Abstract: A heating apparatus for an aerosol-forming article includes: a housing that accommodates at least a portion of the aerosol-forming article; a power circuit that delivers power to a heat-generating body for heating the aerosol-forming article; a controller that controls the power circuit to adjust the heating temperature of the aerosol-forming article; a temperature sensor that detects the temperature of the housing and outputs an analog signal corresponding to the detected temperature; and an oscillator that outputs the signal of the frequency corresponding to the magnitude of the analog signal output by the temperature sensor; wherein the controller detects a user's puff or adjusts the heating temperature of the aerosol-forming article based on the frequency of the signal output by the oscillator.

Abstract: An optical signal quality monitoring apparatus includes an optical detector for directly receiving an optical signal modulated in an optical path and converting the optical signal to an electric signal, an asynchronous sampling unit for asynchronously sampling the electric signal of the optical detector at a reduced speed, and a digital signal processor for monitoring an optical signal quality by finding a synchronized amplitude histogram of data sampled in the asynchronous sampling unit. An optical signal quality monitoring method includes (a) a step of allowing an optical detector to directly receive a modulated optical signal and to convert the optical signal to an electric signal; (b) a step of allowing an asynchronous sampling unit to asynchronously sample the electric signal; and (c) a step of allowing a digital signal processor to monitor an optical signal quality by generating a synchronized amplitude histogram of sampled data.

Abstract: An optical signal quality monitoring apparatus includes an optical detector for directly receiving an optical signal modulated in an optical path and converting the optical signal to an electric signal, an asynchronous sampling unit for asynchronously sampling the electric signal of the optical detector at a reduced speed, and a digital signal processor for monitoring an optical signal quality by finding a synchronized amplitude histogram of data sampled in the asynchronous sampling unit. An optical signal quality monitoring method includes (a) a step of allowing an optical detector to directly receive a modulated optical signal and to convert the optical signal to an electric signal; (b) a step of allowing an asynchronous sampling unit to asynchronously sample the electric signal; and (c) a step of allowing a digital signal processor to monitor an optical signal quality by generating a synchronized amplitude histogram of sampled data.