Does anyone know a way to take an audio signal and output it

[please_post_to_groups]

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

Greetings All

I have one source for an audio signal and would like to send it to 8 different outputs
simultaneously, but would like to be able to change the phase and amplitude of each of the
8 outputs separately.

I was thinking of using 8 small amplifiers (which isn’t cheap) to increase the amplitude
of the 8 output signals but I’m not sure how I can change the phase of each signal separately.
Is there a product on the market that is inexpensive or can someone recommend a circuit
I could build?

I would use an oscilloscope to make sure the phase and amplitude of each of the 8 outputs
is where I would want it.

Example:
Source is a sine wave generated by a laptop

Output 1) starts at 0 degrees
Output 2) starts at 10 degrees out of phase increase amplitude by 1 volt
Output 3) starts at 15 degrees out of phase
Output 4) starts at 40 degrees out of phase
Output 5) starts at 60 degrees out of phase increase amplitude by 3 volts
Output 6) starts at 100 degrees out of phase
Output 7) starts at 120 degrees out of phase
Output 8) starts at 126 degrees out of phase

alt.sci.physics.acoustics,sci.electronics.basics,sci.electronics.misc,rec.audio.misc

Tia
Sal2

 

[John Fields]

On Wed, 12 Nov 2008 19:04:07 GMT, please_post_to_groups
<please_post_to_groups@post_to_groups_please.com> wrote:

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

Greetings All

I have one source for an audio signal and would like to send it to 8 different outputs
simultaneously, but would like to be able to change the phase and amplitude of each of the
8 outputs separately.

I was thinking of using 8 small amplifiers (which isn’t cheap) to increase the amplitude
of the 8 output signals but I’m not sure how I can change the phase of each signal separately.
Is there a product on the market that is inexpensive or can someone recommend a circuit
I could build?

I would use an oscilloscope to make sure the phase and amplitude of each of the 8 outputs
is where I would want it.

Example:
Source is a sine wave generated by a laptop

Output 1) starts at 0 degrees
Output 2) starts at 10 degrees out of phase increase amplitude by 1 volt
Output 3) starts at 15 degrees out of phase
Output 4) starts at 40 degrees out of phase
Output 5) starts at 60 degrees out of phase increase amplitude by 3 volts
Output 6) starts at 100 degrees out of phase
Output 7) starts at 120 degrees out of phase
Output 8) starts at 126 degrees out of phase

---
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

 

[please_post_to_groups]

Thanks for the response

I know ADC is analog to digital converter but what is a LUT?

Can anyone point to an example circuit with real components that may do this or an off the shelf item

Tia sal2

 

[Rich Grise]

On Wed, 12 Nov 2008 21:45:16 +0000, please_post_to_groups wrote:

I know ADC is analog to digital converter but what is a LUT?

Look-up Table.

Cheers!
Rich

 

[John Fields]

On Wed, 12 Nov 2008 13:53:31 -0600, John Fields
<jfields@austininstruments.com> wrote:

On Wed, 12 Nov 2008 19:04:07 GMT, please_post_to_groups
please_post_to_groups@post_to_groups_please.com> wrote:

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

Greetings All

I have one source for an audio signal and would like to send it to 8 different outputs
simultaneously, but would like to be able to change the phase and amplitude of each of the
8 outputs separately.

I was thinking of using 8 small amplifiers (which isn’t cheap) to increase the amplitude
of the 8 output signals but I’m not sure how I can change the phase of each signal separately.
Is there a product on the market that is inexpensive or can someone recommend a circuit
I could build?

I would use an oscilloscope to make sure the phase and amplitude of each of the 8 outputs
is where I would want it.

Example:
Source is a sine wave generated by a laptop

Output 1) starts at 0 degrees
Output 2) starts at 10 degrees out of phase increase amplitude by 1 volt
Output 3) starts at 15 degrees out of phase
Output 4) starts at 40 degrees out of phase
Output 5) starts at 60 degrees out of phase increase amplitude by 3 volts
Output 6) starts at 100 degrees out of phase
Output 7) starts at 120 degrees out of phase
Output 8) starts at 126 degrees out of phase

---
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


---

Aaarrghhh!!!
That won't work.

