[AMRadio] Speech Processing

[donroden at hiwaay.net]

Here are your steep skirt band passes before your processing.

https://www.sotabeams.co.uk/variable-bandwidth-filter-modules-ssb-cw/

Watch the video and the steep skirts


I'd run each into one section of a Behringer MDX4600 MULTICOM PRO-XL

which is a 4 Channel Compressor/Limiter and Peak Limiter.


One of the Behringer channels could be used as the input buffer to the  
modules, or as a final output driver.



Don  W4DNR



Quoting W2xj <W2xj at w2xj.net>:
> Hey Jim
>
> Interesting design. For the next go round may I suggest:
>
> A 2 or 3 band design. Not the typical broadcast style intended for  
> music but one based on speech formants. A two band would have a  
> crossover at 1500 hertz and a three band would have bands 1000 hertz  
> and below, 100 to 2000 hertz and 2000 to 4000 hertz. Each band would  
> have it’s own clipper before re-combination.
>
> A final clipper more suitable for AM or SSB would be a Hilbert  
> transform clipper. It will not overshoot on SSB rigs and is less  
> susceptible to the overshoots caused by filters in AM rigs. Rockwell  
> Collins used that design for military rigs going back to the 80s.
>
> Sent from my iPad
>
>> On Sep 25, 2018, at 3:06 PM, Jim Tonne <Tonne at Comcast.net> wrote:
>>
>> OK guys, things do indeed seem to have been slow
>> but I am offering a topic to get stuff moving.  A favorite
>> topic of mine is speech processing.  By that I mean
>> contraptions that "ride gain" on your microphone signal
>> to maximize modulation, or at least even it out.  Are any
>> of you out there interested in discussing that subject?
>> I am not interested in and don't want to get involved with
>> existing commercial units.  Rather let's focus on new
>> stuff.  I have been working on new designs and would
>> like to get them out in the field for testing.  Having recently
>> moved (seriously downsized) I no longer have lab or
>> shop facilities and now have to rely on feedback from
>> the field to confirm design validity.  The results are to be
>> released to the public so we'll all benefit.  Open source,
>> as it were.  Design using LTspice and hand off to others
>> for proofing.
>>
>> The Sep/Oct issue of QEX has my latest writing on this
>> subject.
>>
>> Or you can go to
>> http://tonnesoftware.com/miscellany.html
>>
>> and scroll down to
>> "Speech Processor Article As Published"
>>
>> or scroll down to
>> "Speech Processor Talk"
>>
>> If you are technically-inclined here is your opportunity to
>> jump on the bandwagon and contribute to the state of the
>> art !!
>>
>> There - that ought to make this group stir to life  :-)
>>
>> - Jim Tonne W4ENE
>>
>>
>>
>> ---
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