# US 2006/0222060 A1 · Transmission/reception signal conversion circuit and transmission/reception signal conversion method > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2006/0222060 A1 - Document ID: US20060222060A1 - Status: Published application - Kind: A1 - Application number: 11/390,302 - Filed: 2006-03-28 - Published: 2006-10-05 - Earliest claimed: 2005-03-31 - Assignees: NEC Corporation - Inventors: Tsukasa Ueno - Web page: https://patentgrep.com/patent/US20060222060A1 ## CPC - H04B 17/318: Received signal strength - H04W 24/00: Supervisory, monitoring or testing arrangements - H04B: TRANSMISSION - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract A transmission/reception signal conversion circuit, which can readily convert a signal level or a carrier frequency of a communication device without changing or adding an internal circuit of the communication device, is provided. The transmission/reception signal conversion circuit is connected between two communication devices, each of which communicates with each other, and the transmission/reception signal conversion circuit performs at least one of conversions of a signal level of a transmission signal, a signal level of a reception signal, a frequency of a transmission carrier signal, and a frequency of a reception carrier signal. ## Claims ### Claim 1 A transmission/reception signal conversion circuit, which is connected between a first communication device and a second communication device, comprising: a transmission circuit, which inputs a transmission signal transmitted from the first communication device, converts a signal level of the transmission signal to a first predetermined level required for communicating with the second communication device, and outputs the converted transmission signal to the second communication device; a reception circuit, which receives a reception signal received from the second communication device; and a transmission signal detection circuit, which measures a signal level of the transmission signal, and provides a mode change signal when the signal level of the transmission signal is higher than a second predetermined level, wherein, the transmission circuit is enabled when the mode change signal is provided and the reception circuit is enabled when the mode change signal is not provided. ### Claim 2 A transmission/reception signal conversion circuit, which is connected between a first communication device and a second communication device, comprising: a transmission circuit, which inputs a transmission signal transmitted from the first communication device; a reception circuit, which receives a reception signal transmitted from the second communication device, converts a signal level of the reception signal to a third predetermined level required for communicating with the first communication device, and outputs the converted reception signal to the first communication device; and a transmission signal detection circuit, which measures a signal level of the transmission signal, and provides a mode change signal when the signal level of the transmission signal is higher than a second predetermined level, wherein, the transmission circuit is enabled when the mode change signal is provided and the reception circuit is enabled when the mode change signal is not provided. ### Claim 3 (depends on 1) The transmission/reception signal conversion circuit according to claim 1, further comprising: a switch circuit, which is connected to the transmission signal detection circuit, and enables one of the transmission circuit and the reception circuit depending on receiving state of the mode change signal. ### Claim 4 (depends on 2) The transmission/reception signal conversion circuit according to claim 2, further comprising: a switch circuit, which is connected to the transmission signal detection circuit, and enables one of the transmission circuit and the reception circuit depending on receiving state of the mode change signal. ### Claim 5 A transmission/reception signal conversion circuit, which is connected between a first communication device and a second communication device, comprising: a transmission circuit, which inputs a transmission carrier signal transmitted from the first communication device, converts a frequency of the transmission carrier signal to a first predetermined frequency required for communicating with the second communication device, and outputs the converted transmission carrier signal to the second communication device; a reception circuit, which receives a reception signal transmitted from the second communication device; and a transmission signal detection circuit, which measures a signal level of a transmission signal inputted from the first communication device, and provides a mode change signal when the signal level of the transmission signal is higher than a first predetermined level, wherein, the transmission circuit is enabled when the mode change signal is provided and the reception circuit is enabled when the mode change signal is not provided. ### Claim 6 A transmission/reception signal conversion circuit, which is connected between a first communication device and a second communication device, comprising: a transmission circuit, which inputs a transmission signal transmitted from the first communication device; a reception circuit, which receives a reception carrier signal received from the second communication device, converts a frequency of the reception carrier signal to a second predetermined frequency required for communicating with the first communication device, and outputs the converted reception carrier signal to the first communication device; and a transmission signal detection circuit, which measures a signal level of the transmission signal, and provides a mode change signal when the signal level of the transmission signal is higher than a first predetermined level, wherein, the transmission circuit is enabled when the mode change signal is provided and the reception circuit is enabled when the mode change signal is not provided. ### Claim 7 (depends on 5) The transmission/reception signal conversion circuit according to claim 5, further comprising: a switch circuit, which is connected to the transmission signal detection circuit, and enables one of the transmission circuit and the reception circuit depending