I have no idea what a zlp interface is.
If the other program -- I guess that's jt65-hf-hb9hqx? -- can't read a
wav file, it's impossible to ensure that the decoders in two programs
are in fact operating on the same data.
WSJT-X does not want "anything better" than 48000 Hz sample rate. What
it particularly does NOT want is data that have been sampled (or
possibly resampled) at some other rate such as 44100 Hz and then
resampled (maybe again? ) to 48000 Hz.
-- Joe, K1JT
On 9/16/2015 4:59 PM, Bill Somerville wrote:
> On 16/09/2015 21:50, Richard Stanley wrote:
> Hi Richard,
>> My sample rate is
>> 1 channel 16 bit 48000 Hz
>>
>> This is the interface built into the IC-7100
>> I do have a spare zlp interface so will get it out tomorrow and run the
>> jt65-hf-hb9hqx from that and wsjt-x from the built in interface, this way it
>> will be different soundcard interfaces with the same radio.
>> I can run on 2 different computers but as the jt65 variant decodes at 42.3
>> it is finished before wsjt-x even starts to decode.
>> Do you want me to leave the zlp interface at it's default settings or set as
>> the built in unit at 48000Hz ?.
> I believe the JT65-HF applications use an 11.025kHz sample rate so setting the
> interface for that to 44.1kHz should be optimal as a divide by exactly four
> down
> conversion is trivial.
>
> Thanks for trying this, I think it may be enlightening. Also you could try the
> different options on the rig CODEC driver in the advanced properties if it has
> them, something like:
>
>
>
> all combinations the exclusive mode settings.
>
> I would also be interested if starting WSJT-X before JT65-HB9HQX has any
> apparent effect.
>>
>> Richard m0clz
> 73
> Bill
> G4WJS.
>>
>>
>> -----Original Message-----
>> From: Bill Somerville
>> Sent: Wednesday, September 16, 2015 9:32 PM
>> To:wsjt-devel@lists.sourceforge.net
>> Subject: Re: [wsjt-devel] WSJT-X JT65A Decode performance
>>
>> On 16/09/2015 21:22, Joe Taylor wrote:
>>> Bill --
>> Hi Joe,
>>> My experience is that most claims that"program X" decodes JT65 better
>>> than WSJT (or WSJT-X) are the result of using wrong soundcard sample
>>> rates. I seem to remember that JT65-HF doesn't read (or write) *.wav
>>> files, so it's very hard to do a real comparison of the decoders. I
>>> suspect there may be a sample-rate issue, but that's only a guess.
>> That's my suspicion too and knowing that the Windows sample rate
>> conversion capability has been pretty poor in older versions makes me
>> think that this may be related to that. I have no idea how each version
>> of Windows deals with two applications asking for different sample rate
>> streams from the same input device. I would hope that each device is run
>> at the specified default sample rate and all streams are derived from
>> that converting rate if necessary. OTOH there are usually options in the
>> driver advanced properties about exclusive access that imply there can
>> be a first come first served (at the requested sample rate) basis. So
>> the order of starting applications might be a factor.
>>
>> This would mean that verifying this would require two separate systems
>> taking analog audio from a single receiver or perhaps a system with two
>> sound cards.
>>> -- Joe
>> 73
>> Bill
>> G4WJS.
>>>
>>> On 9/16/2015 4:01 PM, Bill Somerville wrote:
>>>> On 16/09/2015 20:53, Bill Somerville wrote:
>>>>> I don't have the full decode lists for those but the OMs that sent them
>>>>> can easily capture more examples so I will ask for the full list of
>>>>> decodes from both applications with some new examples.
>>>> Looking at the files above, I doubt there are any other decodes apart
>>>> from the ones that WSJT-X gets as they are all on the last dregs of a
>>>> closing 15m band.
>>>>
>>>> 73
>>>> Bill
>>>> G4WJS.
>
>
>
>
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