JPS6055741A - Full break-in keying transmitter and receiver circuit - Google Patents

Abstract

PURPOSE:To set automatically the receiving frequency at a transmission end time to the frequency of a break-in signal by inputting a transmission/reception decision signal output of a full break-in control circuit and deciding its frequency to input it to a CPU. CONSTITUTION:A signal obtained by inverting the transmission/reception decision signal having the break-in frequency from the full break-in control circuit and a receiving power source voltage RX8V are applied to the first AND gate 42A, and an output Y1 which is in the high level only for transmission and a polarity output obtained by rectifying the output of a product detector 26 of a receiving circuit 2 are applied to an NAND gate 44. Consequently, break-in is automatically received with the transmission frequency after keying in case of the break-in transmission frequency.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a full break-in keying wireless telegraph transmitter/receiver that operates using separate transmitting and receiving frequencies, in which the frequency of the break-in signal is changed when there is a break-in during transmission. A function that automatically determines whether the frequency is the transmit frequency or the receive frequency and automatically sets the receive frequency for transmitting path 1 to the frequency of the break-in signal, and a function to restore the set frequency to the regular operating frequency. It concerns a full break-in keying transceiver circuit with full reset functionality.

break-1n key
ing) is a radio tube, which omits the manual operation to switch between the transmitting state and the receiving state, and automatically switches from receiving mode to transmitting mode by pressing down on the telephone key. This is a form of communication in which radio waves are emitted while the key is being pressed, communication is performed using Morse code, etc. when the key is operated, and when the key operation is finished, the mode of communication automatically returns to the receiving state. , there is the convenience of being able to respond immediately to a break-in (interrupt call), and more specifically, it is classified into a full break-in method and a semi-break-in method.

In full break-in keying, the dots and dashes that form the code (called marks) are transmitted at the same time as the key is pressed, and the reception mode is set in the middle of the dots and dashes and the space between characters. It is something to keep.

On the other hand, in semi-break-in keying, the first press of the key enters a transmission state with a hold time constant, and the code is transmitted according to the operation of the key, but no radio waves are emitted during the space period. While the transmit mode is maintained, the receiver circuit stops operating. The trap requires a holding time constant of, for example, 0.5 seconds until it enters the receiving state after the transmission (key operation) is completed. Therefore, there is a risk of missing the beginning of the transmission from the other party, but it is relatively easy to provide a holding time constant for switching between transmission and reception, and it is also convenient to be able to use it in common with the VOX (voice control) circuit for telephone transmission and reception. Therefore, it is often used in relatively inexpensive equipment.

With full break-in keying, the signal is in the receiving state except when the mark is pressed down, so reception can be performed at the same time as the key operation is completed, and there is no need to worry about cutting off the beginning of the signal. In addition, space periods are also received, so
Even if the content of the communication is unknown, it is possible to know that a signal is coming, so it is convenient to stop the telephone key for a moment and check it, which also allows you to respond to emergency break-ins (interrupt communication). It is something. However, such a full
In order to perform a break-in operation, the receiving circuit must remain in an operating state at all times, and switching between transmitting and receiving depends on the operation of the antenna relay, so it is necessary to prevent the transmitted radio waves from entering the receiving circuit at the time of marking and to switch between transmitting and receiving. This requires sophisticated technology such as preventing transients in the circuit during transmission, and it is necessary to use expensive antenna relays such as high-speed reed relays for high-frequency use that can withstand transmission power at high speeds that can handle key operations. This makes it ideal for communication devices that require high performance.
A break-in keying method is used.

There is no problem with single frequency transmission and reception where the transmission and reception are the same frequency, as the break-in frequency is of course the same, but there is no problem with the so-called ssouri, where separate frequencies are used for transmission and reception.
(SpHt) In frequency transmission and reception, the other party will break in at its transmission frequency (our reception frequency), but if the station that intercepts our transmission breaks in, it will break in at the intercepted frequency (our transmission frequency). It is only natural to break in. Therefore, it is impossible to predict whether break-in from another station will occur on the transmit frequency or on the receive frequency, and in order to fully utilize the features of the full fist break-in method, K should be set at the receive frequency as described above. It is necessary to constantly monitor not only break-in detection at the transmission frequency but also break-in at the transmission frequency.

