Digital filter
阅读：534发布：2022-11-09
专利汇可以提供Digital filter专利检索，专利查询，专利分析的服务。并且An improved filter technique, as for example, for use with ladder digital filters which allows any LC-ladder filter to be simply translated into a corresponding digital structure. If one of the characteristics of an adaptor is chosen equal to unity, the output of that adaptor will be independent of the input which means that the direct path between the input and output is interrupted, thus eliminating undesirable closed loops to exist. The invention also provides for isolation between input and output ports in filter elements without the use of delay devices.，下面是Digital filter专利的具体信息内容。
1. A filter with frequency-dependent transmission properties for an electrical analog signal which has been converted to digital form, the filter comprising a basic filter circuit which corresponds to an analog LC circuit for analog signals, said basic filter circuit comprising reactive single port circuit means having transit time for realizing inductive and capactive two-terminal circuit elements of said analog LC circuit, nonreactive circuit means for realizing non-reactive circuit elements of said analog LC circuit, said reactive circuit means and said non-reactive circuit means having respective ports with respective different port impedances in accordance with the parameters of said analog LC circuit, and interface means for interconnecting the reactive and non-reactive circuit means in accordance with the configuration of said analog LC circuit and comprising adaptors for providing impedance matching between the circuit means, each adaptor having a plurality of adaptor ports and comprising an adaptor circuit including adders and multipliers connected with the adaptor ports thereof and determining the respective port impedances of such adaptor ports and such that there is impedance matching at each port of each adaptor to the impedance of the associated connected port, wherein the improvement comprises: a plurality of said adaptors being directly connected, respective pairs of directly connected adaptors each having respective directly connected adaptor ports including respective port input and port output units, the respective port output units of the respective directly connected adaptor ports of each pair of directly connected adaptors being directly connected to the respective port input units of the respective other one of the directly connected adaptor ports, and one adaptor of each pair of directly connected adaptors having at least three adaptor ports including the directly connected adaptor port thereof and the associated adaptor circuit providing decoupling between the port input and the port output unit of the last mentioned directly connected adaptor port, and the directly connected adaptor ports of the respective pairs of directly connected adaptors having matched port impedances.
2. A filter according to claim 1, where the one adaptor of each pair of directly corrected adaptors with at least three adaptor ports including the directly connected adaptor port has its associated adaptor circuit providing decoupling between the port input and the port output unit of such directly connected adaptor port by using a multiplier in the circuit for such directly connected adaptor port which has a multiplication factor of one or is replaced by a direct connection.
3. A filter according to claim 2, wherein an adaptor of a pair of directly connected adaptors with at least four adaptor ports including the directly connected adaptor port has n ports with respective port impedances, and has p respective port impedances of equal value, the associated adaptor circuit having m multipliers excluding any multiplier with a multiplication factor of one in the circuit for such directly connected adaptor port, where m is not greater than n minus p.
4. A filter according to claim 1 wherein a plurality of directly connected adaptors are combined to form a derived adaptor having an equivalent electric circuit.
