Buffered waveforms for high speed digital to analog conversion

• US 20060080722A1
• Filed: 07/21/2005
• Published: 04/13/2006
• Est. Priority Date: 10/12/2004
• Status: Abandoned Application

• Current Assignee: Intellectual Ventures Holding 73 LLC (Intellectual Ventures LLC)
• Original Assignee: Intellectual Ventures Holding 73 LLC (Intellectual Ventures LLC)
• Inventors: Santhoff, John
• Application Number:
  US11/188,231
• Publication Number:
  US 20060080722A1
• Time in Patent Office: Days
• US Class Current: 725/116
• CPC Class Codes: H04L 25/03834 using pulse shaping
• CPC Class Codes: H04L 27/365 Modulation using digital generation of the modulated carrier (not including modulation of a digitally generated carrier)
• CPC Class Codes: H04N 7/10 Adaptations for transmission by electrical cable H04N7/12 takes precedence
• CPC Class Codes: H04N 7/22 Adaptations for optical transmission

Abstract

Apparatus'"'"' and methods of supplying digital data to a digital-to-analog coverter (DAC) without using a conventional digital signal processor are provided. The present invention may provide pre-digitized communication waveforms to a DAC according to any desired communication requirement. This Abstract is provided for the sole purpose of complying with the Abstract requirement rules that allow a reader to quickly ascertain the subject matter of the disclosure contained herein. This Abstract is submitted with the explicit understanding that it will not be used to interpret or to limit the scope or the meaning of the claims.

Claims

1. A buffer apparatus, comprising:

a signal input structured to receive a communication signal;

a data symbol library communicating with the signal input, the data symbol library structured to match the communication signal with a stored data symbol;

a first radio frequency waveform library communicating with the data symbol library, the first radio frequency waveform library structured to match the stored data symbol with a stored digital radio frequency waveform;

a digital to analog converter (DAC), communicating with the first radio frequency waveform library, the DAC structured to convert the digital radio frequency waveform to an analog signal.

2. The apparatus of claim 1, further comprising:

a second radio frequency waveform library communicating with the data symbol library, the second radio frequency waveform library structured to match the stored data symbol with a stored digital radio frequency waveform.

3. The apparatus of claim 1, wherein the first radio frequency waveform library comprises a list containing a plurality of radio frequency waveforms that correspond to a first data modulation method.

4. The apparatus of claim 2, wherein the second radio frequency waveform library comprises a list containing a plurality of radio frequency waveforms that correspond to a second data modulation method.

5. The apparatus of claim 1, wherein the step of converting the digital radio frequency waveform into an analog radio frequency waveform employs a digital to analog converter that can sample the digital radio frequency waveform at at least twice the inverse of a highest frequency component of the digital radio frequency waveform.

6. The apparatus of claim 1, where the communication signal is selected from a group consisting of:

a video signal, an audio signal, an Internet-formatted signal, an Ethernet-formatted signal, an NTSC-formatted signal, an MPEG-formatted signal, and a JPEG-formatted signal.

7. The apparatus of claim 1, where the data symbol library comprises a list containing a plurality of symbols.

8. The apparatus of claim 1, where the first radio frequency waveform library comprises a list containing a plurality of radio frequency waveforms.

9. A method of supplying data to a digital to analog converter (DAC), the method comprising the steps of:

providing a data symbol;

matching the data symbol with a stored data symbol;

matching the stored data symbol with a digital radio frequency waveform; and

passing the digital radio frequency waveform to the DAC.

10. The method of claim 9, further comprising the step of:

converting the digital radio frequency waveform into an analog radio frequency waveform.

11. The method of claim 10, wherein the step of converting the digital radio frequency waveform into an analog radio frequency waveform comprises:

sampling the digital radio frequency waveform at at least twice the inverse of a highest frequency component of the digital radio frequency waveform.

12. The method of claim 10, wherein the step of matching the data symbol with a stored data symbol comprises obtaining a data symbol from a data symbol memory.

13. The method of claim 10, wherein the step of matching the stored data symbol with a digital radio frequency waveform comprises obtaining a digital radio frequency waveform from a digital radio frequency waveform memory.

18. The method of claim 10, wherein the means for matching the stored data symbol with a digital radio frequency waveform comprises obtaining a digital radio frequency waveform from a digital radio frequency waveform memory.

14. A method of supplying data to a digital to analog converter (DAC), comprising:

means for providing a data symbol;

means for matching the data symbol with a stored data symbol;

means for matching the stored data symbol with a digital radio frequency waveform; and

means for passing the digital radio frequency waveform to the DAC.

15. The method of claim 14, further comprising:

means for converting the digital radio frequency waveform into an analog radio frequency waveform.

16. The method of claim 15, wherein the means for converting the digital radio frequency waveform into an analog radio frequency waveform comprises:

means for sampling the digital radio frequency waveform at at least twice the inverse of a highest frequency component of the digital radio frequency waveform.

17. The method of claim 14, wherein the means for matching the data symbol with a stored data symbol comprises obtaining a data symbol from a data symbol memory.