Attenuation method and attenuator for linear continuous adjustable sound intensity

Abstract

The invention discloses a logarithmic attenuation method and an attenuator for linear continuous adjustable signals. The attenuator comprises a timer circuit, an attenuation quantity control signal generating circuit, and an audio circuit, wherein the timer circuit is used for generating a first pulse and a second pulse; the attenuation quantity control signal generating circuit is used for generating a first signal, a second signal and a changing process signal positioned between the first signal and the second signal; and the audio circuit is used for performing a multiply operation. The logarithmic attenuation method and the attenuator can accurately quantify the decibel or the logarithmic scale attenuation quantity of the attenuator by performing linear adjustment on the resistance value of a variable resistor.

Description

technical field [0001] The invention relates to a logarithmic attenuation method and an attenuator of a signal, especially a sound intensity signal. Specifically, the invention relates to a logarithmic attenuation method of a linear continuously adjustable signal, especially a sound intensity signal, and an attenuator. Background technique [0002] In 1834, Weber discovered that the difference threshold of stimuli is a linear function of the intensity of the stimulus itself, which is called Weber's law; that is to say, animals reflect the world not by reflecting the absolute quantities of physical parameters in nature, but by reflecting their relative quantities , that is, the ratio of the variation to the reference absolute quantity. This law applies to each sensory system, so the psychophysical quantity of sensation reflects the logarithm of the ratio of the absolute quantity of the stimulus to the reference value. People's feelings (audition, sight, smell, taste, body se...

AI Technical Summary

Problems solved by technology

[0006] Traditional attenuators mainly include the following types: 1. Potentiometer attenuator, the attenuation amount of the attenuator is adjusted by adjusting the resistance of a variable resistor, which can be adjusted continuously, but it is difficult to quantitatively indicate by decibel or logarithmic scale The size of its attenuation; 2. Program-controlled attenuator, use the programming method to set the attenuation of the attenuator, which can be set in any way, but must be variable components to participate, and it is not conducive to the user's manual control; 3. Electronically adjustable attenuators use the variable resistance characteristics of PIN tubes to attenuate signals. Most of them are used in microwave frequency bands. It is easy to achieve impedance matching of attenuated signals. The disadvantage is that it is difficult to quantitatively indicate the amount of attenuation.

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