DE2908041A1 - WIRELESS TELEPHONE SUB-CONNECTION - Google Patents

Description

19 360 40 / Ko

Tung-Chen WANG, No. 22, Lane 22, Sec. 2, Chorng-Ching p. Rd., Taipei, Republic of China

Wireless telephone extension

The invention relates to a wireless telephone extension suitable for family use, a high Mo ~ has high quality and is convenient to use. The wireless lift connection device can be used to dial a subscriber line be used. A main device connected in parallel to the telephone set is on the subscriber line connected. Between the master and the slave a connection can be established, with only a single channel being used for transmission and reception The from the secondary phone during a certain Signals sent out for a short period of time are received by the main unit, followed by the main unit for a short time Time sends out signals that are received by the secondary telephone » This mode of operation is repeated continuously.

Though the radio transmission is already used in combination with the telephony, zn to switch positions from central offices as part of a telephone connection system connect, but simultaneous transmission and reception in the same area impossible, "Furthermore, the radio transmission is only suitable for certain distances. It is therefore impractical for ordinary telephone subscribers to use extension lines based on the above radio transmission. On the other hand, in a highly industrial

030037/0110

The need for wireless increased in society Extension lines. This need can be met with the present invention.

The device according to the invention for the wireless secondary connection consists of two units, namely a master and a slave. The main unit is on a telephone line connected in parallel to the subscriber's main telephone and is so in connection with its slave set that it can be dialed with the help of dialing signals sent out by the slave set can perform the dialing process. The secondary set from which dialing is made is then at the same time as the main set connected in a wireless manner.

The main unit has a transmitter that works intermittently and in which use is made of double modulation. The audio frequency from the subscriber line is initially used to modulate a low-frequency inertia. The subcarrier thus modulated is then used to modulate a high-frequency main carrier used, which ultimately radiated will.

Furthermore, the main unit has a receiver, which is normally is switched to "standby" and is therefore always ready to receive. When receiving the demodulation executed twice to obtain the beep. The resonance frequency in the first demodulation is equal to the main carrier frequency. The audio signal, which is obtained after the second demodulation, is further processed with the help of a given below in more detail logic control circuit on two separate lines. The one route for the tone signal leads to the subscriber line. The other route leads to the dial tone or dial signal discriminator. The election signal discriminator also has an electronic switch for "receiving" or "not receiving"

030037/0110

on that of a logic signal (high level or low Level) is controlled from the logic control circuit.

The control logic circuit has a circuit for discrimination of the two separate frequencies of the dial signal, one of which is 1 and the other which is 0. Filter circuits are used to smooth the signals with a high level and the signals with a low level. The signals with high level from the two filter circuits are then used for negative triggering of a monostable circuit, after walking through an Oder gate. A synchronizing clock signal is generated with the aid of a further circuit for the serially transmitted data. The output signal from one of the two filter circuits and the synchronization signal are fed to a shift register! Outputs data in parallel, and the parallel data are then fed to the dialing device.

Further filters are provided in order to avoid those from the first demodulator of the receiver received high level signals au, as well as one by this high level signal negatively triggered monostable circuit and a circuit controlled by the monostable circuit for switching on of the transmitter and to switch off the receiver at the same time.

The wireless slave set also includes a transmitter, a receiver, and control logic circuitry. The mode of operation of the transmitter and receiver corresponds to that of the main unit. The change from transmit ¹¹ to receive and vice versa is controlled by pulse signals from the logic control circuit, which also bsw a selection device. has a set of buttons and a device connected to it for sending out serial signals corresponding to the individual buttons. Furthermore, a two-frequency generating tone generator for the discrete states "0" and "1" is provided. If they get through

© 30037/0110

■■■ j-y.

the actuation of the keys resulting in O and 1 signals to the generator are fed, tones with two different frequencies are generated to modulate the subcarrier. The first Modulation is done like this. The logic control circuit also has a device for generating pulses and for controlling the change between transmission and reception mode.

Further details, features and advantages of the invention result from the accompanying drawing and the description below. In the drawing show:

FIG. 1 shows the block diagram of a transmitter and receiver arrangement of a wireless auxiliary device.

Figure 2 the logic control circuit of a wireless Auxiliary equipment,

FIG. 3 shows the block diagram of a transmitter and receiver arrangement and part of the logic Control circuit provided in a main unit,

Figure 4 the logic control circuit of the main unit,

FIG. 5 shows the circuits of blocks F1, F2 and F3 in FIGS. 3 and

Figure 6 shows the circuit of block H in Figure 3 and the Pulse course at the respective points (1), (2), (3), (4), and (5) of the circuit in this Figure.

