That's the way *I* do it. Although in fact, it IS measured that way, simply not stated by that clot P.B. else the power into 2 ohms x 2 wouldn't be identical to the bridged power into 4 ohms. Which it is.
Don't know much about audio do you ?
Graham
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
41 Replies
You're one to talk since you have misinterpreted every single power figure in those specs.
Graham
I cut my teeth on audio, and decided there were better things to do than
to follow it blindly for the rest of my life.
You, obviously, decided differently.
The point, which you seem to keep missing, is that THD was measured
under conditions which were optimum instead of, as I\'d have done,
measured it with one channel operating fully loaded, both channels fully
loaded, and bridged, fully loaded, and published the results.
JF
--- That has nothing to do with wanting to fight.
All I did was misread a sentence or two and admit to the error when it was brought up by Phil.
Interestingly, you both seem to think that admitting to an error is an Achilles' heel of some kind and are loath to do it because you think it puts you in a position of weakness.
Even more interesting is that you don't seem to realize that refusing to acknowledge an error, when it's as plain as the nose on your face, makes you look disingenuous and sullies your credibility.
JF
That's easy, if you already know how to do it with a pencil & paper. :-)
--
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What error ?
Graham
not
to
No, the very reverse.
We only bother with both channels fully loaded. It's the pro-audio industry norm.
How long do you want the data sheet to be ? Users aren't interested in THAT much gubbins. Suggest you read a few equivalent data sheets from other manufacturers in the same business.
Graham
Me neither.
I have innovated in audio.
Graham
"John Fields"
** I posted a reply.You stupid autistic cretin.
...... Phil
Got any patents?
JF
It's been too long since I have done a ny digital design, but, as delay lines work, one needs to send an analog waveform, digitized in amplitude to a sing-around circuit with 8 taps at the selected phase points, each tap being the appropriate output. The sine wave remains conntained in the sing-sround circuit. The frequency is determined by the clock speed of the sing-around circuit.
Angelo Campanella
The companies I've worked for have generally preferred commercial confidentiality plus you know how difficult it is to patent a circuit under the 'obvious use' or 'derivative' clauses.
I do have several patentable ideas in mind though. Both totally unrelated to audio. Was thinking about one of them earlier today. Oh and (nearly forgot) one audio one related to louspeakers.
Graham
Which would therefore still only work at a unique single frequency at any one time.
Graham
I thought I smelt something from over the pond.
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Who cares what Lou speaks about?
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I do?
time.
But as I said, the clock rate of the shift register must be variable so as to set the sine wave frequency. The way I see it, one generates, say, an eight bit word constituting a full wave that is sent into the clocked shift register that loops back to itself. The register is long, with eight parallel-bit(8) output taps, each capable of reading the 8 bit word in parallel, to be summed by a D to A converter to output an analog sine voltage, which becomes the driver for that channel. The clock rate for the looped shift register needs to be variable, so that your system can set the frequency it needs.
Angelo Campanella
delay
time.
Duh, but if the clock frequency changes it\'ll still work at that new
frequency and the phase relationship between the various outputs will
remain constant.
JF
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
times
delay
time.
SINGLE FREQUENCY at any time.
CLOT !
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