Author Topic: Does AU7860A ring a bell?  (Read 3554 times)

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Offline charliecrashTopic starter

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Does AU7860A ring a bell?
« on: February 05, 2014, 06:25:49 pm »
Hi all! First post, and I'll just jump right into it...

I've got a terrible little audiorecorder (tpro.com Urec7) that insists on recording AMI-ADPCM-encoded wav-files in 128kbps 32khz, mono.
Had it just been stereo in a bit higher bitrate I would not have complained, but mono, c'mon... :(

I just had to open the thing and I found that the brain inside is a MV Silicon AU7860A
https://dl.dropboxusercontent.com/u/2666050/au7860a.pdf
http://www.mvsilicon.com/casesInfo.aspx?id=80&typeid=6 (Chinese site)

That chip sits on a pre-made multipurpose-unit with USB & SD reader called SF6021
https://dl.dropboxusercontent.com/u/2666050/sf6021.jpg

What I can see from the board it looks like it's got seperate Left/Right inputs to the correct legs on the chip, so it should be able to record stereo with the right settings.

Question: Is there anyone here that suspects a way to communicate the settings to that chip?
 

Offline amyk

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Re: Does AU7860A ring a bell?
« Reply #1 on: February 06, 2014, 01:18:32 pm »
You're right that the hardware supports stereo, but since it's an OTP device if the firmware doesn't support stereo you're out of luck. But maybe you can try to change the settings for recording from the interface?
 

Offline charliecrashTopic starter

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Re: Does AU7860A ring a bell?
« Reply #2 on: February 07, 2014, 04:57:59 am »
Hmm... I had to Google OTP. Which is it? http://www.acronymfinder.com/OTP.html

Unless there is a hidden combination of buttons on bootup or something I've missed, there's no way I can change it on the interface.

I've contacted both tpro.com and chip manufacturer but no answer as of yet.
 

Offline fake-name

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Re: Does AU7860A ring a bell?
« Reply #3 on: February 07, 2014, 07:31:30 am »
Hmm... I had to Google OTP. Which is it? http://www.acronymfinder.com/OTP.html

Unless there is a hidden combination of buttons on bootup or something I've missed, there's no way I can change it on the interface.

I've contacted both tpro.com and chip manufacturer but no answer as of yet.

OTP =    One Time Programmable

Basically, the firmware is permanently written into the MCU, and cannot be changed after writing. It's the opposite of modern flash/EEPROM program memory.
 


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