The major difference is that, a DSP is a chip which can be programmed based on our requirement, whereas an FPGA can be programmed to design a chip for our own purpose. FPGA can also be reprogrammed based on the changes in our application.

DSP Group was created in 1987.

SPIRIT DSP was created in 1992.

The population of DSP Group is 2,009.

A DSP (digital signal processing) chip could be used for this. But, the solution would be more than one electronic device.

The circuit would be similar to:

microphone (input) -> DSP microprocessor (pattern detection) -> visual output (LCD screen)