DK Digital CDB-600 Dokumentacja Pobierz pdf (Strona 36)

Chapter 9 Utility Functions. PRELIMINARY Release MSD Software Manual.

9.2.1 Calibrating the Leq(m). 

Since Leq(m) is an acoustically measured level (using a microphone at the

optimal listening position in a cinema) and the MSD measures the Leq(m) level

electrically, the 'Graphic Loudness Meter' in the MSD has to be calibrated to

the output level from the mixing console.

When the output level from the mixing console has been adjusted to the correct

level, the 'Graphic Loudness Meter' in the MSD can now be calibrated. In order

to do this, the MSD write protection has to be disabled before selecting the

'Graphic Loudness Meter'. Please see section 3,4 for information on how to

disable the MSD write protection.

In a normal 5.1 surround setup the Left, Center and Right channels are

calibrated to 85dB, at 1 KHz and the Left Surround and Right Surround

channels are calibrated to 82 dB at 1 KHz. The LFE channel are calibrated to

85 dB at 100 Hz.

The Leq(m) calibration menu.

To calibrate the input channels apply a 1 KHz signal at a calibrated level that

corresponds to 82dB or 85dB. Use the [] / [] keys at the right of the

[CALIBRAT] key to select which channel to calibrate. The reference level is

selected by the rightmost key in the calibration menu. Select either 'LEV 82' or

'LEV85' for the surround channels and 'LFE 85' for the LFE channel. Please

note that the LFE channel must be calibrated at 100 Hz and only one channel

can be selected as a LFE channel.

Press [CALIBRAT] to start the calibration of the selected input channel. When

the calibration is in progress the Leq(m) value will turn white and when the

calibration has finished the Leq(m) value turns yellow. This procedure has to be

completed for all the input channels for a selected preset.

Use the [] / [] at the right of the [TRIP] key to set the trip level. If the

Leq(m) value is above the trip level when a loudness session is ended the

counter and the Leq(m) value starts blinking red.

The calibration and trip levels can be stored in the presets. The levels are local

to each preset which means that the levels can be different for each preset.

Please see section 4.2 for information on saving a preset.

9.2.2 Using the Leq(m).  

Since loudness is measured over time it is very important that the session is

started and stopped at exactly the same time every time the audio clip is

played.

Press the [START] key to start a new loudness session. When a loudness

session is in progress the counter in the top right corner of the screen will start

counting. Press [STOP] to end the loudness session.

During a loudness session two graphs will be drawn, one for the Leq(m) value

and one for the sum of the input channels. After about 3 minutes the graphs will

reach the edge of the window and two new graphs will be drawn and the old

informations will therefore be discarded. (Only the graph informations, not the

overall Leq(m) value.) The default colours of the two graphs is green and

yellow but these colours can be changed using the Windows® program DK-

Matrix. Please refer to the DK-Matrix manual for further details.

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