dlmanley at sonic.net
Wed Sep 6 17:18:58 CEST 2017
On September 6, 2017 7:36:39 AM PDT, Gordonjcp <gordonjcp at gjcp.net> wrote:
>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
>> That's insane. Yet weirdly practical.
>> -- Don
>That's not a bad idea actually, and you could implement it "fast
>in a few gates for modern hardware.
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