Does anyone know a way to take an audio signal and output it multiple times with different amplitude and phases tia sal2Greetings AllI have one source for an audio signal and would like to send it to 8 differentoutputs simultaneously, but would like to be able to change the phase and amplitude ofeach of the 8 outputs separately. I was thinking of using 8 small amplifiers (which isn?t cheap) to increase theamplitude of the 8 output signals but I?m not sure how I can change the phase of eachsignal separately. Is there a product on the market that is inexpensive or can someone recommend acircuit I could build? I would use an oscilloscope to make sure the phase and amplitude of each of the8 outputsis where I would want it. Example:Source is a sine wave generated by a laptopOutput 1) starts at 0 degreesOutput 2) starts at 10 degrees out of phase increase amplitude by 1 voltOutput 3) starts at 15 degrees out of phaseOutput 4) starts at 40 degrees out of phaseOutput 5) starts at 60 degrees out of phase increase amplitude by 3 voltsOutput 6) starts at 100 degrees out of phaseOutput 7) starts at 120 degrees out of phaseOutput 8) starts at 126 degrees out of phaseTiaSal2

outputs each of the amplitude signal separately. circuit 8 outputs---View in Courier:IN>---+------------------------------------[OPAMP]--->OUT1 | +--[ADC]--+-[LUT1]--[DAC]--[FILTER]--[OPAMP]--->OUT2 | +-[LUT2]--[DAC]--[FILTER]--[OPAMP]--->OUT3 | +-[LUT3]--[DAC]--[FILTER]--[OPAMP]--->OUT4 | +-[LUT4]--[DAC]--[FILTER]--[OPAMP]--->OUT5 | +-[LUT5]--[DAC]--[FILTER]--[OPAMP]--->OUT6 | +-[LUT6]--[DAC]--[FILTER]--[OPAMP]--->OUT7 | +-[LUT7]--[DAC]--[FILTER]--[OPAMP]--->OUT8 JF

Does anyone know a way to take an audio signal and output it multiple times with different amplitude and phases tia sal2

Nov 12, 2008 23 Replies

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John Fields 17 years ago

delay

time.

For one degree increments, your shift register would have to be 9 bits wide and 360 stages long, and would have to be loaded serially using a 9 X 256 lookup table and some glue logic to switch the serial inputs from the LUT to the 360° tap on the shift register. a simpler way might be: (View in Courier) CLK>---[COUNT]--+-[LUT1]--[DAC]--[FILTER]--[OPAMP]--->OUT1 | +-[LUT2]--[DAC]--[FILTER]--[OPAMP]--->OUT2 | +-[LUT3]--[DAC]--[FILTER]--[OPAMP]--->OUT3 | +-[LUT4]--[DAC]--[FILTER]--[OPAMP]--->OUT4 | +-[LUT5]--[DAC]--[FILTER]--[OPAMP]--->OUT5 | +-[LUT6]--[DAC]--[FILTER]--[OPAMP]--->OUT6 | +-[LUT7]--[DAC]--[FILTER]--[OPAMP]--->OUT7 | +-[LUT8]--[DAC]--[FILTER]--[OPAMP]--->OUT8 JF

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Eeyore 17 years ago

times

delay

time.

SINGLE FREQUENCY at any time.

CLOT !

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Bob Monsen 17 years ago

Can this scheme give a wideband phase shift?

One way to do a wideband phase shift is to do an FFT to amplitude/angle in the frequency domain, add something to all the angle points, and then do an inverse FFT back into time domain. That will require lots of processing power, although a dsPIC might be able to do it for audio. A high end dsp chip will definitely be able to handle it for audio. You also might be able to do it with a PC, although there will be some latency there.

Regards, Bob Monsen

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John Fields 17 years ago

No.

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