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  2. Haeco-CSG - Wikipedia

    en.wikipedia.org/wiki/Haeco-CSG

    The Haeco-CSG process was designed to make stereophonic vinyl LP records compatible with mono playback equipment. These recordings were intended to make the two-channel stereo mix automatically "fold-down" properly to a single mono channel.

  3. Bridged and paralleled amplifiers - Wikipedia

    en.wikipedia.org/wiki/Bridged_and_paralleled...

    A bridge-tied load (BTL), also known as bridged transformerless and bridged mono, is an output configuration for audio amplifiers, a form of impedance bridging used mainly in professional audio & car applications. [1] The two channels of a stereo amplifier are fed the same monaural audio signal, with one channel's electrical polarity reversed.

  4. Covox Speech Thing - Wikipedia

    en.wikipedia.org/wiki/Covox_Speech_Thing

    The printed circuit board DSS007C shows "Ⓟ (1983) U.S. 4,384,170 and others" [11] which is an earlier patent by Forrest S. Mozer. [12] The board a has one integrated circuit only (labeled "ICS1453") and the schematic [ 13 ] shows 8 lines from the parallel port going into one chip with input pins D0-D8 that also has a "DAC output" pin going to ...

  5. Audio and video interfaces and connectors - Wikipedia

    en.wikipedia.org/wiki/Audio_and_video_interfaces...

    A phone connector (tip, ring, sleeve) also called an audio jack, phone plug, jack plug, stereo plug, mini-jack, or mini-stereo. This includes the original 6.35 mm (quarter inch) jack and the more recent 3.5 mm (miniature or 1/8 inch) and 2.5 mm (subminiature) jacks, both mono and stereo versions. There also exists 4.4 mm Pentaconn connectors.

  6. Dynaco - Wikipedia

    en.wikipedia.org/wiki/Dynaco

    Dynaco was an American hi-fi audio system manufacturer popular in the 1960s and 1970s for its wide range of affordable, yet high quality audio components. [1] Founded by David Hafler and Ed Laurent in Philadelphia, Pennsylvania in 1955, it's best known product was the ST-70 tube stereo amplifier.

  7. Monaural sound - Wikipedia

    en.wikipedia.org/wiki/Monaural_sound

    A diagram of monaural sound. Monaural sound or monophonic sound (often shortened to mono) is sound intended to be heard as if it were emanating from one position. [1] This contrasts with stereophonic sound or stereo, which uses two separate audio channels to reproduce sound from two microphones on the right and left side, which is reproduced with two separate loudspeakers to give a sense of ...

  8. Hafler circuit - Wikipedia

    en.wikipedia.org/wiki/Hafler_circuit

    Named after its early proponent audio engineer David Hafler, the circuit exploits the high amount of stereo separation between Left and Right channels and sound phase. [2] This type of system is called 2:2:4, since the rear channels are simulated from a two-channel stereo track, with no actual extra tracks encoded. The rear channels will ...

  9. Tuner (radio) - Wikipedia

    en.wikipedia.org/wiki/Tuner_(radio)

    Marantz 2050L AM/FM stereo tuner (USA; 1978-1980) [1]. In electronics and radio, a tuner is a type of receiver subsystem that receives RF transmissions, such as AM or FM broadcasts, and converts the selected carrier frequency into a form suitable for further processing or output, such as to an amplifier or loudspeaker.