JP2009055548A - Receiver and transceiver - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a receiver and a transceiver including a BPF manufactured with component(s) with a large tolerance capable of performing a stable demodulating operation and stable communications despite the large tolerance of the BPF component(s) by lessening the tolerance of the oscillating frequency and the frequency of the carrier wave. <P>SOLUTION: The arrangement with these receiver and transceiver is equipped with a multiplying/filtering means to make multiplication for reproducing the carrier wave having the prescribed frequency from the received signal in which the prescribed frequency is modulated with information and to allow the multiplied signal to pass through, a frequency dividing means to oscillate with an oscillation frequency composed of a multiplier and a BPF 9 with variable center frequency allowing the frequency-divided signal to pass through and able to control the center frequency, reproducing the carrier wave by subjecting the multiplied signal to frequency dividing, and capable of setting with the center frequency of the BPF 9 in the case the multiplied signal is not fed, and a frequency adjusting means to adjust the oscillation frequency of the frequency dividing means into the frequency of the carrier wave. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a receiver and a transceiver used in a communication system that transmits and receives information using an electric field induced in an electric field transmission medium that transmits an electric field.

  Due to the miniaturization and high performance of portable terminals, wearable computers that can be attached to living bodies have been attracting attention. Conventionally, as information communication between such wearable computers, an electric field communication transceiver is connected and attached to a computer, and an electric field induced by the electric field communication transceiver is transmitted through a living body which is an electric field transmission medium, thereby There has been proposed a method for transmitting and receiving.

  The configuration of the electric field communication system is shown in FIG. Data output from the terminal A 102 and a signal having a predetermined frequency output from the oscillator 105 are modulated by the BPSK method and induced in the communication medium 106. In the receiver 100, the amplification / filter unit 107 removes and amplifies unnecessary components of the signal induced in the communication medium 106, and then regenerates the carrier wave reproduced by the multiplying carrier reproduction unit 112 and the output signal of the amplification / filter unit 107. The demodulated data reproducing unit 108 performs synchronous detection using a mixer to reproduce data. Further, the demodulated data reproducing unit 108 detects the inversion of the synchronously detected data based on the signal obtained by detecting the carrier wave, and corrects and outputs the demodulated data if it is inverted (see Patent Document 1).

  The multiplying carrier recovery unit 112 of the receiver 100 uses a multiplying carrier recovery circuit that once multiplies the frequency of the received signal and divides the frequency to recover the carrier. When the BPSK modulated signal is multiplied, the phase difference between 0 ° and 180 ° becomes 0 ° and 360 °, and the phase difference disappears. When this signal is passed through the multiplication unit 109 and the multiplication signal BPF (band pass filter) unit 110 and then divided by the frequency division unit 111, a continuous carrier wave having no phase change is reproduced.

  Next, FIG. 21 shows the configuration of the frequency divider. When the multiplied signal is input to the input terminal (1), a signal having the same frequency as that of the carrier wave is input to the input terminal (2) that is a signal that has passed through the BPF 115. By multiplying these signals, the multiplied signal is divided and the carrier wave is reproduced.

Further, even if the signal input to the input terminal (1) in the mixer of FIG. 21 is zero, if an offset is applied so as to provide positive feedback in the loop of the mixer output-BPF-amplifier-input terminal 2, the output of the mixer 114-BPF 115 -Amplifier 116-In the loop of the input terminal (2), the signal is transmitted at an oscillation frequency depending on the center frequency of the BPF 115 and the delay time of the loop. When the center frequency of the BPF 115 is adjusted so that the oscillation frequency and the frequency of the carrier wave coincide with each other, when the multiplied signal is input to the input terminal (1), it operates as a frequency divider and the input terminal (1 ) Operates as an oscillator that outputs a carrier wave when the amplitude of the input signal is very small. When the BPSK-modulated signal passes through the amplification / filter unit 107, the amplitude becomes small at the data change point, and the signal that has passed through the multiplication unit 109 / multiplication signal BPF unit 110 at the same location also becomes small. When the signal input to the input terminal (1) is small at the data change point, the output signal amplitude and frequency of the frequency divider 111 are maintained by the operation as an oscillator, and the distortion does not occur at the demodulated data change point and is stable. Communication becomes possible.
JP 2006-81111 A International Publication Number WO2006 / 059684A1, International Publication Date June 8, 2006 NTT

  However, if the tolerance of the parts of the BPF 115 used in the frequency divider 111 is large, the difference between the oscillation frequency and the carrier frequency becomes large, and the above-described operation cannot be expected. Also, if the difference between the carrier frequency and the center frequency of the BPF 115 is large, the signal that is frequency-divided and fed back to the input terminal (2) becomes small, so that the frequency-dividing operation cannot be performed.

