Pulse or digital communications – Systems using alternating or pulsating current – Plural channels for transmission of a single pulse train
Patent
1995-04-07
1998-06-30
Chin, Stephen
Pulse or digital communications
Systems using alternating or pulsating current
Plural channels for transmission of a single pulse train
375328, 375349, 367 7, 12866101, 73602, 73625, H04L 512, A61B 800
Patent
active
057744998
ABSTRACT:
A signal demodulation apparatus using a multi-ary sampling for beam formation of a received signal reduces a difference between a sampling point of time of an in-phase signal and a sampling point of time of a quadrature signal due to an existing secondary sampling method. Each of a plurality of analog-to-digital converters produces a first in-phase signal and at least two first quadrature signals adjacent to the first in-phase by sampling each input signal input via a plurality of channels at a sampling point of time having a sampling period of the input signal and other sampling points of time having a sampling interval smaller than the sampling period of the input signal. A quadrature component calculator of each channel produces second quadrature signals in which an error due to a difference between the sampling point of time of the first in-phase signal and the sampling points of time of the first quadrature signal is reduced. A first accumulator accumulates first in-phase signals of all the channels to produce a second in-phase signal and a second accumulator accumulates second quadrature signals of all the channels to produce a third quadrature signal. The second in-phase signal and the third quadrature signal are used for detection of an envelope signal of the received signal. The apparatus can be used in a sonar and a radar as well as an ultrasonic image apparatus, rendering an effect capable of obtaining an in-phase signal and a quadrature signal from which an error due to a difference between sampling points of time is remarkably reduced compared with the existing secondary sampling method.
REFERENCES:
patent: 5581036 (1996-12-01), Chang et al.
patent: 5600675 (1997-02-01), Engeler
Ahn Young Bok
Cho Weon-hee
Chin Stephen
Le Amanda T.
Medison Co. Ltd.
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