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Old 22nd September 2002, 05:46 PM   #1
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Smile 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
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Old 22nd September 2002, 11:06 PM   #2
fedde is offline fedde  Netherlands
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Default 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
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Old 23rd September 2002, 11:59 AM   #3
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Smile 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~!
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Old 24th September 2002, 01:13 PM   #4
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Default Groan.............

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

Jocko
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Old 24th September 2002, 02:45 PM   #5
artnyos is offline artnyos  United States
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Question ultrasonic noise

If it is ultrasonic, how can you hear it?


Art
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Old 24th September 2002, 03:30 PM   #6
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Default How?

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

Jocko
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Old 24th September 2002, 03:34 PM   #7
artnyos is offline artnyos  United States
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Ohhhhh........ Does IMD stand for Idiots Must be Deaf?
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Old 24th September 2002, 03:46 PM   #8
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Default Re: how to design sinx/x filter for TDA1541A?

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
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/Per-Anders (my first name) or P-A as my friends call me
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Old 24th September 2002, 03:47 PM   #9
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I've tried telling them over and over again. Why do you think they will listen to you instead?

Jocko
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Old 24th September 2002, 04:10 PM   #10
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Exclamation 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
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