Print

Print


Hi, Andrew,

Yes there will be changes, but they are not huge and the slope is gentle 
(less so with AME). Look at www.mrltapes.com and look at the Choosing 
and Using a test tape document -- there are cross references between 
standards for applying a calibration tape of one standard to another.

Cheers,

Richard

On 2011-01-29 3:23 AM, Andrew Hamilton wrote:
> On Jan 28, 2011, at 10:12 PM, Richard L. Hess wrote:
>
>> ...One of my clients likes it that we can pitch the tapes for him in 
>> the analog domain.
>>
>
>
> Dear Mr. Hess, et al.,
>
>      I was wondering how much speed tolerance there is to a given 
> pre-/de-emphasis EQ, even if a vari-speed oscillator is available.    
> Say there is a 1 kHz tone at 990 Hz, and you know they had intended 
> the EQ to be NAB...   Had the horse already left the barn (in terms of 
> the emphasis's efficacy) when they were signaling a 1k sine, but the 
> machine was turning a bit faster than 15 ips (say, 15.2 ips)  and 
> turned the 1000 cycles per second into 990 cps when played back at the 
> intended record speed?   Or, by speeding up the playback machine to 
> 15.2 ips - enough to make the intended 1k tone actually play 1000 cps 
> - does the vari-sped playback (at the original record speed) magically 
> de-emphasize the haunted pre-emphasis?  What is the point at which an 
> alteration should be made to the pre- and/or de-emphasis EQ?  
> (Obviously, if the recorder is turning at 20 ips or higher, a 
> different emphasis eq has to be set, whence the custom curves - let 
> alone AES and AME.)
>
>
> Thank you,
>      Andrew
>

-- 
Richard L. Hess                   email: [log in to unmask]
Aurora, Ontario, Canada           (905) 713 6733     1-877-TAPE-FIX
http://www.richardhess.com/tape/contact.htm
Quality tape transfers -- even from hard-to-play tapes.