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The following quotation summarizes its facilities: [T]he SN76477 generates complex audio signal waveforms by combining the outputs of a low frequency oscillator, variable frequency (voltage controlled) oscillator (VCO) and noise source, modulating the resulting composite signal with a selected envelope and, finally, adjusting the signal's attack and decay periods.
The leader oscillator's pitch is generated by user input (typically the synthesizer's keyboard), and is arbitrary. The follower oscillator's pitch may be tuned to (or detuned from) this frequency, or may remain constant. Every time the leader oscillator's cycle repeats, the follower is retriggered, regardless of its position. If the follower is ...
The synthesizer has two oscillators based on the Curtis CEM3340, [3] which powered popular synthesizers such as the Roland SH-101 and Sequential Circuits Prophet 5. [6] Each oscillator has five blendable waveforms: sine, triangle, sawtooth, square and "tone mod", a waveshaping oscillator. There is oscillator sync, PWM and a noise source. A mix ...
ESQ-1 can store 40 rewritable sound patches internally, and features a rewritable EEPROM or fixed ROM cartridge slot for access to 80 additional patches. ESQ-M, a rackmount version of the synthesizer, was released circa 1987, with the same specifications but without the sequencer and a significantly smaller display and less user-friendly interface.
The primary oscillator circuits of a synthesizer are used to create the audio signals. An LFO is a secondary oscillator that operates at a significantly lower frequency than other oscillators, typically below 20 Hz — that is, below the range of human hearing .
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 ...
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]
Synth1 is a digital synthesizer based on the Clavia Nord Lead 2 which is also a digital synthesizer. [11] Synth1 combines the common sound synthesis method of subtractive synthesis with FM synthesis, with the first oscillator having a parameter for frequency modulation. Structurally, the software behaves as though it were a modular analogue ...