  The present invention has been made to solve such problems. The object of the present invention is to reduce the tolerance of the oscillation frequency and the frequency of the carrier wave even when a BPF is manufactured with parts having large tolerances, and to perform stable demodulation operation and It is to provide a receiver and a transceiver capable of communication.

  In order to achieve the above object, the present invention according to claim 1 is a receiver for receiving information by receiving an electric field based on information to be received induced in an electric field transmission medium, wherein A frequency carrier wave is multiplied to regenerate the carrier wave from the received signal modulated with the information, a multiplication / filter means for passing the multiplied signal, a multiplier and a frequency-divided signal are passed, and the center frequency is controlled. A center frequency variable band-pass filter having a center frequency variable band-pass filter that has a possible center frequency variable band-pass filter, reproduces a carrier wave by dividing the multiplied signal, and when the multiplied signal is not input; Frequency dividing means for oscillating at an oscillation frequency that can be set by frequency, frequency adjusting means for adjusting the oscillation frequency of the frequency dividing means to the frequency of a carrier, the received signal and the frequency dividing means And a demodulated data reproducing means for demodulating data based on information from the reproduced carrier output.

  According to a second aspect of the present invention, in the receiver according to the first aspect, the frequency adjusting unit outputs a reference signal having the same frequency as the carrier wave during the adjustment, and the frequency dividing unit. A difference frequency generation means for generating a difference frequency pulse signal having a frequency difference between the output signal of the reference signal and the reference signal, a pulse detection means for detecting the presence or absence of the difference frequency pulse signal having a predetermined time width or less, and A center frequency setting means for outputting a setting signal for setting the center frequency of the center frequency variable bandpass filter, the pulse detecting means is operated by a detection start signal, and the setting signal of the frequency setting means is controlled by a setting control signal. Automatic adjustment for adjusting the oscillation frequency of the frequency dividing means to the frequency of the reference signal based on the upper limit and lower limit of a set value from which a difference frequency pulse signal having a predetermined time width or more is obtained It includes a control processing unit, a.

  According to a third aspect of the present invention, in the receiver according to the first aspect, the frequency adjusting means supplies a reference signal having the same frequency as the carrier wave and an output signal of the frequency dividing means to the demodulated data reproducing means. The difference frequency pulse signal obtained by input is used to adjust the oscillation frequency of the frequency dividing means to the frequency of the carrier wave, the reference signal is input to the demodulated data reproducing means at the time of adjustment, and the received signal is demodulated at the time of reception Demodulation / adjustment switching means for inputting to the data reproduction means, and demodulation connection means for disconnecting the frequency divider and the multiplication / filter means at the time of adjustment and connecting at the time of reception.

  According to a fourth aspect of the present invention, there is provided the receiver according to the third aspect, wherein the frequency adjusting unit outputs a reference signal having the same frequency as the carrier wave at the time of adjustment, and a predetermined time width. The following pulse detection means for detecting the presence or absence of the difference frequency pulse signal, center frequency setting means for outputting a setting signal for setting the center frequency of the center frequency variable bandpass filter, and the pulse detection means by a detection start signal Control the setting signal of the frequency setting means by the setting control signal, and set the oscillation frequency of the frequency dividing means based on the upper limit and the lower limit of the setting value at which a difference frequency pulse signal having a predetermined time width or more is obtained. An automatic adjustment control processing unit for adjusting to the frequency of the reference signal.

  The present invention according to claim 5 is the receiver according to any one of claims 2 to 4, wherein the automatic adjustment control means stores the set value, and a setting signal is sent to the center frequency setting means. Setting value storage means for outputting, lower limit setting value storage means for storing a lower limit of a setting value for obtaining a difference frequency pulse signal having a predetermined time width or more, and setting value for obtaining a difference frequency pulse signal having a predetermined time width or more An upper limit set value storage means for storing the upper limit of the set value; an averaging means for outputting an adjustment signal obtained by averaging the upper limit and lower limit of the set value to the setting storage means; Control is performed to store the upper limit and lower limit of the set value at which a difference frequency pulse signal having a time width or more is obtained in the upper limit set value storage unit and the lower limit set value storage unit, respectively, and the adjustment value is stored in the setting storage unit. Control to perform control It includes a physical means.

