semente Posted October 21, 2021 Share Posted October 21, 2021 What's the SCF filter in this AKM D/A chip, what does it do? Is it analogue or digital? Thanks "Science draws the wave, poetry fills it with water" Teixeira de Pascoaes HQPlayer Desktop / Mac mini → Intona 7054 → RME ADI-2 DAC FS (DSD256) Link to comment
0 semente Posted October 21, 2021 Author Share Posted October 21, 2021 Found the answer "Science draws the wave, poetry fills it with water" Teixeira de Pascoaes HQPlayer Desktop / Mac mini → Intona 7054 → RME ADI-2 DAC FS (DSD256) Link to comment
0 bogi Posted October 21, 2021 Share Posted October 21, 2021 54 minutes ago, semente said: What's the SCF filter in this AKM D/A chip, what does it do? Is it analogue or digital? It seems to be Switched Capacitor Filter and it is the D/A conversion stage itself. All processing before SCF is performed yet in digital domain - it is a digital signal preparation (digital volume control in DATT module, oversampling stage called here as De-Emphasis & Interpolator, delta sigma modulation) to be suitable for the D/A conversion low pass filter named here as SCF. semente 1 i7 11850H + RTX A2000 Win11 HQPlayer ► Topping HS02 ► 2x iFi iSilencer ► SMSL D300 ► DIY headamp DHA1 ► HiFiMan HE-500 Link to comment
0 Popular Post opus101 Posted October 21, 2021 Popular Post Share Posted October 21, 2021 A switched capacitor filter is a kind of active filter where instead of using resistors and capacitors, the filter is made out of capacitors and switched capacitors take the place of resistors. There are a couple of advantages of this - in an IC, resistors normally can't be made to precise values but capacitors fare better in the precision stakes. The main advantage though is a switched capacitor is like a clock frequency controlled resistor. Which means filters can be made with variable cut-off frequencies, controlled by the frequency of the clock fed to them. semente, Superdad and bogi 1 1 1 Link to comment
0 Superdad Posted October 28, 2021 Share Posted October 28, 2021 On 10/21/2021 at 4:55 AM, opus101 said: The main advantage though is a switched capacitor is like a clock frequency controlled resistor. Which means filters can be made with variable cut-off frequencies, controlled by the frequency of the clock fed to them. Your whole post is the best explanation I have seen on the rationale behind SCFs. Thank you! opus101 1 UpTone Audio LLC Link to comment
Question
semente
What's the SCF filter in this AKM D/A chip, what does it do?
Is it analogue or digital?
Thanks
"Science draws the wave, poetry fills it with water" Teixeira de Pascoaes
HQPlayer Desktop / Mac mini → Intona 7054 → RME ADI-2 DAC FS (DSD256)
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