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  2. WSPR (amateur radio software) - Wikipedia

    en.wikipedia.org/wiki/WSPR_(amateur_radio_software)

    The type of radio emission is “F1D”, frequency-shift keying. A message contains a station's callsign, Maidenhead grid locator, and transmitter power in dBm. [3] The WSPR protocol compresses the information in the message into 50 bits (binary digits).

  3. Audio time stretching and pitch scaling - Wikipedia

    en.wikipedia.org/wiki/Audio_time_stretching_and...

    One can view the same transposition as "frequency scaling", "scaling" (multiplying) the frequency of every note by 3/2. Musical transposition preserves the ratios of the harmonic frequencies that determine the sound's timbre , unlike the frequency shift performed by amplitude modulation , which adds a fixed frequency offset to the frequency of ...

  4. ValhallaDSP - Wikipedia

    en.wikipedia.org/wiki/ValhallaDSP

    Valhalla Space Modulator is a plugin, free with the purchase of any other ValhallaDSP plugin, which simulates some kinds of flanging and pitch shift effects. [ 28 ] [ 29 ] [ 30 ] Valhalla Delay

  5. Frequency synthesizer - Wikipedia

    en.wikipedia.org/wiki/Frequency_synthesizer

    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.

  6. Wobbulator - Wikipedia

    en.wikipedia.org/wiki/Wobbulator

    A "wobbulator" (without capitalization) is a generic term for the swept-output RF oscillator described above, a frequency-modulated oscillator, also called a "sweep generator" by most professional electronics engineers and technicians. [1] A wobbulator was used in some old microwave signal generators to create what amounted to frequency modulation.

  7. Bell 202 - Wikipedia

    en.wikipedia.org/wiki/Bell_202_modem

    It specifies audio frequency-shift keying (AFSK) to encode and transfer data at a rate of 1200 bits per second (bit/s), half-duplex. It has separate sets of circuits for 1200 bit/s and 300 bit/s rates. [ 1 ]

  8. Phase-shift oscillator - Wikipedia

    en.wikipedia.org/wiki/Phase-shift_oscillator

    The feedback network 'shifts' the phase of the amplifier output by 180 degrees at the oscillation frequency to give positive feedback. [1] Phase-shift oscillators are often used at audio frequency as audio oscillators. The filter produces a phase shift that increases with frequency. It must have a maximum phase shift of more than 180 degrees at ...

  9. Phaser (effect) - Wikipedia

    en.wikipedia.org/wiki/Phaser_(effect)

    A phaser is an electronic sound processor used to filter a signal by creating a series of peaks and troughs in the frequency spectrum. The position of the peaks and troughs of the waveform being affected is typically modulated by an internal low-frequency oscillator so that they vary over time, creating a sweeping effect.