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Q&A Low-pass filter after the output DAC in CD players

[In addition to what Olin wrote earlier.] I looked-up one of the references from the textbook, and I may have found the answer which the author had in mind. This entire spectrum must not be pas...

posted 2y ago by Nick Alexeev‭  ·  edited 2y ago by Nick Alexeev‭

Answer
#2: Post edited by user avatar Nick Alexeev‭ · 2022-10-31T22:00:34Z (about 2 years ago)
  • [In addition to what Olin wrote earlier.]
  • I looked-up one of the references from the textbook, and I may have found the answer which the author had in mind.
  • > This entire spectrum must not be passed on to the player amplifier and loudspeaker. Even though the frequencies above 20 kHz are inaudible, they would overload the player amplifier and set up intermodulation products with the baseband frequencies or possibly with the high-frequency bias current of a tape recorder. Therefore all signals at frequencies above the baseband should be attenuated by at least 50 dB.
  • The article also described the DC reconstruction filter. It's a 3rd order RC filter.
  • [Here baseband is the audible frequency range between 20 Hz and 20 kHz.]
  • D. Goedhart, R. J. van de Plassche, and E. F. Stickvoort, “Digital-to-Analog Conversion in Playing a Compact Disc,” [Philips Technical Review](https://worldradiohistory.com/Philips_Technical_Review.htm), vol. 40, no. 6, 1982, pp. 174-179
  • *[In addition to what Olin wrote earlier.]*
  • I looked-up one of the references from the textbook, and I may have found the answer which the author had in mind.
  • > This entire spectrum must not be passed on to the player amplifier and loudspeaker. Even though the frequencies above 20 kHz are inaudible, they would overload the player amplifier and set up intermodulation products with the baseband frequencies or possibly with the high-frequency bias current of a tape recorder. Therefore all signals at frequencies above the baseband should be attenuated by at least 50 dB.
  • The article also described the DC reconstruction filter. It's a 3rd order RC filter.
  • [Here baseband is the audible frequency range between 20 Hz and 20 kHz.]
  • D. Goedhart, R. J. van de Plassche, and E. F. Stickvoort, “Digital-to-Analog Conversion in Playing a Compact Disc,” [Philips Technical Review](https://worldradiohistory.com/Philips_Technical_Review.htm), vol. 40, no. 6, 1982, pp. 174-179
#1: Initial revision by user avatar Nick Alexeev‭ · 2022-10-31T21:59:22Z (about 2 years ago)
[In addition to what Olin wrote earlier.]

I looked-up one of the references from the textbook, and I may have found the answer which the author had in mind.  

 > This entire spectrum must not be passed on to the player amplifier and loudspeaker. Even though the frequencies above 20 kHz are inaudible, they would overload the player amplifier and set up intermodulation products with the baseband frequencies or possibly with the high-frequency bias current of a tape recorder. Therefore all signals at frequencies above the baseband should be attenuated by at least 50 dB. 

The article also described the DC reconstruction filter.  It's a 3rd order RC filter.

[Here baseband is the audible frequency range between 20 Hz and 20 kHz.]

D. Goedhart, R. J. van de Plassche, and E. F. Stickvoort, “Digital-to-Analog Conversion in Playing a Compact Disc,” [Philips Technical Review](https://worldradiohistory.com/Philips_Technical_Review.htm), vol. 40, no. 6, 1982, pp. 174-179