Remote control signal receiver and remote control signal receiving method
A remote control signal receiver receives a remote control signal in which bit signals are included as pulse signals. The remote control signal receiver includes a remote control signal receiving portion that receives a remote control signal, and a microcomputer. The microcomputer detects a change in a logic level of pulsed signals in the remote control signal, detects a pulse period and a pulse width of the pulse signals of the remote control signal, and determines whether there is an error in the remote control signal based on the detected pulse period and the pulse width of the pulse signals of the remote control signal. It is possible to detect an error in a remote control signal received by the remote control signal receiver.
1. A remote control signal receiver comprising:
a remote control signal receiving portion configured to receive a remote control signal in which bit signals are included as pulse signals; and
a microcomputer operatively coupled to the remote control signal receiving portion and configured to detect a change in a logic level of the pulse signals in the remote control signal, detect a pulse period and a pulse width of the pulse signals of the remote control signal, and determine from at least one of the pulse signals that were received in the remote control signal whether one of the pulse signals of the remote control signal is lost in the remote control signal by determining whether the pulse period of the at least one of the pulse signals that were received in the remote control signal is one of predetermined pulse periods and by determining whether the pulse width of the at least one of the pulse signals that were received in the remote control signal is one of predetermined pulse widths.
2. The remote control signal receiver according to claim 1 , wherein
the predetermined pulse widths are determined for each of the predetermined pulse periods.
3. The remote control signal receiver according to claim 1 , wherein
the microcomputer is configured to interpret the remote control signal as a bit signal based on the pulse period of the pulse signals of the remote control signal.
4. The remote control signal receiver according to claim 3 , wherein
the microcomputer is configured to interpret the remote control signal as a bit signal based also on the pulse width of the pulse signals of the remote control signal.
5. A remote control signal receiver comprising:
a remote control signal receiving portion configured to receive a remote control signal in which bit signals are included as pulse signals; and
a microcomputer operatively coupled to the remote control signal receiving portion and configured to detect a change in a logic level of the pulse signals in the remote control signal, detect a pulse period and a pulse width of at least one of the pulse signals that were received in the remote control signal, and determine whether there is an error in the remote control signal based on the pulse period and the pulse width of the at least one of the pulse signals that were received in the remote control signal,
the microcomputer being further configured to set and reset a flag indicating whether or not a change in the logic level of the pulse signals is due to a falling pulse signal, and determine whether there is an error in the remote control signal when the flag is not set.
6. The remote control signal receiver according to claim 5 , wherein
the microcomputer is configured to determine whether there is an error in the remote control signal when the flag indicates that the logic level of the pulse signals is due to a falling pulse signal.
7. A remote control signal receiver comprising:
remote control signal receiving means for receiving a remote control signal in which bit signals are included as pulse signals;
logic level detection means for detecting a change in the logic level of the pulse signals of the remote control signal;
pulse period detection means for detecting a pulse period of the pulse signals of the remote control signal;
pulse width detection means for detecting a pulse width of the pulse signals of the remote control signal;
error determining means for determining from at least one of the pulse signals that were received in the remote control signal whether one of the pulse signals of the remote control signal is lost in the remote control signal by determining whether the pulse period of the at least one of the pulse signals that were received in the remote control signal is one of predetermined pulse periods and by determining whether the pulse width of the at least one of the pulse signals that were received in the remote control signal is one of predetermined pulse widths; and
bit interpreting means for determining the remote control signal as a bit signal based on the detected pulse period.
8. A remote control signal receiver comprising:
remote control signal receiving means for receiving a remote control signal in which bit signals are included as pulse signals;
logic level detection means for detecting a change in the logic level of the pulse signals of the remote control signal;
pulse period detection means for detecting a pulse period of at least one of the pulse signals that were received in the remote control signal;
pulse width detection means for detecting a pulse width of the at least one of the pulse signals that were received in the remote control signal;
error determining means for determining whether there is an error in the remote control signal based on a combination of the pulse period and the pulse width of the at least one of the pulse signals that were received in the remote control signal;
bit interpreting means for determining the remote control signal as a bit signal based on the pulse period of the at least one of the pulse signals that were received in the remote control signal; and
flag setting means for setting and resetting a flag indicating whether or not a change in the logic level of the pulse signals is due to a falling pulse signal;
the error determining means determining whether there is an error in the remote control signal when the logic level detection means detects a change in the logic level of the pulse signals of the remote control signal and the flag is not set.
9. A remote control signal receiving method comprising:
receiving a remote control signal in which bit signals are included as pulse signals;
detecting a change in a logic level of the pulse signals of the remote control signal;
determining whether or not the change in the logic level of the pulse signals is due to a falling pulse signal;
detecting a pulse period and a pulse width of the pulse signals of the remote control signal;
determining from at least one of the pulse signals that were received in the remote control signal whether one of the pulse signals of the remote control signal is lost in the remote control signal by determining whether the pulse period of the at least one of the pulse signals that were received in the remote control signal is one of predetermined pulse periods and by determining whether the pulse width of the at least one of the pulse signals that were received in the remote control signal is one of predetermined pulse widths when the change in the logic level is due to predetermined either one of a falling pulse signal and a rising pulse signal; and
interpreting the remote control signal as a bit signal if there is no error in the remote control signal.