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  2. TRS-80 Model 4 - Wikipedia

    en.wikipedia.org/wiki/TRS-80_Model_4

    Misosys Inc. sold a Model 4 Hardware Interface Kit which enables the extra keys on the Model 4 keyboard, and in a 128 KB Model 4, the banked memory. [9] Intellitech sold a program called Supermod4 that allows Model III programs running on a Model 4 to activate the 4 megahertz CPU clock, larger video display, the speaker and the function keys. [10]

  3. Wireless keyboard - Wikipedia

    en.wikipedia.org/wiki/Wireless_keyboard

    These devices connect and communicate with their parent device via the Bluetooth protocol. A wireless keyboard can be connected using RF technology with the help of two parts, a transmitter and a receiver. The radio transmitter is inside the wireless keyboard. The radio receiver plugs into a keyboard port or USB port. Once the receiver and ...

  4. 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.

  5. Logitech Unifying receiver - Wikipedia

    en.wikipedia.org/wiki/Logitech_Unifying_receiver

    Logitech Unifying receiver (older) Logitech Unifying receiver (newer) Unifying logo The Logitech Unifying Receiver is a small dedicated USB wireless receiver, based on the nRF24L-family of RF devices, [1] that allows up to six compatible Logitech human interface devices (such as mice, trackballs, touchpads, and keyboards; headphones are not compatible) to be linked to the same computer using 2 ...

  6. Waldorf Music - Wikipedia

    en.wikipedia.org/wiki/Waldorf_Music

    PPG Wave 2.x series (1981-1987), designed by Wolfgang Palm, was a predecessor of Waldorf The WAVE and Microwave. After the demise of PPG in 1987, Waldorf carried forward the legacy of wavetable synthesis. Using an ASIC designed by Wolfgang Palm, the company developed the Microwave and later the WAVE synthesizers. However, Palm was never ...

  7. Modulated continuous wave - Wikipedia

    en.wikipedia.org/wiki/Modulated_continuous_wave

    In the United States, the Federal Communications Commission defines modulated continuous wave in 47 CFR §97.3(c)(4) as "Tone-modulated international Morse code telegraphy emissions having designators with A, C, D, F, G, H or R as the first symbol; 2 as the second symbol; A or B as the third symbol."

  8. Envelope (music) - Wikipedia

    en.wikipedia.org/wiki/Envelope_(music)

    The General Instrument AY-3-8910 sound chip includes only a hold time parameter; the sustain level is not programmable. Another common variation in the same vein is the AHDSR (attack, hold, decay, sustain, release) envelope, in which the hold parameter controls how long the envelope stays at full volume before entering the decay phase.

  9. Line trap - Wikipedia

    en.wikipedia.org/wiki/Line_trap

    Hence, a line trap unit is inserted between the busbar and connection of coupling capacitor to the line. It is a parallel tuned circuit containing inductance and capacitance. It has low impedance for power frequency and high impedance to carrier frequency. This unit prevents the high frequency carrier signal from entering the neighboring line. [4]