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Multiple Signal Parallel Frequency Spectrum Analyzer

IP.com Disclosure Number: IPCOM000093382D
Original Publication Date: 1967-Sep-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 67K

Publishing Venue

IBM

Related People

Rogers, LS: AUTHOR

Abstract

This frequency spectrum analyzer operates simultaneously on a number of nonrelated signals. This system utilizes a single set of filters for a plural number of signals which are required to be analyzed simultaneously White noise generator 1 provides noise across the entire frequency spectrum which is to be analyzed. The noise is applied in parallel to each bandpass filter in the filter bank utilized. The output of each filter is applied to a plurality of balanced modulators 3. The number of balanced modulators utilized is determined by the number of input signals which are to be analyzed simultaneously and the number of passbands provided in the filter bank.

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Multiple Signal Parallel Frequency Spectrum Analyzer

This frequency spectrum analyzer operates simultaneously on a number of nonrelated signals. This system utilizes a single set of filters for a plural number of signals which are required to be analyzed simultaneously White noise generator 1 provides noise across the entire frequency spectrum which is to be analyzed. The noise is applied in parallel to each bandpass filter in the filter bank utilized. The output of each filter is applied to a plurality of balanced modulators
3. The number of balanced modulators utilized is determined by the number of input signals which are to be analyzed simultaneously and the number of passbands provided in the filter bank.

With regard to a single channel of the spectrum analyzer, each channel provided for each signal to be analyzed is identical. Also, each balanced modulator connected to each bandpass filter is identical. The signal to be analyzed is applied to each balanced modulator. If the signal being analyzed contains frequency components within the bandpass of a given filter, the related balanced modulator produces an output consisting of a noise signal in the low- frequency range.

The output of each balanced modulator is amplified in a low-pass amplifier 5 and detected in a detector 6. An output from a detector 6 indicates that the signal being analyzed contains frequency components in the bandpass of the related filter. The circuit arrangement can be utilized in voice...