Spectrum analyzer
阅读：181发布：2022-10-13
专利汇可以提供Spectrum analyzer专利检索，专利查询，专利分析的服务。并且A signal spectrum analyzer generates the discrete Fourier coefficients of a sampled-data signal applied as input thereto by repetitively passing sets of data points through the same configuration-invariant transform network to thereby achieve high transformation speed with minimal system complexity.，下面是Spectrum analyzer专利的具体信息内容。
1. A signal analyzer for generating the discrete Fourier coefficients of a digital data sequence of N data points applied as input thereto, said analyzer comprising a counter which repetitively cycles through a count of N, means for storing the data in successive memory locations corresponding to the successive states of the counter which repetitively cycles through a count of N, means for sequentially retrieving the data in subsets of m points at a time from memory locations derived from the reverse count of the counter, means for phase shifting each sequentially retrieved data point in accordance with a phase factor derived from the reverse count of said counter, means for accumulating the phase shifted data points in selected ones of at least one set of m registers in accordance with a data weighting factor derived from the reverse count of said counter, and means for storing the contents of said registers in corresponding ones of the locations from which the data points were retrieved, thereby to complete a pass for said data points.
2. A signal analyzer in accordance with claim 1 including means for generating a pass number from 1 to logmN and means for applying said number to the data retrieving means and the data accumulating means for controlling the derivation of the memory locations from which data is retrieved and the deviation of the weighting factors applied to the retrieved data.
2. gating means for gating the inputs applied to said butterfly into selected ones of said accumulators in accordance with the order in which said inputs are presented thereto.
2. means for applying the modified count to said storage means as the address of data points to be selected for processing.
3. A signal analyzer according to claim 2 in which the data retrieving means includes a data address generator for generating the addresses of the data to be read from memory, said address generator comprising a shift register, means for applying the count in said counter in reverse sequence to said shift register, means for shifting the reverse count in said register by a factor dependent on the pass number; and means for annexing the digits shifted out of said register during said shift operation onto the end of the count opposite the end from which they were shifted.
4. A signal analyzer according to claim 3 in which said shift register shifts said reverse count by a factor of 2(P - 1) places to the right, where P is the pass number, and the annexing means prefixes the reverse count in said counter with the bits shifted out of said counter.
5. A signal spectrum analyzer for generating the discrete fourier coefficients of an N point input signal applied thereto, comprising means for selecting N/m successive m-point subsets of the N-point input for processing. phase correction means connected to multiply successive points presented thereto by selected phase correction factors thereby to produce phase corrected signals, means for presenting successive m-point subsets to said phase correction means, a butterfly network connected to said phase corrected signals for multiplying the points of successive subsets of phase-corrected points presented as input thereto by the same selected groups of weighting factors for each subset and providing an output for each input applied thereto. storage means connected to said butterfly network for storing the outputs of said butterfly network.
6. A signal spectrum analyzer according to claim 5 in which the phase correction means includes storage means having a plurality of phase correction factors comprising the real and imaginary components of the factor
7. A signal spectrum analyzer according to claim 5 in which said phase correction means includes storage means having stored therein phase-correction factors for application to said butterfly.
8. A signal spectrum analyzer according to claim 7 in which the phase-correction factor storage means stores said factors at addresses corresponding to arguments of
9. A signal spectrum analyzer according to claim 5 in which said selection means selects points for processing in subsets of four points each, in which the butterfly network comprises
10. A signal spectrum analyzer according to claim 9 in which said butterfly network includes first and second set of accumulators, first and second gating networks connected to the respective accumulator sets, said first accumulator set including means for storing multiplier products corresponding to real products and said second accumulator set including means for storing products corresponding to imaginary products.
11. A signal spectrum analyzer according to claim 10 in which said weighting factors are given by
12. A signal spectrum analyzer according to claim 5 further including means for applying the outputs of said butterfly network to said storage means for storage therein in a specified sequence, and means for generating a reverse binary count, said selection means including
13. A signal spectrum analyzer according to claim 12 wherein said presenting means includes means for establishing at least one reiteration of the phase correction and weighting factor multiplication on a different group of m-point subsets.
14. A signal spectrum analyzer according to claim 13 in which the selecting means selects said inputs in subsets of m 4, and in which said weighting means is constructed to multiply the phase-corrected points by factors of + or - or -1 and + or -j only.
15. A signal spectrum analyzer according to claim 14 in which the means for establishing at least one reiteration includes means for generating a binary count corresponding to the phase correction and weighting of successive groups of N-points, which includes means in said selection means responsive to said count to establish the length of the shift to be performed during the processing of a selected group of points.
16. A signal spectrum analyzer according to claim 15 in which said butterfly network provides m successive outputs for each m-point applied thereto, and which includes means for applying said outputs to the same address in storage from which they were derived.
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