Analog channel audio broadcasting monitoring performs by measuring demodulated sound
signal with an analog-to-digital converter
1
.
The Analyzer is continuously measuring the channel parameters in the selected channel plan
and according to the selected channel template. The results of digital DVB-C/ DVB-T channel
measurement are values of actual channel power level, MER, BER before and after the Reed-
Solomon/Viterbi decoder. And the results of analog channel measurement are the values of signal
level, video to audio ratio and video carrier to noise ratio within the video channel bandwidth. The
MPEG transport stream is checked for compliance with ETSI TR101290 standard requirements
(priority 1 and 2).
The measured parameters are stored in the non-volatile memory of the Analyzer together with
the time and date of measurement for each channel. The CIU-003 Analyzer can store up to 80
measurement cycles (one cycle includes measurement of all channels in the channel plan). After
the saved measurement results are transferred to a remote PC with installed
ViewRSA
software,
the corresponding memory cells become available for saving the next measurement results. Thus
all the measurement results can be stored in the
ViewRSA
database for any period of time.
1.7.2. Block Diagram
The block diagram of CIU-003 is shown in Figure 1.3.
Low-Pass Filter
(LPF)
Attenuator
0/20/40dB
(A)
Tuner
(T)
Bandpass Filter
IF2 39.000 MHz
(BPF1)
Mixer
(M)
Bandpass Filter
IF3 10.7 MHz
(BPF3)
Logarithmic Gain
Amplifier Limiter
(LGAL)
Local Oscillator
28.3 MHz
(LO)
Bandpass Filter
IF2 36.125 MHz
(BPF2)
DVB-C/T
demodulator
(DD)
Mains Adapter
(MA)
Control Interfaces
(CI)
Nonvolatile
memory
(NVRAM)
Analog-to-Digital
Converter
(ADC)
Peak Detector
(PD)
Control Unit
(CU)
Wide-Band
Amplifier 0/11dB
(WBA)
Frequency
Detector & ADC
(FD)
Figure 1.3
After passing the Low-Pass Filter (LPF), the input signal, if necessary, is strengthened by the
Wide-Band Amplifier (WBA) or reduced by the Attenuator (A). Then it is transformed by the double-
conversion TV Tuner (T) into the second 39 MHz IF signal in the level measurement mode or into
the second 36.125 MHz IF signal in the DBV-C/DVB-T signal demodulation mode.
9
1
For hardware modification 2.14.2 or higher
