Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Digital Line Level DACs, Digital Crossovers, Equalizers, etc.

My Digital Audio Processor
My Digital Audio Processor
Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 14th February 2018, 11:58 AM   #1
rmdesai is offline rmdesai  India
diyAudio Member
 
Join Date: Jan 2018
Location: Kolhapur, India
Default My Digital Audio Processor

Hello all,

This is a follow-up to a thread that I started here: Why Design Another Sound System?

After working long years in analog, I was impressed by the offerings of a digital signal processor dedicated for audio applications.
I was fascinated by the possibilities of making a board and then re-programming it as many times as possible for the purpose of tweaking an application or using the same board for different applications.
It is the SigmaDSP which I have been on for some years now and have a matured board.
I am listing its features. I hope you guys like it.

- Digital audio Processor based on SigmaDSP platform that supports 2 Analog Inputs, 6 Analog Outputs (On board Stereo DAC for 2 additional outputs)
- On board 3.3V linear power supply (that supports 190V to 270V AC variation) for the processor, DAC and house keeping
- On board 9V linear power supply (that supports 190V to 270V AC variation) for media player that supports MP3, Flac, WAV, WMA through USB, Bluetooth and FM. The media player also has AUX input and comes with a small IR remote control
- On board interface for programming the DSP
- Front panel header (Front panel has 4 x Alps potentiometers, 1 Status LED and Universal IR Receiver. IR Rx is currently not used and is just a placeholder)
- Back panel header (Back panel has 2 x Analog Stereo inputs, SPDIF Co-axial/ Optical inputs that is jumper selectable. All the inputs are summed to form one composite Stereo Input)

Applications:
1. Stereo Audio Processor/ 2.1CH Stereo Audio Processor
2. 2.1CH Surround Sound Decoder and Post-processor
3. 2/3-Way Active Crossover
4. Audio Processor for PA Systems

Regards,

Ravindra.
Attached Images
File Type: gif Enclosure Front.GIF (329.8 KB, 221 views)
File Type: gif Enclosure Back.GIF (355.3 KB, 215 views)
File Type: jpg Enclosure Profile.jpg (186.4 KB, 209 views)
File Type: jpg Open Enclosure- Top View.jpg (271.8 KB, 218 views)
File Type: jpg Back Panel- Looking from Front.jpg (249.1 KB, 214 views)
File Type: jpg Front Panel- Looking from the Back.jpg (266.5 KB, 105 views)

Last edited by rmdesai; 14th February 2018 at 12:23 PM. Reason: Added link to another thread for better navigation
  Reply With Quote
Old 14th February 2018, 12:42 PM   #2
Windforce85 is offline Windforce85  Poland
diyAudio Member
 
Join Date: Nov 2014
This is an extremely interesting device you posted here!

Please clarify following things:

- Is there MP3 / FLAC / etc. music player included with kind of OS and flash memory for music files storage?
- Is there six analogue outputs ready for external amplifiers connection?
- Is there kind of USB connection to the PC and PC-based software for DSP programming included?
- Which external DAC did you use in the design?
- Does it support digital volume control?

- Please explain more about signal digital filtering on DAC's outputs and signal clocking routines. Can we have possibility to alter digital filters?
- Does it support balanced analog signal inputs / outputs if we tweak it's analog stages?


If answer is yes for most of these questions probably you did magnificent thing and hope the people here would understand and appreciate the effort.
  Reply With Quote
Old 14th February 2018, 03:33 PM   #3
rmdesai is offline rmdesai  India
diyAudio Member
 
Join Date: Jan 2018
Location: Kolhapur, India
Hello Windforce85,

I thank you for your interest in my project. Let me answer you questions. If I misinterpret it and if you feel that my answer is not relevant, let me know and I will give it another try.

Quote:
Originally Posted by Windforce85 View Post
- Is there MP3 / FLAC / etc. music player included with kind of OS and flash memory for music files storage?
Yes, music/ media player is included. It has a USB port and an SD Card port and can play songs placed in different directories. The supported format for the files is MP3, FLAC, WMA and WAV. The player has bluetooth 4.0 audio receiver which allows you to play audio from your smartphone. It also has FM receiver. The quality of the player is top class. It needs a 9V supply and I have made a provision for an isolated 9V supply on my processor board for a noise free performance. The player does not have storage space for music files. Music needs to be stored on your USB drive/ SD Card.
The player is a bought out item and can be purchased from here: 12 VDC Bluetooth 4.0 FM Radio MP3 WAV FLAC Audio Preamp Board with Function Cables and Remote

Quote:
Originally Posted by Windforce85 View Post
- Is there six analogue outputs ready for external amplifiers connection?
Yes, there are six analog outputs that you can connect directly to the amplifier.

Quote:
Originally Posted by Windforce85 View Post
- Is there kind of USB connection to the PC and PC-based software for DSP programming included?
Yes, there is programming interface provided that can interface to a programmer. Yes, there is a PC based software and it is free. However the programmer is a bought out item and is available here: EVAL-ADUSB2EBZ Evaluation Board | Analog Devices

Quote:
Originally Posted by Windforce85 View Post
- Which external DAC did you use in the design?
I have used PCM510X from TI

Quote:
Originally Posted by Windforce85 View Post
- Does it support digital volume control?
Yes, the processor supports volume control using either up/dn buttons or a dc control potentiometer. My front panel has 4 x potentiometers. One of them can be configured as a master volume control.

Quote:
Originally Posted by Windforce85 View Post
- Please explain more about signal digital filtering on DAC's outputs and signal clocking routines. Can we have possibility to alter digital filters?
The DACs built into the audio processor as well as the external DACs support R-C filtering and the same recommended scheme is used by me.

Clocking: The processor uses a 12.288MHz crystal as its clock source. It has a PLL built-in and generates all the other necessary clocks internally. The audio signal sampling can be anywhere from 44.1KHz to 192KHz.
The DAC is connected to the processor using the I2S port.

Using the PC based software, it is possible to program the processor as we like.

Quote:
Originally Posted by Windforce85 View Post
- Does it support balanced analog signal inputs / outputs if we tweak it's analog stages?
The processor has two ADCs built in. So it is possible to connect one balanced input signal.

The processor has 4 built-in DACs. I have added one external stereo DAC.
We can configure the application program to output complimentary signals to get 3 x balanced outputs.

Regards,

Ravindra.
  Reply With Quote
Old 14th February 2018, 03:58 PM   #4
rmdesai is offline rmdesai  India
diyAudio Member
 
Join Date: Jan 2018
Location: Kolhapur, India
It should be understood that the proposed hardware can be supplied so that the user can program his own applications using the programmer and the PC based software.

However, it is also possible that the processor can be supplied with a pre-programmed applications, by me, as listed in post #1 of this thread.

I have developed some wonderful applications and some interesting algorithms so the end user only has to connect it to the amplifier and use it.

I will be explaining some of my firmware/ algorithm developed when I explain how the proposed hardware can be used in the 4 applications listed in post #1

Regards,

Ravindra.
  Reply With Quote

Reply


My Digital Audio ProcessorHide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Digital audio Processor fzaad Digital Line Level 6 27th December 2009 09:59 PM
Selfbuilded Digital Audio Processor TheMason Instruments and Amps 1 20th January 2008 11:16 AM
TI's TAS3002 digital audio processor Mark Evans Digital Source 3 17th July 2004 12:55 PM
Digital Audio Processor TAS3001 Kay Digital Source 2 1st September 2002 04:06 PM


New To Site? Need Help?

All times are GMT. The time now is 05:36 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 14.29%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio
Wiki