Pcm Digital Source Format (Pcm); 2-Channel Source Format (2Ch); Sampling Frequency - Extron electronics SSP 7.1 User Manual

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)
32
44.1
48
88.2
96
Use
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.
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).
Digital sound used for mini DV, digital TV, DVD, DAT, films
and professional audio.
Sampling rates used by professional recording equipment
when the destination is CD (multiple of 44.1k Hz).
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