audio compressor/limiter

Designing hardware and software for systems that use the VS1010 MP3 Audio DSP Microcontroller.
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Arek
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Joined: Thu 2016-09-01 10:58

audio compressor/limiter

Post by Arek » Thu 2018-08-02 11:45

Hi All,

Audio files/tracks are played sometimes louder/quieter. This, of course, is a question of recording.
Have you something for standardization the output signal and playing tracs with near the same volume?
A kind of Automatic Gain Control or audio compressor/limiter but digital. V1010 is a powerfull DSP!

best regards
am

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Panu
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Re: audio compressor/limiter

Post by Panu » Fri 2018-08-03 20:00

Hi!

Of course, we support ReplayGain.

We also have compressor/limiter, but that is completely unrelated to the matter.

Please google ReplayGain, and see the wikipedia page https://en.wikipedia.org/wiki/ReplayGain

-Panu

Hmm, mmm, ReplayGain might not be in VS1010 ROM. I could check how to load it into VS1010, for example from the SD card patch (boot.dlx).. would that be ok?
Info: Line In and Line Out, VS1000 User interface, Overlay howto, Latest VSIDE, MCU Howto, Youtube
Panu-Kristian Poiksalo, VLSI Solution Oy

Arek
Senior User
Posts: 53
Joined: Thu 2016-09-01 10:58

Re: audio compressor/limiter

Post by Arek » Fri 2018-08-03 21:30

with boot.dlx patch is ok.

Arek
Senior User
Posts: 53
Joined: Thu 2016-09-01 10:58

Re: audio compressor/limiter

Post by Arek » Mon 2018-08-06 11:08

Hi Panu,

Thank you. ReplayGain looks perfectly. Of course with boot.dlx is OK.

But... another interesting point for my application is compressor/limiter.
Now I use limiter input in audio amplifier. With soft-solution I can save something.
Where can I find more information about it?

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Panu
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Re: audio compressor/limiter

Post by Panu » Mon 2018-08-06 17:26

Hi!

Can you explain what kind of compressor/limiter you need. What are the parameter values? What is the application of the compressor/limiter? Can you give a web link to a device that basically does what you need?

-Panu
Info: Line In and Line Out, VS1000 User interface, Overlay howto, Latest VSIDE, MCU Howto, Youtube
Panu-Kristian Poiksalo, VLSI Solution Oy

Arek
Senior User
Posts: 53
Joined: Thu 2016-09-01 10:58

Re: audio compressor/limiter

Post by Arek » Mon 2018-08-06 18:01

Hello,

My audio amplifier is TPA3111 from TI.
http://www.ti.com/lit/ds/symlink/tpa3111d1.pdf
s. page 12, PLIMIT.

I think about something like PLIMIT.
Perhaps not directly cut off everything over max amplitude but rather smoothly.

am

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Panu
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Re: audio compressor/limiter

Post by Panu » Thu 2018-08-09 8:55

Ok, understand, you want soft knee limiter. I'll ask Henrik when he gets back to the office next week.

-Panu
Info: Line In and Line Out, VS1000 User interface, Overlay howto, Latest VSIDE, MCU Howto, Youtube
Panu-Kristian Poiksalo, VLSI Solution Oy

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