JF

 

[BobG]

You could use an audio editor like cooledit or goldwave to do this.
Make a wave file, copy it 8 times, run each copy thru the normalizer
to increse/decrease the amplitude as desired, mix them all back
together, play on the pc.

 

[John Fields]

On Wed, 12 Nov 2008 21:45:16 GMT, please_post_to_groups
<please_post_to_groups@post_to_groups_please.com> wrote:

Thanks for the response

I know ADC is analog to digital converter but what is a LUT?

Can anyone point to an example circuit with real components that may do this or an off the shelf item

---
Sorry, the scheme I posted won't work.

What frequency are you talking about and how accurate do you need the
phase delay to be?

JF

 

[Marsh Ray]

On Nov 12, 1:04 pm, please_post_to_groups
<please_post_to_groups@post_to_groups_please.com> wrote:

Does anyone know a way to take an audio signal and output it multiple times
with different amplitude and phases tia sal2
[]
I was thinking of using 8 small amplifiers (which isn’t cheap) to increase the amplitude
of the 8 output signals but I’m not sure how I can change the phase of each signal separately.

You should probably think in terms of little amplifier blocks. There's
a lot of introductory material on the web if you search for 'op amp'.
http://en.wikipedia.org/wiki/Operational_amplifier

If you're building a basic circuit for audio frequencies, these are
dirt cheap. You can get 4 or more on an inexpensive chip.
 

Example:
Source is a sine wave generated by a laptop

If you're using a sound card output, can you output the signal on the
left and right channels, 90 degrees out of phase where it starts? That
will simplify things greatly!

If not, you'll need to generate a 90 degree phase shifted signal from
the source. The simple circuits I'm familiar with are highly frequency
dependent, but some of the wizards on this group may know some tricks.

After you have 0 and 90 degree signals (call them s0 and s90) at equal
amplitudes, you just need seven 2-channel mixers and some
trigonometry. Assuming output amplitutde of 1 V.

Output 1) starts at 0 degrees
You've got that already.

Output 2) starts at 10 degrees out of phase increase amplitude by 1 volt
Mostly s0, with the appropriate amount of s90 to shift phase. Increase

gain on both s0 and s90 to get increase the overall amplitude.

s0 gain = 2*cos(10 deg)
s90 gain = 2*sin(10 deg)

Output 3) starts at 15 degrees out of phase
s0*cos(15 deg) + s90*sin(15 deg)

Output 4) starts at 40 degrees out of phase
s0*cos(40 deg) + s90*sin(40 deg)

Output 5) starts at 60 degrees out of phase increase amplitude by 3 volts
s0*4*cos(60 deg) + s90*4*sin(60 deg)

Output 6) starts at 100 degrees out of phase
Output 7) starts at 120 degrees out of phase
Output 8) starts at 126 degrees out of phase

For phase shifts >90, you calculate it the same, however, be aware
that one or both gains (from sin or cos) are going to be negative.
Depending on how you're programming your mixer/amplifiers, this may
work automatically. Worst case, you just send your two input signals
through unity gain inverting amplifiers (a simple op amp circuit) to
get 180 and 270 degree signals. This makes a total of four inputs to
each of your seven mixers, though no more than two will be nonzero at
any given time.

- Marsh

 

[Andy]

On Wed, 12 Nov 2008 19:04:07 GMT, please_post_to_groups
<please_post_to_groups@post_to_groups_please.com> wrote:

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

Greetings All

I have one source for an audio signal and would like to send it to 8 different outputs
simultaneously, but would like to be able to change the phase and amplitude of each of the
8 outputs separately.

I was thinking of using 8 small amplifiers (which isn’t cheap) to increase the amplitude
of the 8 output signals but I’m not sure how I can change the phase of each signal separately.
Is there a product on the market that is inexpensive or can someone recommend a circuit
I could build?

Low-Cost Audio Delay Line Uses 1-Bit ADC
<http://electronicdesign.com/Articles/Index.cfm?AD=1&ArticleID=8056>

I would use an oscilloscope to make sure the phase and amplitude of each of the 8 outputs
is where I would want it.

