Image processing apparatus, method for controlling the same, and storage medium
AssigneeCanon Kabushiki Kaisha
InventorYosui Naito
Life of this patent
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Abstract
An image processing apparatus that covers standards of a dial tone for a plurality of countries with a relatively small number of pattern tables and reduces the number of times that a sound is misdetected as a dial tone, a method for controlling the same and a program are provided. To accomplish this, the image processing apparatus measures a length of a tone signal received from outside; determines whether an intermittent dial tone including the measured tone signal and a previously received tone signal has a specific pattern or not; and determines whether a duty cycle of the intermittent dial tone is a duty cycle within a given range or not, thereby determining whether the dial tone is valid or not.
Claims9
An image processing apparatus comprising:
- a signal determination unit that determines whether a received signal received from outside is a tone signal;
- a measurement unit that measures a length of the tone signal, if the signal determination unit determines that the received signal is a tone signal;
- a pattern determination unit that determines whether an intermittent dial tone has a specific pattern or not, the intermittent dial tone including the tone signal whose length is measured by the measurement unit and a previously received tone signal;
- a duty cycle determination unit that determines whether a duty cycle of the intermittent dial tone is a duty cycle within a given range, if the pattern determination unit determines that the intermittent dial tone has the specific pattern;
- and
- a calling unit that performs calling in accordance with the intermittent dial tone, if the duty cycle determination unit determines that the duty cycle of the intermittent dial tone is a duty cycle within the given range.
A method for controlling an image processing apparatus comprising:
- determining, with a signal determination unit, whether a received signal received from outside is a tone signal;
- measuring, with a measurement unit, a length of the tone signal, if the received signal is determined in the signal determining step to be a tone signal;
- determining, with a pattern determination unit, whether an intermittent dial tone has a specific pattern, the intermittent dial tone including the tone signal whose length is measured in the measuring step and a previously received tone signal;
- determining, with a duty cycle determination unit, whether a duty cycle of the intermittent dial tone is a duty cycle within a given range, if the intermittent dial is determined in the pattern determining step to have the specific pattern;
- and
- calling in accordance with the intermittent dial tone with a calling unit, if the duty cycle of the intermittent dial tone is determined in the duty cycle determining step to be a duty cycle within the given range.
Dependencies are inferred from the claim text.