Embedded Systems Conference
Breaking News
Comments
Newest First | Oldest First | Threaded View
<<   <   Page 2 / 3   >   >>
Etmax
User Rank
Author
Re: Nice chip
Etmax   7/10/2014 10:01:46 AM
NO RATINGS
I read the headline and thought that must be another one of Max's ideas :-) neat chip, but I reckon a, ARM M4 could probably do the lot with some tight coding. Of course if you want a low power version difinitely the way to go.

jambrose950
User Rank
Author
Re: Re MSGEQ7: Nice chip
jambrose950   7/9/2014 7:04:19 PM
NO RATINGS
Thank you.

Mixed Signal Integration has been advertising in the "other" electronic magazine for years now, and Design Ideas, Planet Analog, and Ideas for Design have been published on our products. 

I don't alway read every issue cover to cover, so I could see missing a few of them over the years. 

David Ashton
User Rank
Author
Re: Re MSGEQ7: Nice chip
David Ashton   7/9/2014 6:17:15 PM
NO RATINGS
@JAmbrose...Good to see you pushing these very natty chips you make.  but it strikes me you have been hiding your light under a bushel - I had never heard of you before now, but will certainly have a look at what you offer.   

(I think you need to pay Max a commission if he hasn't already asked :-)

(PS @Max - if this causes you to get commission, I want a cut :-))

Max The Magnificent
User Rank
Author
Re: Re MSGEQ7: Nice chip
Max The Magnificent   7/9/2014 2:34:14 PM
NO RATINGS
@rheslip0: Another approach - use the Teensy 3.1 and audio shield from pjrc.com. You only need one processor which is Arduino compatible so you can use the Neopixel libraries.

Actually, you can't use any-old-NeoPixel library -- the ones from AdaFruit, for example, use low-level assembly code to get the timing right. However PRJC also does a NeoPixel library that drives 8 strips using the DMA Engine.

When I last talked to Paul at PRJC, they were still working on the audio library. I'm delighted to hear that it's finished -- I'm designing my BADASS display in such a way that I'll be able to swap out my first-pass solution (chipKIT + Arduino) for a Teensy 3.1-based solution -- it will be fun to play with that -- but one step at a time LOL

rheslip0
User Rank
Author
Re: Re MSGEQ7: Nice chip
rheslip0   7/9/2014 2:02:54 PM
NO RATINGS
Another approach - use the Teensy 3.1 and audio shield from pjrc.com. You only need one processor which is Arduino compatible so you can use the Neopixel libraries. They have a really nice audio DSP library including up to 1024 bin FFTs for the ARM M4 core. Teensy board about $20, audio sheild about $15. It will blow the doors off your solution:

https://www.youtube.com/watch?v=CblOUmK3oKM

I'm not associated with PJRC but I am very impressed with their products. I beleive they also have a high performance LED strip driver too.

Rich H

 

Max The Magnificent
User Rank
Author
Re: Re MSGEQ7: Nice chip
Max The Magnificent   7/9/2014 1:13:50 PM
NO RATINGS
@jambrose: We (Mixed Signal Integration) also have a 1/6th octave Low Power Spectrum Analyzer IC; the MSLSA.  The outputs are 6 AC outputs and you can easily cascade the devices.

Very interesting -- I'm printing off the datasheet as we speak...

jambrose950
User Rank
Author
Re MSGEQ7: Nice chip
jambrose950   7/9/2014 1:00:41 PM
NO RATINGS
We (Mixed Signal Integration) also have a 1/6th octave Low Power Spectrum Analyzer IC; the MSLSA.  The outputs are 6 AC outputs and you can easily cascade the devices.  Here is a link:

http://www.mix-sig.com/index.php?option=com_content&view=article&id=128:mslsa&catid=52


Samples and evaluation boards are available.  

jambrose950
User Rank
Author
Re: MSGEQ7 Nice chip
jambrose950   7/9/2014 12:51:31 PM
NO RATINGS
Yes, you can adjust the 33 pF and 200 kohm RC values to achieve different clock frequencies. However the filters are quite wide, so the effect would be minimal.   Others have found the interpolation technique  in firmware gives better results. 

Max The Magnificent
User Rank
Author
Re: Nice chip
Max The Magnificent   7/8/2014 6:23:27 PM
NO RATINGS
@David: However that leads me to my question...with only 7 frequency bands and 2 channels will your BADASS display now only have 14 channels instead of the 16 in the diagram?

Thsi is something I've been pondering -- I think interpolating between two channels to create an additional channel would give me a quick fix. Of course, when I move onto doing all thus in software using an FFT (or similar algorithm), I'll be able to split things up into as many "buckets" as I wish.

 

Max The Magnificent
User Rank
Author
Re: Nice chip
Max The Magnificent   7/8/2014 6:20:52 PM
NO RATINGS
@Rcurl: I notice that you can set the oscillator frequency of the chip externally. I wonder if you could intentionally skew the oscillator frequency of a second chip being fed the same audio input to get some extra bands in between the intended ones?

Oooh -- that is an interesting idea...

 

<<   <   Page 2 / 3   >   >>


Radio
NEXT UPCOMING BROADCAST
In conjunction with unveiling of EE Times’ Silicon 60 list, journalist & Silicon 60 researcher Peter Clarke hosts a conversation on startups in the electronics industry. One of Silicon Valley's great contributions to the world has been the demonstration of how the application of entrepreneurship and venture capital to electronics and semiconductor hardware can create wealth with developments in semiconductors, displays, design automation, MEMS and across the breadth of hardware developments. But in recent years concerns have been raised that traditional venture capital has turned its back on hardware-related startups in favor of software and Internet applications and services. Panelists from incubators join Peter Clarke in debate.
Most Recent Comments
Flash Poll
Top Comments of the Week
Like Us on Facebook

Datasheets.com Parts Search

185 million searchable parts
(please enter a part number or hit search to begin)
Special Video Section
Chwan-Jye Foo (C.J Foo), product marketing manager for ...
The LT®3752/LT3752-1 are current mode PWM controllers ...
LED lighting is an important feature in today’s and future ...
Active balancing of series connected battery stacks exists ...
After a four-year absence, Infineon returns to Mobile World ...
A laptop’s 65-watt adapter can be made 6 times smaller and ...
An industry network should have device and data security at ...
The LTC2975 is a four-channel PMBus Power System Manager ...
In this video, a new high speed CMOS output comparator ...
The LT8640 is a 42V, 5A synchronous step-down regulator ...
The LTC2000 high-speed DAC has low noise and excellent ...
How do you protect the load and ensure output continues to ...
General-purpose DACs have applications in instrumentation, ...
Linear Technology demonstrates its latest measurement ...
10:29
Demos from Maxim Integrated at Electronica 2014 show ...
Bosch CEO Stefan Finkbeiner shows off latest combo and ...
STMicroelectronics demoed this simple gesture control ...
Keysight shows you what signals lurk in real-time at 510MHz ...
TE Connectivity's clear-plastic, full-size model car shows ...
Why culture makes Linear Tech a winner.