Example:
Source is a sine wave generated by a laptop

Output 1) starts at 0 degrees
Output 2) starts at 10 degrees out of phase increase amplitude by 1 volt
Output 3) starts at 15 degrees out of phase
Output 4) starts at 40 degrees out of phase
Output 5) starts at 60 degrees out of phase increase amplitude by 3 volts
Output 6) starts at 100 degrees out of phase
Output 7) starts at 120 degrees out of phase
Output 8) starts at 126 degrees out of phase

alt.sci.physics.acoustics,sci.electronics.basics,sci.electronics.misc,rec.audio.misc

Tia
Sal2

 

[Bob Masta]

On Wed, 12 Nov 2008 19:04:07 GMT,
please_post_to_groups
<please_post_to_groups@post_to_groups_please.com>
wrote:

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

Greetings All

I have one source for an audio signal and would like to send it to 8 different outputs
simultaneously, but would like to be able to change the phase and amplitude of each of the
8 outputs separately.

I was thinking of using 8 small amplifiers (which isn’t cheap) to increase the amplitude
of the 8 output signals but I’m not sure how I can change the phase of each signal separately.
Is there a product on the market that is inexpensive or can someone recommend a circuit
I could build?

I would use an oscilloscope to make sure the phase and amplitude of each of the 8 outputs
is where I would want it.

Example:
Source is a sine wave generated by a laptop

Output 1) starts at 0 degrees
Output 2) starts at 10 degrees out of phase increase amplitude by 1 volt
Output 3) starts at 15 degrees out of phase
Output 4) starts at 40 degrees out of phase
Output 5) starts at 60 degrees out of phase increase amplitude by 3 volts
Output 6) starts at 100 degrees out of phase
Output 7) starts at 120 degrees out of phase
Output 8) starts at 126 degrees out of phase

alt.sci.physics.acoustics,sci.electronics.basics,sci.electronics.misc,rec.audio.misc

Tia
Sal2

If this only has to operate at a single fixed
frequency, this is fairly straightforward. You
can use an "all-pass" filter that shifts phase
without changing level. (Add gain or attenuation
as needed.) The basic circuit uses an op-amp in
what looks sorta like a classic difference amp
configuration, but with the + and - input
resistors tied together. That alone would be a
"do nothing" circuit because the inverting gain
and the non-inverting gain would cancel each other
out at all input frequencies.

However, you make the non-inverting input phase
sensitive by replacing one of the resistors with a
capacitor.

The two non-inverting resistors normally make a
2:1 voltage divider, so if you replace the ground
resistor with a cap you have a low-pass filter
going to the + op-amp input. At low frequencies
the overall gain is unity (+2 from this input, -1
from the inverting input connected to the same
signal). At high frequencies the + input is
grounded so you have a simple inverter with a gain
of -1. At intermediate frequencies you get a
phase shift. You can adjust the phase by
adjusting the RC on the + input. (There is no
need for the R to match the inverting Rs.)

Note that this approach can do what you request,
for a single input frequency, but all the RCs need
to be re-adjusted if the frequency changes.

If you want a scheme that will work for any single
frequency, you can digitally generate the signals
with different phases. The problem is that sound
cards typically have only stereo outputs. (You
can use the signal generator in Daqarta if you
want to experiment with 2 channels... it's free.
Daqarta can actually generate 8 independent data
streams, but they still have to be combined down
to 2 output channels: 4 on the right and 4 on the
left.)

There are sound cards that have multiple outputs
(5.1, 7.1, etc) but typically these only have two
independent channels that you can generate
arbitrary signals with... they produce the other
outputs by processing and combining those two
signals. High-end cards may have independent
channels, but it's hard to tell that from the
docs. (Daqarta currently only handles 2 signal
outputs regardless, so you'd have to write your
own generating code for more than 2.)

