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Only 11 Real Audio Designers in the World? Do You Really Need a DSP?

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MeasurementBlues
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DSP not dead
MeasurementBlues   11/10/2014 6:51:07 PM
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DSP is moving heavily into digital communications in terms of cleaning up signals both before and after they pass through a transmission channel.

AmpAudio
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Re: Amp improving phone calls
AmpAudio   11/10/2014 3:42:53 PM
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Hello, this is Lindsey from the Amp team. Just wanted to jump in here to say that yes, Amp improves the quality of phone calls. Although iOS typically prevents 3rd party software from processing voice calls and the audio from your apps (music, movies, games) we get around this by processing the audio on external hardware. We designed and built the AMP case to enhance all of your audio, including voice calls, from the iPhone 5/5s, iPhone 6 and 6 Plus.

If there are any questions about how this works, feel free to send us a message at support@ampaudio.com. 

pbeckmann
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Re: DSP
pbeckmann   11/7/2014 2:44:29 PM
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We used the best available numbers for the Blackfin straight out of the ADI reference code.  The lower number that you quoted is for a 16-bit fixed-point transform.  Our specialty is audio processing and for decent fidelity you have to use 32-bit math.  The numbers we quote for the Blackfin are for a 32-bit fixed-point transform.

cbeckmann
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Re: DSP
cbeckmann   11/7/2014 2:13:07 PM
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It's 32 bit fix-point on the Blackfin because it's a native fixed point processor.  On the ARM, we used 32 bit floating point.  For audio, you pretty much need 32 bits.  16 bits won't sound good.

Karl Wiklund
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Re: DSP
Karl Wiklund   11/7/2014 1:16:50 PM
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Are you using the numbers for floating-point emulation?  Generating twiddle tables on the fly?  Maybe using in-place instead of out-of-place transforms? Those numbers still don't sound right.

cbeckmann
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Re: DSP
cbeckmann   11/7/2014 1:02:49 PM
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All of the benchmarks are for 32-bit data and were taken directly from published ADI numbers.  For 16-bit data, the Blackfin numbers are of course lower.

Karl Wiklund
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Re: DSP
Karl Wiklund   11/7/2014 12:42:09 PM
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Thanks.  I'd be careful with those benchmarks though (or at least using the associated algorithms).  Just to pick one off:

256-pt Complex FFT

ADI's own software on Blackfin 2324 cycles

You have 11744 cycles on BF for the same algorithm, but with a different library.

 

Having used Blackfin devices before, the former number is consistent with experience.

 

cbeckmann
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Re: DSP
cbeckmann   11/7/2014 12:28:59 PM
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There is some benchmark information is this presentation at the recent AES conference.

http://www.dspconcepts.com/sites/default/files/white-papers/PD8_Beckmann.pdf

These are benchmarks done on the actual processors.

Karl Wiklund
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DSP
Karl Wiklund   11/7/2014 11:44:46 AM
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As a guy who actually does a fair bit of audio DSP, I'm not really that satisfied with ARMs offerings in this regard (at least in some areas).  None of the M-series devices are up to the task of the sort of number-crunching needed in many algorithms, nor I am all that struck with either the pricing or power consumption when compared to existing fixed-point DSPs. That said, they'd be fine to use if all that you need is some simple filtering or equalization in a product that handles audio + a bunch of other things.  Even many  frequency-domain algorithms don't look like they'd be all that efficient to implement.  Incidentally, has anyone seen benchmarks on these?  I haven't come across any yet.

The NEON co-processor on the A-series on the other hand looks like something I could have some fun with, it's usuability would depend  very strongly on the application (price and power consumption might be deal-breakers).

DrFPGA
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Re: 11 designers-ha!, iphone cell audio question
DrFPGA   11/7/2014 11:26:44 AM
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You are lucky they allowed you to do the comparison. Often you can't even get to that point with an entrenched 'expert'...

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