DE2259767B2 - Selective signal transmission device - Google Patents

Description

The invention relates to a selective signal transmission device with a decoder for generating a signal depending on a particular Code signal and alarm devices coupled to the decoder, which are based on the output signal of the Decoder can be operated.

With various selective call systems, such as B. with paging receivers that have an audible ringing tone generate, it is desirable in some cases to suppress the audible ringing tone generation. So can z. B. a pager can be worn by a doctor who desires it during treatment of a patient is not disturbed by the ringing tone. However, it is desirable that as soon as the doctor consults is in a state of readiness for receiving the call, he should be able to determine whether he has been called. So far it was only possible to stop the ringing tone prevent the pager from being switched off completely. This can cause a message to be lost.

ίο during the time during which the call receiver is not in operation and at the same time there is no indication that a call has actually been received is.

Although it is known to use storage devices

'5 Provide for storing information, find such no use for paging receivers because they are too large and expensive. This is especially true for Pagers that can be carried in your pocket. Known storage devices for pager receivers require additional equipment parts, which also consume a lot of energy, so that they for Battery operated paging receivers are not suitable. Such storage devices are also proportionate expensive and greatly increases the cost of pagers.

The invention is based on the object of creating a selective signal transmission system which the ringer can be turned off and the call information can be saved to convert it to a to be able to query later. Such a device should be able to be created with very few components and only need a very low power requirement, the decoder being kept in operation for the ringing tone to keep the ringing tone until the decoder is turned off by interrogations.

According to the invention, this task is solved by that responding to the output signal of the decoder with the alarm devices, selectively operable Control devices are available that make the alarm devices ineffective that with the Decoder is coupled to a memory stage which is responsive to the decoder output signal and the decoder holds in a switching state in which the output signal is maintained, and that reset devices are available to reset the memory level.

According to a development of the invention it is provided that switch devices for transmitting the Decoder output signal to the control circuit are to end the response of the control circuit to the decoder output signal and the To control the memory level to release the locked decoder output.

It is also expedient for the resetting devices to comprise switch devices in order to control the storage stage to operate in such a way that the decoder output is released and the storage stage for one reuse is deferred.

Another embodiment of the invention is that the Schalteinrichtungcn in a first and second switching position are displaceable, the storage stage for release in the first switching position of the decoder output can be actuated and in the second switching stage the storage stage for renewed operation is resettable. Another feature of the invention is that the memory stage has a first Part includes which is coupled to the decoder and essentially without delay the decoder in loading

drove holds, and that a second part of the storage stage is coupled to the decoder and keeps it in operation after a given time delay.

A selective signal transmission system constructed according to the features of the invention in the form of a The paging receiver comprises a decoder which is responsive to the paging signals, for example in the form of two-tone sequences. The call decoder contains an oscillator and is connected to an audio amplifier to receive the from Oscillator generated ringing tone or alarm tone to make audible. The NF amplifier can also be used for Transmission and amplification of the transmitted message are used. With the decoder is a storage stage connected via a switch, which is also connected to the audio amplifier .si. This storage level comprises a first part, in which the LF amplifier can be switched off when the decoder has an output signal supplies. so that the alarm sound provided by the oscillator is not played back. A second part the storage stage holds the decoder in a state in which the output signal is continuously emitted will. A circuit part that works without delay ensures that the call is not lost, whereas a second circuit section, which works with a delay, the decoder in the operating state holds after the audio amplifier is switched on. A linked to the storage stage Reset switch acts on this in such a way that it switches on the LF amplifier and the locked one Decoder enables after a certain time has passed after the end of the decoder output signal. The reset circuit is combined with another circuit that stores the decoder operation prevents when the pager is switched on in order to create an indication that shows that the pager is working properly.

Further details and advantages of the invention emerge from the following description of a Ausfüh ungsbeispiels in connection with both individually and in any combination the claims characterizing the invention and the drawing. It shows

Fig. 1 is the circuit diagram of a pager with a built-in memory stage according to the invention,

FIG. 2 shows the circuit diagram of the memory stage according to FIG. 1.

