Communication system, frequency control method, remote terminal and non-transitory computer-readable recording medium having stored therein program

Patent metadata

Field	Value
Publication number	US-9705543-B2
Application number	US-201615251039-A
Country	US
Kind code	B2
Filing date	Aug 30, 2016
Priority date	Aug 31, 2015
Publication date	Jul 11, 2017
Grant date	Jul 11, 2017

Abstract

A wireless-device-end communicator transmits, to a remote-end communicator, an IF signal and a wireless-device-end AF signal, the wireless-device-end AF signal being generated by demodulating the IF signal on a basis of a wireless-device-end local frequency. A remote-end controller starts a tuning mode when an instruction obtainer obtains the start instruction for the tuning mode, and adjusts a remote-end local frequency in accordance with the obtained adjustment instruction. A remote end demodulator demodulates the received IF signal on a basis of the remote-end local frequency, and outputs a remote-end AF signal. An outputter outputs the remote-end AF signal in the tuning mode, and outputs the wireless-device-end AF signal in a normal mode. At an end of the tuning mode, the wireless-device-end local frequency is adjusted in such a way that the reception frequency of a wireless device becomes consistent with the reception frequency indicated by the last adjustment instruction.

First claim

What is claimed is:

1. A communication system comprising a wireless device and a remote terminal connected to the wireless device via a communication network, and including a tuning mode for a tuning operation, wherein:
the wireless device comprises:
a frequency converter to perform, on a basis of a wireless-device-end local frequency, a frequency conversion on a reception signal on a basis of a radio wave captured by an antenna, and output an intermediate frequency (IF) signal;
a wireless-device-end demodulator to demodulate the IF signal, and output a wireless-device-end audio frequency (wireless-device-end AF) signal that is the demodulated signal;
a wireless-device-end communicator to transmit the IF signal and the wireless-device-end AF signal to the remote terminal, and exchange a control signal with the remote terminal; and
a wireless-device-end controller to adjust the wireless-device-end local frequency,
the remote terminal comprises:
an instruction obtainer to obtain an adjustment instruction of a reception frequency;
a remote-end communicator to receive the IF signal and the wireless-device-end AF signal from the wireless device, and exchange a control signal with the wireless device;
a remote-end demodulator to demodulate the received IF signal on a basis of a remote-end local frequency, and output a remote-end audio frequency (remote-end AF) signal that is the demodulated signal;
a remote-end controller to adjust the remote-end local frequency in accordance with the adjustment instruction obtained by the instruction obtainer in the tuning mode; and
an outputter to output the remote-end AF signal output by the remote-end demodulator in the tuning mode, and output the wireless-device-end AF signal received by the remote-end communicator in a mode other than the tuning mode,
wherein:
the remote-end communicator is to transmit the control signal representing the last adjustment instruction at an end of the tuning mode, and
when the wireless-device-end communicator receives the control signal representing the last adjustment instruction, the wireless-device-end controller is to adjust the wireless-device-end local frequency in accordance with the last adjustment instruction.

2. The communication system according to claim 1 , wherein:
when the reception frequency indicated by the adjustment instruction in the tuning mode exceeds a defined band, the remote-end communicator is to transmit the control signal representing the adjustment instruction, and
when the wireless-device-end communicator receives the control signal representing the adjustment instruction, the wireless-device-end controller is to adjust the wireless-device-end local frequency in accordance with the adjustment instruction.

3. The communication system according to claim 2 , wherein:
the remote-end communicator is to transmit the control signal for a notification of a start of the tuning mode at the start of the tuning mode, and is to transmit the control signal for a notification of an end of the tuning mode at the end of the tuning mode,
the wireless-device-end communicator is to receive the control signal for the notification of the start of the tuning mode and the end of the tuning mode, transmit the IF signal in the tuning mode and transmit the wireless-device-end AF signal in the mode other than the tuning mode in accordance with the control signal, and
the remote-end communicator is to receive the IF signal in the tuning mode, and receive the wireless-device-end AF signal in the mode other than the tuning mode.

