Search results

Hey there, I was reading at the 1060 specs, it looks like it has 3 I2S interfaces, of which one has 4 tx/rx pairs, and the other two have 1 tx/rx pair, total of 6 rx/tx pairs, and it also looks like all of the I2S modules support TDM... does it mean that it MAY be possible to implement...

Hi all, I just found out that I'm on the list, too :D sweet! So, how's Audio going so far? And what about USB Audio and MIDI? These are the areas of most interest for me, I only read a couple of posts about people successfully streaming WAV files from SD, and Serial stuff working, but it's 121...

Hey there! For some reasons, I just found out this thread! I'm thrilled by the possibilities! This is amazing :) Is there any plan on giving out more prototypes? I would very much love to test this for use in an upcoming product!

The keyboard will most probably have a Fatar pinout, check this link out for further info: http://www.doepfer.de/DIY/MKE_keyboards.htm In case it is not a Fatar pinout, it will most probably be a very, very similar one, so the schematics in the previous link should help you. A disadvantage...

https://github.com/PaulStoffregen/Audio/search?q=in%3Afile+AUDIO_SAMPLE_RATE_EXACT&unscoped_q=in%3Afile+AUDIO_SAMPLE_RATE_EXACT This query gives you all the files that contain the words AUDIO_SAMPLE_RATE_EXACT. After going thru the 3 pages list of results, these are the names of the files...

This seems like the ideal solution, it would just take one line of code added to the input_i2s.h and output_i2s.h files :)

Hi there, this is the setup() of the last sketch I wrote for the AK4558: void setup() { AudioMemory(16); //while(!Serial); ak4558_1.enable(); ak4558_1.enableIn(); ak4558_1.enableOut(); i2s1.begin(); i2s2.begin(); //setup your other stuff here } you might want to uncomment the...

This is very good news :) they make clocks that are very small, in classic 4 pin SMD crystal packages, that require no more than a pullup and a 100nF cap to work reliably. As long as the I2S chip has an internal PLL, this solution could be used for jitter-free clocking.

Unfortunately, the technical datasheet (not the manual) says at page 18 that the max I2S MCLK frequency is 12.5 MHz. At page 66 it also says that the "I2S MCLK cycle time" in master mode is 40 ns, which equals to 25 MHz; I don't know if the datasheet is wrong (and indeed the MCLK can accept...

I was thinking of adding a USB data lines isolator but current technology only allows for cheap USB isolation up to Full Speed rates (12 Mbps) while I would really like to be able to use the High Speed USB port on the Teensy in the future. Anyway I took a look at your schematic for clarity...

This is a really nice project. I am going to implement something similar for a project I'm working on, instead using the 3.6 and the internal DACs with a split supply powered mux and a S&H circuit to have more outputs (like 8) using the 2 DACs. I was wondering though if you're having any...

One thing I learned while doing the early USB Audio tests was that the device name and general USB properties are not automatically updated on an host for devices using the same name, VendorID and ProductID unless the bcdDevice field in the Device Descriptor is not updated too (usb_desc.c, line 90)

The I2S objects from the Audio Library need specific pins on the Teensy that are usually assigned to other functions (SPI, analog, etc). You can change the position of the conflicting SPI pins using SPI.setMOSI(7) and SPI.setSCK(14). For the Reset and DC pins you do not need to worry as they are...

It looks like the AK4556 doesn't need any code to program it, that is it does not have a serial interface for configuration of its parameters but rather an hardware interface; if you wish to configure the codec in real time using the Teensy you should wire pins DEM1, DEM0, and CSK3-0 to 6...

What I'm trying to do is a Teensy audio board on steroids and in a modular/scalable fashion. On steroids means that the sound quality will be higher than what's currently available, modular/scalable means that users can choose the features they need and scale up their projects with modules...

I can't answer for a), but: b) don't put on your gerber files on the web. you may also not want to put out schematics, but even if one can copy a device from a schematic, he/she won't be able to copy the layout (unless someone reverse engineers your layout) c)I think they're resellers

Yes, there is going to be a mechanical switch to connect one TRS jack to either an opamp in differential configuration (for line levels) or to an opamp in a non inverting configuration with at least 1MOhm input impedance; I find that the simple first stage of the hi-z module I posted before...

Yes exactly. I was going for an asymmetrical gain because if I wanted to use a pot on the first stage I should have used a HUGE pot (1MOhm impedance for up to 500x gain means a 500MOhm pot). In the next revision of the CORE I will drop the dedicate gain pot for the hi-z input and I will have an...

Fully differential outputs are outputs in which there's two opamp, each driving one side of the balanced line; impedance-balanced outputs are outputs in which there's only one opamp driving one side of the balanced line, while the other line is connected to ground on the driver side through an...

So, after quite some development time it's time to go back to the drawing board... As it is right now, it makes no sense to start a kickstarter for the CORE module, because it has no added benefit with regards to the Audio Adaptor Board; apart from the higher quality codec, there's no mic...

There's plenty of update() functions that should be double-checked for correctness too. Also, replying to this post so that I get updates, this is really interesting; this + the dynamic USB change of options that's being tested in another topic could really lead to good stuff in the near future...

I can't say for sure (I don't have a teensy audio shield available atm) but crosstalk between the two channels should be negligible. When you say that you connected speakers to the shield you mean as in preamplified speakers? Because the line out of the Teensy Audio Shield is, well, a line out...

mh, I'm trying a simple sketch where I connected an AudioSynthWaveformSine object to both USB audio outputs but all I get is empty packets. Anyway, I'll try it with I2S objects too and see if it works.

are you getting data in/out using the I2S objects as well? I still have to test them and as far as I'm concerned the AudioOutputUSB object is not working yet.

