Transmitter with buzzer

In a radio transmitter-receiver garage door opener system including:

• a radio receiver responsive to reception of a preselected radio signal for moving a garage door between its opened and closed positions;
• a portable hand-held transmitter manually actuable for causing said receiver to move said door by radio transmission of said preselected radio signal, said transmitter incorporating
• a radio frequency oscillator for transmitting a radio signal to said receiver;
• modulating means manually actuable to electrically energize said radio frequency oscillator to transmit said radio frequency signal;
• and
• the improvement comprising an audio means connected in parallel with said radio frequency oscillator and responsive to actuation of said manually actuable modulating means for simultaneously producing a corresponding audio signal audible to a person holding said portable transmitter.

In a radio transmitter-receiver garage door opener system, including a radio receiver responsive to reception of preselected radio signals for moving a garage door between its opened and closed position;

• a transmitter actuable for causing said receiver to move said door by radio transmission of said preselected radio signal, said transmitter incorporating
• a radio frequency oscillator for transmitting a radio signal to said receiver;
• modulating means connected to the input of said radio frequency oscillator and actuable to electrically energize said radio frequency oscillator to transmit said radio signal;
• and
• the improvement comprising an audible sound producing means responsive to actuation of said radio frequency oscillator by said modulator means for simultaneously producing a corresponding audio signal audible to a person holding said portable transmitter;
• and
• means connecting in parallel the respective inputs of said radio frequency oscillator and audible sound producing means to the output of said modulating means, the radio signal output of said radio frequency oscillator being independent of said audible sound producing means.

In a digitally coded transmitter-receiver garage door opener system including:

• a radio receiver means responsive to radio reception of a preselected digital code for moving a garage door between its opened and closed positions;
• a portable hand-held transmitter manually actuable for causing said receiver means to move said door, by radio transmission of said preselected digital code, said transmitter incorporating
• means for generating a pulse train having a preselected number of pulses;
• a plurality of code switches connected to corresponding inputs of said pulse train generating means, said switches being manually positionable to control the width of corresponding pulses in said train so as to digitally encode said pulse train by changing the normal width of selected pulses therein;
• a radio frequency oscillator for transmitting a radio signal to said receiver and connected to said pulse train generating means for modulation by the digitally coded pulse train produced thereby;
• an electric supply manually actuable to energize said radio frequency oscillator and pulse generating means to transmit a radio frequency signal modulated by said digitally coded pulse train, said pulse train generating means being an integrated circuit unit comprising a resettable counter and an audio oscillator for stepping said counter through a number of steps equal to the number of pulses in said coded pulse train, said electric supply comprising a battery with one side connected to circuit ground and the other connected through a manually closable switch to a circuit voltage supply line having branches through said radio frequency oscillator and pulse train generating means and code switches all of which are also connected to circuit ground, said pulse train being applied from said pulse train generating means to said radio frequency oscillator through a conductor;
• and
• the improvement comprising a human perceptible alarm means connected in parallel with said radio frequency oscillator to the output of said pulse generating means and responsive to application of said pulse train by said pulse generator to said radio frequency oscillator for simultaneously producing a corresponding alarm output perceptible by a person holding said portable transmitter,
• said radio frequency oscillator and human perceptible alarm means having their respective input terminals connected in parallel to said pulse generating means for simultaneously receiving the same pulse train and thereby for simultaneously, through two entirely different forms of energy transmission, providing said same pulse train respectively for perception exclusively by said radio receiver means and exclusively by said person holding said portable transmitter, said human perceptible alarm means being incapable of causing said moving of said garage door, said human perceptible alarm means being a piezoelectric buzzer which reproduces said pulse train as an audio wave form corresponding thereto which and is audible to a person holding said portable transmitter, said buzzer being connected from said conductor to circuit ground, said transmitter being of the type which may be carried in the user's automobile to enable the user to open his or her garage door without leaving said automobile, the frequency of the pulse train applied to said buzzer being about 200 Hz for causing said buzzer to produce an audible tone signal pulsed at said pulse frequency of about 200 Hz for as long as said radio signal is being modulated by said pulse train, such that said user is subjected to an audible sound distinctively different from and additional to other normal sounds likely to be heard in an automobile and such that unintended operation of said transmitter can be sensed by a person in the automobile even with said transmitter located out of hand and sight.