4. The communication system according to claim 2 , wherein in both the tuning mode and the mode other than the tuning mode, the wireless-device-end communicator is to transmit both the IF signal and the wireless-device-end AF signal, and the remote-end communicator is to receive both the IF signal and the wireless-device-end AF signal.

5. The communication system according to claim 1 , wherein:
the remote-end communicator is to transmit the control signal for a notification of a start of the tuning mode at the start of the tuning mode, and is to transmit the control signal for a notification of an end of the tuning mode at the end of the tuning mode,
the wireless-device-end communicator is to receive the control signal for the notification of the start of the tuning mode and the end of the tuning mode, transmit the IF signal in the tuning mode and transmit the wireless-device-end AF signal in the mode other than the tuning mode in accordance with the control signal, and
the remote-end communicator is to receive the IF signal in the tuning mode, and receive the wireless-device-end AF signal in the mode other than the tuning mode.

6. The communication system according to claim 1 , wherein in both the tuning mode and the mode other than the tuning mode, the wireless-device-end communicator is to transmit both the IF signal and the wireless-device-end AF signal, and the remote-end communicator is to receive both the IF signal and the wireless-device-end AF signal.

7. A frequency control method executed by a communication system comprising a wireless device and a remote terminal connected to the wireless device via a communication network, and including a tuning mode for a tuning operation, the method comprising:
performing, on a basis of a wireless-device-end local frequency, a frequency conversion on a reception signal on a basis of a radio wave captured by an antenna of the wireless device to generate an intermediate frequency (IF) signal;
generating, at the wireless device, a wireless-device-end audio frequency (wireless-device end AF) signal that is the demodulated IF signal;
generating, at the remote terminal, a remote-end audio frequency (remote-end AF) signal that is the demodulated IF signal on a basis of a remote-end local frequency;
obtaining an adjustment instruction of a reception frequency;
adjusting, in the tuning mode, the remote-end local frequency in accordance with the obtained adjustment instruction, and adjusting the wireless-device-end local frequency in accordance with the last adjustment instruction at an end of the tuning mode; and
outputting the remote-end AF signal from the remote terminal in the tuning mode, and outputting the wireless-device-end AF signal from the remote terminal in a mode other than the tuning mode.

8. The frequency control method according to claim 7 , further comprising adjusting, when the reception frequency indicated by the adjustment instruction in the tuning mode exceeds a defined band, the wireless-device-end local frequency in accordance with the adjustment instruction.

9. A remote terminal including a tuning mode for a tuning operation, the remote terminal comprising:
an instruction obtainer to obtain an adjustment instruction of a reception frequency for a wireless device connected via a communication network;
a remote-end communicator to receive, from the wireless device, an intermediate frequency (IF) signal generated by performing, on a basis of a wireless-device-end local frequency, a frequency conversion on a reception signal on a basis of a radio wave captured by an antenna of the wireless device, and a wireless-device-end audio frequency (wireless-device-end AF) signal that is a signal generated by demodulating the IF signal, and exchange a control signal with the wireless device;
a remote-end demodulator to demodulate the received IF signal on a basis of a remote-end local frequency, and output a remote-end audio frequency (remote-end AF) signal that is the demodulated signal;
a remote-end controller to adjust the remote-end local frequency in accordance with the adjustment instruction obtained by the instruction obtainer in the tuning mode; and
an outputter

Assignees

• Icom Inc

Inventors

• Nishihata Masaaki

Classifications

• H04B1/40

  Circuits · CPC title

• H04B1/1027 Primary

  assessing signal quality or detecting noise/interference for the received signal · CPC title

• H04B2001/1072

  by tuning the receiver frequency · CPC title

• H04B1/26

  for superheterodyne receivers (multiple frequency-changing H03D7/16) · CPC title