Classifications

• • G—PHYSICS
  • G08—SIGNALLING
  • G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
  • G08C23/00—Non-electrical signal transmission systems, e.g. optical systems
  • G08C23/04—Non-electrical signal transmission systems, e.g. optical systems using light waves, e.g. infrared

Definitions

• the present invention relates to an electronic device wherein the power consumption of its infrared receiver on stand-by is reduced.
• the infrared receiver provides the signals transmitted by means of the remote control of the electronic device to be received by the electronic device.
• the infrared receiver is required to operate also on stand-by.
• the most used approach for reducing the power consumption on stand-by is that the infrared receiver of the device is kept operating under the control of a processor, and all other units are completely turned off. In this situation, reducing the amount of power consumed by the infrared receivers becomes critical.
• a way of reducing the average power consumed by the infrared receivers is to supply the infrared receiver not constantly but periodically by the pulse-width modulation (PWM) - technique.
• PWM pulse-width modulation
• the infrared receiver first detects the presence of a signal. After the signal is detected, the infrared receiver is completely activated. The completely activated infrared receiver decodes the next command received in the signal. If the decoded command is a command that provides the electronic device to leave the stand-by mode, the electronic device leaves the stand-by mode.
• the waiting period between the sequential activation moments of the infrared receiver is configured depending on the period of the command transmitted by the transmitter when any button of the remote control is pressed.
• different remote control protocols which differ according to the modulation of the signal emitted by the transmitter, are used.
• the infrared transmitter starts transmitting the first command. This moment is called the moment to . From the moment t 0 onwards, throughout the period t a ', the infrared transmitter is activated. t a ' is the duration wherein the infrared transmitter is active in a period. The signal that is transmitted throughout the period t a ' is a command. Therefore, the period t a ' is called the "command period". After the period t a ', the infrared transmitter remains passive, that is, stands by throughout a fixed period of time described as t b '.
• the period t b ' is called the "stand-by period" of the infrared transmitter.
• the infrared transmitter is activated again for the period t a ' and retransmits the same command.
• a signal with a different modulation is generated, and the command and stand-by periods of the infrared transmitter differ according to the protocol.
• the infrared receiver is momentarily activated at certain intervals.
• the stand-by period between the sequential moments, in which the infrared receiver is activated, is represented by t c ( Figure 2).
• the period t c in the state of the art is determined according to the principle of detecting definitely the first command of the commands transmitted by the infrared transmitter throughout the period of time wherein the user presses the button of the remote control. Therefore, the stand-by period (t c ) between two sequential activations of the infrared receiver is adjusted such that it will be shorter than the command period (t a ') of the infrared transmitter (t c ⁇ t a ').
• each of the activating series (c, d) which are different from each other according to the moment the button is pressed, of the infrared receiver detects definitely the first command of the commands transmitted by the infrared transmitter (the moment A').
• the infrared receiver is completely activated and the next command is decoded (H') ( Figure 2). If the command is a command that provides the electronic device to leave the stand-by mode, the electronic device leaves the stand-by mode.
• the aim of the present invention is the realization of an electronic device wherein the power consumption of its infrared receiver on stand-by is reduced.
• the electronic device realized in order to attain the aim of the present invention, explicated in the first claim and the respective claims thereof, is controlled by a remote control comprising an infrared transmitter and comprises an infrared receiver.
• the infrared transmitter of the remote control transmits the same command at least k times throughout the average period wherein a button of the remote control is pressed by the user.
• the stand-by period between two sequential activations of the infrared receiver is determined such that the infrared receiver will detect any and only one of the first k-1 commands out of k commands transmitted by the infrared transmitter throughout the average period wherein a button of the remote control is pressed by the user.
• Figure 2 - is the view of the commands which are transmitted by the infrared transmitter of the remote control throughout the pressing period of a button of the remote control and which repeat, and of different state-of-the-art activating series (c, c1) of the infrared receiver; all of which are illustrated on the time scale.
• Figure 3 - is the view of the activating series on the time scale wherein the first activation of the infrared receiver is before the moment the button is pressed (t 0 ), according to the present invention.
• Figure 4 - is the view of the activating series on the time scale wherein the first activation of the infrared receiver is after the moment the button is pressed (t 0 ), according to the present invention.
• the elements illustrated in the figures are numbered as follows:
• the electronic device (1) comprises an infrared receiver (2) and is controlled by a remote control (3).
