Specifications

2.81

Applications Manual

Revision 1.11Prism Sound dScope Series III

IEC60958

- A two-channel digital audio interface standard, as provided at the dScope's Digital

Output and Input. Also known as S/PDIF this format is used in consumer applications usually with

an unbalanced phono/RCA copper or TOSLINK optical connection. It carries audio wordlengths up

to 24 bits, plus Valid bit, User bit,

Channel Status

and Parity bit per channel.

IMD

- Intermodulation Distortion. When a signal consists of more than one frequency, a non-linear

device under test will produce the original frequencies plus an infinite number of IMD products,

given by

(a * F1) + (b * F2) + (c * F3) + ...

where (a, b, c) etc. are all possible integer numbers, and (F1, F2, F3) etc. are the frequencies of

the original tones.

Jitter

- Variation in edge-timing of a clock. In audio systems, manifestations are interface jitter and

sampling jitter.

S/PDIF

IEC60958

- (Unit Interval). A UI of an AES3 or

IEC60958

carrier is 1/128 of the frame period, the duration

of a single biphase-mark 'cell', or half a bit period.