If you are handy with microprocessors, the general
approach is to create a circular buffer that holds
one cycle of a sine wave. To generate a
frequency, you output samples from that table.
(To generate twice that frequency, skip every
other sample, etc. ) To generate different
phases, just change the starting point in the
table. You need a microprocessor with 8 DACs for
this project.

If you need to use arbitrary input frequencies
from a single source, you might want to look into
phase locked loops. If you can adjust the lock
phase in a frequency-independent manner (don't
know, haven't tried this), you can have a separate
PLL for each output. But a better approach might
be to use a single PLL to generate a high multiple
of the input frequency that is fed to various
counters, whose outputs are combined via selected
resistors to create a stepped approximation of a
sine wave (which can be easily filtered). To get
the different phases, you would use different
counter arrangements. LOTS of parts to this
approach, however.

If you tell us what your overall application is,
we can probably come up with something simpler.

Best regards,


Bob Masta

DAQARTA v4.51
Data AcQuisition And Real-Time Analysis
www.daqarta.com
Scope, Spectrum, Spectrogram, Sound Level Meter
FREE Signal Generator
Science with your sound card!

 

[Bob Masta]

On Wed, 12 Nov 2008 16:04:04 -0800 (PST), Marsh
Ray <marsh527@gmail.com> wrote:

On Nov 12, 1:04=A0pm, please_post_to_groups
please_post_to_groups@post_to_groups_please.com> wrote:
Does anyone know a way to take an audio signal and output it multiple tim=
es
with different amplitude and phases tia sal2
[]
I was thinking of using 8 small amplifiers (which isn=92t cheap) to incre=
ase the amplitude
of the 8 output signals but I=92m not sure how I can change the phase of =
each signal separately.

You should probably think in terms of little amplifier blocks. There's
a lot of introductory material on the web if you search for 'op amp'.
http://en.wikipedia.org/wiki/Operational_amplifier

If you're building a basic circuit for audio frequencies, these are
dirt cheap. You can get 4 or more on an inexpensive chip.
=A0
[...]
Example:
Source is a sine wave generated by a laptop

If you're using a sound card output, can you output the signal on the
left and right channels, 90 degrees out of phase where it starts? That
will simplify things greatly!

If not, you'll need to generate a 90 degree phase shifted signal from
the source. The simple circuits I'm familiar with are highly frequency
dependent, but some of the wizards on this group may know some tricks.

After you have 0 and 90 degree signals (call them s0 and s90) at equal
amplitudes, you just need seven 2-channel mixers and some
trigonometry. Assuming output amplitutde of 1 V.

Output 1) starts at 0 degrees
You've got that already.

Output 2) starts at 10 degrees out of phase increase amplitude by 1 volt
Mostly s0, with the appropriate amount of s90 to shift phase. Increase
gain on both s0 and s90 to get increase the overall amplitude.

s0 gain =3D 2*cos(10 deg)
s90 gain =3D 2*sin(10 deg)

Output 3) starts at 15 degrees out of phase
s0*cos(15 deg) + s90*sin(15 deg)

Output 4) starts at 40 degrees out of phase
s0*cos(40 deg) + s90*sin(40 deg)

Output 5) starts at 60 degrees out of phase increase amplitude by 3 volts
s0*4*cos(60 deg) + s90*4*sin(60 deg)

Output 6) starts at 100 degrees out of phase
Output 7) starts at 120 degrees out of phase
Output 8) starts at 126 degrees out of phase

For phase shifts >90, you calculate it the same, however, be aware
that one or both gains (from sin or cos) are going to be negative.
Depending on how you're programming your mixer/amplifiers, this may
work automatically. Worst case, you just send your two input signals
through unity gain inverting amplifiers (a simple op amp circuit) to
get 180 and 270 degree signals. This makes a total of four inputs to
each of your seven mixers, though no more than two will be nonzero at
any given time.

- Marsh

This is excellent advice, and is the simplest
solution yet! Since it only requires 2 outputs
from the sound card, the (free) Daqarta signal
generator create the 0 and 90 degree signals with
ease. The beauty of your approach is that once
the various mixer levels are set, it will work
with any arbitrary generated frequency as long as
the phases are maintained at 90 degree separation.
You can even generate a frequency sweep, or
use FM, etc and everything will track.

