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  • Imagine Communications CMN-LA

Imagine Communications CMN-LA

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Digital Audio Input
Audio Formats AES/EBU (optional), embedded audio
AES Input Connector Type 8 BNC female
AES Input Impedance 75 ohms nominal
AES Input Return Loss ?25 dB, 0.1 to 6 MHz (unbalanced)
AES Input Level 0.2 to 2 V
AES Input Sample Rate 32 kHz, 44.1 kHz, 48 kHz, 88.2 kHz, 96 kHz
(audio inputs are sample rate converted to 48 kHz)
Meter accuracy over frequency ±0.1 dB from 20 Hz to 19 kHz with 0 to -40 dBFS sine wave input, except for within 7 Hz of some submultiples of the 240 kHz oversampling frequency
Digital Audio Output
AES Outputs (optional) AES outputs are derived from embedded, AES, or Dolby® audio inputs
AES Output Connector Type 4 BNC female
AES Output Impedance 75 ohms nominal
AES Output Return Loss ?25 dB, 0.1 to 6 MHz (unbalanced)
Analog Audio
Analog Output Frequency Response with Digital Inputs ±0.1 dB
Analog Output SNR with Digital Inputs ?100 dB
Analog Output THD and Noise With Digital Inputs .02%
Crosstalk ?-80 dB
3G-SDI Input
Input Type 2 active looping inputs
Input Connector Type BNC female
Input Impedance 75 ohms nominal
Signal Source Amplitude 800 mV nominal
Signal Source DC Offset ±0.5 V
Input Return Loss ?-10 dB, 1.485 to 2.97 GHz
Cable EQ ?80 m, Belden 1694A
HD-SDI Input
Input Type 2 active looping inputs
Input Connector Type BNC female
Input Impedance 75 ohms nominal
Signal Source Amplitude 800 mV nominal
Signal Source DC Offset ±0.5 V
Input Return Loss ?-15 dB, 270 MHz to 1.485 GHz
Cable EQ ?100 m, Belden 8281
SD-SDI Input
Input Type 2 active looping inputs
Input Connector Type BNC female
Input Impedance 75 ohms nominal
Signal Source Amplitude 800 mV nominal
Signal Source DC Offset ±0.5 V
Input Return Loss ?-25 dB, 5 to 270 MHz
Cable EQ ?300 m, Belden 8281
3G/HD/SD-SDI Output
Output Impedance 75 ohms
Output Return Loss ?-15 dB, 5 MHz to 1.485 GHz
Output Return Loss ?-10 dB, 1.485 to 3 GHz
Output Signal Level 800 mV ±10%
Output DC Offset 0 V ±0.5 V
DVI Output
Output Connector DVI-I connector supporting DVI-D
Output Resolution 1024×768 (XGA)
Digital Levels Per DDWG DVI rev 1
Pixel Rate 65 Mp/s
Analog Monitoring Output (Headphone)
Number/Connector 1 stereo output, 1x 1/8 in. (3.5 mm)headphone jack
Load Impedance 16 ohms nominal
Maximum Output Level 44 mW RMS
Total Harmonic Distortion + Noise (THD+N) ?–65 dB
Control (Optional)
GPI 4 total with 2 input and 2 preset recall selections or individually user configured as alarm input
GPO 1 alarm, user configured
Connector 15-pin HD (high-density) D-sub, female
Input Impedance 10 k ohms returned to +3.3 VDC
Alarm Output Relay closure
Maximum Relay Current 100 mA @ 50 VDC
Peripheral Interface USB 2.0 supporting storage devices
Connector USB 2.0, Type A, female
Input (Optional) LTC via back-panel connector
Ancillary timecode (HD only)
DVITC extracted from SD inputs
Communication Interfaces
Ethernet 1 Ethernet port, RJ45 connector, 10/100Base-T
USB 1 USB 2.0 host port
LTC/GPIO 1 LTC/GPIO connector 15-pin female D-sub (optional)
Standard 10/100Base-T conforms to IEEE802.3
Connector RJ45
Performance Metric Transfer a captured frame to a PC in 30 sec, dedicated LAN
Power Requirements
Power Connector 15 VDC nominal
11 VDC minimum, 17 VDC maximum
Power Consumption 25 W nominal
Over-Voltage Protection ±50 VDC nominal
Dimensions (H x W x D) 5.22 x 8.46 x 5.8 in. (13.26 x 21.49 x 14.73 cm)
Weight 5 lbs (2.27 kg)
Operating Temperature 32° to 122° F (0° to 50° C)
Storage Temperature -22° to 149° F (-30° to 65° C)
Humidity (non-condensing) Operating: 20% to 80%
Non-operating: 5% to 90%
Transportation 24 in. (9.5 cm) impact-drop survivable in original factory packaging
Altitude 6562 ft (2000 m)
Pollution Degree 2
Standard Accessories Installation and operation handbook on CD
Breakout connector for LTC/GPI
1 power cord
1 power supply assembly


