I have a new JVC KD-HDR60 car radio on the way, and in reading up on the specs again I was surprised to discover it has a form of IF-DSP filtering and demodulation (in both AM and FM). This is evidently similar to the DSP Tecsun, Kchibo, and Grundig models using a SiLabs chip. The feature is termed DIAS and stands for Digital Intelligent Advanced Sensing.
Does anyone have hands-on experience with one of the JVC car radios in the "HDR" series, or one similar in another manufacturer's line-up? Some car audio forum comments I've come across say the result is lower noise and more resistance to powerline interference, and that weaker stations seem to "pop out" and become more audible (I liked that comment!). JVC's own information about the DIAS II (an upgrade version over the original DIAS) says this: *"**JVC's digital technology helps maximize the performance of regular analog broadcasts. Because unlike analog tuners which are based on hard-wired circuitry, the all-digital DiAS (Digital Intelligent Advanced Sensing) tuner relies on digital programming on a unified chip to deliver versatile next-generation performance. Its advantages include high sensitivity and selectivity with a 16 bandwidth variable Digital IF filter, digital pulse noise canceller for all bands (FM/AM) and intelligent Multipath Noise Canceller for longer stereo reception."* * * I'm guessing that "16 bandwidth variable Digital IF filter" automatically adjusts itself for best S/N. If not, what other criteria would the receiver automatically choose? To my knowledge the bandwidths cannot be manually set by the user. The datasheet for the KD-HDR60 ( http://resources.jvc.com/Resources/00/01/36/46.PDF ) has a block diagram illustrating signal flow through the DIAS circuitry, with the caption "Single Chip Radio DSP". Yep, that sounds like the SiLab chip DSP portable receivers! The radio was $79.99 brand new, through an Amazon.com Marketplace seller. I also discovered that this JVC radio has selectable 9 & 10 kHz channel settings, so guess who will doing a bit of DXing (safely!) on the go? :^) Guy Atkins Puyallup, WA USA _______________________________________________ IRCA mailing list [email protected] http://montreal.kotalampi.com/mailman/listinfo/irca Opinions expressed in messages on this mailing list are those of the original contributors and do not necessarily reflect the opinion of the IRCA, its editors, publishing staff, or officers For more information: http://www.ircaonline.org To Post a message: [email protected]
