High capacity paging system employing subaudible tones

Claim 2

In a high capacity paging system including a transmitter for transmitting a modulated signal in response to a plurality of messages sent in sequence with each message including address signals and audio signals, and wherein each transmission is initiated by a switch being actuated, and the message terminated by deactuating the switch, the combination including; control means coupled to said switch and transmitter and operative in response to a first actuation of said switch to actuate said transmitter, said control means further including time delay means for holding said control means operative for a first predetermined time period after a first deactuation of said switch, address means for developing address signals coupled to said switch and transmitter and operative in response to said first actuation of said switch to develop said address signals in a first of said plurality of messages and couple said address signals to said transmitter for a second predetermined time period no greater than said first predetermined time period, audio delay means coupled to said control means and said transmitter, said audio delay means operative in response to said control means operation to receive said audio signals in said first message and delay said audio signals by a third predetermined time period greater than said second predetermined time period and no greater than said first predetermined time period and couple said delayed audio signals to said transmitter, said control means being further operative in response to a second actuation of said switch during said first predetermined time period after said first deactuation of said switch to maintain said transmitter and audio delay means operative and to reset said first delay means for holding said control means operative for another first predetermined time period after a second deactuation of said switch, said address means being operative in response to said second actuation of said switch to develop said address signals in a second of said plurality of messages and couple same to said transmitter during said first predetermined time period after said first deactuation of said switch, said audio delay means being operative in response to said second actuation of said switch and said maintained operation of said control means to receive said audio signals in said second of said plurality of messages and delay said audio signals of said second message by said third predetermined time period after said second actuation of said switch and couple said second message delayed audio signals to said transmitter.

Claim 3

The high capacity paging system of claim 1 wherein said address means includes, means for developing a plurality of address signals, and selection means for selecting a particular one of said plurality of address signals to be coupled to said transmitter.

Claim 4

The high capacity paging system of claim 2 wherein said address means includes, circuit means operative in response to said switch actuation to couple said selected address signals to said transmitter for said second predetermined time period.

Claim 5

The high capacity paging systey of claim 3 wherein said control means includes, first switching means operative in response to said switch actuation to develop a first switching signal for actuating said transmitter and audio delay means, and time delay circuit means coupled to said first switching means and said switch and operative in response to deactuation of said switch to hold said first switching means operative for said first predetermined time period.

Claim 6

The high capacity paging system of claim 4 wherein said audio delay means is a tape recorder operative in response to said first switching signal to record said audio signals coupled thereto, said tape recorder including reproducing means for reproducing said audio signals and coupling same to said transmiTter said third predetermined time period after said audio signals are recorded.

Claim 7

The high capacity paging system of claim 5 wherein said circuit means includes monostable multivibrator means operative in response to said switch actuation to change state for said second predetermined time period, and gate means coupled to said monostable multivibrator means and to said transmitter, said gate means operative in response to said change of state of said monostable multivibrator means to couple said selected address signals to said transmitter.

Claim 8

The high capacity paging system of claim 6 wherein said first switching means is a relay, and said time delay circuit means is a monostable multivibrator.

Claim 9

The high capacity paging system of claim 7 wherein said tape recorder includes an endless magnetic recording tape for recording said audio signals, means for rotating said magnetic tape, recording means for receiving said audio signals, said recording means operative in response to receipt of said audio signals to record same on said rotating magnetic recording tape, playback means for reproducing said audio signals from said rotating magnetic tape said first predetermined time period after said audio signals are recorded thereon, and erase means for erasing said recorded audio signals from said rotating magnetic tape after reproduction by said playback means.

Claim 10

The high capacity paging system of claim 8 wherein said tape recorder further includes motor means coupled to said endless magnetic recording tape and operative to rotate said magnetic tape, and second relay means coupled to said motor means and said first switching means and operative in response to said first switching signal to actuate said motor means.

Claim 11

The high capacity paging system of claim 9 further including microphone means for converting speech to said audio signals, said microphone means being coupled to said audio delay means for coupling said audio signals thereto.

Claim 12

The high capacity paging system of claim 10 wherein said address signals are subaudible tone signals.

Claim 13

The high capacity paging system of claim 11 wherein said means for developing a plurality of address signals includes, oscillator means for developing said subaudible tone signals, said selector means being operative to select particular ones of said subaudible tone signals.

Claim 14

The high capacity paging system of claim 11 wherein said address signals include, a plurality of subaudible tone signals, said selector means being operative to select said plurality of said subaudible tone signals to form said address signals.

Claim 15

In a high capacity paging system including a transmitter for transmitting a modulated signal in response to a plurality of messages sent in sequence with each message including subaudible tone signals and audio signals, coupled thereto, and wherein each transmission is initiated by a switch being actuated, and the message terminated by deactuating the switch, the combination including, control means coupled to said switch and transmitter and operative in response to a first actuation of said switch to actuate said transmitter, said control means further including time delay means for holding said control means operative for a first predetermined time period after a first deactuation of said switch, address means for developing said subaudible tone signals coupled to said switch and transmitter and operative in response to said first actuation of said switch to develop said subaudible tone signals in a first of said plurality of messages and couple said subaudible tone signals to said transmitter for a second predetermined time period no greater than said first predetermined time period, audio delay means coupled to said control means and said transmitter, said audio delay means operative in response to said control means operation to receive said audio signals in said first message and delay said audio signals by a third predetermined time period greater than said second predetermined time period and no greater than said first predetermined time period and couple said delayed audio signals to said transmitter, said control means being further operative in response to a second actuation of said switch during said first predetermined time period after said first deactuation of said switch to maintain said transmitter and audio delay means operative and to reset said first delay means for holding said control means operative for another first predetermined time period after a second deactuation of said switch, said address means being operative in response to said second actuation of said switch to develop said subaudible tone signals in a second of said plurality of messages and couple same to said transmitter during said first predetermined time period after said first deactuation of said switch, said audio delay means being operative in response to said second actuation of said switch and said maintained operation of said control means to receive said audio signals in said second of said plurality of messages and delay said audio signals of said second message by said third predetermined time period after said second actuation of said switch and couple said second message delayed audio signals to said transmitter.

