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MICROPHONE DETECTION SYSTEM

IP.com Disclosure Number: IPCOM000240425D
Publication Date: 2015-Jan-29
Document File: 5 page(s) / 543K

Publishing Venue

The IP.com Prior Art Database

Abstract

An RC circuit (including at least a resistor and a microphone diaphragm having a capacitance) and a comparator can be used to detect a puff on an E-cigarette. By using a simple RC circuit and a comparator, the power consumption used in detecting a puff can be lower than the power consumption of some conventional circuits, e.g., as low as 1 uA.

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microphone detection system

Background

Detecting electrical signals from a microphone can be useful in various applications.  On example application is a puff detector in an electronic cigarette (E-cigarette).  A user causes a puff by sucking air through the E-cigarette with the user’s mouth.  Conventional technology for puff detection typically consumes a relatively large amount of power, which can be a disadvantage in E-cigarettes that generally rely on battery power.  

keywords

Microphone detection, puff detection, E-cigarette, RC circuit, comparator, microphone diaphragm. 

Summary

An RC circuit (including at least a resistor and a microphone diaphragm having a capacitance) and a comparator can be used to detect a puff on an E-cigarette.  By using a simple RC circuit and a comparator, the power consumption used in detecting a puff can be lower than the power consumption of some conventional circuits, e.g., as low as 1 uA.

Description

Figure 1 illustrates an example comparator by showing a functional diagram of the comparator on the left and a pin configuration on the right.

Figure 1: Comparator

The comparator can be, e.g., an Analog Devices ADCMP609BRMZ Comparator or any appropriate comparator.  Table 1 shows the pin function descriptions of the ADCMP609 comparator.

Table 1: Pin Function Descriptions

The comparator can be mounted onto a PC board, e.g., a Capital Advanced Technology Proto Board.  Figure 2 illustrates an example board with a comparator mounted on the board.

Figure 2: Comparator Integrated Circuit Mounted to PC Board

The comparator pins can be connected to an RC circuit including at least a resistor and a microphone diaphragm having an intrinsic capacitance.  Figure 3 illustrates the pins of the example comparator mapped to pins of the proto board with descriptions.

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