Pcm DigItal Source Format (Pcm; 2-Channel Source Format (2Ch; Analog; Digital - Extron electronics SSP 7.1 User Manual

Listening modes that extend DTS Digital Surround or DTS-ES Matrix 6.1, such
as DTS + Pro Logic IIx Music or DTS + Pro Logic IIx Movie, will also output
96 kHz/24 bit signals for the rear channels.
Material encoded in the DTS-ES Discrete 6.1 format cannot carry DTS 96/24
information because of bandwidth limitations as a result of the discretely encoded
surround back channel information.
When the SSP 7.1 detects DTS source material with the DTS 96/24 feature, the
sampling frequency of the signal is displayed by the SSP 7.1 Setup and Control
Software. The SSP 7.1 Setup and Control Software also changes the text associated
with the Listening Modes to reflect that DTS 96/24 is being output.
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) are 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 (multiples of 44.1k Hz).
DVD-Audio, some LPCM DVD tracks, DTS 96/24, and DTS
96/24 ES Matrix 6.1 source formats will always output this
sampling frequency.
SSP 7.1 • Reference Material B-5