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2. WavePad Audio Editor - Wikipedia

   en.wikipedia.org/wiki/WavePad_Audio_Editor

   Scrub, search, and bookmark audio to find, recall and assemble segments of audio files; Spectral analysis (FFT), speech synthesis (text-to-speech), and voice changer; Audio restoration tools including noise reduction and click pop removal [4] Supports sample rates from 6 to 96 kHz, stereo or mono, 8, 16, 24 or 32 bits; Remove vocals from music ...

3. Philips SAA1099 - Wikipedia

   en.wikipedia.org/wiki/Philips_SAA1099

   The Philips SAA1099 sound generator is a 6-voice sound chip used by some 1980s devices. [1] [2] [3]It can produce several different waveforms by locking the volume envelope generator to the frequency generator, and also has a noise generator with 3 preset frequencies which can be locked to the frequency generator for greater range.

4. Programmable sound generator - Wikipedia

   en.wikipedia.org/wiki/Programmable_sound_generator

   A programmable sound generator (PSG) is a sound chip that generates (or synthesizes) audio wave signals built from one or more basic waveforms, and often some kind of noise. PSGs use a relatively simple method of creating sound compared to other methods such as frequency modulation synthesis or pulse-code modulation. [1]

5. Fldigi - Wikipedia

   en.wikipedia.org/wiki/Fldigi

   Fldigi (short for Fast light digital) [4] is a free and open-source program which allows an ordinary computer's sound card to be used as a simple two-way data modem.The software is mostly used by amateur radio operators who connect the microphone and headphone connections of an amateur radio SSB or FM transceiver to the computer's headphone and microphone connections, respectively.

6. Signal generator - Wikipedia

   en.wikipedia.org/wiki/Signal_generator

   A signal generator is one of a class of electronic devices that generates electrical signals with set properties of amplitude, frequency, and wave shape. These generated signals are used as a stimulus for electronic measurements, typically used in designing, testing, troubleshooting, and repairing electronic or electroacoustic devices, though it often has artistic uses as well.

7. Texas Instruments SN76489 - Wikipedia

   en.wikipedia.org/wiki/Texas_Instruments_SN76489

   The Texas Instruments SN76489 is a programmable sound generator chip from the 1980s, used to create music and sound effects on computers and video game systems. Initially developed by Texas Instruments for its TI-99/4A home computer, it was later updated and widely adopted in systems like the BBC Micro , ColecoVision , IBM PCjr , Sega's Master ...

8. Direct digital synthesis - Wikipedia

   en.wikipedia.org/wiki/Direct_digital_synthesis

   A basic Direct Digital Synthesizer consists of a frequency reference (often a crystal or SAW oscillator), a numerically controlled oscillator (NCO) and a digital-to-analog converter (DAC) [5] as shown in Figure 1. The reference oscillator provides a stable time base for the system and determines the frequency accuracy of the DDS.

9. Texas Instruments SN76477 - Wikipedia

   en.wikipedia.org/wiki/Texas_Instruments_SN76477

   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.