Method of and remote control apparatus for remotely controlling a medical appliance
First Claim
1. A method for remotely controlling a medical appliance by means of a transmitter and receiver comprising the steps of:
- assigning a number of first frequency signals of differing frequencies corresponding to the number of functions of the appliance to be controlled to a transmitter for selectively generating each of said number of first frequency signals as command frequency signal impulses and to a receiver, assigned to at least one such appliance to be controlled, for receiving said command frequency signal impulses;
defining a second frequency signal to designate a selected appliance to be controlled to a transmitter for selectively generating said second frequency signal as group frequency signal impulses and to a receiver assigned to at least said selected appliance to be controlled, for receiving said group frequency signal impulses;
transmitting group frequency signal impulses and selected command frequency signal impulses in an alternating sequence in response to a function chosen to be controlled for a selected appliance, said selected command frequency impulses corresponding to one of said number of first frequency signals of said differing frequencies for said function chosen;
receiving said group frequency signal impulses and said selected command frequency signal impulses;
selectively amplifying said received group frequency signal impulses and said selected command frequency signal impulses to apply at least 3 db more gain to said selected command frequency signal impulses than to said received group frequency signal impulses;
decoding said received group frequency signal impulses and generating indicator pulses enabling access to said selected appliance to be controlled if said selected appliance is assigned to said receiver;
decoding said received, selected command frequency signal impulses and applying a signal representing said function chosen to an enabled, selected appliance to be controlled to perform said function chosen; and
inhibiting a generation of indicator pulses whenever group frequency signal impulses defining more than one selected appliance are simultaneously received and have the same magnitude.
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Abstract
In a method of remotely controlling a medical appliance frequency signal impulses and group frequency impulses are transmitted alternately from a transmitter to a receiver.
In order to improve freedom from interference, the group frequency impulses are amplified in the transmitter and/or receiver by at least 3 dB less than the frequency signal impulses corresponding to command signals.
For the same purpose, in a remote control arrangement for performing the method, the amplifier provided in the receiver exhibits at the group frequency a gain factor lower by at least 3 dB than at the frequencies of the frequency signal impulses.
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Citations
18 Claims
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1. A method for remotely controlling a medical appliance by means of a transmitter and receiver comprising the steps of:
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assigning a number of first frequency signals of differing frequencies corresponding to the number of functions of the appliance to be controlled to a transmitter for selectively generating each of said number of first frequency signals as command frequency signal impulses and to a receiver, assigned to at least one such appliance to be controlled, for receiving said command frequency signal impulses; defining a second frequency signal to designate a selected appliance to be controlled to a transmitter for selectively generating said second frequency signal as group frequency signal impulses and to a receiver assigned to at least said selected appliance to be controlled, for receiving said group frequency signal impulses; transmitting group frequency signal impulses and selected command frequency signal impulses in an alternating sequence in response to a function chosen to be controlled for a selected appliance, said selected command frequency impulses corresponding to one of said number of first frequency signals of said differing frequencies for said function chosen; receiving said group frequency signal impulses and said selected command frequency signal impulses; selectively amplifying said received group frequency signal impulses and said selected command frequency signal impulses to apply at least 3 db more gain to said selected command frequency signal impulses than to said received group frequency signal impulses; decoding said received group frequency signal impulses and generating indicator pulses enabling access to said selected appliance to be controlled if said selected appliance is assigned to said receiver; decoding said received, selected command frequency signal impulses and applying a signal representing said function chosen to an enabled, selected appliance to be controlled to perform said function chosen; and inhibiting a generation of indicator pulses whenever group frequency signal impulses defining more than one selected appliance are simultaneously received and have the same magnitude. - View Dependent Claims (2, 3, 4)
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5. A method for remotely controlling an appliance by means of a transmitter and receiver comprising the steps of:
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transmitting a signal composed of at least first and second frequencies in an alternating sequence, said first frequency defining a function to be performed by said appliance and said second frequency uniquely defining an appliance to be controlled; receiving said signal composed of at least first and second frequencies in an alternating sequence; selectively amplifying said received first and second frequencies to first and second levels, respectively, said first level being at least 3 db higher than said second level; enabling an appliance uniquely defined by said second frequency; and applying a signal corresponding to the function to be performed as defined by said first frequency to said enabled appliance.
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- 6. A remote control arrangement for controlling a medical appliance, comprising a transmitter, a receiver associated with at least one appliance, said transmitter comprising a generator for generating frequency signals of different frequencies as a function of a command signal, said transmitter having means for generating a command signal as a sequence of frequency signal impulses and for the generation alternately therewith of group frequency impulses of group frequencies different from all the frequency signals corresponding to command signals which can be generated, said receiver having at its input an amplifier selective for the frequencies of the frequency signal impulses corresponding to the command signals and of the group frequency impulses and a decoding circuit following said amplifier which, when supplied with frequency signal impulses emits command signal impulses to an output corresponding to the number of the frequency signals which can be generated, said amplifier further operating when fed by the group frequency impulses to emit indicator impulses indicating the reception of said group frequency impulses to a further output and which when fed simultaneously with two signals of different frequency and approximately equal amplitude generates no output signals, and said receiver having means to emit the command signal corresponding to the respective command signal impulses as a function of the presence of the indicator impulses, said amplifier of said receiver having at the group frequency a gain factor lower at least by 3 dB than at the frequencies of the frequency signal impulses corresponding to command signals.
Specification