[time-nuts] New WWVB modulation format receivers (NOT)

[Bob Camp]

Hi

Part of the typical receiving process is reducing the bandwidth. With a smaller bandwidth you can get away with a lower sample rate without loosing useful information. The normal approach is to drop the sample rate as you move through the system. 

When you drop the sample rate (say 4:1) you have some “extra” bits lying around. You could just throw them away. You also could keep them. Depending on what’s going on, you could get two more bits out of the process. 

Bob

On Feb 21, 2014, at 12:35 AM, Hal Murray <hmurray at megapathdsl.net> wrote:

> 
> jimlux at earthlink.net said:
>> I sample at 100 kHz with 16 bits on a teensy3.. 
> 
> Neat.  Thanks.  How many effective bits?  (when the input signal is 60 KHz it 
> that matters)
> 
> 
> Can somebody give me a lesson in the tradeoffs between number of bits and 
> sampling rate?
> 
> I know of one special case.  If your ADC is only 1 bit, you don't have to 
> worry about AGC.
> 
> 
> -- 
> These are my opinions.  I hate spam.
> 
> 
> 
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