1. A method of averaging and displaying a digital signal converted from an analog signal, the analog signal received by a signal processing instrument, and the method comprising:
receiving the analog signal from an input of the signal processing instrument;
converting the analog signal to the digital signal;
storing in memory a plurality of data acquisitions of the digital signal;
identifying a number of rising edges and a number of falling edges identifiable in a single acquisition of the plurality of acquisitions;
counting the number of rising edges and the number of falling edges;
calculating an average waveform from the plurality of acquisitions, the waveform representing the digital signal and the average further calculated from the count of the number of rising and falling edges; and
displaying the average waveform on a display coupled to the signal processing instrument.
2. The method of claim 1, further comprising storing the number of rising edges and the number of falling edges in memory.
3. The method of claim 1, further comprising centering an aperture on each edge of the single acquisition.
4. The method of claim 3, further comprising allocating an integer value to each sampling bin boundary located within the aperture.
5. The method of claim 4, further comprising summing integer values for the rising edges together and summing the integer values for the falling edges together across the plurality of acquisitions.
6. The method of claim 5, further comprising identifying a rough edge by locating a group of one or more sampling bin boundaries for which a sum of the integer values equals a total number of the plurality of acquisitions.
7. The method of claim 6, further comprising calculating a weighted average from the rough edge in order to determine an averaged edge.
8. The method of claim 7, further comprising calculating an offset from the averaged edge and determining in which sampling bin boundary the averaged edge may be placed using the offset.
9. The method of claim 8, further comprising aggregating the averaged edges with corresponding offsets to comprise the average waveform representing the plurality of acquisitions.
10. The method of claim 9, further comprising adjoining a dwell on each edge of the single acquisition.
11. The method of claim 10, further comprising examining the dwells for like-kind edges in the single acquisition to determine whether they overlap.
12. The method of claim 11, further comprising electing not to count like-kind edges with overlapping dwells and not to store the counts of like-kind edges in memory.
13. The method of claim 12, further comprising electing not to allocate integer values for each sampling bin boundary that coincides with like-kind edges that have overlapping dwells.
14. The method of claim 13, further comprising identifying the rough edge by locating an edge of opposite polarity in close proximity to the rough edge, the edge of opposite polarity identifiable as the group of one or more sampling bin boundaries for which the sum of the integer values equals the total number of the plurality of acquisitions.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
What is claimed is:
1. A digital signal receiver comprising:
an input terminal for receiving an input signal with digitally-modulated;
at least two variable gain amplifiers coupled in series to said input terminal for controlling the level of the input signal;
an analog-to-digital (AD) converter for receiving an output of said variable gain amplifier;
a level comparator coupled to an output of said AD converter for comparing a level of the output of said AD converter and a reference level;
a loop filter coupled to said level comparator; and
a control voltage generator for generating control voltages for controlling said variable gain amplifiers based on an output of said loop filter,
wherein an operation-starting point of any of said variable gain amplifiers is shifted with using the control voltages.
2. The digital signal receiver according to claim 1, wherein the operation-starting point is shifted when the operation-starting point is the same as a level of the input signal.
3. The digital signal receiver according to claim 1, wherein the operation-starting point is shifted when a level of the input signal is at a saturation point of said any of said variable gain amplifiers.
4. The digital signal receiver according to claim 1, wherein the operation-starting point is shifted based on an average of the control voltage for said any of said variable gain amplifiers and a fluctuation frequency of the control voltage for said any of said variable gain amplifier.
5. The digital signal receiver according to claim 1, wherein the operation-starting point is shifted based on an average of the control voltage for said any of said variable gain amplifier and a level fluctuation amplitude of the input signal.
6. The digital signal receiver according to claim 1, wherein the operation-starting point is shifted based on the control voltage for said any of said variable gain amplifier and an electric power ratio of an adjacent channel and a desired channel.
