1. A multi-rate data modulation circuit comprising:
a multi-rate data conversion circuit that receives digital data at varying data rates, that receives a data rate input corresponding to the digital data and that converts the digital data to a converted output based upon the data rate input; and
a modulator circuit that receives the converted output and that synthesizes a modulated output signal based upon the converted output,
wherein the multi-rate data conversion circuit is capable of transitioning smoothly between data rates at any time, as controlled by the data rate input, said multi-rate conversion circuit comprising a single multi-rate digital data filter that receives converted digital data and produces a filtered digital output, and an output scaler that receives the filtered digital output and produces a scaled and filtered digital output.
2. The multi-rate data modulation circuit of claim 1, wherein the modulator circuit comprises a direct digital synthesis circuit.
3. The multi-rate data modulation circuit of claim 1, the multi-rate data conversion circuit comprising:
a multi-rate converter that receives the digital data, the data rate input and a clock signal and converts the digital data to converted digital data; and
an adder that combines the scaled and filtered digital output with a center frequency input and produces the converted output.
4. The multi-rate data modulation circuit of claim 3, the multi-rate digital data filter including a look-up table that produces filter parameters based upon the converted digital data and that operates at multiple data rates.
5. The multi-rate data modulation circuit of claim 3, the multi-rate digital data filter comprising:
a digital data filter look-up table;
a data rate decode circuit that receives the data rate input and that produces control signals therefrom;
a plurality of multiplexors, each of which receives a portion of the converted digital data and control signals from the data rate decode circuit; and
the multiplexors selectively providing the converted digital data to the digital data filter look-up table to produce the filtered digital output.
6. The multi-rate data modulation circuit of claim 2, the direct digital synthesis circuit comprising:
a phase accumulator that receives the converted output;
quadrant logic coupled to the phase accumulator that receives an output of the phase accumulator;
a direct digital synthesis memory coupled to the quadrant logic that receives an output of the quadrant logic;
an unsigned converter coupled to the direct digital synthesis memory that receives an output of the direct digital synthesis memory and produces an unsigned output; and
a digital to analog converter coupled to the unsigned converter that receives the unsigned output and produces the modulated output signal.
7. The multi-rate data modulation circuit of claim 1, wherein the multi-rate data modulation circuit operating to couple a single bit of data to each cycle of the modulated output signal during a first time period and operating to couple two bits of data to each cycle of the modulated output signal during a second time period.
8. The multi-rate data modulation circuit of claim 7, the multi-rate data modulation circuit further operating to couple three bits of data to each cycle of the modulated output signal during a third time period.
9. A wireless network device comprising:
data processing circuitry that produces digital data at varying data rates;
a multi-rate data conversion circuit that receives the digital data at the varying data rates from the data processing circuitry, that receives a data rate input corresponding to the digital data and that converts the digital data to a converted output based upon the data rate input;
a modulator circuit that receives the converted output and that synthesizes a modulated output signal based upon the converted output; and
a radio that receives the modulated output signal and transmits the modulated output signal;
wherein the multi-rate data conversion circuit supplies an output dependent upon current data rate requirements, and accommodates a changed data rate in response to a change in the data rate input without requiring the loading of new radio programming prior to receipt of a new data rate.
10. The wireless network device of claim 9, wherein the modulator circuit is a direct digital synthesis circuit.
11. The wireless network device of claim 9, further comprising:
demodulation circuitry that demodulates the modulated receive signal to produce a demodulated input signal; and
data conversion circuitry that receives the demodulated input signal, that produces converted digital data and that transmits the converted digital data to the data processing circuitry.
12. The wireless network device of claim 9, the multi-rate data conversion circuit comprising:
a multi-rate converter that receives the digital data, the data rate input and a clock signal and converts the digital data to converted digital data;
a multi-rate digital data filter that receives the converted digital data and produces a filtered digital output;
an output scaler that receives the filtered digital output and produces a scaled and filtered digital output; and
an adder that combines the scaled and filtered digital output with a center frequency input and produces the converted output.
13. The wireless network device of claim 12, the multi-rate digital data filter including a look-up table that produces filter parameters based upon the converted digital data and that operates at multiple data rates.
14. The wireless network device of claim 12, the multi-rate digital data filter comprising:
a digital data filter look-up table;
a data rate decode circuit that receives the data rate input and that produces control signals therefrom;
a plurality of multiplexors, each of which receives a portion of the converted digital data and control signals from the data rate decode circuit; and
the multiplexors selectively providing the converted digital data to the digital data filter look-up table to produce the filtered digital output.
15. The wireless network device of claim 10, the direct digital synthesis circuit comprising:
a phase accumulator that receives the converted output;
quadrant logic coupled to the phase accumulator that receives an output of the phase accumulator;
a direct digital synthesis memory coupled to the quadrant logic that receives an output of the quadrant logic;
an unsigned converter coupled to the direct digital synthesis memory that receives an output of the direct digital synthesis memory and produces an unsigned output; and
a digital to analog converter coupled to the unsigned converter that receives the unsigned output and produces the modulated output signal.
