1. A dither system for a quantizing device comprising:
means for obtaining a dither signal from a clock signal having a sample frequency, the dither signal having a frequency that is one-third of the sample frequency;
means for combining the dither signal with an analog signal to be digitized at an input to the quantizing device;
means for generating from a digital version of the dither signal from the obtaining means a cancellation signal; and
means for combining the cancellation signal with a digital output signal from the quantizing device to produce a corrected digital output signal having reduced quantization distortion.
2. The dither system as recited in claim 1 wherein the obtaining means comprises:
a divide-by-three circuit having the clock signal as an input and the digital version of the dither signal as an output; and
means for filtering the digital version of the dither signal to produce as an output the dither signal for input to the dither signal combining means.
3. The dither system as recited in claim 2 wherein the obtaining means further comprises a low-jitter clock re-timing register having as an input the digital version of the dither signal and having as an output a re-timed digital version of the dither signal for input to the filtering means.
4. The dither system as recited in any of claims 1\u20133 wherein the cancellation signal generating means comprises:
means for translating the digital version of the dither signal into a direct digital version;
means for delaying the direct digital version by one cycle of the clock to produce a quadrature digital version;
means for multiplying the direct and quadrature digital versions by respective programmable coefficients to produce quadrature digital products; and
means for combining the quadrature digital products to produce the cancellation signal.
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. An aqueous seed treatment composition in the form of a suspension comprising
(A) abamectin in an amount from about 30 weight % to about 60 weight %, based on the total weight of the composition, and
(B) at least two surface active compounds in an amount from about 1 weight % to about 10 weight %, based on the total weight of the composition, wherein (i) at least one is alkylphenol polyalkoxyether phosphate, a block copolymer of polyalkoxyether phosphate, a polyarylphenol polyalkoxyether phosphate, an arylphenol polyalkoxyether phosphate, or mixtures thereof, and (ii) at least one is a non-ionic alkoxylated phenol.
2. The composition according to claim 1 wherein the molecular weight of the (B)(i) surface active compound is less than 2200.
3. The composition according to claim 1 wherein the molecular weight of the (B)(ii) surface active compound is less than 2200.
4. A slurry composition comprising the composition defined in claim 1, a liquid carrier and optionally (i) one or more formulation adjuvants, (ii) one or more other pesticidal compositions, each comprising at least one further pesticide, or both (i) and (ii).
5. The slurry composition according to claim 4 wherein one or more pesticidal compositions (ii) has a pH of less than 7.
6. A pest resistant plant propagation material comprising a plant propagation material treated with a pesticidally effective amount of the composition claimed in claim 1 to protect the plant propagation material from soil-dwelling pests.
7. An aqueous seed composition in the form of a suspension comprising an effective amount of the composition claimed in claim 1, wherein the molecular weight of B(i) is in the range 600 to 1200, and the molecular weight of B(ii) is in the range 600 to 1200, and (A) comprises abamectin.
8. A pest resistant plant propagation material comprising a plant propagation material treated with a pesticidally effective amount of the composition claimed in claim 7 to protect the plant propagation material from soil-dwelling pests.
9. A method of protecting plant propagation material from attack by soil-dwelling pests comprising treating the material with a pesticidally effective amount of the composition claimed in claim 1.
10. A method of protecting plant propagation material from attack by soil-dwelling pests comprising treating the material with a pesticidally effective amount of the composition claimed in claim 1, wherein the molecular weight of B(i) is in the range 600 to 1200, and the molecular weight of B(ii) is in the range 600 to 1200.