The schematic circuit diagrams of Figures 1 to 6 show a practical embodiment of the invention, wherein in the figures

030037/0110

- ■ 9 -

1 and 2 show the circuitry of the wireless slave set is. Figures 3 and 4 show the main device with the subscriber line connected is. Figure 5 shows the circuits of the blocks F1, F2, and F3 in Figure 3 and Figure 6 den Block H.

First, Figures 1 and 2 will be explained in more detail; The individual parts of Figure 1 have the following meaning;

^M l
C. G

High frequency amplifier

first modulation stage

Subcarrier generator

second modulation stage

Main carrier generator

an electronic switch for sending and controlling

an electronic switch for reception control first demodulator

second demodulator

Audio frequency amplifier
E,, £ ": tone frequency generators for generating two different frequencies that correspond to the discrete states

"1" and "0" are assigned, SW -.- SW5: the associated electronic switches for control the delivery of the output signals from B, E .. and E "

M with regard to the modulation of the subcarrier (I,} - {!.}: connections which are connected to the connections (I ·,) - (I ₄ ) in FIG.

In Figure 2, the individual parts have the following meaning?

K _Q -K: Selector keys which, when pressed, send a signal iait high level to the input of an encoder ED.

130037/0110

so that a set of output data corresponding to the selected number is obtained.

ED: Encoder that works according to the following coding table.

De
OSC

1 2 INPUTS k 5 6th 7th 8th 9 OUTPUTS U C. IJ 0 O 0 3 0 0 0 0 0 0 A. O 1 0 1 1 O 0 0 0 0 0 0 0 1 0 0 1 0 0 1 0 0 0 0 O 0 O 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 0 0 0 1 1 0 O 0 0 0 0 1 O O 0 0 0 0 0 Ι 0 0 0 0 0 1 0 1 0 0 0 0 0 Ο 1 0 0 0 0 1 1 O 0 0 0 0 0 0 0 1 0 0 0 1 1 1 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 0 0 1 0 0 1

(Storage elements)
Holding elements, where s is the control input and R is the

Reset input is.

a seven-digit cycle counter that converts the parallel output signals from ED into serial signals. When pulses are applied to the in port, output ports 0-6 go high in sequence Level on.

Delay circuit

Pulse generator, the output of which controls the change from transmission to reception and vice versa, and which with the help a suitable parameter X for the conversion of the parallel signals into serial signals.

The circuits of Figures 1 and 2 work as follows:

© 3 0 0 37/0110

1.) The switch S is an ON-OFF switch that applies the supply voltage to all circuits. At the moment of switching on the R, a sudden impulse arises, whereby the output 0 assumes a high level and the output 1 of the flip-flop f assumes a low level. L _Q - L and CT are also reset, so that terminal 0 of CT, a high level and terminals 1-6 of CT each have a low level.

2.} Now if I, is low, n. Takes one high level and transmission will start. On the other hand, the incoming audio signals at connection 9 do not pass through SW-, since I, is a low level Has.

3.) It is assumed that one of the keys K, (i = 0,1 ..... 9) is depressed, then a code corresponding to the key number is output from ED and held or stored _{by L 1 -L} . The output of the storage _{element L Q} now also assumes a high level, so that the pulse signals divided by X in the divider can pass through a and reach CT. CT, then takes care of the retrieval of the signals at the outputs e of L, -L., Which run through a, - a, and are output _{as serial data at connection O 1.} After passing through a _c and a ,, the serial data appear at I “and I_ (with a high level at I _? And with a low level at I_). The tone generators E, and E _? the LF signals under the control of I "and I, for modulation of the subcarrier M ₁ output.

4.) After a set of parallel data from the output of ED has been converted into a set of serial data, as described under point 3.), the connection 6 of CT ₁ goes high, whereby CT ₁ and L >> - L . to be postponed,

03003-7 / 6-110

so that the circuit returns to the state that prevailed before the actuation of the key K. (i = 0,1 .... 9).

5.) When another key K is pressed, terminal 1 of f goes high. If a low! Level is present, then the pulses from OSC run through a_hir and are delivered to I ₄ . Then do SW. and SW_ open and close. This is the situation in two-way communication ·.

The circuits of Figures 3 and 4 will now be explained in more detail below:

The individual parts in FIG. 3 have the following meanings: Ai, A 'm' m 'D.', υ 'CG. ' CG' SW /, SW 'and b'

Λ. / L X. L ·, ■ L · ^. -L £ * J- ti

correspond in the given order to the units A ,, A ₂ , M ₁ , M ₂ , D ₁ , D ₂ , CG ₁ , CG ₂ , SW ₁ , SW ₂ and B. MO ₁ , MO ₃ and MO- are negatively activated monostable circuits, each of which emits a timed high-level output signal at the moment a high level appears at the input.

F ,, F _? and F, are filters, the circuit structure of which is shown in detail in FIG. The filters turn the signals into continuous signals with a constant high level.

