CN1033724A - Communication receiver - Google Patents

Abstract

One communication system uses continuous tone selective system and decoding unit (18) so that inspection is other and by containing the signal of single continuous tone, reach the signal that obstruction does not contain this single audio frequency.By interrupt selecting a plurality of interruptable connecting lines (35), receiver by individual with the suitable single audio frequency that contains, each connecting line by (if or be cut off just obstruction) control input signals to decoding unit; It is characterized in that astatic multivibrator (52) is added on second group of control input signals on the connecting line (35), so that decoding unit is being sought a single tone and is being sought balance between another single tone at least, when decoding unit passes through a signal, multivibrator is stopped, and makes signal continue to pass through.

Description

Communication receiver

The present invention system is about the communication receiver of a system, and this system comprises a reflector and a plurality of receiver, and wherein this receiver can receive and aim at the signal of itself launching, and this signal is not received by other receivers.

Such as among the UK Patent Application case No.8629861 the communication system of announcement, wherein mention hope can with Information Selection send to one or more received signal persons.In that application case, think and must in each receiver, have a plurality of decoding units, make a received signal person to receive only the information that is sent to itself by a decoding unit; And by another decoding unit, and receive the signal of sharing with other people.Attempted various method to avoid for example launching multiple signal simultaneously, so that allow a plurality of recipients received signal simultaneously owing to the use cost that a plurality of decoding unit was brought and the cost of volume.Although initial expection, this will be subjected to excessive calling and descend.

The invention provides a communication receiver, it uses a continuous tone selective system and a decoding unit so that inspection is not with by containing the signal of single continuous tone, and blocks the signal that does not contain this single tone.By interrupt to select a plurality of interruptable connecting lines make this receiver by individual to be applicable to this single audio frequency, each connecting line transmits and (or blocks, if be cut off) control input signals is to this decoding unit, it is characterized in that at least the second group control input signals being added on this connecting line, seeking a single audio frequency and seeking balance between another single audio frequency at least to cause this decoding unit by an astatic multivibrator (52); Another feature is to work as this decoding unit in a signal, and this multivibrator is stopped under the state.

In decoding unit, this control input signals will o'clock be drawn to another level by an inner set level in the unit, such as ground level.Generally speaking, this is by connecting this connecting line to the ground connection main line, so those do not have interrupted connecting line will pull corresponding ground connection, and making other point be in inner set level.In the simplest form, this multivibrator is alternately between being added in above-mentioned another level and inner set level (approximately) on the connecting line; So that this unit identification is in the interrupted connecting line (this set level provides the effect the same with being interrupted connecting line) of described another level or inner set level.This single tone that can make the connecting line line adapted that is interrupted with all is as a group calls in several tone, because all receivers will respond this tone.Second group of control input signals do not added on the end points of this connecting line away from this unit, can also these signals be added on the end points of contiguous this unit of this connecting line with suitable circuit.If need sub-group calls in several equipment and a group calls in several equipment, this multivibrator will be got the form of a ring counter, a plurality of outputs are selected for connecting line.Apparent and easy to know, with regard to other receivers, the number of group and child group of equipment will reduce the number of indivedual single tones; In addition, it is just longer that receiver cycles through the time that all devices changes, so receiver responds the time that a tone changes and will increase, or the danger of emitting this receiver not respond, to reduce the shut-down operation time of each equipment.

In a preferred embodiment, this multivibrator also is used as the parts of timing device, uses so that this receiver remained in the pattern of an operation within one period scheduled time after finishing a received signal.Then, make this receiver be in the pattern of preparing, the less power of this receiver consumption rate therebetween.

Fig. 1 is the circuit diagram of a receiver integral body; And

Fig. 2 is the calcspar of a tone decoding device.

These figure show a receiver, and it is applicable to a communication system, and wherein this signal comprises an audio component (it is this signal itself) and subaudible tone (sub-andio tones) (making this signal be addressed to indivedual receivers).

See also shown in Figure 1, an amplification circuit piece 11, a Plessey SL6654 for example, receiving inputted signal via the filter on the line 14 12.In order to improve the input sensitivity of this integrated circuit block, preferably utilize one to add oscillator 15.This integrated circuit block is the output signal mixing of this input signal and oscillator 15, and provides the intermediate-freuqncy signal that is approximately 455KHz, and this intermediate-freuqncy signal is exaggerated, and further amplified through an intermediate-frequency filter 16 and be detected into audio frequency.

This audio signal arrives a decoding integrated circuit piece 18 by a filter and direct current decoupling circuit 17, and relevant this integrated circuit is done more detailed explanation with reference to Fig. 2.If this integrated circuit block 18 detects audio signal and suitable subaudible tone, arrives transducer 21 in the earphone by an audio frequency amplifier 20 on the signal online 19, with the voice output of being wished to get to the person that wears the earphone.

The power of this circuit is from a battery component 22, and this battery component can have an induction charging device 23 that links with it, and this power can directly be put on basic circuit 24, and through a switching transistor 25 and other parts of the circuit that arrives.This transistor utilizes a bistable multivibrator 26 and is switched between conducting and not on-state.This bistable multivibrator 26 has an instantaneous effect switch 27, makes this transistor enter conducting state, and has an incoming line 28, makes this transistor enter this nonconducting state.