Silly me: if (tmp!=44100||tmp!=48000) return 0; this should be if (tmp!=44100&&tmp!=48000) return 0; :D This was also the reason why the teensy would hang for 5 seconds between any frequency change requested by the host. Latest version is in this attachment (I also conveniently modified...

Maybe there's something wrong in the set feature function. Checking this right away.

I guess it is already visible; the usb_audio_sampling_frequency value is defined in usb_audio.h as an extern value and declared in usb_audio.cpp so as long as the USB Audio mode is selected that should work. Oh, please note that I only modified the part relative to the Audio only USB mode in...

I found another way, which takes less space; I forgot that you can say how many sampling frequency an AudioStreaming endpoint supports directly in its associated Audio Format descriptor. As in the previous post, the Teensy enumerates properly, responds properly to the requests, changes sampling...

I had similar glitches using the flanger object and updating its values without a delay. The glitches become noticeable when the delay is below 100ms circa. In your previous code I see that you updated the flanger values at every loop; you might want to add a function that stores the values of...

So yeah, I tackled this for the whole afternoon and it kinda works. I say "kinda" because now the Teensy shows two possible configurations (one for 44.1 and one for 48 KHz), it enumerates properly, it switches configuration properly without dying or crashing the host in the process, but I tried...

Nice stuff. I was planning on doing this too. For what I remember from when I did the USB audio descriptors back in 2013, the best option would be to declare a series of different USB configuration descriptors for each sampling frequency (44.1, 48, 88.2, 96, 192); in this way the PC can "ask"...

The HI-Z module is, as the name suggests, an high impedance preamplifier with gain control; its output is connected to the IN module frontend, which is a switched differential line receiver done with an INA137 (switched because you can either use an onboard jack or an external preamp such as the...

In this latest video you can see all the prototypes I've been working on, including the IN HI-Z module, an instrument preamplifier.

So, I finally got all my prototypes working and I started making some content to showcase the CORE module as well as the others; here's the first video I put on YouTube. https://www.youtube.com/watch?v=HKmbYeUzcwQ You can see more action of the same sketch running in the youtube words, with...

It looks like the AK4558 doesn't like anymore if you first configure the I2S clocks then you configure the codec through the I2C bus. The AudioOutputI2S and AudioInputI2S objects call their begin() function in the constructor; if I comment that, then call it manually AFTER having configured the...

I'm working again with this CODEC and I'm facing I2C issues too; this time it looks like using an AudioOutputI2S object breaks the Wire library from working properly. Actually, it's the begin() function that is called in the AudioOutputI2S object that causes this issue. I tested my function...

I know, but good examples (read: more boards) also require money that, being fully autofinanced (by unemployment money), I don't really have. First thing that comes to my mind is open source usb audio interface, something that simply does not exist on the market, then there's a plethora of...

Hey there, I'm working on this project full time since 5 months now: https://hackaday.io/project/20982-mad-modular-audio-devices It's a set of modules aimed towards hifi audio applications with the Teensy 3.x The CORE module sports an AK4558EN from AKM and a ultra-low noise LDO for the analog...

Hey, I got to UP this topic a bit: I just published a draft of the project on Hackaday.io and submitted it for the Hackaday Prize 2017. For every like that I get before 1st May I might get a dollar to help funding the project so I'd be glad if anyone interested could like it there and give me a...

hey there, this question may not be totally related to the topic, but I don't feel like opening a new one. is it possible to use hardware chip select on teensy 3.1/3.2 ?

I see from time to time random spam posts here and I wonder if there's a button in the forum interface to report those useless threads.

That is COOL! I want to play with it! Are you going to release the source? I'd really like to see how you handle data transfer between the PC software and the Teensy :)

My two cents: the new Teensy models have USB data lines broken out on the back of the board through pads. If USB surge protection is needed in order to avoid the device to be disconnected from the host PC if somebody is fiddling with it, you can use an external USB connector with all the static...

Hi there, I've been thinking about this project for one month now and I already started laying out schematics and whatnots for this project, but I think that asking everyone around here for their opinion is the best way to know what is actually going to be useful and what not. So, as you can...

I suppose you are talking about hardware filters. Anyway, it depends on the kind of filter you want to implement. Is it a low pass only? And I would suggest using a bandpass filter on the outputs, to cut away spurious low-frequency 1/f noise and every sampling frequency harmonics. In an ideal...

Hi there, I know what I'm going to say might sound a bit complicated for a beginner, but as someone else already mentioned, you have the option of MULTIPLEXING. That is, you can use a multiplexer to reduce the number of pins needed to control a lot of peripherals, such as buttons and...

Just interfacing all those buttons and knobs and LEDs is going to be tricky to say the least...

Yes, and I had it working too, by making a custom CS class to handle the CS timings, but it was slower than using the normal SPI library, because I had to use 1 word DMA transfers and the overhead imposed by calling the CS object was higher. The DMASPI library works perfectly when you need a...

I might not have made myself clear: I got all the delays settings working on a custom library. So it's cool if more questions arise because I'm not looking for specific answers anyway :) I'd like to investigate if these features are needed or not in the public API in the first place, and if...

Hi guys, I recently had to fiddle with the SPI module on the Teensy 3.6 to be able to interface it in the best possible way with precision ADCs and DACs (600KHz-ish sample rate) and I was wondering if it could be useful to add the following features on the standard Teensy SPI library for anyone...