To the OP: Let me know if you need any advice on
how to set up the signals with Daqarta.

Best regards,


Bob Masta

DAQARTA v4.51
Data AcQuisition And Real-Time Analysis
www.daqarta.com
Scope, Spectrum, Spectrogram, Sound Level Meter
FREE Signal Generator
Science with your sound card!

 

[Eeyore]

please_post_to_groups wrote:

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

Greetings All

I have one source for an audio signal and would like to send it to 8 different outputs
simultaneously, but would like to be able to change the phase and amplitude of each of the
8 outputs separately.

Amplitude is easy. Phase shifters only provide x degrees of shift at one single frequency. That is
inherent in the concept of sound (and other) waves.

Graham

 

[Eeyore]

ggherold@gmail.com wrote:

Glad to see someone suggested the All-pass filter. This is a simple
way to go if you are only working with one frequency at a time...

It is by far the nicest IMHO since it also has a flat frequency response IIRC. I've used one in a
spiral scan radar display where the deflection coils were driven by sine and cosine waveforms and the
ampltude was ramped so as to provide a natural r,theta display.

Of course if you have more than one frequency you can't really define a
unique phase shift.

Indeed.

Graham

 

On Nov 13, 8:36 am, N0S...@daqarta.com (Bob Masta) wrote:

On Wed, 12 Nov 2008 19:04:07 GMT,
please_post_to_groups
please_post_to_groups@post_to_groups_please.com
wrote:





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

Greetings All

I have one source for an audio signal and would like to send it to 8 different outputs
simultaneously, but would like to be able to change the phase and amplitude of each of the
8 outputs separately.  

I was thinking of using 8 small amplifiers (which isn’t cheap) to increase the amplitude
of the 8 output signals but I’m not sure how I can change the phase of each signal separately.  
Is there a product on the market that is inexpensive or can someone recommend a circuit
I could build?

I would use an oscilloscope to make sure the phase and amplitude of each of the 8 outputs
is where I would want it.

Example:
Source is a sine wave generated by a laptop

Output 1) starts at 0 degrees
Output 2) starts at 10 degrees out of phase increase amplitude by 1 volt
Output 3) starts at 15 degrees out of phase
Output 4) starts at 40 degrees out of phase
Output 5) starts at 60 degrees out of phase increase amplitude by 3 volts
Output 6) starts at 100 degrees out of phase
Output 7) starts at 120 degrees out of phase
Output 8) starts at 126 degrees out of phase

alt.sci.physics.acoustics,sci.electronics.basics,sci.electronics.misc,rec.­audio.misc

Tia
Sal2

If this only has to operate at a single fixed
frequency, this is fairly straightforward.  You
can use an "all-pass" filter that shifts phase
without changing level.  (Add gain or attenuation
as needed.)  The basic circuit uses an op-amp in
what looks sorta like a classic difference amp
configuration, but with the + and -  input
resistors tied together.  That alone would be a
"do nothing" circuit because the inverting gain
and the non-inverting gain would cancel each other
out at all input frequencies.  

However, you make the non-inverting input phase
sensitive by replacing one of the resistors with a
capacitor.

The two non-inverting resistors normally make a
2:1 voltage divider, so if you replace the ground
resistor with a cap you have a low-pass filter
going to the + op-amp input.  At low frequencies
the overall gain is unity (+2 from this input, -1
from the inverting input connected to the same
signal).  At high frequencies the + input is
grounded so you have a simple inverter with a gain
of -1.  At intermediate frequencies you get a
phase shift.  You can adjust the phase by
adjusting  the RC on the + input.  (There is no
need for the R to match the inverting Rs.)

Note that this approach can do what you request,
for a single input frequency, but all the RCs need
to be re-adjusted if the frequency changes.

If you want a scheme that will work for any single
frequency, you can digitally generate the signals
with different phases.  The problem is that sound
cards typically have only stereo outputs.  (You
can use the signal generator in Daqarta if you
want to experiment with 2 channels... it's free.
Daqarta can actually generate 8 independent data
streams, but they still have to be combined down
to 2 output channels:  4 on the right and 4 on the
left.)

