KR960006393A - Video-on-demand (VOD) system with radio transceiver - Google Patents

Abstract

The wireless on-demand video system for arbitrarily changing and selecting the transmitting side A / V and data in response to the receiver's request converts the system control data input signal into an RF signal for wireless transmission and transmits the wirelessly received RF A / V and data signal. A receiver provided with a wireless transmission / reception circuit for IF conversion and demodulation output, wirelessly receiving system control RF data from the receiver, performing IF conversion and demodulation, and selecting a plurality of A / V and data information sources according to the system control data And a transmitter provided with a wireless transmission / reception circuit for converting and outputting corresponding information into an RF signal.

Description

Video-on-demand (VOD) system with radio transceiver

As this is a public information case, the full text was not included.

2 is a schematic block diagram of a VOD system provided with a wireless transmission / reception unit of the present invention.

3 is a detailed circuit diagram of a wireless transceiver according to the present invention.

4 is a detailed circuit diagram of a wireless receiver according to the present invention.

5 is a frequency spectrum diagram applied to video transmission of the present invention.

6 is an example of application to an RF remote controller having a VOD function as a first embodiment of the present invention.

Claims (3)

A receiver is provided with a wireless transmission / reception circuit for converting a system control data input signal into an RF signal for wireless transmission, IF conversion and demodulation output of the radio received RF A / V and data signal, and a system control RF data from the receiver side. An on-demand transmission / reception unit including a transmitter having a radio transmission / reception circuit for receiving, performing IF conversion and demodulation, and selecting a plurality of A / V and data information sources according to system control data and converting the information into an RF signal. Video system. The wireless transmit / receive circuit of the receiver includes: a third mixer 263 for converting control data modulated by the modulator 265 into an RF signal as an oscillation signal of the first OSC 260 controlled by the PLL 259; The first OSC 260 receives the PAM 262 which amplifies the RF control data of the third mixer 263 and transmits the RF control data to the antenna, and receives the A / V and data RF signals that are received at the antenna by the LNA 252. The first mixer 253 for mixing A / V and data primary IF by mixing with the oscillation signal of the first wave, and the primary IF of the first mixer 253 with the oscillation signal of the secondary OSC 261. And a second mixer 256 for generating a second IF, and first and second demodulators 258 and 268 for demodulating and outputting A / V and data included in the second IF signal, respectively. Having an on-demand video system. The RF transmitter / receiver circuit of claim 1, wherein the radio transceiver circuit of the transmitter mixes the A / V input and the system control data with the oscillation signal of the first OSC 160 controlled by the PLL by the first and second modulators 165 and 175. A third mixer 163 for converting, a PAM 162 for amplifying RF A / V and data output signals of the third mixer 163 and transmitting them wirelessly through an antenna, and an LNA 152 that is received at the antenna. The first mixer 153 for generating the first IF by mixing the low noise amplified RF control data with the bilge signal of the first OSC 160 and the first IF signal with the oscillation signal of the second OSC 161. A secondary mixer 156 for generating a secondary IF signal, and a demodulator 158 for demodulating the secondary IF signal and outputting control data for an information source. system. ※ Note: The disclosure is based on the initial application.