- Thread Starter
- #701
I am currently using a sinc polyphase FIR with 32 taps, which clears about -120dB. I will be capturing measurements shortly. The number of taps can be increased for greater SNR but doubling the taps doubles core utilization.
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- Thread starter Weeb Labs
- Start date
Can someone please posit an example use case for concurrent input from multiple digital devices? Just curious...
SPDIF input is coming along quite nicely. I have managed to implement a very simplistic ASRC that utilizes less than 2% of Core 0. This enables the SPDIF outputs to be driven at the fixed PIO clock and produces a feedback output which can be passed to the USB feedback endpoint. In other words, we now have the ability to mix SPDIF and USB inputs.
- Thread Starter
- #703
My use case would be the desire to mix audio output from my laptop and desktop.
For me PC usb in. Spdif in> CD player > Console > TV > DAP
Concurrently playing, do you mean USB from two separate PCs at the same time? Or your CD and TV audio mixed together?
- Thread Starter
- #708
Mixing as in simultaneously outputting audio from two sources (SPDIF desktop and USB laptop) to the same speakers or headphones.
There is one master volume control and a matrix mixer insertion gain for each channel in the firmware. It can be controlled via USB, external potentiometer/encoder or I2C.
olieb
Addicted to Fun and Learning
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- Jul 1, 2023
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Yeah, it is clear from a technical perspective.
And of course one could play a keyboard or a digital drum set together with a background track or something. Or at last combine Beatles (from an old mix cd) and Rolling Stones (from YouTube) playing "together" (without sync) on your desktop speakers.
Still these use cases appear somewhat exotic in respect of the percentage of people wanting to do that and not having an audio interface for a long time already.
- Thread Starter
- #710
The use case that I have in mind is simply that the user has two sources and wants to be able to use both without the need to switch.
For instance, a PC and game console. Music is not my sole focus here.
Yes the tech function is ≠ "use case"
my limited imagination only comes up with
>> recording / engineering audio from multiple tracks
so happy to leave it at that, I'm sure lots of prospective users are interested in that
EDIT yes gaming while work-from-home and/or background music I can see that
my limited imagination only comes up with
>> recording / engineering audio from multiple tracks
so happy to leave it at that, I'm sure lots of prospective users are interested in that
EDIT yes gaming while work-from-home and/or background music I can see that
Congratulations again on the excellent project.
I see these developments:
- The project seems perfect for an active speaker. Camilladsp might also be good for a desktop, but not for an active speaker. DSPi would be perfect, with SPDIF input and remote control.
- It would be even better if it had multi-room Wi-Fi, like Sonos. The only suitable open-source protocol is Snapcast. I've experimented with ESP32, with poor results (https://www.pschatzmann.ch/home/2023/11/03/arduino-audio-tools-a-snapcast-client-for-arduino/).
- Since SPDIF input is imminent, it would be nice to see it as a Windows input, since sound cards with SPDIF input/output aren't that popular.
And why not, maybe an Ultranet input/output (https://github.com/doughadfield/Ultranet-to-I2S), copyright permitting. Or AES67. I'm fantasizing too much...
I'm not a programmer, but I'll try to collaborate to the best of my ability.
I see these developments:
- The project seems perfect for an active speaker. Camilladsp might also be good for a desktop, but not for an active speaker. DSPi would be perfect, with SPDIF input and remote control.
- It would be even better if it had multi-room Wi-Fi, like Sonos. The only suitable open-source protocol is Snapcast. I've experimented with ESP32, with poor results (https://www.pschatzmann.ch/home/2023/11/03/arduino-audio-tools-a-snapcast-client-for-arduino/).
- Since SPDIF input is imminent, it would be nice to see it as a Windows input, since sound cards with SPDIF input/output aren't that popular.
And why not, maybe an Ultranet input/output (https://github.com/doughadfield/Ultranet-to-I2S), copyright permitting. Or AES67. I'm fantasizing too much...
I'm not a programmer, but I'll try to collaborate to the best of my ability.
