A digital detector with selectable passband
Abstract
Digital filters and detection techniques are used in many modern communication and control circuits. Such digital techniques are valued for ease of realization and implementation as well as for clean and precise logical outputs. A digital detector can be designed with standard logic family components capable of detecting the center frequency, F sub C, and bandpass, B, using standard Karnaugh mapping techniques. An internal oscillator at frequency F sub o, provides a counting sequence C, to an n- Bit counter which provides the basis for nonsymmetrical near ideal filter. The basis of the filter is implemented on an n-variable Karnaugh map with the center frequency selected as the middle cell in an odd cellular array and the bandpass selected as the width of this cellular combination. Because standard Karnaugh mapping is used, the design process and logic relation is simplified by using a two level logic.
- Publication:
-
NASA STI/Recon Technical Report N
- Pub Date:
- January 1977
- Bibcode:
- 1977STIN...7726409L
- Keywords:
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- Bandpass Filters;
- Digital Filters;
- Digital Techniques;
- High Pass Filters;
- Read-Only Memory Devices;
- Ttl Integrated Circuits;
- Electronics and Electrical Engineering