Important Notice: Our web hosting provider recently started charging us for additional visits, which was unexpected. In response, we're seeking donations. Depending on the situation, we may explore different monetization options for our Community and Expert Contributors. It's crucial to provide more returns for their expertise and offer more Expert Validated Answers or AI Validated Answers. Learn more about our hosting issue here.

Using your Test CD to verify the design of my CD Player (DAC), Im not getting the specified amplitude levels for tracks 3-6. Why?

April 26, 2017Amplitude CD DAC design levels Player Test verify

0

Posted

Using your Test CD to verify the design of my CD Player (DAC), Im not getting the specified amplitude levels for tracks 3-6. Why?

1 Answer

0

Posted

What is probably happening is that the implementation of analog Gain Scaling is incorrect. Problems with tracks 7 and 8 in addition to tracks 3-6 could indicate faulty measurement setup or a defective HDCD IC. If tracks 3-6, 7, and 8 all have incorrect levels then it is almost always a Gain Scaling issue. Verify that the use of SCAL, GAIN and HDCD functions are implemented correctly. The gain change between Peak Extended and non-Peak Extended recordings MUST be performed in the analog domain if SCAL is true. The HDCD signal is active whenever HDCD encoded material is detected. Using this pin to activate a front panel indication when HDCD material is present is the intended and recommended usage. HDCD function is not related to the analog gain scale function. The GAIN function is active when HDCD material is detected AND Peak Extend is present.