File:Panasonic AN6291 dbx noise reduction IC (1).jpg

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Panasonic AN6291 dbx noise reduction IC.

Around 1980, the hi-fi industry was preparing for the introduction of digital audio. To extend the life of analogue cassette, in 1980-1982 companies introduced different, competing noise reduction technologies that would surpass (purportedly) the Dolby B system. By 1983, Dolby C has won the market, but in 1981-1982 the various systems competed freely. One of the contenders was the already existing dbx system (all lowercase), adapted for home use. Panasonic was the main supporter of consumer dbx, and developed the AN6291 IC for low-cost, low-voltage applications. The AN6291 was announced in December 1981 as the NRX, production began in the summer of 1982. There were similar but rarer Panasonic dbx ICs, like the AN6294. The latter had REC/PB and ON/OFF internal switches, which were not included in the AN6291. These ICs were used in almost all Technics-branded dbx-equipped decks, all the way to the very top of the range (the very first RS-M270X deck and the RP-9022/9024 add-on processors used the Rohm chipset).
The AN6291 is (a) not fully compatible with Blackmer's dbx specification (has a simpler detector arrangement) and (b) its very low operating signal levels limit dynamic range. This was the price of being able to operate at supply voltages as low as 1.8 volts, in portable "personal stereos". On the plus side, as of 2020 the AN6291 is still widely available and it costs pennies. The better alternative, NEC μPC1252H2 + μPC1253H2, is by now unobtainium.
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Author Retired electrician

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current20:43, 28 November 2020Thumbnail for version as of 20:43, 28 November 20201,391 × 2,100 (748 KB)Retired electrician (talk | contribs){{Information |Description=Panasonic AN6291 dbx noise reduction IC.<br> Panasonic was the main supporter of consumer dbx, and developed the AN6291 for low-cost, low-voltage applications. The AN6291 was announced in December 1981 as the ''NRX'', production began in the summer of 1982. The IC made its way into all Technics-branded dbx-equipped decks, all the way to the very top of the range.<br>The AN6291 is (a) not fully compatible with Blackmer's specification (has a simpler detector arrangem...

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