As an invention corresponding to this purpose, there is a patent application No. 123860 of 1982, "Full Plake Inking Method", which was previously filed by the present applicant.The purpose thereof is disclosed in the claims of the specification of the same application. As stated in ``During split operation of wireless communication where the transmitting frequency and the receiving frequency are mutually exclusive, the transmitting frequency and the receiving frequency may be alternated or doubled.
This is a full break-in keying method that uses random reception as t-am, and its feature is that in conventional full break-in keying operation, only break-in at the receiving frequency is detected even during split frequency operation. In addition to being insensitive to break-in at the transmit frequency, the presence of a break-in signal is now reliably detected by receiving the transmit frequency and the receive frequency alternately or randomly during the space interval. There is a detectable K.

Furthermore, the utility model "Full Break-in Keying Circuit" filed by the present applicant on August 29, 1988 is disclosed in the claims of the utility model registration in the specification of the same application.
"During split frequency operation in wireless communications where the transmitting frequency and receiving frequency are different, in the full break-in keying method in which the transmitting frequency and receiving frequency are received alternately or randomly, the frequency of the break-in signal is the transmitting frequency. A directional time constant circuit is provided in the determination signal circuit for determining whether the signal is the received frequency or not, and the leading edge of the keying mark signal has a small delay, and the H after the mark signal is delayed by a predetermined amount. Full break-in characterized by providing a selection changeover switch for a frequency judgment signal that passes through a directional time constant circuit, a frequency judgment signal that does not pass through a directional time constant circuit, and a judgment signal that fixes the frequency judgment signal to transmission.・Keying circuit. By adding some circuits to the conventional full break-in control circuit, it is relatively easy to detect the break-in signal and fix the reception to the frequency of the break-in signal. This is an idea to facilitate response to break-in signals during split frequency operation. However, there is a problem in that it takes some time to respond if you are not used to the operation.

The present invention is a full break-in keying radio transmitter/receiver that operates using separate transmit and receive frequencies, and automatically determines whether the frequency of a break-in signal is the transmit frequency or the receive frequency. A full break-in keying transmitter/receiver circuit equipped with a function to automatically set the receiving frequency at the time of termination to the frequency of the break-in signal, and a reset function to restore the set frequency to the normal operating frequency. If there is a break-in input, the receiving frequency is automatically set to the break-in frequency, so there is a feature that it is possible to immediately respond to the break-in without any special operation.

Before describing embodiments of the present invention, a full break-in
The first example of the configuration of a wireless telecommunication transmitter/receiver circuit using the keying method is as follows.
To briefly explain the drawing, 21 and 23 of the receiving circuit l are signal amplifiers, 22 is a receiving mixer, 24 is an audio amplification stage, and 25
31 is the transmission output stage, which is the main transmitter circuit.
2 is a transmitting mixer, 33 is a transmitting low power stage, 34 is an original oscillator, 3.5 is a 4-domain tone oscillator, and 36 is a side tone buffer amplifier. Switching between transmitting and receiving is done by switching the antenna between the transmitting side and the receiving side using antenna relay 1, but that's just 1! The power source voltage can also be switched between transmitting and receiving, and it is also equipped with control circuits for RX mute and TX mute. This is due to the requirements of preventing transmission power from being fed into the receiving circuit, preventing clicking noises during switching, and shaping the keying waveform.The full break-in control circuit shown in the dashed line at the end creates the necessary timing. There is.

FIG. 2 is a system diagram of frequency settings for a full break-in keying transceiver. The reception frequency is determined by the injection frequency to the reception mixer 22, and the transmission frequency is determined by the injection frequency to the transmission mixer 32. The local oscillator that generates these injection frequencies currently uses a PLL (Phase Locked Loop).
Control VCO (Vol tags Control
d 0scillator) is used, and the frequency of vCO is determined by the PD (Programmable
The frequency data is set by inputting digital value frequency data to the frequency divider. There are various methods to create this frequency data, but in Figure 2, CP
U (Central Processor Unit
) is used.

Since these PLL-CPU and frequency control circuit (the figures are omitted) are not directly related to this application, the explanation will be omitted, but the conversion of the transmitting frequency and receiving frequency required during split frequency operation is a transmitting/receiving judgment that is added to the CPH. This is done depending on whether the signal is at H level or L level. If Figure 3 is applied to the full break-in control circuit surrounded by the thick chain line in the figure, the transmission/reception determination signal applied to CP[J is output from the keying signal through the directional time constant circuit, so the fourth ) as shown in the timing waveform diagram,
In the first half of the key-up reception period, a break-in is detected (received) at the transmission frequency, and in the second half, a frequency determination signal is generated to detect a break-in at the reception frequency. The other circuit parts of the 21st Ei 1 are directly related to the present invention +
I will omit the explanation as the JJ staff is short.