  The present invention according to claim 6 is the receiver according to any one of claims 2 to 4, wherein the automatic adjustment control means sequentially switches and stores the setting values by a setting storage control signal, The set value storage means for outputting a set signal to the center frequency setting means, and the same set value as the set value storage means are stored up to the lower limit of the set value at which a difference frequency pulse signal having a predetermined time width or more is obtained, An increment variable counter means for outputting to the setting storage means an adjustment value obtained by adding half the set value between the lower limit and the upper limit of the set value from which a difference frequency pulse signal having a time width or more is obtained; and the set value storage The set value of the means is controlled so that the increment value variable counter means stores the same set value as the set value storage means until a lower limit of the set value is obtained at which a difference frequency pulse signal having a predetermined time width or more is obtained. The given An increase number control signal that halves the set value between the lower limit and the upper limit of the set value from which a difference frequency pulse signal that is greater than or equal to the interval width is obtained, and controls to store the adjustment value in the setting storage means Control processing means.

  The present invention according to claim 7 is a receiver for receiving information by receiving an electric field based on information to be received induced in an electric field transmission medium, wherein a carrier wave having a predetermined frequency is modulated with the information. Multiplication / filter means for multiplying the carrier wave from the received signal and passing the multiplied signal; a center frequency variable bandpass filter capable of passing the frequency-divided signal and controlling the center frequency; The carrier signal is recovered by dividing the multiplied signal, and oscillates at an oscillation frequency that can be set by the center frequency of the center frequency variable bandpass filter when the multiplied signal is not input. A frequency dividing means that adjusts the oscillation frequency of the frequency dividing means to the frequency of the carrier wave during adjustment, and during the monitoring, the oscillation frequency of the frequency dividing means and the frequency of the carrier wave of the received signal A frequency monitoring / adjusting means for comparing and monitoring the difference between the received signal and the output signal of the frequency dividing means during monitoring, and the reproduced carrier wave output from the received signal and the frequency dividing means during reception. The demodulated data reproducing means for demodulating data based on the information, the multiplication / filter means and the frequency dividing means are disconnected at the time of adjustment and frequency monitoring, and the frequency dividing means is connected when demodulating the data based on the information Carrier reproduction connection means for outputting a carrier wave reproduced from the means.

  The present invention described in claim 8 is the receiver according to claim 7, wherein the frequency monitoring / adjusting means outputs a reference signal having the same frequency as that of the carrier wave at the time of adjustment; A difference frequency generating means for generating a difference frequency pulse signal whose frequency is the difference frequency between the output signal of the circumference means and the reference signal; a difference frequency pulse signal output from the difference frequency generating means; and a demodulated data reproducing means Inputs the output difference frequency pulse signal, outputs the difference frequency pulse signal output from the difference frequency generation means during adjustment, and outputs the difference frequency pulse signal output from the demodulated data reproduction means during monitoring Means, a pulse detecting means for detecting the presence or absence of the difference frequency pulse signal having a predetermined time width or less, and a setting signal for setting the center frequency of the center frequency variable bandpass filter. A center frequency setting means that operates, the pulse detection means is operated by a detection start signal, and the setting signal of the frequency setting means is controlled by a setting control signal to obtain a difference frequency pulse signal having a predetermined time width or more. Automatic adjustment control processing means for adjusting the oscillation frequency of the frequency dividing means to the frequency of the reference signal based on an upper limit and a lower limit of the value.

  According to a ninth aspect of the present invention, in the receiver according to the seventh aspect, the demodulated data reproducing means generates a difference frequency from a reference signal having the same frequency as the carrier wave and an output signal of the frequency dividing means at the time of adjustment. A pulse signal is generated, a difference frequency pulse signal is generated from the received signal and the output signal of the frequency dividing means at the time of monitoring, and data based on information is received from the received signal and the reproduced carrier wave output from the frequency dividing means at the time of reception. The frequency monitoring / adjusting means performs a demodulation operation, and at the time of adjustment, a difference frequency pulse signal obtained by inputting a reference signal having the same frequency as the carrier wave and an output signal of the frequency dividing means to the demodulated data reproducing means. And adjusting the oscillation frequency of the frequency dividing means to the frequency of the carrier wave, and at the time of monitoring, the difference frequency path obtained by inputting the received signal and the output signal of the frequency dividing means to the demodulated data reproducing means. The reference signal is input to the demodulated data reproduction means at the time of adjustment, and the demodulation / adjustment switching means for inputting the received signal to the demodulated data reproduction means at the time of adjustment, and the division at the time of adjustment. And a demodulation connection means for disconnecting the peripheral portion and the multiplication / filter means and connecting them at the time of reception.

