[sdiy] Javascript Muse

Gordonjcp gordonjcp at gjcp.net
Wed Sep 6 16:36:39 CEST 2017


On Wed, Sep 06, 2017 at 12:13:28AM -0700, Donald Tillman wrote:
> Yes, exactly.  
> 
> The patent describes a classic DCO function; taking a value proportional to the frequency, adding it to an accumulator each cycle, and ignoring the overflow.
> 
> But a 16-bit add operation is not cheap in 1969 technology.
> 
> So instead, the accumulator is a shift register, looped on itself, with a 1 bit adder, and the frequency value is scanned in 1 bit at a time.
> 
> That's insane.  Yet weirdly practical.
> 
>   -- Don

That's not a bad idea actually, and you could implement it "fast enough"
in a few gates for modern hardware.

-- 
Gordonjcp MM0YEQ




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