In Fig. 1 shows the signaling system of the invention as it is used in a pager. The receiver comprises an antenna 10, as well as receiver stages 12 to the received signal reinforce and further process. The receiver can be constructed in a conventional manner, with output signals appearing on conductor 14 and tone call signals on conductor 15. Of the The receiver can also be used to only reproduce the ring signals.

The LF signals are fed to an LF amplifier 16, which comprises the amplifier stages 18, 20 and 22 can. The output signal of the amplifier stage 22 is applied to a converter 24, which acts as a miniature loudspeaker can be formed. The amplifier stages 18, 20 and 22 are by a potential selectively excited, which is fed from terminal 26 via a regulator stage 28 to the amplifier stages will. The Rcgulaiorstufc 28 is of a Poicntiai controlled, which is fed from an OR gate.

The ringer signal supplied by the receiver is fed via the line 15 and a capacitor 32 to active filters 34 and 36 which are matched to ringing tone frequencies A and B and these are composed of a possibly present audio frequency mixture

sieve out and feed to a detector 35. The ringing tone A is fed to a threshold value detector 38 which discharges a capacitor 39 which is normally charged by the supply voltage via a resistor 40. At the end of the ring A

ίο charges the capacitor in order to control an inverter 42, via which a capacitor 43 is discharged very quickly. The negative voltage, effective at capacitor 43, is fed via a capacitor 44 to an inverter 45, with the result that a low input signal is effective at this. This input signal remains at a low value until the capacitors 44 and 43 are charged via a resistor 41 by the applied supply voltage. The low input to the inverter 45 bewirk ¹ ..in high input signal to the AND gate 46. D ^ r A ringer must be received for a certain period of time to charge the capacitor 39 to be discharged to a given level. This is a protective measure to make undesired, short-term signals of the ringing frequency A ineffective. The high input to AND gate 46 is delayed by the charging of the capacitor 39 and the discharging of the capacitor 43.

In the same way, the filter 36 for the selection of the ringing tone frequency B is followed by a threshold value detector 48 which responds to the ringing tone B and discharges a capacitor 49 which is normally held in the charged state via the resistor 50 from the supply voltage. The voltage on the capacitor 49 is fed to the second input of the AND gate 46 via an inverter 52 and an OR gate 54. If the ringing tone B is received during the time period following the ringing tone A , so that a high input signal is applied from the inverter 45 to the AND gate 46, then a direct current potential is effective on the output side on the line 56 from the AND gate. This DC potential is across a resistor 58 and the line

59 effective at one input of the OR gate 30 in the LF amplifier 16 in order to switch on the regulator stage 28, so that the LF amplifier is put into operation. The signal on the line 56 is also applied to the input of the inverter 45 via an inverter 57. The input signal is thus maintained at one input of the AND gate 46 as long as a signal is emitted on the output side of this AND gate 46. It follows that the AND gate 46 remains in operation as long as the ringing tone B is received. The output signal of the AND gate 46 is also sent from the line 56 to an astable circuit

60 created in decoder 35. This produces an output signal via the inverter 62 at the AND gate 64 effective, at which the output signal of AND gate 46 effective on line 56 is effective. DcdTigenriß becomes 64 from the AND age intermittently energized a tone oscillator 66, the audio frequency signals via a line 68 to the input the amplifier run 20 applies. These audio frequency signals are generated by the amplifier stages 20 and 22 amplified and reproduced in loudspeaker 24.

If the decoder is used in a receiver that responds only to ring tones, the signal effective on line 56 is also transmitted via a resistor 70 and a capacitor 71 to a line 69 which is connected to the temporary input of the OR gate 54 . This OR gate transfers a potential to the second input of the AND gate 46 for the time after the end of the ringing tone B. Thus, the decoder causes the oscillator 66 to operate as long as the ringing tone B is received and also for an additional period of time is determined by the values of resistor 70 and capacitor 71.

With the LF amplifier 16 and the decoder 35, a memory stage 75 is coupled with a Terminal 76 is connected to line 56 and via this to the output signal of decoder 35 is controlled. This terminal 76 is via a switch 78 and a line 79 to the base of a Transistor 80 connected. The emitter of this transistor is connected to ground and the collector of this transistor is connected to the line 59, which is connected to one input of the OR gate 30 in the LF amplifier 16 lies. Therefore, when switch 78 is closed, the output of the decoder acts on the line 56 at the base of transistor 80 and makes it conductive so that line 59 is connected to ground, and no potential is transmitted via this to the OR gate 30 for switching on the regulator stage 28 can be. Dam »! the LF side remains switched off when the decoder responds to a coded ringing signal.