Loudness Analyzer


Videotek® CMN-LA loudness analyzer is a comprehensive audio monitoring tool that makes it easy to confirm compliance with the latest loudness requirements. Loudness and true peak measurements are made to the ITU-R BS.1770-3 standard with five times oversampling. Built-in modes offer quick setup to ARIB TR-B32, ATSC A/85 or EBU R 128 recommendations. Up to five days of loudness data are stored internally and easily retrieved through the USB port or internal web server. Metering of up to 16 channels simultaneously makes for rapid alignment checks.

Integated into the CMN-LA is the TC Electronic® loudness radar meter, which shows loudness on short-terms meters, graphs covering periods from one minute to 24 hours, and numeric display of the long-term center of gravity (average loudness) and consistency (loudness range). The flexible display of the CMN-LA presents data in a format most useful for the job at hand. Use the integrated TC Electronic® loudness radar meter during production, the audio status display during program ingest, and the combination of loudness and true peak meters, numeric display and trend chart for master control monitoring. The chart data can be exported for compliance reporting. Adjustable audio output delay compensates for video monitor processing in critical evaluation suites.

Short mounting depth makes the CMN-LA loudness analyzer ideal in a QC monitoring rack or on the meter bridge of an audio console.

• Loudness measurement to ITU-R BS.1770-3
• True peak measurement to ITU-R BS.1770-3 with five times oversampling
• Integrated TC Electronic® loudness radar display
• Trend chart of levels (15 seconds to 24 hours)
• Export values to a PC
• Audio status display of clips, mutes, average, high and low levels
• Meter up to 16 channels
• Alarms for levels, status and Dolby® metadata
• Two triple rate SDI inputs
• Optional eight AES inputs
• Optional Four AES and eight analog outputs
• Adjustable output delay
• Optional Dolby® AC3 and E decoding (requires AES I/O option)

The basic CMN-LA unit operates with 3G/HD/SD-SDI embedded audio sources, with a hardware option for eight AES inputs, four AES outputs and eight analog outputs. The analog outputs are meant to drive high impedance loads.

Dolby® decoding is a hardware option available at the time of order, or for field installation. The Dolby® decoder requires the AES I/O option. The AES option also includes an LTC input for time stamping of log entries.

The CMN-LA also includes internal speakers and a front-panel headphone jack for source confirmation. A mixdown mode can be applied to the headphone output when using discreet sources. The mixdown parameters are taken from VANC medatada if present, otherwise internal menu settings are used.


AES I/O option for the CMN-LA; adds 8 AES inputs and 4 AES/8 analog outputs along with LTC input and GPIO to the CMN-LA, field install

Dolby® decode option for the CMN-LA; adds decoding and metadata readout of Dolby® Digital (AC3) and Dolby® E streams; requires CMN-LA-OPT-AES option, field install

Portable case with handle and tilt bail

Dual rackmount adapter; mount 1 or 2 CMN-LA or CMN-91 in a 19 in. (48.2 cm) equipment rack. 3RU high

Blank panel for unused side of a DRC-3