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A frequency synthesizer is an electronic circuit that generates a range of frequencies from a single reference frequency. Frequency synthesizers are used in devices such as radio receivers , televisions , mobile telephones , radiotelephones , walkie-talkies , CB radios , cable television converter boxes , satellite receivers, and GPS systems.
Direct digital synthesis (DDS) is a method employed by frequency synthesizers used for creating arbitrary waveforms from a single, fixed-frequency reference clock. DDS is used in applications such as signal generation , local oscillators in communication systems, function generators , mixers, modulators , [ 1 ] sound synthesizers and as part of ...
Chipset (OPS operator chip, EGS envelope generator chip) [34] [59] [60] Yamaha YM2151 (a.k.a. OPM) 1983 32 8 4 Mid-1980s to mid-1990s arcade systems (the most prolific FM chip used in arcades), Sharp X1 and X68000 computers, MSX (CX5M, Yamaha SFG-01 and SFG-05 FM Sound Synthesizer Unit), Yamaha digital synthesizers (DX21, DX27, DX100)
ESFM is available in ESS sound chips starting with the ISA-based ES1688 AudioDrive, up to the PCI-based ES1946 Solo-1E, whereas earlier chips required an external FM synthesizer chip (typically a Yamaha YMF262). ESS's Maestro series of PCI-based sound chips rely on a software implementation of FM synthesis that lacks ESFM's special features.
A numerically controlled oscillator (NCO) is a digital signal generator which creates a synchronous (i.e., clocked), discrete-time, discrete-valued representation of a waveform, usually sinusoidal. [1] NCOs are often used in conjunction with a digital-to-analog converter (DAC) at the output to create a direct digital synthesizer (DDS). [3]
A digitally controlled oscillator or DCO is used in synthesizers, microcontrollers, and software-defined radios. The name is analogous with "voltage-controlled oscillator". DCOs were designed to overcome the tuning stability limitations of early VCO designs.
The VCS 3 has three oscillators (the first two normal voltage-controlled oscillators; the third a low-frequency oscillator), a noise generator, two input amplifiers, a ring modulator, 24 dB/octave low-pass voltage-controlled filter, [citation needed] a trapezoid envelope generator, a joystick controller, a voltage-controlled spring reverb unit, and two voltage controlled output amplifiers.
Additionally there is a screen where users can patch certain parameters to be modified by a low-frequency oscillation, the envelope generator, or VCO2. Those new to Korg synthesizers may find the original Korg MS-10 Manuals [5] useful in understanding the function of its components.
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