Fig. 1 also shows integrated circuit block 29,74HC04 for example, and integrated circuit block 30 is 74HC4060 for example, and integrated circuit block 31 74HC393 for example.The major function of these integrated circuit blocks will be done explanation with reference to figure 2.

4MHz clock 32 in integrated circuit block 29 provides a clock pulse sequence to the frequency divider in the integrated circuit block 30 33, and frequency divider 33 produces the pulse train of 1MHz to the ratio expander 34 in the integrated circuit block 18.This integrated circuit block is a continuous audio decoder, for example by the FX335L CTCSS decoder of consumer's microcircuit Co., Ltd (Consumer Microcircuits Ltd.) product, this decoder utilizes interruptable connecting line 35 and is arranged to respond and reaches the wherein a kind of of 38 kinds of subaudible tones.This ratio expander 34 is output as the tone square wave, and this tone square wave is through a low pass filter 36, a band pass filter 37, an amplitude limiter 38, a digit period detector 39 and be fed to an output latch 40. Filter 36 and 37 tuning by program input signal institute, and filter 36 is this tone square wave and the audio signal of coming from circuit 17 relatively, this audio signal also can avoid this integrated circuit block when not having input signal by line 41 to integrated circuit block 18, receives noise and responds (line 41 is represented) as a signal in Fig. 1.This audio signal is also passed through a high pass filter 42 to decay through the tone signal content of an audio switch 43 to line 19.This breech lock 40 is output as representative, and next audio signal comprises a predetermined subaudible tone by circuit 17, but this output has the tendency of vibration.So breech lock 40 by an integrator (also can consult Fig. 1) to a comparator 45, when the signal that is integrated surpass one preset level the time, this comparator 45 produces a signal.The signal that produces is used to drive audio switch 43 to provide signal to line 19 through logic lock 46.The signal that is integrated also is used to produce the signal that representative has been selected, and all elements 34 to 46 in integrated circuit block 18 or therewith integrated circuit block 18 are connected.Reverse buffer amplifier 47 in the signal feed-through integrated circuit block 29 that is integrated providing a reset signal to the frequency divider 48 in the integrated circuit block 30, and provides an inhibit signal to the oscillator in the integrated circuit block 30 49.This oscillator 49 is shown in Figure 1 by a capacitance-resistance networking 50() and dispose, approximately to vibrate under the 4Hz.The output of this oscillator is fed to an edge via a reverse buffer amplifier 51 and triggers bistable multivibrator 52, thereby drives the end points of connecting line 35.So oscillator 49, amplifier 51 and multivibrator form an astatic multivibrator, it provides the signal of 1/4th second duration between two voltage levels, but it can be condensated among the vibration by inhibit signal.One of this voltage level will be such level, under this level, the end points of the connecting line in the ratio expander 34 can be biased among the integrated circuit block 18, so being all connecting lines, its effect can be interrupted, and another voltage level provides a group calls in several condition and indivedual alternative condition respectively no matter whether this connecting line is interrupted and all can works.The output of this oscillator 49 also is fed to frequency divider 48, frequency divider 48 after about 17 minutes, produce a signal via line 28 with the operation multivibrator 26, cause transistor 25 to enter nonconducting state, if unless begin by the initial point of operating again of this oscillator 49 in these 17 minutes, within these 17 minutes, this divider is reset, and frequency divider 49 comprises a counter.

In another embodiment, be grounded at the end points of connecting line 35 away from unit 18, and this multivibrator applies pulse, with the end points process diode ground connection of at least some connecting lines near this unit 18, these diodes block the direct impulse from multivibrator, if omit some diodes, the forward and the negative-going pulse that then will block from this multivibrator arrive this connecting line.This structure can be expanded, and is used to provide collective call, sub-group calls in several and individual calling device, and a ring counter feedthrough one diode network, so that different devices is limited essential subaudible tone.

Because each device takies a kind of subsonics at least and transfers and can cause other subsonics to transfer to lose efficacy, so be provided as group calls in several and sub-group calls in several device is expensive by the number of the subaudible tone that is fit to a group of receivers.If this multivibrator can adopt the pattern of forward and negative sense (ground connection) pulse,, then can reach and save the purpose that subsonics is transferred to guarantee that each device only takies single subsonics and transfers.

Claims (4)

1, a communication receiver uses a continuous tone selective system and a decoding unit (18) so that inspection is not with by containing the signal of single continuous tone, and blocks the signal that does not contain this single tone.By interrupt selecting a plurality of interruptable continuous lines (35), this receiver is by individual this single audio frequency that is applicable to, each connecting line by (or block, if be cut off) control input signals to this decoding unit; It is characterized in that on this connecting line (35), adding second group of control input signals by an astatic multivibrator (52), so that this decoding unit is being sought a single tone and is being sought balance between another single tone at least, another feature is to work as this decoding unit in a signal, and this multivibrator is stopped.

2, a kind of communication receiver according to claim 1 is characterized in that: this replacing property of multivibrator ground will be added to the end points of connecting line away from this unit corresponding to the input signal of the inside set level of decoding unit and corresponding to the input signal of another level.

3, a kind of communication receiver according to claim 1 is characterized in that: this multivibrator is via diode or other spacer assemblys and the ground connection pulse is added on the end points of connecting line near this decoding unit.

4, a kind of communication receiver according to above-mentioned arbitrary claim is characterized in that: this multivibrator also provides at another place of this receiver regularly.

Images