Monitor Audio ASW100 User Manual download pdf (Page 219)

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AM700 Audio Measurement Set User Manual

Digital Interface Tester

Use the Digital Interface Tester application to make extensive evaluations of the

electrical and data characteristics of industry standard digital audio interfaces

including AES/EBU, SPDIF (also known as consumer), and optical consumer.

Serial Data. The Digital Interface Tester is used to check the bit stream output of

serial digital devices to look for bit settings, checking the number of bits, and

comparing subframe data bits for differences. The serial data is made up of 32-bit

subframes (two subframes to a frame) of which 20 or 24 bits are used to transmit the

audio information. The remaining bits carry coding of various types. More

information of the coding is provided in the material on Digital Interface

Terminology included at the end of this application.

The Digital Interface Tester gathers 192 samples of the frame bits and displays them

in standardized blocks. These data blocks may be displayed either in binary or

hexadecimal format to examine the bits or bytes individually for their activity or

decoded to provide readable information about the serial digital stream.

Bit Activity Display. Use the Bit Activity display to provide a graphical display of the

statistical activity of all subframe bits. From this display you may determine the

following characteristics of a digital audio signal at a glance: Parity, Validity,

Channel Status and User Bit states, digital audio sample length, and the presence of

stuck bits.

Channel Status Display. Use the Channel Status Block display to examine the

contents of the Channel Status blocks in either raw binary, decoded (English

language), or hexadecimal forms. From this display sources of interface problems

caused by data format or content can be uncovered. You can select the appropriate

decoding format from AES/EBU standards or consumer standards. The AES/EBU

digital audio interface carries an embedded clock signal that is used by receiving

equipment to decode the data on the interface. The receiving equipment usually also

uses this (or a similar) embedded clock signal as a timing reference for synchroniza-

tion purposes.

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Monitor Audio ASW100 User Manual Page 219