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In Reply to: Apples and oranges... posted by kuribo on January 27, 2004 at 00:46:09:
I just read some info. on how the Tact will convert a digital signal to a analog signal for the speakers."There is no amplification, as we know it traditionally, involved at all. The signal stays in the digital domain all the way up to the filter, which folds the PWM signal back into an analog feed for the speakers."
This will be the same basic way that Spectron does it, except the Tact's sampling rate is only 352.8kHz verse 500khz on the Spectron.
"You can also directly input a digital SPDIF (PCM) data stream where it is precisely converted to PWM in the digital domain. Like AM and FM modulation, PWM modulation has a carrier modulated by a signal (music). In a Spectron amp the carrier is 500 KHz which is analogous to the sampling rate. This is hugely over sampled in an audio world where 44 KHz (2x over sampling) is CD quality, 96 KHz the next new thing and 192 KHz the bleeding edge. Next this logic level signal is converted into a high voltage PWM square wave (at ±125V in the Musician II, ±48 V in the Troubadour). Finally, this square wave signal is passed through a low pass filter to block the carrier and pass only the audio signal which is now at speaker power levels. By operating in the digital domain a Spectron amp can deliver performance parameters that previously were unobtainable."
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- Not true - gme109 01/27/0414:44:56 01/27/04 (0)
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