1. A circuit for controlling the operation of a cable television alarm device in accordance with an alert signal and an all-clear signal developed by subscriber apparatus in response to broadcast data received over the cable television network, comprising: bi-stable means having a first input responsive to the alert signal for assuming a first state for activating the alarm device and a second input responsive to the all-clear signal for assuming a second complementary state for de-activating the alarm device; and manually operable single-pole switch means coupled to the second input of the bi-stable means, said switch means being displaceable between a first position for coupling a first reference potential to the second input of the bi-stable means for enabling the bi-stable means to assume its first or second state in response to an alert or an all-clear signal respectively and a second position for coupling a second reference potential to the second input of the bi-stable means for causing the bi-stable means to assume and maintain its second state, said switch means being further operable for momentary displacement to its second position for coupling the second reference potential to the second input of the bi-stable means for causing the bi-stable means to assume its second state, whereby the switch means is manually displaceable between two switching positions for enabling, disabling and clearing the alarm device.