There are sound cards that have multiple outputs
(5.1, 7.1, etc) but typically these only have two
independent channels that you can generate
arbitrary signals with... they produce the other
outputs by processing and combining those two
signals.  High-end cards may have independent
channels, but it's hard to tell that from the
docs.  (Daqarta currently only handles 2 signal
outputs regardless, so you'd have to write your
own generating code for more than 2.)

If you are handy with microprocessors, the general
approach is to create a circular buffer that holds
one cycle of a sine wave.  To generate a
frequency, you output samples from that table.
(To generate twice that frequency, skip every
other sample, etc.  )  To generate different
phases, just change the starting point in the
table.  You need a microprocessor with 8 DACs for
this project.

If you need to use arbitrary input frequencies
from a single source, you might want to look into
phase locked loops.  If you can adjust the lock
phase in a frequency-independent manner (don't
know, haven't tried this), you can have a separate
PLL for each output.  But a better approach might
be to use a single PLL to generate a high multiple
of the input frequency that is fed to various
counters, whose outputs are combined via selected
resistors to create a stepped approximation of a
sine wave (which can be easily filtered).  To get
the different phases, you would use different
counter arrangements.  LOTS of parts to this
approach, however.

If you tell us what your overall application is,
we can probably come up with something simpler.

Best regards,

Bob Masta

              DAQARTA  v4.51
   Data AcQuisition And Real-Time Analysis
             www.daqarta.com
Scope, Spectrum, Spectrogram, Sound Level Meter
           FREE Signal Generator
        Science with your sound card!- Hide quoted text -

- Show quoted text -

Glad to see someone suggested the All-pass filter. This is a simple
way to go if you are only working with one frequency at a time... Of
course if you have more than one frequency you can't really define a
unique phase shift.

George

 

[John Fields]

On Thu, 13 Nov 2008 20:14:19 +0000, Eeyore
<rabbitsfriendsandrelations@hotmail.com> wrote:

please_post_to_groups wrote:

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

Greetings All

I have one source for an audio signal and would like to send it to 8 different outputs
simultaneously, but would like to be able to change the phase and amplitude of each of the
8 outputs separately.

Amplitude is easy. Phase shifters only provide x degrees of shift at one single frequency. That is
inherent in the concept of sound (and other) waves.

---
No, it isn't. (View in Courier)


Using the digital system which I described earlier but with a
high-frequency clock substituted for the audio input signal:

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

will ensure that the phase relationships between _all_ of the output
signals will remain constant regardless of the frequency of the clock.

If he had to use his analog output as an input to the system I think
this would work to keep the phase relationships of all of the outputs
constant regardless of the long-term frequency of ACIN:


ACIN>-+-------------------------------------->OUT1
|
[ZCD]
|
+-------+
| |
[PLL] |
| [RESET]
[1024ACIN] |
| |
[COUNT]----+
|
+-[LUT1]--[DAC]--[LPFILTER]--[OPAMP]--->OUT2
|
+-[LUT2]--[DAC]--[LPFILTER]--[OPAMP]--->OUT3
|
+-[LUT3]--[DAC]--[LPFILTER]--[OPAMP]--->OUT4
|
+-[LUT4]--[DAC]--[LPFILTER]--[OPAMP]--->OUT5
|
+-[LUT5]--[DAC]--[LPFILTER]--[OPAMP]--->OUT6
|
+-[LUT6]--[DAC]--[LPFILTER]--[OPAMP]--->OUT7
|
+-[LUT7]--[DAC]--[LPFILTER]--[OPAMP]--->OUT8


JF

 

[John Fields]

On Thu, 13 Nov 2008 21:25:13 +0000, Eeyore
<rabbitsfriendsandrelations@hotmail.com> wrote:

ggherold@gmail.com wrote:

Glad to see someone suggested the All-pass filter. This is a simple
way to go if you are only working with one frequency at a time...

