Periodic signal enhancement system

#1. Technical Field

#This invention relates to signal processing systems, and more particularly to a system that may enhance periodic signal components.

#2. Related Art

#The invention can be better understood with reference to the following drawings and description. The components in the figures are not necessarily to scale, emphasis instead being placed upon illustrating the principles of the invention. Moreover, in the figures, like referenced numerals designate corresponding parts throughout the different views.

#FIG. 1 is a signal enhancement system with preprocessing and post processing logic.

#FIG. 2 is a single stage signal enhancement system.

#The enhancement system detects and tracks one or more fundamental frequency components in a signal. The signal enhancement system reinforces the tracked frequency components. The enhancement system may improve the intelligibility of information in a speech signal or other audio signals. The reinforced signal may have an improved signal-to-noise ratio (SNR).

#In FIG. 1, a signal enhancement system 100 may operate in conjunction with preprocessing logic 102 and post-processing logic 104. The enhancement system 100 may be implemented in hardware and/or software. The enhancement system 100 may include a digital signal processor (DSP). The DSP may execute instructions that delay an input signal, track frequency components of a signal, filter a signal and/or reinforce spectral content in a signal. Alternatively, the enhancement system 100 may include discrete logic or circuitry, a mix of discrete logic and a processor, or may be distributed over multiple processors or programs.

#The enhancement system 100 may accept input from the input sources 106. The input sources 106 may include digital signal sources or analog signal sources such as a microphone 108. The microphone 108 may be connected to the enhancement system 100 through a sampling system 110. The sampling system 110 may convert analog signals sensed by the microphone 108 into digital form at a selected sampling rate.