5. In a filter with frequency-dependent transmission properties for an electrical analog signal which has been converted to digital form, the filter comprising reactive single port circuit means having transit time for realizing inductive and capactive elements of an analog circuit and having respective ports with respective different port impedances in accordance with the parameters of said analog circuit, and interface means for interconnecting the reactive single port circuit means in accordance with the configuration of said analog circuit and effectively comprising adaptors for providing impedance matching between the circuit means, each adaptor having a plurality of adaptor ports and the adaptors comprising adaptor circuits including adders And multipliers connected with the adaptor ports thereof and determining the respective port impedances of such adaptor ports and such that there is impedance matching at each port of each adaptor to the impedance of an associated connected port, wherein the improvement comprises: the filter effectively including a plurality of directly connected adaptors each pair of such directly connected adaptors having respective directly connected adaptor ports including respective port input and port output units, the respective port output units of the respective directly connected adaptor ports of said pair of directly connected adaptors being directly connected to the respective port input units of the respective other one of the directly connected adaptor ports, and one adaptor of said pair of directly connected adaptors comprising a parallel adaptor with at least three adaptor ports including the directly connected adaptor port and having a parallel adaptor circuit including adder and multiplier components such that if the adaptor ports are designated generically by the letter v and v is assigned the integer values 1, 2, . . . , n when specifying respective individual ones of such adaptor ports, the value n being taken as specifying the directly connected adaptor port, and if each multiplier component of the parallel adaptor circuit of such parallel adaptor is assigned a multiplication factor generically designated Alpha v and is considered to be associated with an adaptor port having a port impedance Rv, then Alpha v 2 Gv/G where Gv 1/Rv and G G1 + G2 + . . . + Gn, the multiplication factor Alpha n associated with the directly connected adaptor port being chosen to equal one so that Gn G1 + G2 . . . + Gn
6. In a filter with frequency-dependent transmission properties for an electrical analog signal which has been converted to digital form, the filter comprising reactive single port circuit means having transit time for realizing inductive and capactive elements of an analog circuit and having respective ports with respective different port impedances in accordance with the parameters of said analog circuit, and interface means for interconnecting the reactive single port circuit means in accordance with the configuration of said analog circuit and effectively comprising adaptors for providing impedance matching between the circuit means, each adaptor having a plurality of adaptor ports and the adaptors comprising adaptor circuits including adders and multipliers connected with the adaptor ports thereof and determining the respective port impedances of such adaptor ports and such that there is impedance matching at each port of each adaptor to the impedance of an associated connected port, wherein the improvement comprises: the filter effectively including a plurality of directly connected adaptors each pair of such directly connected adaptors having respective directly connected adaptor ports including respective port input and port output units, the respective port output units of the respective directly connected adaptor ports of said pair of directly connected adaptors being directly connected to the respective port input units of the respective other one of the directly connected adaptor ports, and one adaptor of said pair of directly connected adaptors comprising a series adaptor with at least three adaptor ports including the directly connected adaptor port and having a series adaptor circuit including adder and multiplier components such that if the adaptor ports are designated generically by the letter v and v is assigned the integer values 1, 2, . . . , n when specifying respective individual ones of such adaptor ports, the value n being taken as specifying the directly connected adaptor port, and if each multiplier component of tHe series adaptor circuit of such series adaptor is assigned a multiplication factor generically designated Alpha v and is considered to be associated with an adaptor port having a port impedance Rv, then Alpha v Rv/R where R R1 + R2 + . . . + Rn, the multiplication factor Alpha n associated with the directly connected adaptor port being chosen to be equal to one so that Rn, the port impedance of such directly connected adaptor port, satisfies the relation Rn R1 + R2 + . . . + Rn 1.
7. A ladder filter effectively comprisingg a plurality of cascaded adaptors each having an input port, an output port and at least one further port with respective port impedances, reactance circuit elements having ports with port impedances in accordance with the reactance values represented thereby connected with the further ports of the adaptors, each of the adaptors including adders and multipliers connected with the ports thereof and determining the port impedances for matching the port impedance of each further port to the port impedance of the connected reactance circuit element, and for matching the respective port impedances of the input port and output port with those of the respective connected output port and input port of respective preceding and succeeding adaptors cascaded therewith, at least certain of the adaptors being equivalent to cascaded directly connected parallel and series adaptors, one such directly connected adaptor having respective adaptor ports designated v where v 1, 2, . . . , n, the multiplier constants Alpha v for the multipliers associated with such ports being selected to provide impedance matching at the respective ports of such directly connected adaptor and including a multiplier with a multiplier constant Alpha n, associated with the directly connected port of said directly connected adaptor, the value of such multiplier Alpha n being set equal to 1.
8. A ladder filter according to claim 7 with the one ddirectly connected adaptor being a parallel adaptor with its multipliers having multiplier constants satisfying the relationship Alpha v Gv/G where Gv is equal to the reciprocal of the port impedance of the associated port, and G G1 + G2 + . . . + Gn, the reciprocal of the port impedance of the directly connected port being designated Gn and satisfying the relation Gn G1 + G2 + . . . + Gn 1.
9. A ladder filter according to claim 7 with the one directly connected adaptor being a series adaptor with its multipliers having multiplier constants satisfying the relationship Alpha v Rv/R where Rv is the port impedance of the associated port and R R1 + R2 + . . . + Rn, the port impedance of the directly connected port being designated Rn and satisfying the relation Rn R1 + R2 + . . . + Rn 1.
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