  A tenth aspect of the present invention is the receiver according to any one of the seventh to ninth aspects, wherein the automatic adjustment control means stores the set value and sends a setting signal to the center frequency setting means. Setting value storage means for outputting, lower limit setting value storage means for storing a lower limit of a setting value for obtaining a difference frequency pulse signal having a predetermined time width or more, and setting value for obtaining a difference frequency pulse signal having a predetermined time width or more An upper limit set value storage means for storing the upper limit of the set value, an averaging means for outputting an adjustment signal obtained by averaging the upper limit and lower limit of the set value to the set value storage means, and at the time of adjustment, the set value of the set value storage means is controlled. The upper limit and lower limit of the set value for obtaining a difference frequency pulse signal having a predetermined time width or more are controlled to be stored in the upper limit set value storage means and the lower limit set value storage means, respectively, and the adjustment value is stored in the setting memory. Memorize in the means And controls, at the time of receiving and a control processing means for outputting a frequency error signal when a predetermined time width or less of the difference frequency pulse signal is detected in the pulse detection unit.

  The present invention according to claim 11 is the receiver according to any one of claims 7 to 9, wherein the automatic adjustment control means sequentially switches and stores the setting values by a setting storage control signal, A setting value storage means for outputting a setting signal to a center frequency setting means, and a setting for storing the same setting value as the setting value storage means up to a lower limit of the setting value for obtaining the detection end signal and obtaining the detection end signal An increase number variable counter unit that outputs an adjustment value obtained by adding a half of a setting value between a lower limit value and an upper limit value to the setting storage unit, and at the time of adjustment, controls a setting value of the setting value storage unit, Until the lower limit of the set value at which a difference frequency pulse signal with a predetermined time width or more is obtained, the increase number variable counter means stores the same set value as the set value storage means, and the difference frequency with a predetermined time width or more is stored. Pal Outputs an increase number control signal that halves a set value between a lower limit and an upper limit of a set value from which a signal can be obtained, and performs control to store the adjustment value in the setting storage means, and at the time of reception the pulse detection means Control processing means for outputting a frequency error signal when the detection end signal is input from.

  A twelfth aspect of the present invention is the receiver according to any one of the first to eleventh aspects, wherein the pulse detecting means includes a timer means for measuring a predetermined time, and within a predetermined time. It is characterized in that both the rising and falling edges of the difference frequency pulse signal are detected, the presence / absence of a difference frequency pulse signal having a predetermined time width or less is determined, and a signal indicating the determination result is output.

  A thirteenth aspect of the present invention is the receiver according to any one of the first to twelfth aspects of the present invention, wherein the timer means measures the time when the rising or falling edge of the difference frequency pulse signal is detected. It is clear and re-timed.

  The present invention according to claim 14 is the receiver according to any one of claims 1 to 13, wherein the difference frequency generating means is orthogonal to the in-phase component of the output signal of the frequency dividing means and the reference signal. A difference frequency pulse signal having a frequency difference between the components is generated, and a detection signal is output when a pulse width of each difference frequency pulse signal generated from the in-phase component and the quadrature component is equal to or longer than a predetermined time, Pulse detecting means for outputting a detection period end signal when the time is equal to or shorter than a predetermined time.

  The invention according to claim 15 is the receiver according to any one of claims 1 to 14, and modulates and transmits the information to be transmitted to the modulated signal using the carrier wave of the predetermined frequency. And a transmitter that transmits only a carrier wave in a predetermined period immediately before output.

  According to the present invention, it is possible to provide a receiver and a transceiver capable of reducing the tolerance between the oscillation frequency and the frequency of the carrier wave and performing stable demodulation operation and communication even when a BPF is manufactured with parts having large tolerances.

<First Embodiment>
FIG. 1 shows a first configuration example of the first embodiment according to the present invention.