Claim 16

In a high capacity paging system including a transmitter for transmitting a modulated signal in response to a plurality of messages sent in sequence with each message including subaudible tone signals and audio signals, coupled thereto, and wherein each transmission is initiated by a switch being actuated, and the message terminated by deactuating the switch, the combination including, control means coupled to said switch and transmitter and operative in response to a first actuation of said switch to actuate said transmitter, said control means further including time delay means for holding said control means operative for a first predetermined time period after a first deactuation of said switch, address means for developing said subaudible tone signals coupled to said switch and transmitter and operative in response to said first actuation of said switch to develop said subaudible tone signals in a first of said plurality of messages and couple said subaudible tone signals to said transmitter for a second predetermined time period no greater than said first predetermined time period, audio delay means coupled to said control means and said transmitter, said audio delay means operative in response to said control means operation to receive said audio signals in said first message and delay said audio signals by a third predetermined time period greater than said second predetermined time period and no greater than said first predetermined time period and couple said delayed audio signals to said transmitter, said control means being further operative in response to a second actuation of said switch during said first predetermined time period after said first deactuation of said switch to maintain said transmitter and audio delay means operative and to reset said first delay means for holding said control means operative for another first predetermined time period after a second deactuation of said switch, said address means being operative in response to said second actuation of said switch to develop said subaudible tone signals in a second of said plurality of messages and couple same to said transmitter during said first predetermined time period after said first deactuation of said switch, said audio delay means being operative in response to said second actuation of said switch and said maintained operation of said control means to receive said audio signals in said second of said plurality of messages and delay said audio signals of said second message by said third predetermined time period after said second actuation of said switch and couple said second message delayed audio signals to said transmitter.

Claim 17

The high capacity paging system of claim 14 wherein said address means includes means for developing a plurality of subaudible tone signals, and selection means for selecting particular ones of said plurality of subaudible tone signals to be developed.

Claim 18

The high capacity paging system of claim 15 wherein said means for developing a plurality of subaudible tone signals includes a plurality of oscillator means, said selector means being operative to select particular ones of said subaudible tone signals.

Claim 19

The high capacity paging system of claim 16 wherein said address means includes circuit means operative in response to said switch actuation to sequentially couple said selected subaudible tone signals therefrom for said second predetermined time period.

Claim 20

The high capacity paging system of claim 17 wherein said control means includes, first switching means operative in response to said switch actuation to develop a first switching signal for actuating said transmitter and said audio delay means, and time delay circuit means coupled to said first switching means and said switch and operative in response to deactuation of said switch to hold said switching means operative for said first predetermined time period.

Claim 21

The high capacity paging system of claim 18 wherein said audio delay means is a tape recorder operative in response to said first switching signal to record said audio signals coupled thereto, and including reproducing means for reproducing said audio signals and coupling same to said transmitter said third predetermined time period after said audio signals are recorded.

Claim 22

In a high capacity paging system including a transmitter for transmitting a modulated signal in response to a message coupled thereto including address signals having a second predetermined time period followed by audio signals, and wherein said transmission is actuated by operation of a switch and said message terminated by deactuation of said switch, the method of transmitting said message comprising the steps of; actuating said switch to initiate a first transmission, initiating said transmission of a first message address signals for said second predetermined time period upon actuation of said switch, developing said audio signals of said first message simultaneously with transmission of said first message address signals, delaying said transmission of said audio signals by a third predetermined time period not less than said second predetermined time period and no greater than said first predetermined time period, terminating said first message by deactuating said switch, maintaining transmission for said first predetermined time period after termination of said first message, actuating said switch to initiate a second transmission and initIating said transmission of a second message address signals for said second predetermined time period during said first predetermined time period after termination of said first message, developing said audio signals of said second message simultaneously with transmission of said second message address signals, delaying said audio signals of said second message by said third predetermined time period after said second actuation of said switch.

Claim 23

In a high capacity paging system including a transmitter for transmitting a modulated signal in response to a message coupled thereto including address signals having a second predetermined time period followed by audio signals, and wherein said transmission is actuated by operation of a switch and said message terminated by deactuation of said switch, the method of transmitting said message comprising the steps of; actuating said switch to initiate a first transmission, initiating said transmission of a first message address signals for said second predetermined time period upon actuation of said switch, developing said audio signals of said first message simultaneously with transmission of said first message address signals, delaying said transmission of said audio signals by a third predetermined time period not less than said second predetermined time period and no greater than said first predetermined time period, terminating said first message by deactuating said switch, maintaining transmission for said first predetermined time period after termination of said first message, actuating said switch to initiate a second transmission and initIating said transmission of a second message address signals for said second predetermined time period during said first predetermined time period after termination of said first message, developing said audio signals of said second message simultaneously with transmission of said second message address signals, delaying said audio signals of said second message by said third predetermined time period after said second actuation of said switch.

Claim 24

The method as set forth in claim 20 wherein said address signals are selectable from a plurality of address signals and including the step of selecting the desired address signals for transmission.

Claim 25

The method as set forth in claim 21 wherein said address signals are subaudible tone signals and including the step of selecting the desired subaudible tone signals for transmission.