DCI Specs - Digital Cinema Initiatives

• Is required to survive camcorder capture and low bit rate compression (e.g.500 Kbps H264, 1.1 Mbps MPEG-1).9.4.6.1.3. Audio Survivability Requirements• Audio Forensic Mark is required be inaudible in critical listening A/B tests.• The embedded signal is required to survive multiple Digital/Analog andAnalog/Digital conversions.• Is required to survive radio frequency or infrared transmissions within thetheater.• Is required to survive any combination of captured channels.• Is required to survive resampling and down conversion of channels.• Is required to survive time compression/expansion with pitch shift and pitchpreserved.• Is required to survive linear speed changes within 10% and pitch-invarianttime scaling within 4%.• Is required to survive data reduction coding.• Is required to survive nonlinear amplitude compression.• Is required to survive additive or multiplicative noise.• Is required to survive frequency response distortion such as equalization.• Is required to survive addition of echo.• Is required to survive band-pass filtering.• Is required to survive flutter and wow.• Is required to survive overdubbing.9.4.6.2. Forensic Marking OperationsThere may be differing circumstances surrounding the desire by a Rights Owner toforensically mark content. To accommodate these variations, it is necessary to be ableto independently control the activation of both the audio and the image Forensic Marking(FM). The following rules shall be normative for Forensic Marking operations:1. The SM shall be solely responsible for control of FM marking processes (i.e.,“on/off”) for the auditorium it is installed in, and, subject to item 2 below,command and control of this function shall be only via the KDM indicator per item3 below.2. Forensic Marking shall not be applied to non-encrypted audio or image content. Ifportions of a composition are encrypted and other portions are not, FM shall notbe applied to those Track Files that are not encrypted.3. Forensic Marking shall otherwise be applied to all encrypted content, except asfollows:a. The “no FM mark” state shall be commanded by the'ForensicMarkFlagList' element of the KDM.DCI Digital Cinema System Specification v.1.2 Page 128