line of TI speech products as of 2001, were sold to Sensory, Inc. in October 2001.ftp://anonymous@ftp.whtech.com/pc%20utilities/qboxpro.zip Theory Speech data is stored through pitch-excited linear predictive coding (PE-LPC), where words are created by a lattice filter, selectably fed by either an excitation ROM (containing a glottal pulse waveform) or an LFSR (linear feedback shift register) noise generator. Linear predictive coding achieves a vast reduction in data volume needed to recreate intelligible speech data. History The TMC0280/TMS5100 was the first self-contained LPC ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Linear Predictive Coding
Linear predictive coding (LPC) is a method used mostly in audio signal processing and speech processing for representing the spectral envelope of a digital signal of speech in compressed form, using the information of a linear predictive model. LPC is the most widely used method in speech coding and speech synthesis. It is a powerful speech analysis technique, and a useful method for encoding good quality speech at a low bit rate. Overview LPC starts with the assumption that a speech signal is produced by a buzzer at the end of a tube (for voiced sounds), with occasional added hissing and popping sounds (for voiceless sounds such as sibilants and plosives). Although apparently crude, this Source–filter model is actually a close approximation of the reality of speech production. The glottis (the space between the vocal folds) produces the buzz, which is characterized by its intensity (loudness) and frequency (pitch). The vocal tract (the throat and mouth) forms the tube, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Echo II (expansion Card)
The Echo II was a plug-in expansion card, speech synthesizer card for the Apple II and Apple IIe personal computers that allowed applications to use speech synthesis. The Echo II used the TMS5220 speech synthesis chip to synthesize speech. The Echo II software could synthesize either unlimited text-to-speech using stitched phonemes, or play back raw LPC data for specific words, with resulting higher speech quality. LPC (linear predictive coding) was the speech synthesis technology used, which allowed applications to encode speech data in a compact form. The Echo II used the TMS 5220 LPC Speech Chip which was popular in other speech synthesizers Speech synthesis is the artificial production of human speech. A computer system used for this purpose is called a speech synthesizer, and can be implemented in software or hardware products. A text-to-speech (TTS) system converts normal languag ... References External links Mirrors.apple2.org.za Compute ISSUE 50 / JULY 1984 (avai ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Passport Designs
Passport Designs Inc. was a software company that created early music production software, such as the pre-MIDI SoundChaser in 1982. Other programs included Master Tracks Pro and Encore. History Founding and early years The company was founded in 1979 by Dave Kusek and John Borowicz, and incorporated in 1980, with Kusek as CEO and Borowicz as Vice-President of Development. They had previously worked together at Electronic Music Labs from 1973–76 and Star Instruments from 1976-79. The company was originally headquartered in Montara, California, moving to Half Moon Bay, California and finally to Foster City, California. Engineering offices were also briefly maintained in Minnesota and Portland, Oregon. Early computer music software The company was a pioneer in the field of computer music, introducing the pre-MIDI SoundChaser in 1982. This Apple II-based system included the Mountain Computer Music System, a programmable 8-voice wavetable synthesizer that fit in two Apple II s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Keith Emerson
Keith Noel Emerson (2 November 1944 – 11 March 2016) was an English keyboardist, songwriter, and record producer. He played keyboards in a number of bands before finding his first commercial success with the Nice in the late 1960s. He became internationally famous for his work with the Nice, which included writing rock arrangements of classical music. After leaving the Nice in 1970, he was a founding member of Emerson, Lake & Palmer (ELP), one of the early progressive rock supergroups. Emerson, Lake & Palmer were commercially successful through much of the 1970s, becoming one of the best-known progressive rock groups of the era. Emerson wrote and arranged much of ELP's music on albums such as ''Tarkus'' (1971) and ''Brain Salad Surgery'' (1973), combining his own original compositions with classical or traditional pieces adapted into a rock format. Following ELP's break-up at the end of the 1970s, Emerson pursued a solo career, composed several film soundtracks, and formed th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Herbie Hancock