It is by far the nicest IMHO since it also has a flat frequency response IIRC. I've used one in a
spiral scan radar display where the deflection coils were driven by sine and cosine waveforms and the
ampltude was ramped so as to provide a natural r,theta display.


Of course if you have more than one frequency you can't really define a
unique phase shift.

Indeed.

---
Only in your lonely little only analog world...

BTW, how'd you like my little AB final from a few weeks ago?

You (and Kevin of "We amp designers" fame never commented on it, so I
guess it dragged your dicks in the dirt, eh?


JF

 

[Eeyore]

John Fields wrote:

Eeyore <rabbitsfriendsandrelations@hotmail.com> wrote:
ggherold@gmail.com wrote:

Glad to see someone suggested the All-pass filter. This is a simple
way to go if you are only working with one frequency at a time...

It is by far the nicest IMHO since it also has a flat frequency response IIRC. I've used one in a
spiral scan radar display where the deflection coils were driven by sine and cosine waveforms and the
ampltude was ramped so as to provide a natural r,theta display.

Of course if you have more than one frequency you can't really define a
unique phase shift.

Indeed.

---
Only in your lonely little only analog world...

BTW, how'd you like my little AB final from a few weeks ago?

You (and Kevin of "We amp designers" fame never commented on it, so I
guess it dragged your dicks in the dirt, eh?

Your idea of an amplifier is so crap it begs belief. My designs of amplifiers have sold tens of thousands
to satisfied customers.

Here is an example of the most recent range I worked on.
http://cgi.ebay.co.uk/Studiomaster-AX3500-PA-Power-Amp_W0QQitemZ220311114748QQihZ012QQcategoryZ68247QQssPageNameZWDVWQQrdZ1QQcmdZViewItem

You will regularly find products I designed on ebay.

You ?

Graham

 

[John Fields]

On Thu, 13 Nov 2008 23:58:32 +0000, Eeyore
<rabbitsfriendsandrelations@hotmail.com> wrote:

John Fields wrote:

Eeyore <rabbitsfriendsandrelations@hotmail.com> wrote:
ggherold@gmail.com wrote:

Glad to see someone suggested the All-pass filter. This is a simple
way to go if you are only working with one frequency at a time...

It is by far the nicest IMHO since it also has a flat frequency response IIRC. I've used one in a
spiral scan radar display where the deflection coils were driven by sine and cosine waveforms and the
ampltude was ramped so as to provide a natural r,theta display.

Of course if you have more than one frequency you can't really define a
unique phase shift.

Indeed.

---
Only in your lonely little only analog world...

BTW, how'd you like my little AB final from a few weeks ago?

You (and Kevin of "We amp designers" fame never commented on it, so I
guess it dragged your dicks in the dirt, eh?

Your idea of an amplifier is so crap it begs belief.

---
It's simple, it works, it has you vexed. What more could anyone ask for?
---

My designs of amplifiers have sold tens of thousands
to satisfied customers.

---
Your "designs", I'm sure, were nothing new.

Lifted straight out of the GE transistor manual most likely, or
"borrowed" from some other handy source.
---

Here is an example of the most recent range I worked on.
http://cgi.ebay.co.uk/Studiomaster-AX3500-PA-Power-Amp_W0QQitemZ220311114748QQihZ012QQcategoryZ68247QQssPageNameZWDVWQQrdZ1QQcmdZViewItem

---
BFD; just another audio amp.
---

You will regularly find products I designed on ebay.

You ?

---
Nope, that's not the kind of shit I do.

JF

 

[Eeyore]

John Fields wrote:

Eeyore wrote:

My designs of amplifiers have sold tens of thousands
to satisfied customers.

---
Your "designs", I'm sure, were nothing new.

Lifted straight out of the GE transistor manual most likely, or
"borrowed" from some other handy source.

You haven't a fucking clue you ignorant winder-up. Show me a GE design that delivered 0.0008% THD.

Never had a GE manual anyway. Plus most app note designs have obvious flaws that wouldn't survive in the pro-audio world.

Graham

 

[Eeyore]

John Fields wrote:

BFD; just another audio amp.
---

How many 3.5kW low distortion audio power amps have you designed ?

Graham