DM100 Dolby Bitstream Analyser
DM100 is a hand-held diagnostic tool that can monitor or generate Dolby Digital, Dolby E, and PCM bitstreams. The unit allows audio systems integrators and service engineers to quickly test the integrity and composition of these signals throughout a facility. The DM100 is intended for use in broadcast, cable, DBS, and postproduction facilities, as well as
DVD mastering and home theater installation.
The DM100 accepts input signals via XLR, BNC, and Toslink connectors. The unit identifies the format of the input signal and activates the appropriate built-in decoder. The decoded analog signal, sent to a standard 1/8-inch stereo headphone jack, can be switched to monitor any two decoded channels, while a small built-in speaker can monitor the sum of any channel pair. A front-panel LCD displays Dolby Digital and Dolby E metadata information. Six front-panel LEDs indicate critical bitstream and system status information.
A set of Dolby Digital, Dolby E, and PCM test bitstreams is stored in internal, nonvolatile RAM, and can be changed in the field via software download. The selected test bitstream is produced simultaneously on all output connectors. The unit can receive and decode an input signal while simultaneously generating a test bitstream. The DM100 also features a passthrough mode that allows modification of the input signal’s AES channel status bits before passing the signal to the output connectors. (The input signal can be monitored simultaneously.)
The DM100 also includes system level tests, such as latency measurements, and the ability to check the clock synchronization between audio and video signals.