The signal effective on conductor 79 is also applied to one input of an AND gate 82, the second input of which is normally subjected to a high signal via an inverter 84 is, so that the AND gate gives a positive output signal. This output signal is over the line 85 and the line 69 applied to the second input of the OR gate 54 in the decoder 35 to to keep this in operation if the ringing tone B fails. The AND gate 46 thus also gives continuously an output signal via the line 56 continues for so long. as long as switch 78 is closed and AND gate 82 provides an output signal.

The effective potential on line 79 of storage stage 75 is also applied to the input of a AND gate 86 is applied. The second input of this AND gate 86 is at a connection point 97 connected, which is also connected to the LF amplifier 16. This connection point 97 is connected to a positive supply voltage within the LF amplifier 16 via a resistor 98, which is applied to terminal 26. A signal with a high potential value thus acts on the AND gate 86 and generates an output signal which is fed to a delay stage 88. This delay stage makes transistor 90 conductive according to a given one Delay time, which can be on the order of two seconds. On the Transistor 90 is applied to ground potential on conductor 92, which leads to inverter 52 and causes that a signal with a high signal value is present at the OR gate 94. From the storage stage 75 is a Second input signal transmitted to the OR gate 54, which with respect to the via the line 69 applied signal is delayed. The transmitted through the OR gate 54 and at the AND gate 46 effective signal holds this AND gate 46 for a certain period of time after the end of the Conductor 69 effective signal when switched on.

The memory stage 75 is assigned a reset switch 95 which, in the closed state, is grounded the emitter of transistor 96 is applied, so that this transistor becomes conductive and ground potential at the connection point 97 is effective. This connection point is also connected to the reversing stage 99, which is connected to the second input of the OR gate 30 in the LF amplifier 16. This reversal stage provides an output signal with a high signal value, which is fed through the ODFR gate 30 to the regulator stage 28 is transmitted to turn on the amplifier. This turns on the LF amplifier 16, even if switch 78 is still closed and on line 59 via transistor 80 Ground potential.

The ground potential from junction 97 is also applied to the second input of the AND gate

86 and applied to the reversing stage 87. Thus, the output of AND gate 86 falls on one low signal value, which means that the

Delay stage 88 is not applicable. About the reverse stage

87 becomes a positive signal at the delay stage

88 effective, whereby this is reset. This instantly drops the transistor bias 90, so that this ceases to conduct. This also disconnects the ground potential from line 92, with which the decoder 35 is blocked. The capacitor 49 then charges up via the resistor 50 and supplies a positive potential to the inverter 52.

When the reset switch 95 is opened, the transistor 96 is rendered non-conductive, so that the Connection point 97 rises to a high potential value. A one-pulse generator 100 is thus triggered and provides a signal to inverter 84.

This inverter, in turn, provides a signal with a low signal value for the two second period of the pulse generator 100 to the AND gate 82, whereby its output signal drops and that via the Line 85 at the second input of the OR gate 54 turns off holding potential. In order to the decoder is switched off so that the signal effective on line 56 ceases to act and a low signal level at the OR gate 30 is effective. Since the connection point 97 is on the If the supply voltage is at potential, a low signal value is output via the inverter 99 OR gate 30 effective, so that both inputs of this OR gate with a low Signalwer are acted upon and the regulator stage is switched off, d. H. the power supply from the audio amplifier 16 is switched off.

