Audio data

The audio data is available via the LDC as an ECorpus (audio data order number LDC2004E01, transcriptions order number LDC2004E02 ). Please contact the LDC to obtain the data.

All commercial mics were collected at a 48Khz/24-bit sampling resolution. The data was SPHERE-encoded, down-sampled to 16KHz/16-bit and gain-normalized for distribution.

Video data

The video data is extracted from a NIST-internal format and is then encoded using the MPEG-2 standard in NTSC format using the following parameters:

1. 720x480 resolution (NTSC based/29.97 fps)
2. Main Profile / Main Level
3. 4500 bits/seconds
4. Default quantization tables as defined by ISO/IEC 13818-2.
5. 4:2:0 chrominance format. Chrominance channels are each subsampled half in horizontal and vertical directions.
6. Uses a GOP sequence of I, P and B frames of length 15 as follows: IBBPBBPBBPBBPBB IBBPBBPBBPBBPBB ...
7. Two audio channels are added to help with understanding the data: the left channel is a gain-normalized mix of all the head microphones and the right channel is a gain-normalized mix of all the distant microphones. Both channels are encoded at 256 kbps, 44.1 kHz using the MPEG-1 layer II format.

Data samples

This section contains audio and video samples of actual meeting recordings. These samples are encoded for playback using the MPEG-4 format for the video and MPEG-1 Layer 3 (MP3) format for the audio. Note that the format used for research will be different and will be specified on this page once it is finalized.

Audio Recording Samples

• Table mounted microphone number 1
• Table mounted microphone number 2
• Speaker 1: Head mounted microphone
• Speaker 1: Lapel mounted microphone

Video Recording Samples

You can play these samples with Quicktime 6 on Windows and Mac OS. On Linux, either VLC or MPlayer should play the video.

Excerpt showing the different camera views

Excerpt of a news gathering meeting

Excerpt of a meeting with an office design expert

Excerpt of a staff meeting

 

 

Page Created: September 19, 2007r
Last Updated: December 19, 2007