The document describes a voltage controlled mixer (VCM-28) with the following key specifications: 1. It is a 15-channel mixer with balanced inputs tuned for Shure SM48/SM58 microphones. 2. Each channel provides noise-free signal pickup and switching is done digitally without noise. 3. The mixer can be cascaded with another using a mixer bus and has LED indicators for channel status.

1. VOLTAGE CONTROLLED MIXER – VCM-28
DESCRIPTION: TECHNICAL SPECIFICATIONS:
It is a voltage controlled mixer with remote T.E.I.N. (DIN Audio)
operation. It is having 15 identical channels and
the channels are tuned for the Shure mic MIC lnput, 150 Ohms source: -128.5dB
SM48/SM58. Each channel is balanced in nature LINE lnput, 10 Ohms source: -98.5dBm
for noise free pickup. The special circuit with T.H.D and NOISE: <0.08%
digital technology makes the switching without FREQUENCY RESPONSE +0-1dB
any noise. The channel level can be adjusted
from the front for mic or line input without
0dBm, 600 Ohms MIC input to L/R output:
changing the input jacks. The output is available
in two levels. The mixer can be cascaded with 25 Hz to 19 KHz
another mixer using the mixer bus, which is IMPEDENCE
provided at the rear of the equipment. The MIC input : Typically 2K Ohms
output level is indicated by a 5 LED array as LINE input : 20K Ohms (balanced)
well as can be monitored by a headphone an 10K Ohms (balanced
LED indication is provided at the front to show
the status of the mic whether the microphone is L/R output : <50 Ohms
ON or OFF. The switing logic is taken out MAXOMUM GAIN
through 36 pin ceotronics connector which is MIC input to L/R output: 76dB
suitable for Sonic GMFB-100. The equipment is LINE input to L/R output: 55dB
made out of Aluminums channel chassis for less NOMINAL OUTPUT LEVEL: 0dBm
RF interference. The equipment occupies 1 U
size in 19 inch rack. It also uses the toroidal MAXIMUM OUTPUT : +17dBm (5.5V RMS)
transformer for improved S/N ratio.

2. VOLTAGE VONTROLLED MIXER – (VCM-28)
FEATURES: SPECIFICATIONS:
 VCM-28 is one among the special featured  Line input Imp : 10 Kohm
analog audio processor for distributing the
audio signals for long distances without
introducing electromechanical noise pickup.  Line gain range : 0 to + 20 db
The frequency response is also maintained as
original.  Freq response : 50Hz to 15KHz
 Special toroidal transformer is used to
improve the signal to ratio noise.  Output Impedance : 200 ohm
 Voltage controlled amplifiers (VCA) are
introduced in the audio chain to increase or  Output Over Drive : 24 dbv
decrease the audio level without introducing
the carbon track noise of rotary control.
 Inputs and outputs through Stereo 1/4 inch  THD + Noise : < 0.02%
phono connectors.
 S/N Ratio : > 85db

3. AUDIO PROCESSOR CHANGOVER VCM - 28C
FEATURES: SPECIFICATIONS:
 Sonic M85 changeover / VCM-28C are one  Line input Imp : 10 Kohm
among the special featured analog audio
processor changeover for distributing the
audio signals for long distances without  Line gain range : 0 to + 20 db
introducing electromechanical noise pickup.
The frequency response is also maintained as  Freq response : 50Hz to 15KHz
original.
 Basically it changes the main and standby  Output Impedance : 200 ohm
audio processor inputs and outputs through
relay.
 Output Over Drive : 24 dbv
 Our Wireless Interface WI - 200 / Audio
Processor Mixer APC - 82 / Voltage
Controller Mixer VCM - 28 can be connected  THD + Noise : < 0.02%
to the mixer changeover for additional
features.  S/N Ratio : > 85db
 9 Pin D Type Connector for remote operation
through CHINTCO.

4. INTERPRETER MONITORING SYSTEM-(IMS – 200)
FEATURES: SPECIFICATIONS:
 Monitoring system of interpretation system  The system elements for the above method are:
The system comprises of two sub-systems 1. Computer for each language - 4 in
• Audio case of Lok Sabha
• Time-log 2. Audio recording software- Digi-pro
 Audio 1.4 - 4 nos.
The audio from the floor and the audio from 3. Delegate units - 6 nos.
the interpreter unit can be recorded in our 4. DPS-200 -1 no.
digital recording system by left and right
channels respectively for every ten minutes 5. System computer -1 no.
with overlap of 2 minutes automatically. 6. A9 Cable -50 meter.
7. Print out software - 1 no.
 Time-log 8. Printer LQ-1050 - 1 no.
There are 3 methods of time loging.