DISCRETE FOURIER TRANSFORM DEVICE
申请公布号:JPS6063676(A)
申请号:JP19830166861
申请日期:1983.09.10
申请公布日期:1985.04.12
发明人:KOBATA MINORU;SONE HIDEAKI;HAMADA TAKASHI;TAKAGI AI;HARA TOSHITO;WAKATSUKI NOBORU
分类号:G06F17/14;(IPC1-7):G06F15/332
主分类号:G06F17/14
摘要:<p>PURPOSE:To eliminate the need for a digital multiplier and perform discrete Fourier transform on real-time basis only by addition and subtraction by obtaining a discrete Fourier transform component in the form of the amplitude and phase angle of a sine wave outputted from a digital comb line filter. CONSTITUTION:An input signal is converted by an A/D converter 1 into a digital signal, which is written in an input memory 2 or 3. An adder/subtracter 4 performs convolutional arithmetic between the input signal and a rectangular wave. Higher harmonics of degree 3, 5, 7, etc., in the obtained convoluted waveform are removed by the comb line filter 8. The sine wave outputted by the comb line filter 8 is inputted to a peak value detecting circuit 9 and a zero-cross point detecting circuit 10 for one period to obtain its amplitude and phase angle. Those are equal to the Xk and arg(Xk) of the (k)th DET component Xk.</p>
METER OF SPECTRAL LUMINANCE FACTORS OF SEA SURFACE
TWO-STROKE GAS ENGINE WITH CROSS-FLOW SCAVENGING
ABSPANNKLEMME FUER SEILE, LEITER OD. DGL.
1,2,4-TRIAZINE UND PYRAZIN-DERIVATE.
VERFAHREN ZUR HERSTELLUNG NEUER CARBAZINSAEUREDERIVATE
STYRDON DER ELEKTRISKA STYRSIGNALER ALSTRAS VIA ETT FJEDERELEMENT
PROCEDIMENTO E APPARECCHIO PER LA DEPURAZIONE DI FUMI INDUSTRIALI.
HALVLEDARKOPPLINGSANORDNING FOR STYRNING OCH FORSTERKNING AV ELEKTROMAGNETISK STRALNING
ANORDNING FOR KOMBINERAD GREVSKOPA OCH TJELRIVARE
FILTERDUKSOSCILLERANDE ANORDNING FOR EN FILTERPRESS
ANLEGGNING FOR ATT TILLDELA ACCESS TILL EN BEHOVSDELAD ANLEGGNINGSDEL
MASKAGGREGAT, FOR ALTERNATIV ANSLUTNING DIREKT TILL EN PATIENT ELLER TILL EN AV DENNE BUREN GASMASK
Chair for public transport vehicle
Formation wires used for forming and/or dewatering suspensions
VORRICHTUNG ZUR BEFESTIGUNG EINES DECKELS AN EINEM GEHAEUSE, INSBESONDERE AN EINEM VENTILGEHAEUSE
PULVERGEMISCHE VON HOHEM PROPYLENGLYKOLGEHALT UND VERFAHREN ZUR HERSTELLUNG DERSELBEN.