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68.33.3.16
In Reply to: RE: Seen Fremer's show report? posted by amioutaline? on October 14, 2014 at 07:54:28
has anybody heard the DS Audio DS-W1?
dee
;-D
True terror is to wake up one morning and discover that your high school class is running the country.
quote by Kurt Vonnegut
Follow Ups:
"There are mainly two methods to play back Vinyl records; Velocity-proportional method and Amplitude-Proportional method. MM/MC cartridges belong to the Velocity-proportional method. In which, read-out signal depends on how fast a tiny magnet (or a tiny coil in MC) moves in the magnetic field. At lower frequencies, a magnet moves slow in the magnetic field, so the resulted read-out signal level is very small. Whereas in high frequencies, a magnet moves faster, so that the read-out signal becomes un-proportionally large. Therefore, Play-back system requires Equalizer to compensate / correct Velocity-Proportional read-out signals to the original sound. (Technically speaking, MM/MC signals are time differential of Analog sound information. Signal reproduction requires Integration of the read-out signals, which requires additional electrical circuits)
Optical cartridge belongs to Amplitude-Proportional method.
In which, read-out signal depends on how much distance stylus moved. Therefore, there is no dependence on frequencies in read-out signals. It results no equalization required in the read-out signals except RIAA-Curve correction.
As the conclusion, Optical cartridge requires a very simple circuit in read-out process, enabling a pure and clear sound reproduction without any signal treatment on the recorded signals on a vinyl record. (RIAA curve correction is necessary)"
Referencing the bold text (emphasis added), what "additional electrical circuits", and what "equalization required" (not RIAA)?
All cartridges I know of go to a phono stage for amplification and RIAA treatment without any "additional electrical circuits" (ignoring active/passive stepup) or some mysterious equalization.
I have no idea that they are talking about?
:(
the optical system measures stylus displacement in the direction of the two grove walls, while MC and MM cartridges measure velocity of the displacement. The whole point of the RIAA recording curve is to equalize the displacement over the frequency range (more or less) i.e a 15 kHz signal recorded at 0 db will make a wave the same size as a 40 Hz signal that requires a lot of boost in the high frequencies and attenuation of the low frequencies. Now if you have a device that measures the displacement then you do not need the de=emphasis used for velocity sensing devices....therefore the correction is not the typical RIAA curve but a different one which is quite simpler. Also the optical system needs DC current just like a strain gage.
here is the write up on the strain gage cartridge.
True terror is to wake up one morning and discover that your high school class is running the country.
quote by Kurt Vonnegut
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