FIG. 5 shows a circuit for automatically determining whether the frequency of the break-in signal according to claims 1 and 2 of the present invention is a transmission frequency or a reception frequency, for example, the circuit shown in FIG. A signal obtained by inverting the transmission/reception determination signal of the break-in frequency of the full break-in control circuit 1 through the inverter 41 and the reception power supply voltage (for example, Rx in FIG.
8 V) and the input A- of the first AND date 42A.
In addition to B, its output Y and product detection 2 of the receiving circuit main
6 is rectified by diode 43 and the positive polarity output is N.
AND)r''-) 440 input A-B, and its output Y is passed through the latch circuit 45 to the second ANDr-to 4.
In addition to the A input of 6, the break-in frequency transmission/reception determination signal from the full break-in control circuit is added to the B input, and the output Y is determined whether the frequency of the break-in signal is the transmission frequency or the reception frequency. This is automatically determined and output as a transmission/reception determination signal. Therefore, in the frequency setting system diagram of FIG. 2, the transmission/reception judgment signal output of the full break-in control circuit is connected to the transmission/reception judgment signal input of FIG. 5, and the transmission judgment signal output of FIG. This adds a function of automatically setting the reception frequency at the end of transmission to the frequency of the break-in signal, as set forth in claim 1 of the present invention, by inputting the frequency to the frequency of the break-in signal.

Next, the operation of the circuit shown in FIG. 5 will be explained with reference to the operation timing waveform diagrams shown in FIGS. 4 and 7.

The transmission/reception determination signal input to the circuit of FIG. 5 is supplied, for example, from the full break-in control circuit of FIG. Figure 3 °
In Table 1 and Table 2, the keying circuit of the keying circuit is a directional time constant circuit in which the change in potential of H-L is enclosed by a chain line, and the resistance Ro and capacitor c.

Since the diode Do is connected in parallel with aO of the time constant circuit, the key-down waveform has no delay, and only the key-up waveform is delayed, which is the transmission/reception determination signal in the timing waveform of FIG.

The transmission/reception determination signal is inverted and applied to the input A of the first AND gate 410 in FIG. 5 through an inverter, and the input B
(A and B may be reversed) is RX8V (reception status °
(H level in the transmitting state, L level in the transmitting state), the output becomes Yl according to the truth table shown in Table 1. That is, A-
Yl is H only when both B are H, and is L in all other cases, so Yl is H only when input B is in the reception state and the transmission/reception determination signal of input A is "transmission". This is shown in FIG. 7 (4). NAND this Yl Dart 4
In addition to input B of 4 (A and B can be reversed), input A
Since the positive polarity output obtained by rectifying the output of the detector 26 of the receiving section 2 with the diode 43 is added to the signal, the signal will be at the AI'iH level if there is a break-in signal, and will be at the L level if there is no break-in signal. Therefore, the frequency of the break-in signal is determined depending on whether A goes to H level when "transmitting" or "receiving" the transmission/reception determination signal, and the truth table for NAND dart is as shown in Table 2. Only when both A and B inputs are II, the output Y2 is L. Ql and all others are H, so
If the L level appears on the output Y2, it is determined that the transmission frequency is present. This is shown in FIG. 7(B). Since this L level output is intermittent, the L level fixed by the ratte 45 is
AND Add to input of 46. A transmission/reception determination signal is applied to the B input, and according to the truth table in Table 1, when determining "transmission", □ is λ regardless of the input power, and the output Y3 is at L level, and the latch output (input to) is When it becomes L, the Y3 output is determined to be the "transmission" frequency even when "reception" is determined, and the break-in signal is received at the transmission frequency when keying is completed. This is shown in FIG. 7(C).

Next, in the case of a break-in of the reception frequency, the H level part of the Y1 output does not occur, so the yl output becomes L as shown in (■) in Figure 79, and the Y2 output regardless of the A input. is also L. Therefore, the Y3 output of the second AND dart 46 has exactly the same shape as the A input, and the normal striped frequency transmitting/receiving operation is performed for receiving at the receiving frequency.

As described above, according to the configuration shown in FIG. 5 described in claim 2, if the break-in is at the receiving frequency, the break-in and communication partner can receive the same frequency after keying is completed (this is normally not the case). If the break-in is on the transmit frequency, the break-in will be automatically received on the transmit frequency after keying is completed, so the response to the break-in can be extremely quick.
After responding to the break-in, it is necessary to return to the communication partner station again. According to claim 3, as described in claim 2, a reset switch 47 is provided in the Te circuit and operated. This disclosure discloses a configuration in which the latch operation is canceled by.

