Signal quality monitoring apparatus and method

Patent metadata

Field	Value
Publication number	US-11088789-B2
Application number	US-201916681891-A
Country	US
Kind code	B2
Filing date	Nov 13, 2019
Priority date	Nov 13, 2018
Publication date	Aug 10, 2021
Grant date	Aug 10, 2021

Abstract

According to one embodiment, a signal quality monitoring apparatus includes a signal processor, a comparator and a determiner. The processor obtains output signals from a first transmitter and a second transmitter which are mutually redundant and respectively reproduce digital broadcast signals based on a common origin signal, and generates a first signal based on the output signal from the first transmitter and a second signal based on the output signal from the second transmitter. The comparator compares the first signal and the second signal. The determiner determines a quality of the digital broadcast signal based on a result of the comparison.

First claim

What is claimed is:

1. A signal quality monitoring apparatus comprising:
a signal processor configured to obtain output signals from a first transmitter and a second transmitter which are mutually redundant and respectively reproduce digital broadcast signals based on a common origin signal, and generate a first signal based on the output signal from the first transmitter and a second signal based on the output signal from the second transmitter;
a comparator configured to compare the first signal and the second signal; and
a determiner configured to determine a quality of the digital broadcast signals based on a result of the comparison,
wherein the signal processor comprises:
a first demodulator configured to demodulate the output signal from the first transmitter to generate a first constellation signal; and
a second demodulator configured to demodulate the output signal from the second transmitter to generate a second constellation signal, and

wherein the comparator compares the first constellation signal and the second constellation signal.

2. The signal quality monitoring apparatus according to claim 1 , wherein the output signals from the first transmitter and the second transmitter are pre-transmission output signals before being output to an air region.

3. A signal quality monitoring apparatus comprising:
a signal processor configured to obtain output signals from a first transmitter and a second transmitter which are mutually redundant and respectively reproduce digital broadcast signals based on a common origin signal, and generate a first signal based on the output signal from the first transmitter and a second signal based on the output signal from the second transmitter:
a comparator configured to compare the first signal and the second signal; and
a determiner configured to determine a quality of the digital broadcast signals based on a result of the comparison,
wherein the signal processor comprises:
a demodulator configured to demodulate the output signal from the first transmitter to generate a first constellation signal; and
a modulator configured to modulate a broadcast transport stream signal to generate a transmission constellation signal, and

wherein the comparator compares the first constellation signal and the transmission constellation signal.

4. The signal quality monitoring apparatus according to claim 3 , wherein the signal processor further comprises a delay regulator configured to regulate a delay amount of the first constellation signal and the transmission constellation signal, which are compared by the comparator.

5. A signal quality monitoring apparatus comprising:
a signal processor configured to obtain output signals from a first transmitter and a second transmitter which are mutually redundant and respectively reproduce digital broadcast signals based on a common origin signal, and generate a first signal based on the output signal from the first transmitter and a second signal based on the output signal from the second transmitter:
a comparator configured to compare the first signal and the second signal; and
a determiner configured to determine a quality of the digital broadcast signals based on a result of the comparison,
wherein the signal processor
comprises a demodulator configured to demodulate the output signal from the first transmitter to generate a first constellation signal, and

wherein the comparator compares the first constellation signal and a reception constellation signal of the second transmitter.

6. The signal quality monitoring apparatus according to claim 5 , wherein the signal processor further comprises a delay regulator configured to regulate a delay amount of the first constellation signal and the reception constellation signal, which are compared by the comparator.

7. A signal quality monitoring method applied to a signal quality monitoring apparatus configured to obtain output signals from a first transmitter and a second transmitter, which are mutually redundant and respectively reproduce digital broadcast signals based on a common origin signal, the method comprising:
generating, by the signal quality monitoring apparatus, a first signal based on the output signal from the first transmitter;
generating, by the signal quality monitoring apparatus, a second signal based on the output signal from the second transmitter;
comparing, by the signal quality monitoring apparatus, the first signal and the second signal; and
determining, by the signal quality monitoring apparatus, a quality of the digital broadcast signals based on a result of the comparison,
wherein the generating, by the signal quality monitoring apparatus, the first signal demodulates the output signal from the first transmitter to generate a first constellation signal:
wherein the generating, by the signal quality monitoring apparatus, the second signal demodulates the output signal from the second transmitter to generate a second constellation signal, and
wherein the comparing compares the first constellation signal and the second constellation signal.

Assignees

• Toshiba Kk
• Toshiba Infrastructure Systems & Solutions Corp

Inventors

• Matsushita Kenichi
• Iwaida Mikihiko
• Taga Noboru
• Ono Hideki

Classifications

• H04L1/206 Primary

  for modulated signals · CPC title

• H04B17/336

  Signal-to-interference ratio [SIR] or carrier-to-interference ratio [CIR] · CPC title

• H04L1/242

  by comparing a transmitted test signal with a locally generated replica · CPC title

• H04B17/104

  of other parameters, e.g. DC offset, delay or propagation times · CPC title

• H04L2001/0093

  Point-to-multipoint · CPC title