  In FIG. 1, only the periphery of the frequency divider 7 is shown. A center frequency variable BPF 9 capable of changing the center frequency is used for the BPF (band pass filter) of the frequency divider 7. Further, the automatic frequency adjusting unit 1 that adjusts the oscillation frequency of the frequency dividing unit 7 is used. The automatic frequency adjustment unit 1 compares the oscillation frequency and the reference frequency equal to the carrier frequency while changing the set value of the center frequency of the center frequency variable BPF 9, and sets the set value of the center frequency at which the oscillation frequency matches the reference frequency. Explore. For comparison between the oscillation frequency and the reference frequency, a method is used in which the period of the difference frequency signal generated by the mixer (multiplier) 8 is observed.

  FIG. 2 shows the relationship between the period of the difference frequency signal and the oscillation frequency. When the oscillation frequency approaches the frequency of the reference signal, the period of the difference frequency signal becomes longer, and when it coincides, it becomes infinite. Since the adjustment time becomes very long when observed until the period of the difference frequency signal becomes longer, in this embodiment, the optimum value is set from the upper limit and the lower limit of the set value of the center frequency at which the half period of the difference frequency signal is equal to or longer than the predetermined time. Find the setting value.

  In this configuration, the center frequency of the center frequency variable BPF 9 is set by a setting signal from the center frequency setting unit 2 that operates based on the set value control signal from the automatic adjustment control processing unit 3. After setting the center frequency, the reference signal from the reference signal source 5 and the output signal of the frequency divider 7 are multiplied, filtered, and binarized by the difference frequency generating mixer 6, and the difference frequency pulse signal of both signals is obtained. A difference frequency pulse signal is generated.

  The pulse detector 4 outputs a detection signal when both the rising edge and falling edge of the difference frequency pulse signal are detected within a predetermined time after the detection start signal is input, and outputs a detection period end signal when it is not detected. The predetermined time is measured by a timer in the pulse detector 4. This pulse detector 4 determines only whether the pulse width of the difference frequency pulse signal is greater than or equal to a predetermined time. The above processing is performed while sequentially changing the set value of the center frequency, and the upper limit and the lower limit of the set value at which the pulse width becomes a predetermined time or more are obtained. After this, the upper and lower limits are averaged and the center frequency is set as the adjustment value. Detailed operation will be described below.

  Next, FIG. 3 shows a configuration example of the automatic adjustment control processing unit 3.

  First, the operation of each part will be described. The control processing circuit 12 performs control processing for automatic frequency adjustment, and initializes, activates and controls each unit and circuit. In the pulse detection operation, after a set value control signal, which will be described later, is output, a detection start signal is output to the pulse detector 4, and a detection period end signal or a detection signal is awaited.

  When a detection period end signal is input, the current set value is stored in the lower limit or upper limit set value storage area (upper limit set value storage circuit 16 and lower limit set value storage circuit 17), and then the next set value is set. Perform the process. When a detection signal is input, processing for setting the next set value is performed. Regardless of whether the detection period end signal or the detection signal is input, the output of the detection start signal is stopped, the operation of the pulse detector 4 is stopped, and the internal state is cleared. When the setting range upper limit signal is input from the setting storage circuit 13, the adjustment value of the averaging circuit 15 is stored in the setting storage circuit 13.

  The setting storage circuit 13 stores the set value of the center frequency and outputs a set value control signal for setting the center frequency according to the set value to the center frequency setting unit 2. At the start of processing, the set value is initialized by the set value storage circuit control signal from the control processing circuit 12, and then the set value is sequentially increased and set according to the set value every time the set value storage circuit control signal is input. Outputs a value control signal.

  When the set value reaches the set range upper limit, the set range upper limit signal is output to the control processing circuit 12, the adjustment value from the averaging circuit 15 is stored, and the set value control signal is output. The lower limit set value storage circuit 17 and the upper limit set value storage circuit 16 store the lower limit and the upper limit of the set value whose pulse width is longer than the detection period, respectively, and the write switching circuit 14 selects an area for storing the set value. The averaging circuit 15 averages the upper limit set value and the lower limit set value and outputs the result as an adjustment value to the setting storage circuit 13.

  FIG. 4 shows a flowchart for explaining the operation. When an adjustment start signal is input from the reception circuit controller 11 that controls the operating state of the receiver, each part of the automatic frequency adjustment unit 1 is initialized, a reference signal activation signal is output, and the reference signal source 5 is activated ( S1). A detection start signal is output from the control processing circuit 12, and the pulse detection operation of the pulse detector 4 is started (S2). When a pulse is detected during the detection period and a detection signal is input (S3, S4), the pulse detection unit 4 is stopped and cleared (S8).

