Transport apparatus
AssigneeSeiko Epson Corporation
InventorSeiji Takamatsu
Life of this patent
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Abstract
A transport apparatus includes a speaker and a mike disposed at respective positions between which a transport path of a medium is interposed, where the speaker and the mike face each other, a drive circuit that outputs a drive signal to the speaker, an amplifier circuit formed by coupling a plurality of amplifiers in series, where the amplifier circuit amplifies and outputs an output signal of the mike, a processor to which the output signal of the amplifier circuit is input, an attenuation circuit disposed in a stage preceding a predetermined amplifier, where the attenuation circuit attenuates an input signal and outputs the input signal to the predetermined amplifier, and a switch that switches an attenuation factor by the attenuation circuit.
Claims4
A transport apparatus comprising:
- a transport mechanism for transporting a medium along a predetermined transport path;
- a speaker and a mike disposed at respective positions between which the transport path is interposed, the speaker and the mike facing each other;
- a drive circuit that outputs a drive signal to the speaker;
- an amplifier circuit formed by coupling a plurality of amplifiers in series, the amplifier circuit amplifying and outputting an output signal of the mike;
- a processor to which the output signal of the amplifier circuit is input;
- an attenuation circuit disposed in a stage preceding a predetermined amplifier of the plurality of amplifiers, the attenuation circuit attenuating an input signal to output the attenuated input signal to the predetermined amplifier;
- and
- a switch that switches an attenuation factor by the attenuation circuit, wherein the processor causes the switch to switch the attenuation factor by the attenuation circuit to a first attenuation factor among the first attenuation factor and a second attenuation factor having a lower attenuation degree than the first attenuation factor in a state where the medium is not present between the speaker and the mike based on the output signal of the amplifier circuit,
- causes a voltage adjustment circuit to adjust a drive signal of the drive circuit, and
- after adjusting the drive signal, causes the switch to switch the attenuation factor by the attenuation circuit to the second attenuation factor to determine a state between the mike and the speaker based on the output signal of the amplifier circuit.
Dependencies are inferred from the claim text.