The circuit structure of the block H is shown in detail in FIG 6 specified. If the input stays at a high level for a period of time, the output will also appear continuously a high level. However, if there is a low level or a pulse signal at the input, then a will also appear at the output low level.

G is a separating circuit, with the help of which the NF signals

© 30037/0110

different frequency the logic switching states "1" and "0" can be obtained. The output signal "1" is output at connection 1 and the output signal "0" is output at connection 0.

Y ₁ - Yy. are connections which are connected to the connections J- - J- of FIG.

The individual parts of Figure 4 have the following meaning:

SR is a shift register that converts the serial data into parallel Converts data. J_ and J. are the respective input terminals for the input data and the synchronizing clock pulse.

CT “is a counter that counts after every fourth input signal high level outputs a high level output signal.

PD acts as a pulse selector and converts the input data into serial output data with a corresponding number of Square waves around. The period of the output signals with high level is 67 ms, while that of the output signals with low level Level is 33 ms. The selection device also acts as a memory or holding circuit, so that when the serial output signals of a previous data record has not been completely transferred, the incoming data record temporarily is held until the previous input data has been completely processed. Only then will the following Data processed. The pulse selector can be made using Motorola products such as MC14408 or MC14409.

W is the part of the circuit that is attached to the phone is. The connections IJ-V are connected to the subscriber line tied together. Q, is the select transistor that is used to select

83003? / Ö1tÖ

If

turns on and off. After completing the dialing process, establishing the line connection to the called subscriber Q- returns the voltage between U-V to the maintenance shark establishment of a continuous line connection.

T either picks up the audio signals from the line or feeds them to the line. C ₃ is used to short-circuit the high-frequency noise signals that originate from the environment.

The circuits of Figures 3 and 4 work as follows:

1.) The wireless slave set is constantly transmitting while it is dialing. A continuously high output signal appears at connection D ₁ . A continuous high-level output signal also appears at the output of H. SW ,. is switched on and SW- is switched off. Therefore he

⁶ / will

the dialing signal appears as the output signal from D '' and the unit G supplied for separation.

2.) The signals "1" and "0" obtained from G are taken from the output of F ₁ to form data records, while the output signals from O- are used as synchronization signals. _{CT 2} now emits an output signal for every fourth input signal with a high level. After four pulses, SR has just converted a set of serial data into a parallel data set. The high output from CT simply ensures that the dial signals are passed to PD.

3.) Every time H goes high, a short-lived one occurs Impulse at connection J, on. This impulse represents CT " back, which is then starting again from its initial state starts to work.

4.) If a continuous signal with a high level is emitted at the output of F _{1, two-}

© 30037 / 011Ö

rock-free also a continuous signal with a high level. When the input signals of S _{1 are} pulses, the output of F _{1 is} low, while the output of MO _{1 is} high. This is why there is also a high level at the output of 0 “. In other words, regardless of whether the call is dialed or the two-way call is being made, O emits a constant output signal with a high level to maintain the connection of the telephone circuit W.

5.} If the call is on the way, d. a train of pulses, as shown, because the wireless slave set transmits intermittently · Since the output of H is at a low level, SW _g switches on from _T and SW_. The output signal from D _{91 is output to} the telephone circuit via j.

When the wireless slave set stops transmitting and goes into "standby" for receiving, the output of MO ₁ goes high and η 'goes low. Polarity switches SW | on and SWl off so that it sends and does not receive. The conversation from the telephone circuit

/ der Ein » ^e it

is then transmitted via T ^, and at the connection u _? B 'supplied. FIG. 5 shows the circuits of. F _{1 f} F ₀ and F the

Figure 3. When a continuous pulse signal is supplied, its current is first amplified and flowed by Am. then through a diode and the filter circuit C ₄ , R-. By utilizing the saturation range of Q ₃ ¹ S, the collector voltage of Q ₃ remains at a low value over the entire pulse duration of the pulse pending at the "INT" connection. As a result, there is a high level signal at terminal n, -.

Figure 6 shows the circuit of block H of Figure 3. If the high level of the input signal at 1 lasts longer than the

• 30037 / ίΐtu

/ tb

duration mentioned above, 2 assumes a low value, since 4 also assumes a high value. 5 then also takes one high value. However, if the input signal at 1 is a pulse signal, 2 will have both positive and negative Impulses, from which only the positive impulses are of importance are. Since similar considerations also apply with regard to FIG. 5, it follows that 4 has a low level and consequently 5 also assumes a low level.

The waveforms at the connections or points 1, 2, 3, 4 and 5 and their relationship to one another are shown by the curves on the axes X 1, X_, X-, X- and X ₅ .