  On the other hand, if a detection period end signal is input without detecting a pulse and the lower limit set value has not yet been detected, the current set value is stored in the lower limit set value storage circuit 17 and the upper limit set value storage circuit 16. (S5, S6). If already detected, the write switching circuit 14 is switched and the current set value is stored in the upper limit set value storage circuit 16 (S5, S7).

  Thereafter, the pulse detector 4 is stopped and cleared (S8). If the set value does not reach the upper limit of the set range, the next set value is set and the same operation is repeated (S9, S10). When the set value is increased and no pulse is detected, the set value is overwritten in the upper limit set value storage circuit 16. When the set value reaches the upper limit of the set range, a set value obtained by averaging the upper limit set value and the lower limit set value is output as an adjustment value to the center frequency setting unit 2, and the center frequency of the center frequency variable BPF 9 is set. Thereafter, a completion signal is output to the receiving circuit controller 11 (S9, S11).

  In the above description, the setting value is sequentially changed at the time of adjustment. However, the adjustment value may be obtained by increasing or decreasing by two. In this case, it is only required to add the upper limit and the lower limit instead of averaging, and the time for changing the set value to the upper limit is shortened.

  By performing the frequency automatic adjustment operation described above at the time of receiver activation or the like, the tolerance of the oscillation frequency and the frequency of the carrier wave can be reduced, and a receiver capable of stable demodulation operation and communication can be provided. In the above description, the set value is sequentially increased at the time of frequency adjustment, but may be decreased sequentially. In addition, in order to perform the pulse detection operation after the oscillation frequency of the frequency divider 7 is stabilized by changing the setting of the center frequency, the pulse detector 4 is used for measuring the detection period after a predetermined time has elapsed after the detection start signal is input. The timer may be started. In this case, the detection of the rising and falling edges of the difference frequency pulse signal is started at the same time or after the start of the detection period timing timer. Further, in order to confirm that the adjustment value is appropriate, after the adjustment value is set, a pulse detection operation may be performed once again to confirm that no pulse is detected (not shown).

  Furthermore, in the above description, a detection signal is output when the pulse width of the difference frequency pulse signal is equal to or shorter than a predetermined time, and a detection period end signal is output in other cases. When the difference frequency pulse signal is detected, a detection signal may be output when the detection period end signal is output. A control flow in this case is shown in FIG. After the detection period end signal is input, the presence / absence of the detection signal is determined (S34). If there is no detection signal, the current set value is stored in the lower limit or upper limit set value storage area (S35, S36), and the next setting is made. Process to set the value. If there is a detection signal, the pulse detector is stopped and cleared (S37), and if the set value has not reached the upper limit of the set range, the next set value is set (S39). The detection signal may be output when a short difference frequency pulse signal is not detected in the sense that a long difference frequency pulse signal is detected. The control flow in this case proceeds to S34 when there is a detection signal in S33 (Yes), and proceeds to S37 when there is no detection signal.

  Since the difference frequency pulse signal and the detection start signal are not synchronized, the detection signal may not be output accurately when the detection period and the pulse width of the difference frequency pulse signal become approximately the same in the pulse detection operation. Detailed description and countermeasures in this case will be described below with reference to FIG. Consider a case where the timer is started at the timing shown in FIG. 6 in a state where the detection period in the timer setting in the pulse detector 4 is slightly longer than the pulse width of the difference frequency pulse signal. Since only the falling edge is detected in the detection period in the timer setting, the detection signal is not output. In order to accurately detect the pulse, when the rising or falling edge of the difference frequency pulse signal is detected (in FIG. 6, the falling is detected), the timer is once cleared and restarted to detect the pulse. By this processing, the start timing of the timer and the difference frequency pulse signal are synchronized, and the accuracy of pulse detection is improved.

