Device and method for polyphase resampling
View Patent ↗A methods and devices for polyphase resampling are presented which may comprise a coefficient generator which provides a plurality of coefficients and an interpolation arrangement used to carry out the resampling by means of the coefficients applied to input data provided for resampling in order to provide output data. In one possible implementation the coefficient generator is constructed and/or controlled so as to provide the coefficients for the resampling in the form of linearly interpolated coefficients. In another alternative implementation, a plurality of at least two data interpolation filters are provided for the interpolation of a corresponding number of parallel input data, wherein the coefficients are input to each of the data interpolation filters.
1. Device for polyphase resampling, provided with
a coefficient generator which provides a plurality of coefficients;
at least one interpolation circuit provided in the coefficient generator in order to generate coefficients from constant coefficients;
an interpolation arrangement for the realization of resampling by means of the coefficients based on input data to provide output data submitted for resampling wherein the coefficient generator is constructed and/or controlled in order to provide
coefficients for the resampling as linearly interpolated coefficients;
at least two multiplexers for multiplexing of a first coefficient sequence of coefficients at two inputs, respectively, of one of the interpolation circuits; and
a phase accumulator to provide one phase value out of a plurality of bits;
wherein the most significant bit in the plurality of the bits is input to the multiplexers in order to control these multiplexers, and the least significant bits in the plurality of the bits are input to the interpolation circuits.
2. The device according to claim 1 , wherein a plurality of at least two data interpolation filters are provided for interpolation of a corresponding number of parallel input data, wherein the coefficients are output to each data interpolation filter.
3. The device according to claim 2 , wherein the data interpolation filters are constructed as interpolation FIR filters.
4. The device according to claim 1 , wherein the number of the most significant bits is input to the multiplexers according to the number of the multiplexers, and the remaining plurality in the plurality of bits are input, respectively, to all the interpolation circuits.
5. The device according to claim 1 , provided with a plurality of at least two such interpolation circuits in the coefficient generator in order to generate coefficients from constant coefficients.
6. The device according to claim 1 , provided with a storage section or a data input for the input of constant coefficients.
7. The device according to claim 1 , provided with
a plurality of at least two interpolation circuits in which a coefficient generator is deployed for generation of internal coefficients and
a normalization circuit for the normalization of the internal coefficients.
8. A method for polyphase resampling comprising:
providing a plurality of coefficients using a coefficient generator;
generating the plurality of coefficients from a plurality of constant coefficients using at least one interpolation circuit;
resampling an interpolation arrangement by means of the coefficients based on input data to provide output data submitted for resampling, wherein the coefficient generator is constructed and/or controlled in order to provide coefficients for the resampling as linearly interpolated coefficients;
multiplexing a first coefficient sequence of coefficients at two inputs, respectively, of one of the interpolation circuits; and
providing one phase value out of a plurality of bits from a phase accumulator;
wherein the most significant bit in the plurality of the bits is input to the multiplexers in order to control these multiplexers, and the least significant bits in the plurality of the bits are input to the interpolation circuits.
9. The method of claim 8 wherein the number of the most significant bits is input to the multiplexers according to the number of the multiplexers and a remaining plurality in the plurality of bits are input, respectively, to all the interpolation circuits.
10. The method according to claim 8 , wherein internal coefficients which are generated and provided for the resampling are normalized with the coefficients which are to be used.
11. The method according to claim 8 , wherein the same coefficients are input to each data interpolation filter with a plurality of at least two data interpolation filters for the interpolation of a corresponding number of parallel input data.
12. The method according to claim 8 , wherein in the coefficient generator will generate coefficients from constant coefficients.