on receiving state of the mode change signal. ### Claim 8 (depends on 6) The transmission/reception signal conversion circuit according to claim 6, further comprising: a switch circuit, which is connected to the transmission signal detection circuit, and enables one of the transmission circuit and the reception circuit depending on receiving state of the mode change signal. ### Claim 9 (depends on 7) The transmission/reception signal conversion circuit according to claim 7, wherein both of the first and second communication devices are wireless communication devices with respective antennas for signal transmission and reception, and an input path of the transmission signal from the first communication device and an output path of the reception signal to the first communication device are connected in common with the antenna of the first communication device. ### Claim 10 (depends on 8) The transmission/reception signal conversion circuit according to claim 8, wherein both of the first and second communication devices are wireless communication devices with respective antennas for signal transmission and reception, and an input path of the transmission signal from the first communication device and an output path of the reception signal to the first communication device are connected in common with the antenna of the first communication device. ### Claim 11 A transmission/reception signal conversion method of converting transmission/reception signals exchanged between a first communication device and a second communication device, comprising: measuring a signal level of a transmission signal inputted from the first communication device at a transmission signal detection circuit; and enabling one of a transmission circuit and a reception circuit depending on the signal level of the transmission signal having been measured; wherein, when the transmission circuit is enabled, the transmission circuit converts a signal level of the transmission signal to a first predetermined level required for communicating with the second communication device and outputting the converted transmission signal to the second communication device. ### Claim 12 A transmission/reception signal conversion method of converting transmission/reception signals exchanged between a first communication device and a second communication device, comprising: measuring a signal level of a transmission signal inputted from the first communication device at a transmission signal detection circuit; and enabling one of a transmission circuit and a reception circuit depending on the signal level of the transmission signal having been measured; wherein, when the reception circuit is enabled, the reception circuit converts a signal level of the reception signal transmitted from the second communication device to a second predetermined level required for communicating with the first communication device and outputting the converted reception signal to the first communication device. ### Claim 13 (depends on 11) The transmission/reception signal conversion method according to claim 11, further comprising: providing a mode change signal, at the transmission signal detection circuit, for enabling the transmission circuit when the measured signal level of the transmission signal is higher than a third predetermined level, and enabling the reception circuit when the mode change signal is not provided. ### Claim 14 (depends on 12) The transmission/reception signal conversion method according to claim 12, further comprising: providing a mode change signal, at the transmission signal detection circuit, for enabling the transmission circuit when the measured signal level of the transmission signal is higher than a third predetermined level, and enabling the reception circuit when the mode change signal is not provided. ### Claim 15 A transmission/reception signal conversion method of converting transmission/reception signals exchanged between a first communication device and a second communication device, comprising: measuring a signal level of a transmission signal inputted from the first communication device at a transmission signal detection circuit, and enabling one of a transmission circuit and a reception circuit depending on the signal level of the transmission signal having been measured; and converting a frequency of a transmission carrier signal transmitted from the first communication device, at the transmission circuit, to a first predetermined frequency required for communicating with the second communication device and outputting the converted transmission carrier signal to the second communication device when the transmission circuit is enabled. ### Claim 16 A transmission/reception signal conversion method of converting transmission/reception signals exchanged between a first communication device and a second communication device, comprising: measuring a signal level of a transmission signal inputted from the first communication device at a transmission signal detection circuit, and enabling one of a transmission circuit and a reception circuit depending on the signal level of the transmission signal having been measured; and converting a frequency of a reception carrier signal received from the second communication device, at the reception circuit, to a second predetermined frequency required for communicating with the first communication device and outputting the converted reception carrier signal to the first communication device when the reception circuit is enabled. ### Claim 17 (depends on 15) The transmission/reception signal conversion method according to claim 15 further comprising: providing a mode change signal, at the transmission signal detection circuit, for enabling the transmission circuit when the measured signal level of the transmission signal is higher than a third predetermined level, and enabling the reception circuit when the mode change signal is not provided. ### Claim 18 (depends on 16) The transmission/reception signal conversion method according to claim 16 further comprising: providing a mode change signal, at the transmission signal detection circuit, for enabling the transmission circuit when the measured signal level of the transmission signal is higher than a third predetermined level, and enabling the reception circuit when the mode change signal is not provided.