The switch 78 can be part of the main switch with which the pager is switched on and off will. This main switch can have a variety of switch positions, one of which is off switch the call receiver, a second to Eir switch the call receiver for normal Rufbetrie and a third can serve to switch on the memory function, this third switch position dei Switch 78 corresponds. The switch 78 is open when the call receiver for normal Rufbetrie is switched on. So there is no 79 on the I-line Potential effective, so that the transistor 80 not all

lend and unlocked the audio amplifier, d. H. this for the playback of the alarm calls from the oscillator 66 of the decoder. So that too AND gate 82 inoperative, so that the potential on line 85 is removed. The potential on the Line 69, which is connected to the / wide input of OR gate 54, is activated by the action of the capacitor 61 and the resistors 70, 72 and 73 are maintained for a short time. Likewise the AND gate 86 is ineffective, so that the transistor 90 with the delay stage 88 conditional delay becomes non-conductive. This causes the stored calls after switching on of the pager and the operation of the reset switch 95 are reproduced. Of the The main switch of the paging receiver can be a slide switch with three switch positions, with which the Rückicllscliiiltcr 95 is coupled so that it is actuated whenever the main switch is operated.

The system described with reference to FIG. 1 is suitable for use with ringer receivers, d. H. for pagers that play a tone, to indicate to a person wearing the pager that there is a message for them. This person must then go to a telephone and call a center, or a certain part of the subscriber, in order to receive the message through this. However, there are also pagers that have both transmit the ringtone as well as the message. iici these recipients will be a waiiiion for short Time generated that the message follows. With a little one It is desirable for pagers that the warning is present for a relatively long time in order to ensure that that the called person hears this too. For this reason, resistor 70 md is the capacitor 71 provided, which the output signal of the decoder also for a certain period of time after the end of the calling code maintained. In the case of a pager for calls and speech traffic, it is not It is desirable that the warning tone is effective longer than the call code, since the message following the call code could be overlaid by the warning sound and thus difficult to understand or not understandable can be.

For this reason, in a paging receiver for paging and speech traffic, the resistor 70 and the capacitor 71 is omitted. Such pagers have a capacitor 74 on the line 69 connected to trigger a short delay after the potential on line 85 is removed has been. The output signal of the decoder is thus maintained on line 56 for a short time. The reset switch 95 is not used for call receivers with gate and speech communication. but rather a switch 102. This switch 102 applies ground directly to junction 97 to reset the storage stage and disconnect the ground potential from conductor 92, which blocks the decoder. This makes it possible to use the canal to monitor both a call and a voice communication.

FIG. 2 shows the circuit structure of an exemplary memory stage according to FIG. 1. These The circuit fulfills the same functions as described with reference to FIG. 1 for the memory stage and therefore corresponding parts have been given the same reference numerals. At the input terminal 76 the direct current signal is taken from the output of the decoder 35 received and via the switch

78 and line 79 to transistor 80, which connects line 59 to ground.

The transistors 105 and 106, which are made conductive by the potential on the line 79 represent one half of the AND gate 82 of FIG. 1. The transistor 108 forms the other half of AND gate 82. If the

ίο transistor 108 conducts, line 85 is connected to ground connected, whereby the AND gate 82 emits an output signal. When transistor 108 is non-conductive is, however, the transistor 106 is made conductive by the effective potential on the conductor 79, the positive potential is transmitted from the supply voltage to the conductor 85 via the transistor 106. This corresponds to the function described with reference to FIG. 1. That on line 85 effective output signal is transmitted via conductor 69 to OR gate 54 of FIG. 1, and also acts simultaneously on the base of transistor 96, the emitter of which is connected to ground via switch 95, as connected in Fig. 1.

The one-pulse generator 100 according to FIG. 1 will formed from transistors 110 and 112 and their associated circuit elements. A capacitor 114 determines the duration of the pulses. Fun Transistor 118 represents the inverter which connects the pulse generator to the second input of the L'ND gate 82 connects, which is formed by the transistor 108, as already mentioned. During the Normally the capacitor 114 is charged via the resistor 115 and the resistor 98, where the contradiction 98 is at the terminal 26 for the supply voltage. This creates a potential effective at the base of the transistor 118, which makes it conductive, and the base of the transistor 108 on Ground connects, so that transistor 108 is turned off will. Accordingly, the transistor 108 is switched off in normal operation and that on the line 85 effective signal depends on the conductivity state of transistor 106, which is on the line

79 effective potential is controlled.

