|
The A / D converter, inside the MKQE-310 digital microwave equipment, is part of the optional TI's
dedicated video decoder chip. Analog video signal A / D converter after a 10 bit parallel digital video
signals into the audio / video compression chip, the video compression encoders compressed into a
basic video stream flow ES, Es stream after package with a Encapsulation of the PES flow into the
program multiplexer. Audio Signal 1, 2 respectively, the audio signal A / D transform a 24 bit serial
digital audio signals into the audio coding, the audio compression encoder compressed into a streaming audio ES, ES flows through the pack after the formation of the band Wrapper PES audio streaming into
the program multiplexer. At the same time data signals after the formation of the packaged data PES.
Video PES, audio PES, the data were sent to PES program multiplexer, the program multiplexer after the formation of a fixed structure of the TS-frame, frame structure for its length of 188 bytes. TS flow of the
ASI output for the serial interface.
Through the equipment attached to two external data lines, encoded circuit ASI data output and QPSK modulation circuit of the ASI data input connected.
QPSK modulation for digital television in the handling of data flow on the energy use of the proliferation
of random treatment, RS coding, convolution intertwined, and contract convolutional code, modulation
before forming the base-band processing to ensure that the data transmission performance.
QPSK modulation circuit output signal through a different outdoor-power microwave amplifiers for enlarge
the band, with different antennas, transmission distance is 10-50 km.
Performance indexes
Video input interface
2. composite video NTSC：1Vp-p，75Ω，BNC
Audio input interface
1. Balanced interface: impedance is 600Ω，input level is 0dB—16dB.
Video encoding
1. Video encoding standard：MPEG-2 MP/ML，international standard ISO/IEC 13818.
2. Distinguish rate：720×480×30 or 720×576×25.
3. Distinguish rate：720×480×30 or 720×576×25.
4. Frame structure：Variable.
Audio encoding
1. Audio encoding standard：MPEG-2 2/0 Stereo.
2. Audio compression rate：32K、64K、96K、128K、160K、192K、224 K、256 K、320 K、384K.
3. Audio sampling frequency：32KHZ、48KHZ.
★ Roll-off factor： 0.35
★ Convolutional code：1/2
★ Transmission rate： 3M ~ 12M (Continuous adjustable)
★ IF output frequency range：950MHz ~ 1550MHz. | 
