TMS320C5535: how to improve BF performance in voice frequencies?

Rogerio Almeida

Part Number: TMS320C5535
Other Parts Discussed in Thread: TIDEP-0077

From field:

The customer needs to create microphone for voice receiving in noisy environment in car and would like to improve the BFperformance in voice frequencies (300-3000Hz band).

How we can increase performance for 300-3000Hz band? Can the different distance between microphones can help us?

How to have better BF gain reduction in 180deg angle?

over 5 years ago

0 Cvetolin Shulev-XID over 5 years ago

TI__Guru 65405 points

Hi Rogerio,

You can find useful resources about beam forming parameters at:
www.ti.com/.../TIDEP-0077
processors.wiki.ti.com/.../C55x_CSL_Audio_Pre-Processing
training.ti.com/.../Voice-Processing-Tools-Software-SLIDES.pdf

training.ti.com/voice-preprocessing-demo-on-c5517
this is based on the C5517, but it is applicable for most c55x DSPs.

BR
Tsvetolin Shulev

0 Lalindra Jayatilleke over 5 years ago

TI__Mastermind 30365 points

Rogerio,

For low frequency noise reduction, Adaptive Spectral Noise Reduction (ASNR) will help improve performance. ASNR is included in all our voice processing TI designs including what Cvetolin referenced above. If the customer takes a look at the code for the demos, they will notice this algorithm used.

Regarding the 180 deg angle for the beamformer, this can be done by manipulating the filter coefficients for the beamformer (sysbfflt.c).
The coefficients can be generated by the bearmformer tool bf_tool.exe that's mentioned in the TIDEP-0077 TI design documentation.

Hope this helps.

Lali

0 Rogerio Almeida over 5 years ago in reply to Lalindra Jayatilleke

TI__Mastermind 26145 points

Guys,
thanks a lot.
I sent the link to this post to the FAE that asked the question, and in case he needs further details, he will post here.

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TMS320C5535: how to improve BF performance in voice frequencies?