# US 2014/0193163 A1 · Signal processing device, signal processing method, and communication device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0193163 A1 - Document ID: US20140193163A1 - Status: Published application - Kind: A1 - Application number: 14/046,298 - Filed: 2013-10-04 - Published: 2014-07-10 - Earliest claimed: 2013-01-07 - Assignees: Fujitsu Limited - Applicants: Fujitsu Limited - Inventors: Manabu Yamazaki - Web page: https://patentgrep.com/patent/US20140193163A1 ## CPC - H04B 10/5561: {Digital phase modulation} - H04L 27/2067: {with more than two phase states (H04L27/2064 takes precedence)} - H04B: TRANSMISSION - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) ## Abstract A signal processing device includes: a plurality of multipliers configured to obtain a first multiplication result by multiplying a tap coefficient by 1/√2; a plurality of mappers configured to output a mapping result based on a first mapping coefficient and a digital input signal; and a plurality of first selectors configured to select the first multiplication result based on the mapping result. ## Claims ### Claim 1 A signal processing device comprising: a plurality of multipliers configured to obtain a first multiplication result by multiplying a tap coefficient by 1/√2; a plurality of mappers configured to output a mapping result based on a first mapping coefficient and a digital input signal; and a plurality of first selectors configured to select the first multiplication result based on the mapping result. ### Claim 2 (depends on 1) The signal processing device according to claim 1, wherein each of the plurality of first selectors includes: a converter configured to convert a sign of the first multiplication result and output a converted result as a second multiplication result; and a second selector configured to select one of the first multiplication result and the second multiplication result based on the mapping result. ### Claim 3 (depends on 1) The signal processing device according to claim 1, wherein each of the plurality of mappers selects the first mapping coefficient that is input in plurality based on the input signal and output a selected coefficient as the mapping result. ### Claim 4 (depends on 1) The signal processing device according to claim 1, further comprising: an adder configured to add outputs of the plurality of first selectors. ### Claim 5 (depends on 4) The signal processing device according to claim 4, wherein the adder includes: a first adder configured to add outputs from a first group of the plurality of first selectors and output an addition result as a first addition result; and a second adder configured to add outputs from a second group of the plurality of first selectors and output an addition result as a second addition result. ### Claim 6 (depends on 4) The signal processing device according to claim 4, further comprising: a third selector configured to select one of a second mapping coefficient and the output of the adder based on a bypass signal. ### Claim 7 (depends on 6) The signal processing device according to claim 6, further comprising: a fourth selector configured to select the second mapping coefficient from the second mapping coefficient input in plurality and supply a selected coefficient to the third selector. ### Claim 8 (depends on 7) The signal processing device according to claim 7, wherein the fourth selector selects based on one of the input signal and one mapping result that is output from the plurality of mappers. ### Claim 9 A signal processing method, comprising: outputting a first multiplication result by multiplying a tap coefficient of a plurality of bits by 1/√2; selecting a first mapping coefficient from a plurality of first mapping coefficients based on a digital input signal to output a selected coefficient as a mapping result; and selecting one of the first multiplication result and a second multiplication result that is obtained by converting the first multiplication result based on the mapping result to output a selected result as a selection result. ### Claim 10 (depends on 9) The signal processing method according to claim 9, further comprising: converting a sign of the first multiplication result to output a converted result as a second multiplication result; and selecting one of the first multiplication result and the second multiplication result based on the mapping result. ### Claim 11 (depends on 9) The signal processing method according to claim 9, further comprising: selecting the first mapping coefficient that is input in plurality based on the input signal to output a selected coefficient as the mapping result. ### Claim 12 (depends on 9) The signal processing method according to claim 9, further comprising: adding outputs of the plurality of first selectors. ### Claim 13 A communication device, comprising: a signal processing device configured to process an input signal; a digital/analog converter configured to convert an output of the signal processing device to an analog signal; and a modulator configured to perform modulation on the analog signal, wherein the signal processing device includes: a plurality of multipliers configured to obtain a first multiplication result by multiplying a tap coefficient by 1/√2; a plurality of mappers configured to output a mapping result based on a first mapping coefficient and a digital input signal; and a plurality of first selectors configured to select the first multiplication result based on the mapping result. ### Claim 14 (depends on 13) The communication device according to claim 13, wherein each of the plurality of first selectors includes: a converter configured to convert a sign of the first multiplication result and output a converted result as a second multiplication result; and a second selector configured to select one of the first multiplication result and the second multiplication result based on the mapping result. ### Claim 15 (depends on 13) The communication device according to claim 13, wherein each of the plurality of mappers selects the first mapping coefficient that is input in plurality based on the input signal and output a selected coefficient as the mapping result. ### Claim 16 (depends on 13) The communication device according to claim 13, further comprising: an adder configured to add outputs of the plurality of first selectors.