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Stumbled upon btinterface

Posted 16th July 2013 at 08:32 PM by merlin2069er
Updated 19th July 2013 at 12:36 PM by merlin2069er (adding links...)

I was browsing the google play store one day when I came across something called BTInterface.

Anyways, that free btinterface program led me to btinterface.com where I watched a few of the videos posted. I was immediately impressed with the possibilities. So I bought an android phone, and installed the btinterface app.

I picked up a couple of arduinos (mega 1280) about $12 each, and bt modules, about $8 on ebay, and also picked up some relays to fool around with (about $12) and jumper cables...

BTInterface will allow you to connect to a bt module, then send commands to it. You need a sketch on the arduino to do something with those commands.

BTInterface being a bit limited in what it can do - I purchased basic4android.

So, with basic4android I put together a few screens, on a couple of tabs. The first tab, "Sources" - allows you to edit the name and select a source (these names are saved to an internal...
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Old

Interesting Horn info

Posted 11th July 2013 at 11:55 PM by DougL

In this post the User clams that the Compression driver Atlas PD5V is a derivative of the WE555, which was good down to 100 Hz


http://www.diyaudio.com/forums/multi...ml#post3558010

There was also mention of an AES paper on how to create a phase plug for a cone driver.

Based on Romy's ideas on a mid-bass horn, This might cover down to 200 / 300 hz to transition to a Tapped horn.
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Old

I2S transcoder

Posted 7th July 2013 at 01:57 PM by abraxalito
Updated 16th September 2013 at 02:32 AM by abraxalito (Schematics added, pic of 2nd build added)

Here's a circuit that's been a long time in gestation - some logic that converts I2S from 64fs (32bits per sample) down to 32fs (16bits).

Almost all the S/PDIF receiver chips nowadays output a bit clock at 64fs (2.8MHz for RBCD) because the format has the potential to support up to 24bits. When being driven from a CD player though, there's no chance of any useful information occupying those spare bits. As my interest is to run all signals as slow as possible to keep noise to the absolute minimum, 64fs to me is profligate generation of RF when 32fs will do the job. But only the WM8805 supports this format and then only when software programmed.

The other reason for wanting the slower bit clock is that my LAID design relies on shift registers and the 32fs clock gives me twice as good utilization of the serial storage - no bits are being wasted on zero padding.

This circuit is designed to do the job with the fewest standard logic chips I could manage...
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