7. A digital signal receiver comprising:
an input terminal for receiving an input signal with digitally-modulated,
at least two variable gain amplifiers coupled in series to said input terminal for controlling the level of the input signal,
an analog-to-digital (AD) converter for receiving an output of said variable gain amplifier,
a level comparator coupled to an output of said AD converter for comparing a level of the output of said AD converter and a reference level,
a loop filter coupled to said level comparator, and
a control voltage generator for generating control voltages for controlling said variable gain amplifiers from an output of said loop filter, wherein a bandwidth of said loop filter is controlled with using the control voltages.
8. The digital signal receiver according to claim 7, wherein the bandwidth is controlled based on average values of the control voltages and fluctuation frequencies of the control voltages.
9. The digital signal receiver according to claim 7, wherein the bandwidth is controlled based on average values of the control voltages and a level fluctuation amplitude of the input signal.
10. A digital signal receiver comprising:
an input terminal for receiving an input signal with digitally-modulated,
a variable gain amplifier coupled to said input terminal for controlling a level of the input signal,
an analog-to-digital (AD) converter for receiving an output of said variable gain amplifier,
a demodulator for demodulating an output of said AD converter, and
a ghost detector coupled to an output of said demodulator for detecting a delay time of ghost, comprising:
a delay unit for delaying the output of said demodulator,
a ghost calculator for calculating the delay time and an energy of ghost,
a coefficient unit, and
an averaging unit for calculating a coefficient of said coefficient unit,
wherein a number of times of averaging at said averaging unit is controlled based on the delay time.
11. A digital signal receiver comprising:
an input terminal for receiving an input signal with digitally-modulated,
a variable gain amplifier coupled to said input terminal for controlling a level of the input signal,
an analog-to-digital (AD) converter for receiving an output of said variable gain amplifier,
a level comparator coupled to an output of said AD converter for comparing a level of the output of said AD converter and a reference level,
a loop filter coupled to said level comparator,
a demodulator for demodulating the output of said AD converter, and
a ghost detector coupled to an output of said demodulator for calculating a delay time of ghost,
wherein an operation-starting point of said variable gain amplifier is shifted based on the delay time.
12. A digital signal receiver comprising:
an input terminal for receiving an input signal by digitally-modulated;
a variable gain amplifier coupled to said input terminal for controlling a level of the input signal,
an analog-to-digital (AD) converter for receiving an output of said variable gain amplifier;
a level comparator coupled to an output of said AD converter for comparing a level of the output of said AD converter and a reference level,
a loop filter connected to said level comparator,
a demodulator for demodulating the output of said AD converter, and
a ghost detector connected to an output of said demodulator for calculating a delay time of ghost,
wherein a bandwidth of said loop filter is controlled based on the delay time.
13. A digital signal receiver comprising:
an input terminal for receiving an input signal with digitally-modulated;
a variable gain amplifier coupled to said input terminal for controlling a level of the input signal;
an analog-to-digital (AD) converter for receiving an output of said variable gain amplifier;
a level comparator coupled to an output of said AD converter for comparing a level of the output of said AD converter and a reference level,
a loop filter coupled to said level comparator, and
a carrier-to-noise (CN) ratio detector coupled to the output of said AD converter for detecting a carrier-to-noise (CN) ratio of an input signal into said AD converter,
wherein an operation-starting point of said variable gain amplifier is shifted based on the CN ratio.
14. A digital signal receiver comprising:
an input terminal for receiving an input signal by digitally-modulated;
a variable gain amplifier coupled to said input terminal for controlling a level of the input signal,
an analog-to-digital (AD) converter for receiving an output of said variable gain amplifier;
a level comparator coupled to an output of said AD converter for comparing a level of the output of said AD converter and a reference level,
a loop filter coupled to said level comparator, and
a carrier-to-noise (CN) ratio detector coupled to the output of said AD converter for detecting a carrier-to-noise (CN) ratio of an input signal into said AD converter,
wherein a bandwidth of said loop filter is controlled based on the CN ratio.