Method and apparatus for modulating signals
US6151366A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 17, 1998 |
| Grant date | Nov 21, 2000 |
| Priority date | — |
| Expiry date | Apr 17, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L27/2017
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A signal modulator includes a digital signal processor, an address buffer, a counter, and a first memory device. The digital signal processor is adapted to receive digital data at a receive sampling rate and define a code word based on a subset of the digital data. The address buffer is coupled to the digital signal processor and adapted to receive the code word and store a base address. The counter is adapted to increment an address offset at a transmit sampling rate. The transmit sampling rate is a multiple of the receive sampling rate. The first memory device has a plurality of memory locations and is adapted to receive the base address and the address offset and provide a first waveform data sample from the memory location addressed by the base address and the address offset. A method for modulating a signal includes receiving digital data at a receive sampling rate. The time interval between digital data samples defines a bit interval. A code word is determined based on a subset of the digital data. A counter is initialized at the start of the bit interval. The counter is incremented at a transmit sampling rate. An address is determined based on the code word and an address of…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.