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Converting the Sampling Frequency & Digital Audio Format in Real Time 25Converting the Sampling Frequency & Digital Audio Format in Real Time 25Converting the Sampling Frequency & Digital Audio Format in Real Time 25
9 Converting the Sampling Frequency & Digital
Audio Format in Real Time
When transferring digital audio data between equipment, it is sometimes necessary to
convert from one digital audio format to another, say from CD/DAT to AES/EBU, or Y2
to CD/DAT. The CBX-D5 allows you to convert the digital audio format between
CD/DAT, AES/EBU, and Y2 in real time.
Real time means that you don’t actually have to record the digital audio, you just input it
to the CBX-D5, the CBX-D5 converts it, then outputs it for record monitoring.
As well as the digital audio format, the CBX-D5 also allows you to convert from one
sampling frequency to another, say from 44.1kHz to 48kHz or vice versa. Sampling
frequency conversion is useful if you have some DAT tapes, maybe masters, recorded at
48kHz and you want to transfer them directly to a CD disc recorder that will only accept
digital audio data at 44.1kHz.
Digital input and output source, record and playback sampling frequency settings are all
made via the controlling software, so you will need to refer to your Software Manuals. The
diagram below shows the conversion possibilities.
In the system shown below, 48kHz data from DAT recorder No. 1 is fed to the CBX-D5
using the CD/DAT connections. The CBX-D5 converts the sampling frequency to
44.1kHz, then outputs the data to DAT recorder No. 2 via the AES/EBU connections.
NOTE:
In this configuration, SCMS and emphasis information will pass through the
CBX-D5 and will be output unchanged.
CBX-D5
AES/EBU
48, 44.1, 32kHz
Y2
48, 44.1, 32kHz
CD/DAT (SPDIF)
48, 44.1, 32kHz
AES/EBU
48, 44.1kHz
Y2
48, 44.1kHz
CD/DAT (SPDIF)
48, 44.1kHz
AES/EBU OUT
CBX-D5
(48 to 44.1kHz)
DAT
RECORDER
No.2 (44.1kHz)
AES/EBU IN
DAT
RECORDER
No.1 (48kHz)
CD/DAT IN
S/PDIF OUT
REC FREQ = 48kHz
PB FREQ = 44.1kHz