Hello to All:
I want to ask (take a mini poll) as to what people think
are the best digital filter chips that have been on the
market in terms of sound quality. They could be either
current or past production.
Also, does anyone know of web sites that discuss things
like digital filter impulse response and associated issues?
Thanks to all in advance!
fastcat
I want to ask (take a mini poll) as to what people think
are the best digital filter chips that have been on the
market in terms of sound quality. They could be either
current or past production.
Also, does anyone know of web sites that discuss things
like digital filter impulse response and associated issues?
Thanks to all in advance!
fastcat
SM5842 and SM5843 are OK when you want the OS route. Funny but I recently read this about it :
http://www.dagogo.com/47LabFlatfishProgressionBackgroundCommentary.html
http://www.dagogo.com/47LabFlatfishProgressionBackgroundCommentary.html
Fastcat,
No Question, the Pacific Microsonics PMD100 / PMD 200 HDCD filters - IMO nothing comes even close... other filters give digital filters a bad name.
Besides these - next best would be the YSF210 Yamaha 22bit.
The NPC filters (as badged by Burr Brown / TI) always seem to lean on the side of being bass-heavy & poor sound staging compared to the neutral sounding Yamaha’s and HDCD filters.
John
No Question, the Pacific Microsonics PMD100 / PMD 200 HDCD filters - IMO nothing comes even close... other filters give digital filters a bad name.
Besides these - next best would be the YSF210 Yamaha 22bit.
The NPC filters (as badged by Burr Brown / TI) always seem to lean on the side of being bass-heavy & poor sound staging compared to the neutral sounding Yamaha’s and HDCD filters.
John
JohnW:
A bit amazing that the PMD100 & 200 are still the
best sounding digital filter chips. I would have
thought that some manufacturer ( TI, AD, NPC,
etc.) might have come up with something better
at handling the digital filtering. I guess that Keith
Johnson & company (Pacific Microsonics) were
just that much better (or ahead) of the crowd.
Fastcat
A bit amazing that the PMD100 & 200 are still the
best sounding digital filter chips. I would have
thought that some manufacturer ( TI, AD, NPC,
etc.) might have come up with something better
at handling the digital filtering. I guess that Keith
Johnson & company (Pacific Microsonics) were
just that much better (or ahead) of the crowd.
Fastcat
YM3623B is a digital receiver ( DIR ) like Crystal CS8412 etc.
BTW the PMD100 is nothing but neutral IMO on non-HDCD recordings which made me choose other filters at that time. Fastcat, if you include combined digital filter+DAC chips there are other candidates as well.
BTW the PMD100 is nothing but neutral IMO on non-HDCD recordings which made me choose other filters at that time. Fastcat, if you include combined digital filter+DAC chips there are other candidates as well.
In a lot of cases, modern DAC's have built in digital filters eg AD1955 and PCM1792, and many others. Some allow the internal digial filter to be bypassed, so you have to hook up an external one. The question is, how do the internal filters compare to the external ones. One would hope the the internal filters are customized / optimized for the DAC they are part of.
Adrian
Adrian
I know I am reviving a very old thread but I was searching about the same subject so I thought I'd just bump this up.
The SM5842/7 and PMD100/200 seem to be the only decent digital filters that have ever been around. Arn't there really no new digital filters that are as good, if not better, than these filters ?
Digital filters have always appealed to me over 'Sample Rate Conversion' for oversampling 44.1Khz because of the integer oversampling ratio and also a higher ratio(8x) than typical ASRC(192khz).
Are there any modern DSP processors or solutions that could be substituted for these filters ?
I am also not opposed to the idea of doing a pic based diy filter.
The SM5842/7 and PMD100/200 seem to be the only decent digital filters that have ever been around. Arn't there really no new digital filters that are as good, if not better, than these filters ?
Digital filters have always appealed to me over 'Sample Rate Conversion' for oversampling 44.1Khz because of the integer oversampling ratio and also a higher ratio(8x) than typical ASRC(192khz).
Are there any modern DSP processors or solutions that could be substituted for these filters ?
I am also not opposed to the idea of doing a pic based diy filter.
I agree that the PMD100 mentioned above is indeed an excellent filter chip. I'm saying this, because I have a CD-player with a PMD100 and can directly A/B compare it with an ESS Sabre DAC. I'm not sure if the PMD100 is still in production or available, and I'm not sure about the PMD200 either. I have not seen these chips in any of the any newer CD-Players, but I may miss some info here..
From what I have heard, the PMD200 should be even better. However, it has different pin numbers and pin layout, so there is no simple replace/upgrade path from the PMD100 to the PMD200.
I might add, that my subjective impression is that the PMD 100 sounds also really good on non-HDCD discs.
From what I have heard, the PMD200 should be even better. However, it has different pin numbers and pin layout, so there is no simple replace/upgrade path from the PMD100 to the PMD200.
I might add, that my subjective impression is that the PMD 100 sounds also really good on non-HDCD discs.
Thought I'd chip in.
My TDA1541A DAC started off NOS, then 4x OS with SAA7220, then I moved up to PMD100, and I can safely say the latter is by far the best.
Using TDA1541A, with 16 bits, I'm not really doing this for HDCD. With just standard CDs it sounds great.
My TDA1541A DAC started off NOS, then 4x OS with SAA7220, then I moved up to PMD100, and I can safely say the latter is by far the best.
Using TDA1541A, with 16 bits, I'm not really doing this for HDCD. With just standard CDs it sounds great.
The npc datasheets for the sm5842/7 dont have THD charts. Would be nice to see the spectra at different oversampling ratios and signal levels - like most asrc datasheets have.
Anyone know or have any info about that ?
Anyone know or have any info about that ?
Javin5 said:
I believe the PMD200 is a Freescale DSP563xx, and last time I heard, it was still sold. You need a HDCD license to get one however.
I think I answered this on the other thread 🙂
I briefly tried it, but haven't properly investgated.
I'll have a listen again... I'll let you know what happens (maybe on a new thread).
I briefly tried it, but haven't properly investgated.
I'll have a listen again... I'll let you know what happens (maybe on a new thread).
Hi Philpoole,
May I ask if you've tried your dac in NOS form.
If so, what are your findings between NOS vs OS
& are you using OP amps or passive I/V ?
Thank you
May I ask if you've tried your dac in NOS form.
If so, what are your findings between NOS vs OS
& are you using OP amps or passive I/V ?
Thank you
Well, my first implementation with TDA1541A was NOS, and I was really pleased with it. Then, wanting to try OS and see what all the fuss was about, I added an SAA7220P/A, upgraded to a P/B, and I was really pleased with the results. I did initially wonder where all the bass went (NOS has less treble than you should expect), but after aclimatising, it was worth it.
Then, I decided I'd try what some would call a proper digital filter (well, that's unfair, some argue the SAA7220 has flaws) to see what the fuss was about, and it was further improvement. Really pleased with the result.
I don't think I'd go back to NOS, despite it worked well, and was simple to implement.
I'm using a simple opamp IV and passive analogue filtering - which is definitely the weakest link as its loading the opamp stage too much. This is my next area to work on - if I ever get round to it.
Cheers,
Phil
Then, I decided I'd try what some would call a proper digital filter (well, that's unfair, some argue the SAA7220 has flaws) to see what the fuss was about, and it was further improvement. Really pleased with the result.
I don't think I'd go back to NOS, despite it worked well, and was simple to implement.
I'm using a simple opamp IV and passive analogue filtering - which is definitely the weakest link as its loading the opamp stage too much. This is my next area to work on - if I ever get round to it.
Cheers,
Phil
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