Teensy 4.0 filters without audio shield

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joedarock

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I want to use the Teensy 4.0 board for some communications-quality audio filters (LPF, HPF, BPF, etc). It seems to me that the on-board ADC and DAC should be sufficient for this. Can someone point me to a project where someone has done this?

Joe
 
Hi Joe,

with the standard audio lib you could use

* biquad filters
* FIR filters

with a bit more fiddling you could use the audio lib queue object to obtain your audio blocks and do convolution filtering to give you the desired response.

The audio lib standard objects can be found in the Teensy audio lib GUI, the convolution filtering code examples can be found in the forum search function

Please note that the T4 does NOT have an DAC, it is not built into the chip. But for a bit lower quality audio you can use the MQS-output (do a forum search on that)
The T4 ADC has an effective number of bits of about 10 to 11.
 
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