True RMS

[LPP]

Dear all,

I am looking for routines to calculate TRUE RMS. I wrote one, but using float, it is very slow.
Thanks for any suggestions.
___________________________
This message was ported from CCS's old forum
Original Post ID: 1030

[Titi Trandafir]

:=Dear all,
:=
:=I am looking for routines to calculate TRUE RMS. I wrote one, but using float, it is very slow.
:=Thanks for any suggestions.

True RMS of a relatively well behaved waveform or more like a random signal ?
___________________________
This message was ported from CCS's old forum
Original Post ID: 1040

[LPP]

:=:=Dear all,
:=:=
:=:=I am looking for routines to calculate TRUE RMS. I wrote one, but using float, it is very slow.
:=:=Thanks for any suggestions.
:=
:=True RMS of a relatively well behaved waveform or more like a random signal ?

It´s like a random sinal.
Do you have any idea?
___________________________
This message was ported from CCS's old forum
Original Post ID: 1068

[LPP]

:=:=Dear all,
:=:=
:=:=I am looking for routines to calculate TRUE RMS. I wrote one, but using float, it is very slow.
:=:=Thanks for any suggestions.
:=
:=True RMS of a relatively well behaved waveform or more like a random signal ?

It´s like a random sinal.
Do you have any idea?
___________________________
This message was ported from CCS's old forum
Original Post ID: 1069

[Titi Trandafir]

:=:=:=Dear all,
:=:=:=
:=:=:=I am looking for routines to calculate TRUE RMS. I wrote one, but using float, it is very slow.
:=:=:=Thanks for any suggestions.
:=:=
:=:=True RMS of a relatively well behaved waveform or more like a random signal ?
:=
:=It´s like a random sinal.
:=Do you have any idea?

Cordic is ideal for fixed point arithmetic (that these microcontrollers can do very fast).You can use 8 bit 2's complement arithmetic. It can do very elegantly, squaring, averaging and then square rooting.
___________________________
This message was ported from CCS's old forum
Original Post ID: 1076

[PGMer]

:=Dear all,
:=
:=I am looking for routines to calculate TRUE RMS. I wrote one, but using float, it is very slow.
:=Thanks for any suggestions.


FYI: Analog Devices has a single chip solution for TRUE RMS to DC conversion w/dB out. With this chip it is possible to measure signals up to 8MHz. (part# AD637)
___________________________
This message was ported from CCS's old forum
Original Post ID: 1097

[LPP]

:=:=:=:=Dear all,
:=:=:=:=
:=:=:=:=I am looking for routines to calculate TRUE RMS. I wrote one, but using float, it is very slow.
:=:=:=:=Thanks for any suggestions.
:=:=:=
:=:=:=True RMS of a relatively well behaved waveform or more like a random signal ?
:=:=
:=:=It´s like a random sinal.
:=:=Do you have any idea?
:=

:=Cordic is ideal for fixed point arithmetic (that these microcontrollers can do very fast).You can use 8 bit 2's complement arithmetic. It can do very elegantly, squaring, averaging and then square rooting.

Sorry, I don´t know about Cordic. Could you send more informations?
___________________________
This message was ported from CCS's old forum
Original Post ID: 1137

[LPP]

:=:=Dear all,
:=:=
:=:=I am looking for routines to calculate TRUE RMS. I wrote one, but using float, it is very slow.
:=:=Thanks for any suggestions.
:=
:=
:=FYI: Analog Devices has a single chip solution for TRUE RMS to DC conversion w/dB out. With this chip it is possible to measure signals up to 8MHz. (part# AD637)

I´m using AD736, but it´s very expensive. I want to change it to a software.
___________________________
This message was ported from CCS's old forum
Original Post ID: 1138

[Titi Trandafir]

Do a //www.google.com search for CORDIC. You will see a lots of hits.
Hope this helps.



:=:=:=:=:=Dear all,
:=:=:=:=:=
:=:=:=:=:=I am looking for routines to calculate TRUE RMS. I wrote one, but using float, it is very slow.
:=:=:=:=:=Thanks for any suggestions.
:=:=:=:=
:=:=:=:=True RMS of a relatively well behaved waveform or more like a random signal ?
:=:=:=
:=:=:=It´s like a random sinal.
:=:=:=Do you have any idea?
:=:=
:=
:=:=Cordic is ideal for fixed point arithmetic (that these microcontrollers can do very fast).You can use 8 bit 2's complement arithmetic. It can do very elegantly, squaring, averaging and then square rooting.
:=
:=Sorry, I don´t know about Cordic. Could you send more informations?
___________________________
This message was ported from CCS's old forum
Original Post ID: 1230