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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, 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 frequencies, and all ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Apple II
Apple II ("apple Roman numerals, two", stylized as Apple ][) is a series of microcomputers manufactured by Apple Computer, Inc. from 1977 to 1993. The Apple II (original), original Apple II model, which gave the series its name, was designed by Steve Wozniak and was first sold on June 10, 1977. Its success led to it being followed by the Apple II Plus, Apple IIe, Apple IIc, and Apple IIc Plus, with the 1983 IIe being the most popular. The name is trademarked with square brackets as Apple ][, then, beginning with the IIe, as Apple //. The Apple II was a major advancement over its predecessor, the Apple I, in terms of ease of use, features, and expandability. It became one of several recognizable and successful computers throughout the 1980s, although this was mainly limited to the US. It was aggressively marketed through volume discounts and manufacturing arrangements to educational institutions, which made it the first computer in widespread use in American secondary ... [...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 1951–1955 as part of the Whi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Serial Port
A serial port is a serial communication Interface (computing), interface through which information transfers in or out sequentially one bit at a time. This is in contrast to a parallel port, which communicates multiple bits simultaneously in Parallel communication, parallel. Throughout most of the history of personal computers, data has been transferred through serial ports to devices such as modems, computer terminal, terminals, various peripherals, and directly between computers. While interfaces such as Ethernet, FireWire, and USB also send data as a serial Stream (computing), stream, the term ''serial port'' usually denotes Computer hardware, hardware compliant with RS-232 or a related standard, such as RS-485 or RS-422. Modern consumer personal computers (PCs) have largely replaced serial ports with higher-speed standards, primarily USB. However, serial ports are still frequently used in applications demanding simple, low-speed interfaces, such as industrial automation sys ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
General Instrument AY-3-8910
The AY-3-8910 is a 3-voice programmable sound generator (PSG) designed by General Instrument (GI) in 1978, initially for use with their 16-bit computing, 16-bit General Instrument CP1600, CP1610 or one of the PIC microcontrollers, PIC1650 series of 8-bit computing, 8-bit microcomputers. The AY-3-8910 and its variants were used in many arcade games—Konami's ''Gyruss'' contains five—and Bally 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, Tiki 100 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 GI'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 a ... [...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 Texas Instruments, 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. 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 Read-only memory, 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 linear predictive coding, ... [...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, whi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Speech Synthesis
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 language text into speech; other systems render symbolic linguistic representations like phonetic transcriptions into speech. The reverse process is speech recognition. Synthesized speech can be created by concatenating pieces of recorded speech that are stored in a database. Systems differ in the size of the stored speech units; a system that stores phones or diphones provides the largest output range, but may lack clarity. For specific usage domains, the storage of entire words or sentences allows for high-quality output. Alternatively, a synthesizer can incorporate a model of the vocal tract and other human voice characteristics to create a completely "synthetic" voice output. The quality of a speech synthesizer is judged by its similar ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Echo II (expansion Card)
The Echo II is a plug-in expansion card, speech synthesizer card for the Apple II and Apple IIe personal computers that allow applications to use speech synthesis. The Echo II provides a speaker/headphones jack on board, with a physical volume control adjustment. The Echo II software can 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 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 ...) is the speech synthesis technology used, which allowed applications to encode speech data in a compact form. The Echo II uses the TMS 5220 LPC Speech Chip which was popular in other speech synthesizers. References External links Mirrors.apple2.org.za {{Speech s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tron
''Tron'' (stylized as ''TRON'') is a 1982 American science fiction action adventure film written and directed by Steven Lisberger from a story by Lisberger and Bonnie MacBird. The film stars Jeff Bridges as Kevin Flynn, a computer programmer and video game developer who is transported inside the software world of a mainframe computer where he interacts with programs in his attempt to escape. It also stars Bruce Boxleitner, David Warner, Cindy Morgan, and Barnard Hughes. ''Tron'' was one of cinema's earliest films to use extensive computer-generated imagery (CGI). The inspiration for ''Tron'' dates back to 1976, when Lisberger became intrigued with video games after seeing ''Pong''. He and producer Donald Kushner set up an animation studio to develop ''Tron'' with the intention of making it an animated film. To promote the studio itself, Lisberger and his team created a 30-second animation featuring the first appearance of the title character. Eventually, Lisberger decide ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Frank Serafine
Frank Serafine (April 6, 1953 – September 12, 2018) was an American motion picture sound designer, sound editor, and composer. He is best known for his work as a sound editor and sound designer on films including the ''Star Trek'' and ''Tron'' series, '' The Addams Family'', '' The Fog'', '' Poltergeist II: The Other Side'', '' Robot Jox'', '' Ice Pirates'', '' Hoodwinked 2'', ''Orgazmo'', '' The Lawnmower Man'', '' Virtuosity'', and '' Field of Dreams.'' He has received numerous awards, such as an Emmy Award for Sound Design on '' The Day After'' (1983) and an Academy Award for Best Sound for '' The Hunt for Red October'' (1990). Early career After performing live with progressive rock guitarist Robben Ford and producing laser light shows at the Fiske Planetarium in Boulder, Colorado, Serafine was selected by Disneyland to compose and produce live grand opening summer shows at the Space Mountain Pavilion which brought him to Southern California. Shortly after, he created se ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Keith Emerson
Keith Noel Emerson (2 November 194411 March 2016) was an English keyboardist, songwriter, composer 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 forme ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Herbie Hancock
Herbert Jeffrey Hancock (born April 12, 1940) is an American jazz musician, bandleader, and composer. He started his career with trumpeter Donald Byrd's group. Hancock soon 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, he experimented with jazz fusion, funk, and electro-funk, electro styles using a wide array of synthesizers and electronics. It was during this time that he released one of his best-known and most influential albums, ''Head Hunters''. Hancock's best-known compositions include "Cantaloupe Island", "Watermelon Man (composition), Watermelon Man", "Maiden Voyage (composition), Maiden Voyage", and "Chameleon (composition), Chameleon", all of which are jazz standards. During the 1980s, he had a hit single with the electronic instrumental "Rockit (song), Rockit", a collaboration with bassist/producer Bill Laswell. Hancock has won an Academy Awards, Ac ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
