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 dspBox
- riaa und mehr -









Neben den typischen Anwendungen zur Raumanpassung oder aktiver Filterung kann man den dsp auch benutzen um ältere Schallplatten nachzuentzerren.
Vor der Einigung auf die RIAA-Entzerrung im Jahre 1955 waren auch andere Kennlinien verbreitet. Heutige Phonoentzerrer lassen sich in der Regel nicht auf diese alten Entzerrungen umstellen. Abhilfe kann die Nachentzerrung mit dem dsp schaffen. Das Signal vom Phonoentzerrer wird dabei einmal durch die dspBox geleitet und erst dann in den Verstärker eingespeist.
Die hier hinterlegten dsp-Konfigurationen enthalten die Nachentzerrungen. Der dsp muss dabei nur die Differenz zwischen RIAA und den älteren Kennlinien entzerren.

Kennlinien nach http://www.vinylengine.com/cartridge_database_record_equalization.php

Link Beschreibung
 Old European Characteristic: "250"
 Old European Characteristic: "500"
 Columbia N78
 Columbia LP M33
 NAB National Association of Broadcasters
 NARTB National Association of Radio and TV Broadcasters
 AES Audio Engineering Society
 London Gramophone Corporation
 CCIR Recommendation No. 134
 IEC
 RCA Victor & IEC No.98
 TELDEC


1) Old European Characteristic: "250"
HMV N78 (His Masters Voice) and Columbia N78 produced by E.M.I. England. CETRA N78, Italy. This standard may be also applied to records by Parlophone, Brunswick
Time Constant: 636 µs (250 Hz).

2) Old European Characteristic: "500"
Applicable to many European records produced before 1950, and also to many U.S. companies except RCA Victor, Columbia.
Time Constant: 318 µs (500 Hz).

3) Columbia N78
Time Constants: 530 µs (300 Hz) and 100 µs (1,590 Hz).

4) Columbia LP M33
HMV M33, produced in England. Vanguard, Bach Guild, Cetra M33, Vox.
Time Constants: 1,590 µs (100 Hz), 318 µs (500 Hz), and 100 µs (1,590 Hz).

5) NAB National Association of Broadcasters
Time Constants: 530 µs (300 Hz) and 100 µs (1,590 Hz).

6) NARTB National Association of Radio and TV Broadcasters
has replaced NAB standard. Applicable to Artist, Capitol, MGM, Westminster (see disk cover), Tempo M33 (approximate char.)
Time Constants: 2,720 µs (60 Hz), 318 µs (500 Hz), and 100 µs (1,590 Hz).

7) AES Audio Engineering Society, made in 1951 this reproduction definition for compatibility to standards mostly used in the USA.
Time Constants: 398 µs (400 Hz) and 64 µs (2,500 Hz).

8) London Gramophone Corporation
London M33 & M45,Decca (possibly).
Time Constants: 1,590 µs (100 Hz), 318 µs (500 Hz), and 57 µs (2,800 Hz).

9) CCIR Recommendation No. 134
by VIIth Plenary Assembly, 1953: Germany 1952-1955: DGG 33 1/3 LP.
Time Constants: 450 µs (350 Hz), and 50 µs (3,180 Hz).

10) IEC
A recommendation of 1955 for playing N78 disks, according to B.S. No. 128 (British Standard).
Time Constants: 3180 µs (50 Hz), 450 µs (350 Hz), and 50 µs (3,180 Hz).

11) RCA Victor & IEC No.98
refers to this "New Orthophonic" standard since 1952. Recommendation of 1953 by NARTB, of 1955 by IEC No.98, and B.S. No. 128. World standard since 1967.
Time Constants: 3180 µs (50 Hz), 318 µs (500 Hz), and 75 µs (2,120 Hz).

12) TELDEC
Telefunken and Decca founded a record company that used a characteristic proposed for German DIN-Standard on July 1957: DIN45533, DIN45536, DIN45537.
Time Constants: 3180 µs (50 Hz), 318 µs (500 Hz), and 50 µs (3,180 Hz).


Weitere Kennlinien nach http://www.gspaudio.co.uk/78rpm-riaa-equalization.htm

Link LPs und Singles
 Old LP's and Singles - Early FFRR (pre '53)
 Old LP's and Singles - FFRR (Decca_London), MGM, EMI, HMV, RCA Victor, English Columbia
 Old LP's and Singles - NAB (NARTB), American Columbia


Link 78 rpm
 78rpm - Brunswick, Parlophone
 78rpm - Capitol, Early Decca, Mercury
 78rpm - Columbia (American 1925 onward), FFRR, Victor (1925 onward_some)
 78rpm - Columbia (American 1938 onward)
 78rpm - Columbia (English), EMI, HMV
 78rpm - MGM, Victor (1947 onward)
 78rpm - Victor (1925 onward_some)
 78rpm - Victor (1925 onward_some, and 1938-47)










 
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