Bob Scott
New Member
NARTB, RIAA, Ffrr, FM de-emphasis curves etc.
Would anyone have links to (obsolete) standards, in particular industry standard preemphasis/deemphasis curves for vinyl and tape recording.
I already have the RIAA curve. I would like to know what the last deemphasis standards were for tape recording at various speeds from 15/16 ips to 15 ips, mono and/or stereo including compact cassete. Each speed had its own response curve.
I know FM deemphasis is 75uS (2122 Hz) in North America and 50uS (3183 Hz) in Europe. How about UK? Also, amateur radio FM transmissions also use pre/deemphasis. Does anyone know that/those standard(s)? Or a link?
I am also interested in FFRR deemphasis curve for older 33-1/3 UK LPs. A long time ago I had a Rolling Stones LP with "FFRR" printed on the cover. Played back on a RIAA preamp, it sounded like it had bass boost.
It seems to be almost impossible to find this information on the internet. I had to get the RIAA information from a TI op-amp datasheet.
Lastly, does anyone know who manufactures LP recording equipment. This technology is making a resurgence. I sure would like to see the schematic diagram of the typical industry RIAA preemphasis encoder.
Thanks,
Bob
Would anyone have links to (obsolete) standards, in particular industry standard preemphasis/deemphasis curves for vinyl and tape recording.
I already have the RIAA curve. I would like to know what the last deemphasis standards were for tape recording at various speeds from 15/16 ips to 15 ips, mono and/or stereo including compact cassete. Each speed had its own response curve.
I know FM deemphasis is 75uS (2122 Hz) in North America and 50uS (3183 Hz) in Europe. How about UK? Also, amateur radio FM transmissions also use pre/deemphasis. Does anyone know that/those standard(s)? Or a link?
I am also interested in FFRR deemphasis curve for older 33-1/3 UK LPs. A long time ago I had a Rolling Stones LP with "FFRR" printed on the cover. Played back on a RIAA preamp, it sounded like it had bass boost.
It seems to be almost impossible to find this information on the internet. I had to get the RIAA information from a TI op-amp datasheet.
Lastly, does anyone know who manufactures LP recording equipment. This technology is making a resurgence. I sure would like to see the schematic diagram of the typical industry RIAA preemphasis encoder.
Thanks,
Bob
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