1. A phase rotation method for a clock recovery, comprising the steps of:
providing a timing estimation value that indicates for each input data symbol at least whether an input data sample has been sampled early or late by a sampling clock signal;
generating a phase offset value indicating a phase rotation of the sampling clock signal based on the timing estimation value; and
modifying a timing function value that corresponds to an estimated timing difference relative to the sampling clock signal, based on a change of the phase offset value, resulting in the timing estimation value.
2. The phase rotation method according to claim 1, wherein the timing function corresponds to a Mueller-M\xfcller timing function.
3. The phase rotation method according to claim 2, wherein the timing function is calculated by a sum of terms, where each term multiplies a received input data sample with a decision-related data value.
4. The phase rotation method according to claim 2, wherein the timing function value is determined based on decision-related data values obtained by decision feed forward equalizing.
5. The phase rotation method according to claim 3, wherein the timing function value is determined based on decision-related data values obtained by decision feed forward equalizing.
6. The phase rotation method according claim 1, wherein the phase offset value is generated based solely on the sign of the timing estimation value.
7. The phase rotation method according to claim 3, wherein the phase offset value is generated based solely on the sign of the timing estimation value.
8. The phase rotation method according to claim 1, wherein the phase offset value is generated based on the sign and the amount of the timing estimation value.
9. The phase rotation method according to claim 3, wherein the phase offset value is generated based on the sign and the amount of the timing estimation value.
10. The phase rotation method according to claim 4, wherein decision-related data values are obtained based on a change of the phase offset value.
11. The phase rotation method according to claim 5, wherein decision-related data values are obtained based on a change of the phase offset value.
12. The phase rotation method according to claim 1, wherein the phase offset value is generated as the outcome of a second-order control loop, based on the timing estimation value as input.
13. The phase rotation method according to claim 1, wherein the timing function value is modified based on an amplitude correction value that is based on a gradient of an impulse response characteristics of the data channel close to a zero crossing.
14. The phase rotation method according to claim 13, wherein the amplitude correction value is further generated depending on a change of the phase offset value for a given number of symbolscycles.
15. The phase rotation method according to claim 14, wherein the given number of cycles is selected based on the latency required for generating the phase offset value based on the timing estimation value.
16. The phase rotation method according to claim 1, wherein modifying the timing function value is performed such that a change of the phase offset value shifting the sampling clock signal to late is responded to by a corresponding value for an amplitude correction offset, which effects a change of the phase offset value shifting the sampling clock signal to early, and such that a change of the phase offset value shifting the sampling clock signal to early is responded to by a corresponding value for the amplitude correction offset, which effects a change of the phase offset value shifting the sampling clock signal to late.
17. A clock recovery method for recovering a clock from an incoming data stream, wherein data samples are obtained from the incoming data stream by sampling based on a sampling clock signal, wherein the sampling clock signal has a phase rotation based on a phase offset value.
18. The clock recovery method according to claim 17, wherein the phase offset value is generated based solely on the sign of a timing estimation value.
19. The clock recovery method according to claim 17, wherein the phase offset value is generated based on a sign and a amount of a timing estimation value.
20. A clock recovery apparatus, comprising:
an analog digital converter means for sampling an incoming data stream to obtain input data samples;
a timing estimation means that is configured to:
provide a timing estimation value that indicates for each of input data symbol at least whether an input data sample has been sampled early or late by a sampling clock signal,
modify a timing function value which corresponds to an estimated timing difference relative to the sampling clock signal, based on a change of the phase offset value resulting in the timing estimation value; and
a phase rotation means for generating a phase offset value indicating a phase rotation of the sampling clock signal based on the timing estimation value.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A system for influencing the rheological properties of a conveyable material, wherein the system is or can be allocated to a machine for machining or processing the conveyable material, in which the conveyable material is transported along a conveying direction the system comprising:
a) at least one controllable impact system for generating and introducing mechanical oscillations in the material in at least one machining section of the machine, along with
b) at least one acquisition system for acquiring the rheological properties of the material; wherein
c) the acquired rheological properties are used as the basis for actuating the impact system for generating and introducing the mechanical oscillations,
d) the acquisition system has a first means for determining the velocity field transverse to the conveying direction in an area of the material, and a second means for determining the pressure difference along the conveying direction in the area andor at the edge of the area of the material.
2. A system for influencing the rheological properties of a conveyable material, wherein the system is or can be allocated to a machine for machining or processing the conveyable material, in which the conveyable material is transported along a conveying direction, the system comprising:
a) at least one controllable impact system for generating and introducing mechanical oscillations in the material in at least one machining section of the machine, along with
b) at least one acquisition system for acquiring the rheological properties of the material; wherein
c) the acquired rheological properties are used as the basis for actuating the impact system for generating and introducing the mechanical oscillations,
d) the acquisition system has a first means for determining the velocity field transverse to the conveying direction in an area of the material, and a second means for determining the shearing stress along the conveying direction at the edge of or inside the area of the material.
3. The system according to claims 1 or 2, wherein several impact systems for mechanical oscillations are provided.
4. The system according to claims 1 or 2, wherein at least one impact system for mechanical oscillations can be actuated independently of the operating status of the machine.
5. The system according to claims 1 or 2, wherein several impact systems for mechanical oscillations can be actuated separately from each other.
6. The system according to claims 1 or 2, wherein a first acquisition system for acquiring the rheological properties of the conveyable material is arranged downstream from the machining section in order to generate first signals, which characterize the physicochemical, in particular rheological properties of the material downstream from the machining section.
7. The system according to claim 6, wherein a second acquisition system for acquiring the rheological properties of the conveyable material is arranged upstream from the machining section in order to generate second signals, which characterize the physicochemical, in particular rheological properties of the material upstream from the machining section.
8. A machine according to claim 7, wherein the first signals andor the second signals are compared with respective reference values, which characterize specific rheological properties, wherein feedback takes place within a control circuit as a function of the result from comparing the signals to activate the at least one impact system for mechanical oscillations.
9. A machine according to claim 7, wherein the first signals andor the second signals are compared with each other, wherein feedback takes place within a control circuit as a function of the result from comparing the signals to activate the at least one impact system for mechanical oscillations.
10. A system according to claim 1 or 2, wherein the conveyable material comprises a pourable material, a pasty powder or a loose material.