Analog/Digital/Analog Audio IN/OUT

Hack

Hi everyone!

In my church there is a device we use for monitoring the audio of the worship band. It's called an Aviom. I want to build something similar to that for my own personal use.

16- 1/4" inputs
http://www.aviom.com/Product-Categories-2/Analog-Input-15/AN-16-i-Input-Module

CAT5 connection to mixer unit
http://www.aviom.com/Product-Categories-1/Mixers-1/A-16II-Personal-Mixer


How would I go about making these 2 separate units that function similarly, but on a smaller/cheaper scale? 2 channel input @ 44.1khz or higher is desirable to start (96k if possible!), and I can scale up from there..

I just don't know how to get started! Thanks in advance!

Hack

I forgot to mention that I am using an SX-48!

JonnyMac

I'm not an audio or analog guy, but it seems that IF (big if) you could find a chip/circuit that will instantaneously convert an analog signal to an eight-bit parallel output you would snatch each channel from an input buss (e.g., RB and RC) and transmit it. Now... my simplistic brain says that if you want two channels at 44.1kHz you would need to transmit at 882k baud (10 bits per byte).

stephenwagner

Hack,
Google "Delta Modulator" and "Delta Sigma Modulator"
They are 1 Bit Analog to digital converters. Voltage to PWM.
Basically:
1. There is a direct relationship between the input voltage change and the PWM pulse width output for the Delta Modulator.·
2. There is a direct relationship between the input voltage amplitude and the PWM pulse width output for the Delta Sigma Modulator.
They can be fabricated in the SX utilizing the comparator, a software Flip Flop, and a clock. 100KHz to 2 MHz.
To convert back to analog:
For the Delta Modulator, you use the same RC time constant (low pass filter) as the input RC time constant. R * C = R * C
For the Delta Sigma Modulator, you use an RC time constant (low pass Filter) with a cut off frequency of 15KHz to 20KHz.
·
I hope this helps.
·
SJW