Herbert Jeffrey Hancock (born April 12, 1940) is an American jazz pianist, keyboardist, bandleader, and composer. Hancock started his career with trumpeter Donald Byrd's group. He shortly thereafter joined the Miles Davis Quintet, where he helped to redefine the role of a jazz rhythm section and was one of the primary architects of the post-bop sound. In the 1970s, Hancock experimented with jazz fusion, funk, and electro styles, utilizing a wide array of synthesizers and electronics. It was during this period that he released perhaps his best-known and most influential album, ''Head Hunters''. Hancock's best-known compositions include " Cantaloupe Island", " Watermelon Man", " Maiden Voyage", and " Chameleon", all of which are jazz standards. During the 1980s, he enjoyed a hit single with the electronic instrumental " Rockit", a collaboration with bassist/producer Bill Laswell. Hancock has won an Academy Award and 14 Grammy Awards, including Album of the Year for his 200 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Light Pen
A light pen is a computer input device in the form of a light-sensitive wand used in conjunction with a computer's cathode-ray tube (CRT) display. It allows the user to point to displayed objects or draw on the screen in a similar way to a touchscreen but with greater positional accuracy. A light pen can work with any CRT-based display, but its ability to be used with LCDs was unclear (though Toshiba and Hitachi displayed a similar idea at the "Display 2006" show in Japan). A light pen detects changes in brightness of nearby screen pixels when scanned by cathode-ray tube electron beam and communicates the timing of this event to the computer. Since a CRT scans the entire screen one pixel at a time, the computer can keep track of the expected time of scanning various locations on screen by the beam and infer the pen's position from the latest time stamps. History The first light pen, at this time still called "light gun", was created around 1945–1955 as part of the Whirl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
AY-3-8910
The AY-3-8910 is a 3-voice programmable sound generator (PSG) designed by General Instrument in 1978, initially for use with their 16-bit General Instrument CP1600, CP1610 or one of the PIC1650 series of 8-bit microcomputers. The AY-3-8910 and its variants were used in many arcade games—Konami's ''Gyruss'' contains five—and pinball machines as well as being the sound chip in the Intellivision and Vectrex video game consoles, and the Amstrad CPC, Oric-1, Colour Genie, Elektor TV Games Computer, MSX, and later ZX Spectrum home computers. It was also used in the Mockingboard and Cricket sound cards for the Apple II and the Speech/Sound Cartridge for the TRS-80 Color Computer. After General Instrument's spinoff of Microchip Technology in 1987, the chip was sold for a few years under the Microchip brand. It was also manufactured under license by Yamaha Corporation, Yamaha (with a selectable clock divider pin and a double-resolution and double-rate volume envelope table) ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
TRS-80
The TRS-80 Micro Computer System (TRS-80, later renamed the Model I to distinguish it from successors) is a desktop microcomputer launched in 1977 and sold by Tandy Corporation through their Radio Shack stores. The name is an abbreviation of ''Tandy Radio Shack, Z80 icroprocessor'. It is one of the earliest mass-produced and mass-marketed retail home computers. The TRS-80 has a full-stroke QWERTY keyboard, the Zilog Z80 processor, 4 KB dynamic random-access memory (DRAM) standard memory, small size and desk area, floating-point Level I BASIC language interpreter in read-only memory (ROM), 64-character per line video monitor, and a starting price of US$600 (equivalent to US$ in ). A cassette tape drive for program storage was included in the original package. While the software environment was stable, the cassette load/save process combined with keyboard bounce issues and a troublesome Expansion Interface contributed to the Model I's reputation as not well-suited to serious ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mockingboard
The Mockingboard (a pun on "Mockingbird") is a sound card for the Apple II series of microcomputers built by Sweet Micro Systems, which improve on the Apple II's limited sound capabilities. In 1981, Sweet Micro Systems began designing products not only for creating music, but speech and general sound effects as well, culminating in the release of the Mockingboard in 1983. The Mockingboard's hardware allowed programmers to create complex, high-quality sound without need for constant CPU attention. The Mockingboard could be connected to the Apple's built-in speaker or to external speakers. However, as the quality of the built-in speaker was not high, the instruction manual recommended obtaining external speakers. The Mockingboard was available in various models for either the slot-based Apple II / Apple II Plus / Apple IIe systems or in one special model for the Apple IIc. Sound was generated through one or more AY-3-8910 or compatible sound chips, with one chip offering three s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