• 3003-7 / 6-110

Claims (6)

ΑΙ, Τβ «X. nat, DIETER OUJf
iPh CLAUS PÖHLAU pay-off ^{19 360 40 / Ko} »600 NUREMBERG Tung-Chen WANG, Mon. 22, Lane 22, Sec. 2, Chorng-Chlng S. Rd., Taipei, Republic of China Wireless telephone extension Claims A wireless telephone extension device, which is characterized by the following features: The device consists of two units, namely a master and a slave. The main unit is connected to a Telephone line connected in parallel to the main device of the subscriber and is thus in connection with his secondary set that with the help of dialing signals sent out by the secondary set the dialing process can perform. The secondary set from which dialing is made is then on at the same time as the main set wirelessly connected. The main unit has a transmitter that works intermittently and at which is made use of a double modulation. The audio frequency from the subscriber line is initially used to modulate a low frequency carrier. The subcarrier modulated in this way then becomes the Modulating a high frequency main carrier is used, which is ultimately radiated. Furthermore, the Main unit has a receiver that is normally switched to "standby" (waiting position) and therefore always is ready to receive. When receiving, the demodulation must be carried out twice in order to generate the audio signal Q3003f / Öt10 win. The resonance frequency for the first demodulation is equal to the main carrier frequency. The audio signal that is obtained after the second demodulation is with Given the help of a logic control circuit described in more detail below on two separate lines. The one Leitüngsweg for the tone signal leads to the subscriber line. The other route leads to the dial tone or dial signal discriminator. The voting signal discriminator also has an electronic switch for "reception" or "non-reception", which is controlled by a logical Signal (high level or low level) from the control logic circuit is controlled. The logical one The control circuit has a circuit for differentiating the two frequencies of the selection signal that are separated from one another of which one is 1 and the other is 0. Filter circuits are used to smooth the signals with high and the low level signals. The high level signals from the two filter circuits then become the negative triggering of a monostable circuit is used after going through an OR gate. With the help of another circuit, a synchronizing clock signal is generated for the serially transmitted data obtain. The output signal from one of the two filter circuits and the synchronization signal become one Shift register which outputs the serial data in parallel, and the parallel data then becomes the Selector supplied. Further filters are provided in order to avoid those from the first demodulator of the receiver to smooth received signals with a high level, as well as a negative triggered by this signal with a high level monostable circuit and a circuit controlled by the monostable circuit for switching on the transmitter and to switch off the receiver at the same time. The wireless slave also has a transmitter, a Receiver and a logic control circuit. the 030037/0110 Operation of the transmitter and receiver correspond to the of the main unit. The change from sending to receiving and vice versa is triggered by pulse signals from the logical Control circuit controlled, which also has a selection device or a set of buttons and one connected to it Has means for sending serial signals corresponding to the individual keys. Furthermore is a two-frequency generating tone generator for the discrete states "0" and "1" is provided. If the If the 0 -! signals are fed to the generator when the keys are pressed, tones with two different frequencies for modulating the subcarrier generated. The first modulation is carried out in this way. the Logical control circuit also has a device for generating pulses and for controlling the change between sending and receiving. 2. Device according to claim 1, characterized in that the logic control circuit in the main unit and in the » wireless extension set instead of discrete circuits Components have a microprocessor for the switching functions required for processing a Sof twareprograisms between the inputs and outputs. 3. Apparatus according to claim 1, characterized in that a pulse signal for controlling the change between transmit and receive mode is supplied to the wireless slave set and that the main device has a negatively triggered monostable circuit, the The monostable circuit outputs a high level signal to the main unit when the transmission is stopped of the wireless secondary set is on transmission to switch. 4. Apparatus according to claim 1, characterized in that, 83003? / 6-11Q when the dial signal is sent out from the wireless slave set is fed, the dialing signal in the main unit is fed to a separating circuit which is controlled by a pulse signal and a demodulator that maintains the high level signal over a period of time, so that the discrete states "0" and "1" are obtained, and that the demodulator is a coupling device for receiving a pulse signal and a filter circuit for converting the pulse signal into a continuous one Output signal having a high level, in the case of a pulse signal at the input, the output signal of the filter circuit is continuously held at a high level, so that the resulting output signal of the demodulator has a low level and not a high level for the supply of the selection signal is needed for the separating circuit. 5. The device according to claim 1, characterized in that in the main device after receiving the switching states "0" and "1" from the separating circuit, the data via the respective filter circuits for converting the data into continuous signals with a high level and then passed through the respective negatively triggered monostable circuits », until they get to an OR gate to emit a synchronizing pulse signal, with each output signal represents a bit of the dialing data from the filter circles. 6. Apparatus according to claim 1, characterized in that the wireless slave set has input control circuitry that receives the dial signal and controls the audio signal into the first modulation circuit for modulating the subcarrier, whereby from a flip-flop Use is made, which feeds the audio signal to the first modulator, but blocks the dialing signal. 030037/0110