Extron Electronics SSP 7.1 User Guide - Manual (Page 71)

PCM Digital Source Format (PCM)
Inputs 1-4 only
Two channel, uncompressed, digital signals are processed through any of the four digital
inputs. The sampling frequency of the digital signal is displayed by the SSP 7.1 Setup and
Control Software.
When the SSP 7.1 detects this source format, both the PCM and 2 CH LEDs are lit.
2-Channel Source Format (2CH)
Analog
Input 5 only
Any balanced or unbalanced stereo signal (or two balanced or unbalanced mono sources) is
accepted. This includes older VCR tape recordings that were labeled as having Dolby 2/0 Pro
Logic audio.
Digital
Inputs 1-4 only
When the SSP 7.1 detects any two channel digital signal (including PCM, Dolby Digital 2/0,
Dolby Digital 2/0 Surround, or DTS 2-Channel) the 2 CH LED is lit.
Sampling Frequency
The following table shows the most common sampling frequencies of digital inputs and the
uses with which they are most often associated.
Sampling
Frequency
(kHz)
Use
32 Used for some cassette recordings, speech, and all other audio where
smaller files are desired, with only slight compromise on sound quality. In the
past, used with products such as NICAMs.
44.1 Audio CD, also commonly used with MPEG-1 audio (VCD, SVCD, MP3).
Adopted from the PCM adaptor using PAL video tapes (294 lines by 3
samples by 50 frames per second).
48 Digital sound used for mini DV, digital TV, DVD, DAT, films and professional
audio.
88.2 Sampling rates used by professional recording equipment when the
destination is CD (multiple of 44.1k Hz).
96 DVD-Audio, some LPCM DVD tracks, DTS 96/24, and DTS 96/24
ES Matrix 6.1 source formats always output this sampling frequency.
SSP 7.1 • Reference Material 65