Outline of product

When we watch TV, audio level of program is sometimes too low.  Then, I make volume bigger by remote control.  However, the following commercial program suddenly makes much bigger audio level. That happens because digital broadcasting did not have any regulation to control audio loudness.
Since digital broadcasting has started, audio loudness for TV viewer has been a critical issue. To solve the problem, ITU recommended loudness regulation by ITU BS1770-2 and that has resulted in T032 regulated by JBA, The Japan commercial Broadcasters Association. This regulation will make all broadcasting material’s audio loudness for human beings similar level as below target, no matter how and from where audio material is originally delivered.
Average loudness level: -24LKFS+/-1dB
Lowest loudness level: -28 LKFS
5.1ch surround: -22 LKFS
Due to the situation mentioned as above, loudness meter became inevitable requirement for all broadcasting studio and post production.
Loudness meter/audio monitor, AM-3805 supports
-ARIB TR-B32
-Display mode as short term (measuring period adjustable), integrated (continuous measurement) and true peak meter
-Measurement mode as stereo, surround and loudness history
-System configuration with PC for higher level analysis
Following modes are prepared for measurement period.
-Momentary 400ms
-Short term 0.4 and 1 to 10sec by 1 second step
-Integrated Whole period of the program (after gating process)
Front(push image for zoom) Rear(push image for zoom)

Features

-Display valiations as below example

Audio Level

Input video

L/R Audio dB

L/R VU

L/R spectrum

Loudness level

Short term loudness

dB peak

Loudness history

- HD an SD-SDI signal input supported
- External audio input/output: 8 channels each for AES/EBU input and output signals (total of 16 channels),
- 8 channels each for analog balanced input/output signals
- Stereo speakers (for left and right channel signals) provided, model AM-3803 equipped with a woofer as well
- Loudness meter function incorporated
- Loudness meter functions compliant with the ARIB TR-B32 standards (ITU-R BS.1770 standards) featured
- 5.1 multichannel down-mixing function: Computation formulae of ISO/IEC 13818-7:1997(E) standards and
- ARIB STD-B21 standards supported
- Status display, audio level bars, VU meter, spectrum analyzer, Lissajous waveform, audio peak display,
- loudness meter and other display functions
- Audio channel switching function, preset data loading function, alarm output function, external device control
- function and time input connector
- 1U rack-mounting size; both AC and DC 12V input power sources supported

Specifications

AM-3805

Input

HD-SDI (SMPTE292M), SD-SDI (SMPTE259M-C)

Output

Embedded audio (SMPTE299, SMPTE272)

AES3id (Sampling rate 48KHz) impedance 75Ω

Rated Voltage

DC12V (10-18V supported), AC100-240V 50/60Hz

Power Consumption

max. 38W

Operating Circumstance

0-40℃, 30-80%RH (no condensation)

Dimensions and Weight

430(W)×44(H)×205(D)mm, Approx. 2.7kg

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