Patent ID: 8718247
Filing Date: 2014-05-06
Classification: H04N

Abstract:
1. 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.