Furthermore, in the circuit example of FIG. 5 described in claim 2, a three-man power AND
Using Dart 42B, as shown in Fig. 6, the signal obtained by inverting the transmission/reception determination signal of the break-in frequency of the full break-in control circuit through the inverter 41 is input to the input A of 42B, and the receiving power supply voltage (for example, RX8V) is connected. In addition to input B, a switch 49 is provided to switch the level of input C between L and H. For example, when VCC at H level is connected to input C through a rainbow resistor 48, the operation of dart 42B is as shown in Table 3. According to the truth table, the output Y is H only when both A and B are H, and the output Y is L in all other combinations. That is, if input C is I-I, input A-
As for H, it is the same as Table 1, so 42B is the 5th table.
It has the same function as 42A in the figure.

Next, when the input C is at the L level, the output Y1 is fixed at the L level regardless of the level of the inputs A-H, and the output Y2 of the NAND (e-) 44 that inputs this is fixed at the L level. In this state, the transmission determination signal input and output of the AND gate 46 have exactly the same waveform, and the automatic setting function is canceled. Therefore, if the switch that connects the input C of the 3AND dart 42B to ground, and the switch 49, is opened (personally set to AUTO), the circuit automatically sets the frequency for the break-in signal. It operates as a normal circuit without any settings, and switching is performed only by manipulating the potential of the DC circuit without touching the signal circuit, so the operation is reliable and has the advantage of not having to worry about noise contamination.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of a full break-in control circuit for a full break-in keying wireless telegraph transceiver. FIG. 2 is a system diagram of the frequency control circuit of a full break-in keying radio transmitter/receiver. Figure 3 is an example of a full break-in control circuit. FIG. 4 is an operation timing waveform diagram of the circuit of FIG. 3. FIG. 5 shows an example of an implementation circuit of the present invention. Figure 6 is a partial circuit diagram. Figure 7 is an operation timing waveform diagram of Figure 5.1.
... Antenna relay, E... Receiving circuit, and... Transmitting circuit, 21, 23... Received signal amplification stage, 22...
Reception mixer stage, 24... Reception audio amplification stage, 25...
Speaker, 26... Product detection stage, 31... Transmission output stage, 32... Transmission mixer stage, 33... Transmission low power stage, 34... Original oscillator, 35... Sidetone oscillator, 36...sidetone amplifier, 41.GO.
・・Innoq-ta, 42A-42B-46-ANDf-
), 43・Do...diode, 44...NAN
D? -G, 45... U, Te, 47, 49... Sui, Te, 48, R (1... Resistor, K... Telephone key, co
...Capacitor. 4th diagram Dimensions A112. -2 Mar 1 ′″′″゛-S Mar 2
'L°°-Person Figure 5

Claims (4)

[Claims] (1) Full-scale operation with separate transmit and receive frequencies
In a break-in keying wireless telecommunication transmitter/receiver, it is automatically determined whether the frequency of the break-in signal is the transmit frequency or the receive frequency, and the receive frequency at the end of transmission is automatically set to the frequency of the break-in signal. 1. A full break-in keying transmitter/receiver circuit, characterized in that it has a reset function for restoring the set frequency to a normal operating frequency. (2) In a full break-in keying radio transmitter/receiver that operates using separate transmit and receive frequencies, the circuit that automatically determines whether the frequency of the break-in signal is the transmit frequency or the receive frequency is fully equipped.・NAND the output obtained by passing the transmission/reception determination signal of the break-in frequency from the break-in control circuit through the inverter and the received power supply voltage through the first AND dart, and the positive polarity output of the received signal. 1- is applied to the second ANII'-) through the latch circuit together with the transmission/reception determination signal of the break-in frequency, and the second AND
A full break-in keying transmitter/receiver circuit according to claim 1, wherein the transmitting/receiving frequency is set using the dirt output. (3) Claims 1 and 2 have a configuration in which the latch circuit according to claim 2 is provided with a reset switch, and the silatch operation is canceled by operating the reset switch. Full break-in keying transceiver circuit as described. (4) A three-man-powered AND dart is used for the first AND dart described in claim 2, and the transmission/reception determination signal of the break-in frequency of the full break-in control circuit is received with a signal inverted through an inverter. In addition to inputting the power supply voltage, by switching the level of the third input between L and H, the break-in signal detection operation and the operation of automatically setting the reception frequency to the break-in signal frequency are selected. A full break-in keying transceiver circuit according to claims 1 and 2.