When the pager is switched on for the first time, it takes effect on the basis of the connected Supply voltage a pulse across the capacitor 111 at the base of the transistor 112 and makes this guiding. The capacitor 114 is thus connected to ground and discharged. This is intended that. if the pager is switched off and then immediately switched on again, the Capacitor 114 retains a charge. Accordingly, for a short time when the pager is switched on for the first time, the transistor 108 conductive, so that on the line 85 ground potential is effective and the decoder 35 cannot be blocked. This is desirable because of the Decoder is designed in such a way that an alarm call is generated the first time it is switched on so that one recognizes that the pager is working. However, it is undesirable to save this operation because it is not triggered by a call. The transistor 110 becomes conductive and applies ground to the base of the transistor 112, so that it can only become conductive for a very short time. The capacitor 114 is charged and makes transistor 118 conductive to turn transistor 108 off.

The delay stage 88 of FIG. 1 is from

309540/418

Capacitor 120 is formed and controls the conductivity state of transistor 90. Capacitor 120 is charged through resistor 121 when on the line 79 has a potential which originates from the decoder 35. If there is no potential on line 79 is applied, the capacitor 120 discharges through the resistors Jc 121 and 122. The input signal am second input of the AND gate 86 and the resetting of the delay stage 88 are in the Valley from transistor 124 and 125 causes the between the connection point 97 and the capacitor 120 lie. Since the connection point 97 is normally is at a high signal level, the transistor is

124 normally conducts and holds the transistor

125 when switched off. The capacitor 120 can thus be charged and the transistor 92 can become conductive do when there is no potential from decoder 35 via line 79. As mentioned earlier, will takes some time to charge capacitor 120 and turn transistor 90 on. Accordingly, the blocking of the decoder via line 92 is delayed compared to the blocking over line 85.

When the reset switch 95 is closed and the connection point 97 is kept at ground potential, the transistor 124 is also switched off, thus making transistor 125 conductive. This discharges the capacitor 120 and after the time which is required for falling to a certain charge level (essentially zero) becomes the Transistor 9 <»switched off. Thus, the effective blocking via the line 92 drops, whereas the blocking remains in place via line 85 until the reset switch 95 or the switch is opened 78 is opened.

The memory stage described above is extremely advantageous for storing a call, when it is not desirable for the alarm call to be reproduced audibly. The storage level is very simple structure and requires only a few switching elements and thus very little space inside of the pager. Since the storage stage locks the decoder so that it stores the message, no separate storage facilities are required. The memory level also only requires a, minimal Performance, which is extremely important as pagers usually run on batteries. One Further power savings can be obtained by keeping the astable circuit 60 in the state is recorded in which the oscillator 66 is switched off. You can do this by coupling the Achieve conductor 92 to the astable circuit, since the blocking potential is transmitted via this conductor. In order to current loss otherwise caused by the oscillator during the storage period is eliminated would. In the preceding description, the term blocking is the holding of a to understand certain circuit status.

1 sheet of drawings

Claims (5)

Patent claims: 1. Selective signal transmission device with a decoder for generating a signal in Dependence on a specific code signal and alarm devices coupled to the decoder, which can be actuated by the output signal of the decoder, characterized in that that with the alarm means responsive to the output signal of the decoder selectively operable control devices are available that render the alarm devices ineffective, that a memory stage is coupled to the decoder which is responsive to the decoder output signal and holds the decoder in a switching state in which the output signal is maintained and that reset means are present to reset the memory stage. 2. Signal transmission device according to claim 1, characterized in that switch devices for the transmission of the decoder output signal to the control circuit are available to the response of the control circuit to terminate the decoder output signal and the storage stage to release the held To control the decoder output. 3. Signal transmission device according to claim 1 or 2, characterized in that the Reversing devices comprise shoulder devices to actuate the storage stage in such a way that that the decoder output is released and the memory level for a new use is postponed. 4. Signal transmission device according to claim 3, characterized in that the switch devices are displaceable in a first and second scarf position, in the first Switching position, the storage stage to enable the decoder output can be activated and in the second Switching stage the storage stage can be reset for a new operation. 5. Signal transmission device according to one of claims 1 to 4, characterized in that that the memory stage comprises a first part which is coupled to the decoder and essentially without delay keeps the decoder in operation, and that a second part of the memory stage is coupled to the decoder and this is in operation after a given time delay holds.