Hi, is there a roadmap (a projected timeline of potential upcoming features) somewhere?
I'm currently compiling my shopping list to test this out, and I was wondering, for example, if you plan to support Wi-Fi/Bluetooth in the future (for instance, to control the DSPi with a mobile app) even though I imagine the hardware resources would likely be reduced.
Basically, should I get a Pico 2 or a Pico 2 W?
Also, I find the ability to mix inputs very interesting!
In addition to its use in a backup studio or for general convenience (ambience/gaming), it could become as useful as a Swiss Army knife for nature sound recordists, field journalists, etc.
Could 96kHz support be optional for those using the DSPi in a more "light" way (minimal EQ, no advanced functions, crossovers, etc.)? Is that feasible?
Finally, a quick search led me to this interesting digital recorder project based on Pico ; perhaps it could provide some additional ideas. But again, the question of hardware resources remains.
I'm currently compiling my shopping list to test this out, and I was wondering, for example, if you plan to support Wi-Fi/Bluetooth in the future (for instance, to control the DSPi with a mobile app) even though I imagine the hardware resources would likely be reduced.
Basically, should I get a Pico 2 or a Pico 2 W?
Also, I find the ability to mix inputs very interesting!
In addition to its use in a backup studio or for general convenience (ambience/gaming), it could become as useful as a Swiss Army knife for nature sound recordists, field journalists, etc.
Could 96kHz support be optional for those using the DSPi in a more "light" way (minimal EQ, no advanced functions, crossovers, etc.)? Is that feasible?
Finally, a quick search led me to this interesting digital recorder project based on Pico ; perhaps it could provide some additional ideas. But again, the question of hardware resources remains.
The speed with which Troy is moving is simply amazing. He has said that towards the beginning that he plans to include wifi control.
Since a 2W is only like € 2 more expensive, why not get one already. Or one of each 2 and 2W, since they are usually about the same as the shipping rate.
Yes, thank you, I thought I had read that information but I wasn't sure.
yewneek
Active Member
I still don't understand how it's used, more specifically, where, with what etc.
So basically, the DSPi sits between the source(s) (computer, TV, CD player, gaming console, etc.) and the DAC or multiple DACs (depending on the intended use).
Currently, it can be used for room, speaker, or headphone correction via parametric EQ
and/or
to perform a crossover between a subwoofer and a pair of speakers, or to create multiple crossovers between the drivers of DIY active speakers.
In short, it does the work of a traditional DSP for a fraction of the price.
But other uses are either already planned or potentially feasible.
- Thread Starter
- #719
Yes. A branded Pico is not necessary. Any board with an RP2040 or preferably an RP2350 is supported. You just need to ensure that it exposes enough GPIO to meet your needs.
So, I've placed an order for this initial setup. €30 for the Pico 2WH, an SPDIF bracket for motherboard (the easy way), and a few cables.
The idea for now is to avoid soldering, get a feel for it, create a small 3D-printed enclosure, and have a simple USB-to-SPDIF interface for room correction, speaker correction, and headphone correction. This is all for a friend who also seems keen on the project but lacks specific skills, so I can help him with his attempt.
If the setup seems viable and stable, I'll continue the experiment by adding active crossover to a multi-way speaker.Then I'll compare it with my MiniDSP Flex Eight and my old but still reliable MiniDSP NanoDigi.
Fun days ahead! (Thanks in advance, Troy, for this. )
The idea for now is to avoid soldering, get a feel for it, create a small 3D-printed enclosure, and have a simple USB-to-SPDIF interface for room correction, speaker correction, and headphone correction. This is all for a friend who also seems keen on the project but lacks specific skills, so I can help him with his attempt.
If the setup seems viable and stable, I'll continue the experiment by adding active crossover to a multi-way speaker.Then I'll compare it with my MiniDSP Flex Eight and my old but still reliable MiniDSP NanoDigi.
Fun days ahead! (Thanks in advance, Troy, for this.
)