• the remote control (3) comprises an infrared transmitter (4) and buttons (5).
• t d Stand-by period between two sequential activations of the infrared receiver (2) on stand-by
• d, dl Activating moments of the infrared receiver (2) activating series which are different from each other and independent of each other, according to the present invention
• k Number of transmissions of the same command by the infrared transmitter (4) throughout the average period wherein a button (5) of the remote control (3) is pressed by the user
• rij j ⁇ s i'th, j'th, ... s'th non-sequential activation of the infrared receiver (2)
• the stand-by period (t d ) between two sequential activations of the infrared receiver (2) on stand-by is adjusted by the device producer according to the used remote control (3) protocol.
• the period wherein a button (5) of the remote control (3) is pressed has an average of 300 milliseconds.
• the infrared transmitter (4) of the remote control (3) transmits the command, which makes the electronic device (1) leave the stand-by mode, at least k times throughout the average period wherein a button (5) is pressed.
• the stand-by period (t d ) between two sequential activations of the infrared receiver (2) of the electronic device (1) is determined as the greatest of the values t d providing the condition ⁇ t 0 ⁇ t d * n, ⁇ t o + t a or t o + t a + t b ⁇ t d * n j ⁇ t o +2 * t a+ t b or ... to+ (k-2) * t a + (k-2) * t b ⁇ t d * n s ⁇ t o + (k-1) * t a + (k-2) * t b ⁇ , while n, ⁇ n,
• the infrared receiver (2) detects any and only one of the first k-1 commands out of k commands which are transmitted by the infrared transmitter (4) throughout the average period wherein a button (5) is pressed, and which make the electronic device (1) leave the stand-by mode. After the detection is realized, the infrared receiver (2) is completely activated and by receiving all of the command that is after the command wherein the detection is realized, the command is decoded, and the electronic device (1) leaves the stand-by mode.
• the stand-by period (t d ) between two sequential activations of the infrared receiver (2) is increased such that it will be longer than the command period (t a ) and shorter than the stand-by period (t b ), and the power consumption of the infrared receiver (2), hence of the electronic device (1) on stand-by is reduced.
• the infrared transmitter (4) transmits the command, which makes the electronic device (1) leave the stand-by mode, at least three times throughout the average period wherein a button (5) of the remote control (3) is pressed
• the infrared receiver (2) detects any and only one of the first two transmitted commands.
• the infrared receiver (2) is required to actively detect the first command, which starts to be transmitted at any moment t 0 , or the second command, which starts to be transmitted at the moment to+ t a + t b , in the time intervals with period t d . In this situation;
• the stand-by period (t d ) between two sequential activations of the infrared receiver (2) is determined as the greatest of the values t d providing the condition
• the stand-by period (t d ) between two sequential activations of the infrared receiver (2) is determined as the greatest of the values t d providing the condition ⁇ t 0 ⁇ t d * n, ⁇ t o + t a veya t o + t a + t b ⁇ t d * n, ⁇ t o +2 * t a + t b ⁇
• the possible activating series (d, d1) of the infrared receiver (2) which are different from each other according to the moment (to) wherein the button (5) is pressed detect only the first or only the second command of the first two commands (A) ( Figure 3 and Figure 4).
• the infrared receiver (2) is completely activated and the command (H) that is after the command wherein the detection (A) is realized is decoded by being completely received, and the electronic device (1) leaves the stand-by mode.
• RC5 is used as the remote control (3) communication protocol.
• the period (t a ) for the infrared transmitter (4) to transmit a command is 24,9 milliseconds which correspond to data of 14 bits
• the stand-by period ( t b ) of the infrared transmitter (4) is 88,9 milliseconds which correspond to data of 50 bits.
• the infrared transmitter (4) transmits the command, which makes the electronic device (1) leave the stand-by mode, at least 3 times.
• the stand-by period (t d ) between two sequential activations of the infrared receiver (2) is determined as the greatest, being 46.228 milliseconds (26 bits), of the values t d providing the condition [0037] ⁇ to ⁇ t d * n, ⁇ t o + 24,9 or t o + 113,8 ⁇ td * ri j ⁇ t o + 138,7 ⁇ .
• the greatest possible value of the stand-by period (t c ) between two sequential activations of the infrared receiver (2) is 23,114 milliseconds (13 bits).
• the electronic device (1) of the present invention provides twice more power saving in RC5 protocol in comparison with the state of the art.
• the value t d hence the provided saving can be increased to the extent of the extension of the period wherein the button (5) of the remote control (3) is pressed in order to make the electronic device (1) leave the stand-by mode.
• the stand-by period (t d ) between two sequential activations of the infrared receiver (2) is determined under the same condition again.

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• Physics & Mathematics (AREA)
• General Physics & Mathematics (AREA)
• Selective Calling Equipment (AREA)
• Optical Communication System (AREA)

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Cited By (3)

Citations (4)

• 2009
  • 2009-12-16 EP EP09802130A patent/EP2370962A1/de not_active Withdrawn
  • 2009-12-16 WO PCT/EP2009/067292 patent/WO2010076220A1/en active Application Filing

Patent Citations (4)

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