[sdiy] Ring Mod (was Re: Hadamard Transform Network)

[Richie Burnett]

It comes from trig identities.

In practice the resulting spectrum is a lot more complex than just sum and difference frequencies though for inputs that are more complicated than basic sinewaves.

Then there is also distortion inherent in a true diode ring modulator.

-Richie, 

Sent from my Xperia SP on O2

---- Tim Ressel wrote ----

>'Ring mod' is easier to type than 'Four Quadrant Multiplier', and unless 
>you're talking specifics, everyone will know what you mean. Xerox 
>bristles every time someone refers to copying as 'Xeroxing' but it has 
>become a universal term.
>
>But you bring up an interesting point: 4QMs multiply, but they produce 
>x+y, x-y tones. Anyone got the math on that?
>
>--tr
>
>
>On 5/16/2017 6:12 AM, Tom Wiltshire wrote:
>> Let me summarise from last time we had this conversation: strictly 4-quadrant multipliers aren't "ring mods", but many people use "ring mod" universally to apply to both. This is either sloppy and incorrect usage, or a widening of the definition of the term depending on your point of view.
>>
>>
>> On 16 May 2017, at 13:59, mskala at ansuz.sooke.bc.ca wrote:
>>
>>> On Tue, 16 May 2017, Mattias Rickardsson wrote:
>>>> On 15 May 2017 at 19:49, Tim Ressel <timr at circuitabbey.com> wrote:
>>>>> whenever you make a bell sound with a ring mod .. that's multiplicative.
>>>> Not exactly, if it's a real ring modulator... which is a switching device.
>>> It's still multiplying, just multiplying with a square wave.
>>>
>>>> But a balanced modulator (4-quadrant multiplier ("ringmod")) is purely
>>>> multiplicative. :-)
>>> In radio work the term "balanced modulator" very often means a diode ring.
>>>
>>> -- 
>>> Matthew Skala
>>> mskala at ansuz.sooke.bc.ca                 People before principles.
>>> http://ansuz.sooke.bc.ca/
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>
>-- 
>--Tim Ressel
>Circuit Abbey
>timr at circuitabbey.com
>
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