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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.
A Dolby noise-reduction system, or Dolby NR, is one of a series of noise reduction systems developed by Dolby Laboratories for use in analog audio tape recording. [1] The first was Dolby A, a professional broadband noise reduction system for recording studios that was first demonstrated in 1965, but the best-known is Dolby B (introduced in 1968), a sliding band system for the consumer market ...
High-end cassette decks could achieve 15 Hz-22 kHz±3 dB frequency response with wow and flutter below 0.022%, and a signal-to-noise ratio of up to 61 dB (for Type IV tape, without noise-reduction) [citation needed]. With noise reduction typical signal-to-noise figures of 70-76 dB with Dolby C, 80-86 dB with Dolby S, and 85 - 90 dB with dbx ...
The first model with Dolby noise-reduction system and an auto reverse function appeared in 1982. [19] The first ultra-compact "cassette-size" Walkman was introduced in 1983, model WM-20, with a telescopic case. This allowed even easier carrying of a Walkman in bags or pockets. [20]
TASCAM Portastudio 244 with dbx noise reduction processor. A pro noise reduction card was the dbx k9, designed to fit into the pro dolby-A A361 frames, which were already in wide use in pro studios of the time, to reduce noise in reel-to-reel tape recordings. One feature of the dbx system was an inbuilt noise-gate, to just shut off anything ...
The Walkman DD was an early series in Sony's Walkman line of portable audio cassette players. The "DD" stood for 'disc drive', with the unit's main motor being directly coupled to the 'disc' of the capstan flywheel assembly while lying perpendicular to it within the unit. This feature was later shared with the Walkman Professional series.
More sophisticated models may feature dual cassette decks (often featuring high-speed dubbing, or sometimes even digitally controlled servo cassette mechanics), separate bass and treble level controls, five- or ten-band graphic equalizers, Dolby noise reduction, analog or LED sound level meters or even VFD, larger speakers, 'soft-touch' tape ...
The Nakamichi 1000 and 700, made in the mid-1970s, had three heads, a dual capstan drive that reduced wow and flutter, and Dolby-B noise reduction to improve the signal-to-noise ratio. The dual capstan drive ensured superior head-to-tape contact, essentially eliminating reliance on the problematic spring pressure pads built into cassette housings.
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