MEDICAL DIAGNOSTIC SIGNAL DETECTION APPARATUS AND MEDICAL DIAGNOSTIC SIGNAL DETECTION METHOD

摘要

In a system including analog circuits of multichannel, channels which have a short distance therebetween are grouped so as to be included in the same group. During a reception period, a common correction signal is supplied to master channels allocated to the respective groups, and received signals are supplied to slave channels other than the master channels. A correction coefficient which tracks a characteristic fluctuation of each group is continuously searched for through continuous comparison between outputs of the respective master channels, and an output of each slave channel is corrected by using the correction coefficient of a group including the slave channel.

主权项

1. A medical diagnostic signal detection apparatus comprising:
a first amplifier; a first analog-digital converter whose input side is electrically connected to an output side of the first amplifier; second and third amplifiers; second and third analog-digital converters whose input sides are respectively electrically connected to output sides of the second and third amplifiers, the first to third amplifiers and the first to third analog-digital converters forming a first group and being integrated on a first semiconductor substrate; a fourth amplifier; a fourth analog-digital converter whose input side is electrically connected to an output side of the fourth amplifier; fifth and sixth amplifiers; fifth and sixth analog-digital converters whose input sides are respectively electrically connected to output sides of the fifth and sixth amplifiers, the fourth to sixth amplifiers and the fourth to sixth analog-digital converters forming a second group and being integrated on a second semiconductor substrate or the first semiconductor substrate; an inter-group correction signal generator whose output is input to the first and fourth amplifiers; first to fourth medical diagnostic signal detectors that respectively detect first to fourth medical diagnostic signals, outputs of the first to fourth medical diagnostic signal detectors being respectively input to the second, third, fifth and sixth amplifiers; first inter-group correction coefficient search means connected to an output side of the fourth analog-digital converter forming a master channel of the second group; and first and second inter-group correction means respectively connected to output sides of the fifth and sixth analog-digital converters, wherein an output of the fourth analog-digital converter and an output of the first analog-digital converter forming a top master channel are input to the first inter-group correction coefficient search means, wherein the first inter-group correction coefficient search means searches for a first mismatch amount regarding a gain, a DC offset, a sampling timing, or a frequency bandwidth of a circuit in the second group relative to a circuit in the first group through comparison between the two input values, so as to obtain a first correction coefficient which is used to correct the gain, the DC offset, the sampling timing, or the frequency bandwidth of the circuit in the second group and is proportional or directly proportional to the first mismatch amount, wherein the first correction coefficient is input to the first and second inter-group correction means, and wherein the first and second inter-group correction means perform inter-group correction on outputs of the fifth and sixth analog-digital converters through digital addition calculation, digital subtraction calculation, digital multiplication calculation, or digital division calculation using the first correction coefficient.