16. The wireless network device of claim 9, wherein the multi-rate data modulation circuit operating to couple a single bit of data to each cycle of the modulated output signal during a first time period and operating to couple two bits of data to each cycle of the modulated output signal during a second time period.
17. The wireless network device of claim 16, the multi-rate data modulation circuit further operating to couple three bits of data to each cycle of the modulated output signal during a third time period.
18. A multi-rate data modulation circuit comprising:
first means for receiving digital data at varying data rates, for receiving a data rate input corresponding to the digital data and for converting the digital data to a converted output based upon the data rate input; and
second means for receiving the converted output and for synthesizing a modulated output signal based upon the converted output,
said first means for transitioning smoothly between data rates at any time, as controlled by the data rate input.
19. A multi-rate data modulation circuit comprising:
a multi-rate data conversion circuit that receives digital data at varying data rates, that receives a data rate input corresponding to the digital data and that converts the digital data to a converted output based upon the data rate input; and
a modulator circuit that receives the converted output and that synthesizes a modulated output signal based upon the converted output,
wherein the multi-rate data conversion circuit transitions smoothly between data rates at any time, as controlled by the data rate input, and accommodates a changed data rate in response to a change in the data rate input without requiring the loading of new radio programming prior to receipt of a new data rate.
20. The multi-rate data modulation circuit of claim 19, wherein the multi-rate conversion circuit comprises a multi-rate filter that receives multiple samples of input data, and based upon the values of the multiple samples, selects filtering functions to produce filtered data.
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 terminal contact assembly for mounting to an electronic component adapted for use in an aerospace vehicle, the electronic component defining an interior and an exterior and having an opening therebetween, the contact assembly comprising:
a terminal contact positionable within the opening in the electronic component, the terminal contact having inner and outer ends;
an outer insulator having an inner face engageable with the electronic component and a generally conical recessed surface extending about the terminal contact; and
a deformable o-ring positioned about the terminal contact within the opening through the electronic component for hermetically sealing the interior of the electronic component, the o-ring having an outer surface engageable with the recessed surface of the outer insulator.
2. The assembly of claim 1 further comprising an inner insulator positioned within the interior of the electronic component adjacent the o-ring.
3. The assembly of claim 1 wherein the inner insulator includes an enlarged head positioned on the interior of the electronic component and neck extending therefrom, the neck being receivable in the opening in the electronic component.
4. The assembly of claim 2 wherein the terminal contact includes a radially extending disc projecting therefrom.
5. The assembly of claim 4 further comprising a torque generating structure engageable with the inner and the outer insulation for generating a deforming force on the o-ring.
6. The assembly of claim 5 wherein the torque generating structure includes a nut threadable on the inner end of the terminal contact for compressing the inner and the outer insulation between the disc and the nut.
7. A terminal contact assembly for mounting to an electronic component defining an interior and an exterior and having an opening therebetween, the contact assembly comprising:
a terminal contact extending through the opening in the electronic component, the terminal contact having inner and outer ends;
a deformable o-ring having an outer surface and being positioned about the terminal contact within the opening through the electronic component;
an inner insulator positioned within the interior of the electronic component adjacent the o-ring; and
an outer insulator having a generally conical recessed surface engageable with the outer surface of the o-ring and extending about the terminal contact, the outer insulator and the inner insulator capturing the o-ring therebetween; and
a torque generating structure for generating a deforming force on the o-ring such that the o-ring seals the opening through of the electronic component.
8. The assembly of claim 7 wherein the inner insulator includes an enlarged head positioned on the exterior of the electronic component and a neck extending therefrom, the neck being receivable in the opening in the electronic component.
9. The assembly of claim 7 wherein the terminal contact includes a radially extending disc projecting therefrom.
10. The assembly of claim 9 wherein the torque generating structure includes a nut threadable on the inner end of the terminal contact for compressing the inner and outer insulators between the disc and the nut.
11. The assembly of claim 9 wherein the inner insulator is formed from a high friction resistance material.
12. A terminal contact assembly for mounting to an electronic component, the electronic component having an inner surface defining an interior, an exterior surface and an opening therebetween, the contact assembly comprising:
a terminal contact extending through the opening in the electronic component, the terminal contact having inner end within the interior of the electrical component and an outer end;
a deformable seal positioned about the terminal contact within the opening through the electronic component;
an outer insulator positioned adjacent the exterior surface of the electronic component, the outer insulator having a generally conical recessed surface extending about the terminal contact;
an inner insulator extending about the terminal contact, the inner insulator including a base portion and a neck portion extending into the opening; and
a torque generating structure for generating a deforming force on the seal such that the seal engages the recessed surface of the outer insulator and seals the opening through the electronic component.
13. The assembly of claim 12 wherein the terminal contact includes a radially extending disc projecting therefrom.
14. The assembly of claim 13 wherein the torque generating structure includes a nut threadable on the inner end of the terminal contact for compressing the inner and outer insulators between the disc and the nut.
15. The assembly of claim 12 wherein the inner insulator is formed from a high friction resistance material.