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Browse Prior Art Database

Analog To Binary Converter And Formant Tracker

IP.com Disclosure Number: IPCOM000096766D
Original Publication Date: 1963-Nov-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 39K

Publishing Venue

IBM

Related People

Nassimbene, EG: AUTHOR

Abstract

The circuit determines on a continual basis which of a plurality of analog signals has the highest voltage at each instant of time. It presents this information in binary form. This determination is useful in speech recognition systems to track the formants, i. e., determine on a continual basis which frequency has the most energy at each instant of time.

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Analog To Binary Converter And Formant Tracker

The circuit determines on a continual basis which of a plurality of analog signals has the highest voltage at each instant of time. It presents this information in binary form. This determination is useful in speech recognition systems to track the formants, i. e., determine on a continual basis which frequency has the most energy at each instant of time.

Speech signals are received at the input and presented to filters F1... F6. Each filter selects a particular frequency and provides an analog output voltage proportional to the instantaneous energy of that frequency within the input signal.

The remaining circuitry determines which filter is presenting the largest voltage and signifies the filter in binary code at the output. For example, if filter F is presenting the largest voltage, outputs 4 and 1 (4 + 1 = 5) are energized. Each transistor T, T and T is connected to receive a first plurality of analog signals at its base through an Or. The largest voltage into the Or appears at the base input to the transistor and a second plurality of analog signals, also in an Or configuration, at its emitter. The transistor then becomes a decision making element. It conducts when one of the first inputs reaches a higher voltage than any of the second inputs.

For example, in the T(1) stage, if input 1, 3 or 5 is greater than the higher input of 2, 4 or 6, transistor T is forwardly biased and conducts, indicating on output. On th...