Wireless and Audio DSP designer working in the fields of Software Defined Radio and electronic music.

Re: Digital Filters that have prescribed phase shift

Reply posted 1 month ago (05/30/2020)
I haven't designed 2-arm IIR filter style Hilbert transforms from first principles myself - I assume most folks looking for such would likely begin with common...

Re: Digital Filters that have prescribed phase shift

Reply posted 1 month ago (05/30/2020)
It's common to use a pair of allpass IIR filters with +/-45deg shifts as an analytic signal converter (aka Hilbert transform) that can generate a complex (quadrature)...

Re: Digital down-conversion and cross-talk

Reply posted 2 months ago (05/19/2020)
By what mechanism do you anticipate crosstalk?All signal processing after the ADC is done in the digital domain. Unless there's something seriously wrong with the...

Re: ADC and Complex Mixer Nyquist question

Reply posted 8 months ago (11/06/2019)
Here's how I'd approach this: Assuming that your ADC is sampling just a real signal, the complete spectrum of this can be viewed as 0-500MHz of the real signal,...

Re: Extract pitch of irregular signal ?

Reply posted 8 months ago (11/02/2019)
Yes, I grabbed the clip you posted and listened to it. I also looked at it in time & frequency with Audacity. It seems to have a fairly strong peak around 377Hz...

Re: Extract pitch of irregular signal ?

Reply posted 8 months ago (11/02/2019)
I just built a musical instrument tuner that's based on phase vocoder principles and it seems to work pretty well on irregular waveforms for estimating frequency....

Re: FIR Convolution Compile Error

Reply posted 9 months ago (10/17/2019)
It would be very helpful if you could tell us which development tools you used that generated these errors. I do a lot of DSP work on STM32 and I've never come...
Seems like you really need to understand why your overlap/save code isn't running on the STM32 properly. Add some diagnostics to the audio processing code - toggle...

Re: What's your favorite modern DSP chip?

Reply posted 1 year ago (05/06/2019)
ARM's Cortex-M4F claims to have "DSP instructions" but it's nowhere near as cycle-efficient as a "real" DSP would be - no simultaneous operand buses, no auto looping...

Re: What's your favorite modern DSP chip?

Reply posted 1 year ago (05/06/2019)
Not strictly a true DSP, but I use STM32 ARM processors for a lot of audio DSP. Any of the families with Cortex M4F do quite nicely - even the low end STM32F3xx...

Re: Audio FFT Filter, noisy clicks

Reply posted 3 years ago (10/17/2017)
As Tim noted earlier, you should be able to do the forward and inverse transforms and get virtually identical input/output. If not then you need to check your work...

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