Unlock instant, AI-driven research and patent intelligence for your innovation.

Method and apparatus for detecting Co-channel interfering NTSC signal accompaning with digital TV signal

A technology of digital TV signal and TV signal, which is applied in the parts of color TV, parts of TV system, amplitude demodulation of homodyne/synchronous circuit, etc., which can solve the problem of insensitivity of pseudo-genetic phenomenon

Inactive Publication Date: 2003-06-04
SAMSUNG ELECTRONICS CO LTD
View PDF9 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

By arranging the inverse Hilbert transform quadrature phase synchronous video detection response to sufficiently small frequencies below 750 kHz, such auxiliary receivers become substantially insensitive to artifacts of the co-channel DTV signal

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method and apparatus for detecting Co-channel interfering NTSC signal accompaning with digital TV signal
  • Method and apparatus for detecting Co-channel interfering NTSC signal accompaning with digital TV signal
  • Method and apparatus for detecting Co-channel interfering NTSC signal accompaning with digital TV signal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0011] Figure 1 shows the parts of a television receiver capable of receiving NTSC analog television signals as well as DTV signals. An over-the-air television broadcast signal received by an antenna 1 is amplified by a tunable radio frequency (RF) amplifier 2 and supplied to a first detector 3 . The radio frequency amplifier 2 and the first detector 3 have variable tuning and integral function as a tuner to select a digital television signal from one of the channels at different positions in the frequency band. The first detector 3 includes: a first local oscillator, which provides a first local oscillation, which can be tuned in the ultra high frequency (UHF) television broadcast band; and a first mixer, which is used to combine the first The local oscillator is mixed with a television signal selected by a tunable radio frequency amplifier 2 to upconvert the selected television signal to produce a 6MHz wide UHF intermediate frequency band above the frequency of the allocated...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The video portion of any co-channel interfering NTSC signal is synchrodyned to baseband, for generating an in-phase demodulation result including 1st artifacts of the digital television signal, and for generating a quadrature-phase demodulation result including 2nd one of the digital television signal. The quadrature-phase demodulation results are phase shifted by 90 deg. at frequencies in a prescribed frequency range before being linearly combined with the in-phase quadrature-phase demodulation results, to generate a linear combining result substantially free of 1 st and 2nd in the prescribed frequency range. an indication that the digital television signal is accompanied by co-channel interfering NTSC signal of substantial amplitude is generated by detecting whenever the amplitude of the linear combining result exceeds a prescribed value.

Description

technical field [0001] The present invention relates to digital television transmitted by radio waves within the broadcast television frequency band, and more particularly to the detection of digital television signals in digital television receivers when accompanied by relatively large co-channel interference NTSC (N system) signals method. Background technique [0002] The Digital Television Standard published by the Advanced Television Subcommittee (ATSC) on September 16, 1995, describes the properties of the Vestigial Sideband (VSB) signal used to transmit a Digital Television (DTV) signal in a 6 MHz bandwidth television channel. Channels are, for example, those of the National Television Subcommittee (NTSC) analog television signal currently used for over-the-air broadcasts in the United States. As long as the NTSC analog television signal continues to broadcast, it will be necessary in the receiver of the DTV signal to be able to determine when the NTSC analog televis...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): H03D1/22H04N21/41
Inventor 艾伦·L·林伯格
Owner SAMSUNG ELECTRONICS CO LTD