DSP Application on One Dimensional Signal

Patent Review: METHOD AND APPARATUS FOR FREQUENCY MODULATION SYNTHESIS

Application No.: 08/949,574

Patent No.: 6011448A

Date of patent: Jan. 4, 2000

Inventors: Daniel H. McCabe,Daniel H. McCabe,

Summary: The analysis of the Frequency Modulation involves multiplication and the feedback factor.Feedback factor can be implemented by using the bit-wise logical shift.This patent gives the excellent solution for large discrete increments involved in multiplication and also the sine look-up table hence the hardware required can be minimized. The invention provides a method of frequency modulation synthesis that can be carried out with shifts and additions,and without a large sine table.The sines are calculated using the coordinate rotation digital computer (CORDIC) algorithm. The use of this algorithm improves the efficiency.acquire sine values as opposed to an extensive sine look-up table. The method can be implemented with a programmed special purpose processor such as a digital signal processor. 
Link: http://www.google.co.in/patents/US6011448


IEEE Paper Review:A Pipelined CORDIC Architecture and Its Implementation in All-Digital                                      FM Modulator-Demodulator
Authors: Trio Adiono, Nur Ahmadi
Publisher :- IEEE
Published in: 6th Asia Symposium on Quality Electronic Design
Date of Conference: 4-5 Aug. 2015

Summary: — COordinate Rotation DIgital Computer (CORDIC), is an algorithm that is used to perform trigonometric-related calculations. CORDIC is often utilized in the absence of hardware multiplier since this algorithm requires only addition, subtraction, bit shifting, and lookup table.This paper provides an implementation of CORDIC algorithm using pipelined architecture.The proposed solution has greater clock speeds compared to other FM modulator techniques as seen from the comparison graph of paper.


Application 2:

 IEEE Paper Review:Implementation and Performance Analysis of Real-Time Digital Filter for Audio Signals
Authors: Pranab Kumar Dhar, Ui-Pil Chong, Jong-Myon Kim
Publisher :- IEEE
Published in: 2008 Third International Forum on Strategic Technologies

Summary: A real-time digital filter can perform filtering operation on real-time signals.In this paper effect of the window on FIR filter has been discussed. Real time audio processing allows modified audio to be “judged by hearing” while it is processed.The filter output using DSP block in MATLAB sets shows that smooth ripples appear in stop band but no ripples appear in pass band.The outputs of these filters are observed both by hearing the sound and analyzing the frequency response curves. Finally we analyzed the performance of these filters. The filters can be used to remove noise.Also for processing and transmitting of audio signal for specific purpose. 


Link: http://ieeexplore.ieee.org/document/4602912/

Patent Review: Hearing aid digital filter 
Application No.: US 09/324,128
Patent No.: US6292571 B1
Date of patent:18 Sep 2001
Inventors: Walter P. Sjursen


Summary: This patent mainly focuses on reducing the hardware required for digital filter with the use of single general purpose multiplier. It uses a DSP algorithm portion of a digital hearing aid by using signal processing algorithms that can be implemented in a minimum amount of dedicated circuitry. Circuitry is minimized in three Ways: First, only one general purpose multiplier is used to change the frequency response as a function of signal level, second, the filter coefficients are values represented by 2 raised to the nth power, and third, a non-recursive (finite impulse response) filter is used.Stability is ensured as FIR filters are used.


Link: https://www.google.ch/patents/US6292571