[Elecraft] Is DVR audio really getting equalized and compressed?

[N6JW]

Hi Michael:

Thanks for helping clarify some of the confusion.  Unfortunately, you
have perhaps (inadvertently) added some of your own.

Lyle ("the DSP guru") has commented on these questions in several
places.  Perhaps none more clearly as here (from Nov 16, 2010):

> 1.  Does the TX EQ apply to what I record in the DVR, 
>>no 
> or does it apply when the DVR plays back into the TX? 
>>yes 
> 2.  When I play the DVR back, does the monitor signal 
>reflect whatever TX EQ I set? 
>>If fastmon is not enabled, yes. 
> 3.  Is it also conditioned by my RX EQ settings? 
>>no 
> 4.  If I record someone off the air, does my RX EQ settings affect what 
> is recorded? 
>>yes 
> 5.  If I play the recording back to him, is my TX EQ applied to it? 
>>yes 
>>
>>73, 
>>Lyle KK7P 

See--
http://elecraft.365791.n2.nabble.com/DVR-Questions-td5745943.html#a5746002

>From the above, one can now further elaborate on the three original
questions, as follows:

>1.  Does the DVR playback audio really pass through TX EQ and audio 
>compression before being transmitted? 
>
>YES, IT DOES !!!

Correct.

>2.  If so, why does it sound so different from live audio, as I hear it 
>my headphones in TX Test mode? 
>
>See answer 1.

Confusing.  For all practical purposes the DVR output and live audio 
should be indistinguishable, AS LONG AS, you are using the same
mic (and element for those with two) that you used to make the 
recording.  I have confirmed this multiple times in actual on the air
use.  This has also been confirmed by other posters.

>3.  Is there a separate audio gain setting for the DVR output that I'm 
>missing?
>
>No, but maybe it comes up in the future...

Potential for confusion here.  If the question is "TX gain setting, like
mike gain" the answer is no.  But in my experience there is NO need
for such a setting.  Reason being, the DVR produces an exact digital
copy of what your mike produced when recording it; and when playing
back the DVR signal is injected at EXACTLY the same point in the TX
chain that the mike is.  This is why the output should be indistinguishable.

On the other hand, if the original question is asking about the playback 
audio heard in your headphones or speakers (like as is the case with the
monitor audio), then the right (up-to-date) answer is YES.  This feature 
was added back in FW 4.12 [current FW is 4.25 production release, and 
FW 4.31 beta, I believe]  Monitor and DVR playback audio levels are 
independently adjustable.  See Revision Notes for instructions on use.

Hope this helps,

73

John, N6JW



DL5OCD wrote:
> 
> Wow,
> 
> these are very confusing answers. I have had the same question and talked
> to Lyle (the DSP Guru).
> But now to your questions:
> 
> 1.  Does the DVR playback audio really pass through TX EQ and audio 
> compression before being transmitted? 
> 
> YES, IT DOES !!!
> 
> 2.  If so, why does it sound so different from live audio, as I hear it 
> my headphones in TX Test mode? 
> 
> See answer 1.
> 
> 3.  Is there a separate audio gain setting for the DVR output that I'm 
> missing?
> 
> No, but maybe it comes up in the future...
> 
> 73
> Michael
> 

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