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  1. Woops, spotted a fundamental flaw, .... ...

    Woops, spotted a fundamental flaw, ....



    asm volatile (
    "QADD %[SUM], %[C1], %[C2]\n"
    "QADD %[SUM], %[C3], %[SUM]\n"
    "QADD %[SUM], %[C4], %[SUM]\n"
    "QADD %[SUM], %[C5],...
  2. Teensy Audio Shield PCB layout and SGTL library oversampling?

    Hi,
    I have been working on a small project using the SGTL5000 on the audio shield, in fact I have used the same board before with other projects and faced the same issues. It is one of noise.

    I...
  3. Hi, well I don't imagine that this is the best...

    Hi, well I don't imagine that this is the best approach. In fact I am very much a newby to the Teensy Arduino environment. I am a little frustrated as I was not, at the time I made these changes,...
  4. I'm quite confident that if you found the correct...

    I'm quite confident that if you found the correct loudspeaker you would not need a separate amplifier. Speakers can be a little confusing. In your case it is not about earth shattering power...
  5. Hi Tim, As Frank B already alluded to, your...

    Hi Tim,
    As Frank B already alluded to, your primary concern is that of storage space. To put some figures around this if you use uncompressed PCM (.wav digital sound files) then at 8bit resolution...
  6. Freeverb - faster code base for Teensy 3.2 using SIMD

    Hi all,

    I'm sharing this library modification with all, in the hope some may find it useful. I noted that whilst developing a little project of mine that the freeverb effect was limited to the...
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    Thanks, your suggestions are appreciated. I took...

    Thanks, your suggestions are appreciated. I took a look at the various editors you mentioned, and I'm still making a decision about which way I might turn.
    In fact I have been trying to get the...
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    752

    Support for Teensy within Mbed RTOS

    Hi,
    I have asked a similar question in the past and would like to clarify what is the current situation. I have developed in the past using Mbed online IDE where support was and still is available...
  9. Thanks Paul, That's really good news. I'm...

    Thanks Paul,
    That's really good news. I'm planning on trying to use the 'Faust' libraries with this codec and after experience with the T3.2, I'm pretty sure I will run out of steam with multiple...
  10. I think perhaps I am overstating this and I...

    I think perhaps I am overstating this and I apologise if that is excessive. Indeed "Not recommended for new designs. No discontinuance decision has been made" So bad sorry, however it just seems to...
  11. Teensy 4.x future support on MCU and Cirrus Logic codec

    Hi,
    I have been using Teensy 3.2 for previous projects but wanted a little more horse power,....so Teensy 4.x. However I noticed that the MCU has been EOL by NXP.
    Is this going to have any...
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    Access to all 3 I2S modules on Teensy 4.0

    Hi,
    A quick questions. I see from the user manual of the NXP chip used on the Teensy4 that it actually has 3 I2S modules. The specs for the Teensy 4.0 states only 2 I2S are broken out. I assume that...
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    Hi, I never truly solved it. Every step I took...

    Hi,
    I never truly solved it. Every step I took made subtle improvements but in the end I came to the conclusion that it is what it is. The CODEC itself does not have exactly hi-fi quality datasheet...
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    Paul, I thought I would let you know a couple of...

    Paul, I thought I would let you know a couple of things.

    Regarding the noisy SGTL5000. I did find a little something, quite interesting. The CODEC has a debug register, one of the options is to...
  15. A little follow up on this suggestion. Firstly it...

    A little follow up on this suggestion. Firstly it does not work simply by tieing the GPIO pin from K20 onto the program pin. The K20 only manages to assert LOW for 100uS. It is not long enough, this...
  16. Replies
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    Hi Paul et al, Just wanted to let you know. I...

    Hi Paul et al,
    Just wanted to let you know. I have totally re-written my driver library for the mbed platform. It now uses DMA. Much better I feel. I have published it and it is available here:
    ...
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    I just wanted to add, there seems also to be...

    I just wanted to add, there seems also to be rather obvious problems with channel separation with the SGTL5000. I was hoping to try using the L & R channels as differential inputs, as I only need one...
  18. Replies
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    Hi All, Well this little codec is stubborn. I...

    Hi All,
    Well this little codec is stubborn. I just would like to run a few questions by you all, see if you have any experience beyond my experiments. Having looked at the specs of the SGTL5000,...
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    Thanks guys, I would have been surprised if it...

    Thanks guys, I would have been surprised if it was not there. But very glad you have proved it. As to the question of quality. I will approach this from the supply lines first now I know the AAF is...
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    Anti Alias filters on SGTL5000

    Does anyone know if the SGTL5000 has anti-alias filters in the analogue gain stage before its ADC. The reason I ask is simple enough. I am fighting to get noise levels to an acceptable level. I have...
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    Thanks, Hmm, I don't think this helps. They are...

    Thanks,
    Hmm, I don't think this helps. They are talking about latency of over 6mS, this is an order of magnitude off the mark. It would make it totally useless in my application. But it's not real...
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    Thanks, what the library supports and what the...

    Thanks, what the library supports and what the chip can do are not the same, but thanks for the heads up.
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    Audio Adapter SGTL5000 Group Delay

    Hi,
    I'm very interested to use the audio adapter (SGTL5000) in a servo control project. Having read the datasheet from cover to cover, I am still having to make a very important assumption about the...
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