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  2. dbx (noise reduction) - Wikipedia

    en.wikipedia.org/wiki/Dbx_(noise_reduction)

    The Panasonic RQ-J20X portable cassette player from 1982 was the first device to implement the dbx integrated circuit. The original dbx Type I and Type II systems were based on so-called "linear decibel companding" - compressing the signal on recording and expanding it on playback. It was invented by David E. Blackmer of dbx, Inc. in 1971. [1] [2]

  3. Portable audio player - Wikipedia

    en.wikipedia.org/wiki/Portable_audio_player

    Panasonic Stereo Cassette Player RQ-JA63. The first portable audio player available to the general public, the Sony Walkman, was introduced in 1979 and sold very well.It was much smaller than an 8-track player or the earlier cassette recorders, and was listened to with stereophonic headphones, unlike previous equipment which used small loudspeakers.

  4. Nakamichi - Wikipedia

    en.wikipedia.org/wiki/Nakamichi

    A Nakamichi 550. Portable, though the size and weight of an early VCR. The Nakamichi 550 was a portable cassette recorder that had three microphone inputs: one for left channel, one for right channel, and one for a center blend channel. This recorder could run from batteries or AC and was used to make high quality recordings in the field.

  5. Cassette deck - Wikipedia

    en.wikipedia.org/wiki/Cassette_deck

    Cassette decks soon came into widespread use and were designed variously for professional applications, home audio systems, and for mobile use in cars, as well as portable recorders. From the mid-1970s to the late 1990s the cassette deck was the preferred music source for the automobile.

  6. Microcassette - Wikipedia

    en.wikipedia.org/wiki/Microcassette

    Top left, stereo headphones with a cassette player built into one side. Top right, a portable cassette player and audio recorder with radio for use with headphones. Below, a miniature dictation machine mainly for business dictations, use by journalists, etc. The latter is far more widely used than the other two types, which were rather rare.

  7. Digital cassettes - Wikipedia

    en.wikipedia.org/wiki/Digital_cassettes

    These systems were generally used as "mixdown" recorders, to record the finished mix from a multi-track recorder in preparation for the manufacture of a vinyl record, cassette tape, or CD. An example was the Dbx Model 700. [1] Another example is the Sony PCM adaptor series.

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