how to design sinx/x filter for TDA1541A?

patwen · 22nd September 2002, 04:46 PM

hi,

I am planning to built a non-oversampling DAC based on TDA1541A.

Would someone kindly point me to some place where I can learn how to built a sinx/x filter to compensate the non-oversampling's roll off?

Thanks

Pat

fedde · 22nd September 2002, 10:06 PM

See Thorstens comments at:
http://pub4.ezboard.com/ffakeidsfrm1...icID=359.topic
and:
http://pub4.ezboard.com/ffakeidsfrm1...icID=361.topic

This is for the TDA1543, but the theory remains the same for the TDA1541.

Have fun,

Fedde

Elso Kwak · 23rd September 2002, 10:59 AM

Hi Patwen & Fedde,
My opinion on the sin(x)/x issue, i.e. slight rolloff of at 20kHz in a NON-OS DAC is reflected here:
http://db.audioasylum.com/cgi/m.pl?f...light=sinx/x&r

It is quite clear that Thorsten and me disagree about the subject.
I made the choice for a perfect square wave and needle pulse response; Thorsten chose a perfect amplitude response. Given the phase response of his network has square wave must be looking horrible. I tried notch filters too and was not satisfied with these. Please also note that most of my experiments are with the AD1865, while Thorsten uses TDA1543 and TDA1541. The AD DAC is a much more bright and alive DAC than the Philips~!

Jocko Homo · 24th September 2002, 12:13 PM

I guess you guys like listening to ultrasonic noise. Can't bend the laws of physics. Wadia tried............

Jocko

artnyos · 24th September 2002, 01:45 PM

If it is ultrasonic, how can you hear it?

Art

Jocko Homo · 24th September 2002, 02:30 PM

When it causes the cheap op-amp they are using to generate IMD products that fall into the audio band.

Jocko

artnyos · 24th September 2002, 02:34 PM

Ohhhhh........ Does IMD stand for Idiots Must be Deaf?

peranders · 24th September 2002, 02:46 PM

Quote:

Originally posted by patwen
I am planning to built a non-oversampling DAC based on TDA1541A.
Would someone kindly point me to some place where I can learn how to built a sinx/x filter to compensate the non-oversampling's roll off?

Hi!

May I ask why you are planning to use this chip? Have it?

Haven't you thought about of using a top modern chip instead?

Make it easy for you and skip the sinx/x thing.

I don't want to spoil your fun but you may experience more fun with a new cool chip.

Crystal CS43122
Crystal CS4390
AKM AK4395
Analog Devices AD1955

Jocko Homo · 24th September 2002, 02:47 PM

I've tried telling them over and over again. Why do you think they will listen to you instead?

Jocko

Ren Hoek · 24th September 2002, 03:10 PM

Because he is Peranders, and he is am extreme designer, man, where you are usually a troublemaker.....

Sin Bin by Sundown,

Ren

22nd September 2002, 04:46 PM	#1
patwen diyAudio Member Join Date: Jan 2002	how to design sinx/x filter for TDA1541A? hi, I am planning to built a non-oversampling DAC based on TDA1541A. Would someone kindly point me to some place where I can learn how to built a sinx/x filter to compensate the non-oversampling's roll off? Thanks Pat

22nd September 2002, 10:06 PM	#2
fedde diyAudio Member Join Date: Jul 2002 Location: Eindhoven, the Netherlands	Sinc(x) See Thorstens comments at: http://pub4.ezboard.com/ffakeidsfrm1...icID=359.topic and: http://pub4.ezboard.com/ffakeidsfrm1...icID=361.topic This is for the TDA1543, but the theory remains the same for the TDA1541. Have fun, Fedde

23rd September 2002, 10:59 AM	#3
Elso Kwak Banned Join Date: Dec 2001 Location: Zamboanga, City of Flowers, Mindanao	Sin(x)/x Hi Patwen & Fedde, My opinion on the sin(x)/x issue, i.e. slight rolloff of at 20kHz in a NON-OS DAC is reflected here: http://db.audioasylum.com/cgi/m.pl?f...light=sinx/x&r It is quite clear that Thorsten and me disagree about the subject. I made the choice for a perfect <B><i>square wave</B></I> and needle <B><I>pulse</B></I> response; Thorsten chose a perfect <B><I>amplitude</B></I> response. Given the phase response of his network has square wave must be looking horrible. I tried notch filters too and was not satisfied with these. Please also note that most of my experiments are with the AD1865, while Thorsten uses TDA1543 and TDA1541. The AD DAC is a much more bright and alive DAC than the Philips~!

24th September 2002, 12:13 PM	#4
Jocko Homo Banned Join Date: Feb 2002 Location: As far from the NOSsers as possible	Groan............. I guess you guys like listening to ultrasonic noise. Can't bend the laws of physics. Wadia tried............ Jocko

24th September 2002, 01:45 PM	#5
artnyos Banned Join Date: Sep 2002 Location: New York	ultrasonic noise If it is ultrasonic, how can you hear it? Art


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

24th September 2002, 02:30 PM	#6
Jocko Homo Banned Join Date: Feb 2002 Location: As far from the NOSsers as possible	How? When it causes the cheap op-amp they are using to generate IMD products that fall into the audio band. Jocko

24th September 2002, 02:34 PM	#7
artnyos Banned Join Date: Sep 2002 Location: New York	IMD Ohhhhh........ Does IMD stand for Idiots Must be Deaf?

24th September 2002, 02:47 PM	#9
Jocko Homo Banned Join Date: Feb 2002 Location: As far from the NOSsers as possible	I've tried telling them over and over again. Why do you think they will listen to you instead? Jocko

24th September 2002, 03:10 PM	#10
Ren Hoek Banned Join Date: Apr 2002	Listen to you Because he is Peranders, and he is am extreme designer, man, where you are usually a troublemaker..... Sin Bin by Sundown, Ren

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Help with filter design	skyraider	Instruments and Amps	3	14th October 2008 12:01 AM
TDA1541A design, which one?	DragonMaster	Digital Source	0	13th August 2005 05:48 PM
Was: sinx/x. Now: standardisation (CE & TÜV ) / protectionism	Elso Kwak	Everything Else	43	27th September 2002 07:35 PM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read