  FIG. 7 shows a second configuration example of the automatic frequency adjustment unit 1. Even if the frequency of the output signal of the frequency divider 7 and the frequency of the reference signal match, if the phase of both is shifted by about 90 °, the output of the multiplication result of the difference frequency generating mixer becomes an intermediate potential. When this output is binarized, a random pulse is output due to the influence of circuit noise, and a detection signal may be erroneously output. As a countermeasure, in FIG. 7, the difference frequency generation mixer is an orthogonal mixer, and the pulse detection unit is duplicated. The reference signal is input as it is to one of the difference frequency generating quadrature mixers 20, and the phase is shifted by 90 ° to the other. In this configuration, even if the phase is shifted by 90 ° (or an integer multiple of 90 °) on the one hand, it can be confirmed whether the frequency is exactly the same by observing the other difference frequency pulse output signal.

  In the double pulse detector 21, the logical product is taken for each detection signal output when a pulse is detected, and each detection period end signal outputted when no pulse is detected in the detection period. The logical sum is taken and output to the automatic adjustment control processing unit 3. This configuration enables accurate pulse detection.

FIG. 8 shows a second configuration example of the automatic adjustment control processing unit 3. In this configuration example, the circuit for storing the upper limit and lower limit set values and the averaging circuit are deleted, and the set value is sequentially changed and the adjustment value is obtained. Since the memory circuit and the averaging circuit, which is a multi-bit operation, can be reduced, the number of circuit wirings can be reduced. If the upper limit and lower limit set values are k _u and k _l , respectively, and the adjustment value is k _adj , the following equations hold.

_{k adj = (k u + k} l) / 2 (1)
In addition, when the number of set values in which no pulses are detected from the lower limit k _l that is a set value when no pulse is first detected (a detection period end signal is input) is w, the upper limit is ku = k _l + w. . Therefore, equation (1) is transformed into the following equation.

k _adj = k _l + w / 2 (2)
From equation (2), the adjustment value can also be obtained from the number of set values in which no pulse is detected after the lower limit is found. In the increase number variable counter 22 of FIG. 8, the lower limit is stored by counting at the same increase number as the setting storage circuit 13 until the set value at which no pulse is detected, and the increase number is halved from the set value at which the pulse is not detected the second time. To count the number of set values for which no pulse is detected. Thereafter, an operation of outputting the adjustment value to the setting storage circuit 13 is performed.

  FIG. 9 shows a control flow. When an adjustment start signal is input from the reception circuit controller 11 that controls the operating state of the receiver, each part of the automatic frequency adjustment unit 1 is initialized, a reference signal activation signal is output, and the reference signal source 5 is activated ( S20). A detection start signal is output from the control processing circuit 12 to start the pulse detection operation of the pulse detector 4 (S21). When a pulse is detected during the detection period (S23) and a detection signal is input, the pulse detector 4 is stopped and cleared (S28). First, until the detection period end signal is input without detecting a pulse, the lower limit is stored by counting with the same increment as the setting storage circuit 13 (S27). When the detection period end signal is input for the second time or later (S24), the increase number is halved and counted (S26). Thereafter, the pulse detector 4 is stopped and cleared (S28).

  If the set value does not reach the upper limit of the set range, the next set value is set and the same operation is repeated (S30). When the set value reaches the upper limit of the set range, a set value obtained by averaging the upper limit set value and the lower limit set value is output as an adjustment value to the center frequency setting unit 2, and the center frequency of the center frequency variable BPF 9 is set. Thereafter, a completion signal is output to the receiving circuit controller 11 (S31). Also in the present configuration example, a detection period end signal is output when a predetermined time elapses or a short difference frequency pulse signal is detected as in the control flow of FIG. 5, and when a difference frequency pulse signal is detected, a detection signal is detected. May be output.

  FIG. 10 shows a modification of the first embodiment, and FIG. 11 shows a detailed configuration of the frequency automatic adjustment unit 1 in the modification. In this embodiment, the synchronous detection unit in the demodulated data reproduction unit 24 is used to generate a difference frequency pulse signal between the reference signal and the output signal of the frequency division unit 7. A mixer is used for the synchronous detection unit in the demodulated data reproduction unit 24. At the time of demodulation, the received signal is amplified and filtered. The output signal of the filter unit and the reproduced carrier wave are synchronously detected (multiplied), filtered, and binary. To demodulate data. This process is the same as the difference frequency generating mixer in FIG. 1, and a difference frequency pulse signal is obtained when the reference signal and the output signal of the frequency divider 7 are input to the synchronous detector in the demodulated data reproducing unit.

  At the time of frequency adjustment, the reference signal is connected to the demodulation / adjustment switch SWs a1 and c1 for the synchronous detection unit in the demodulated data reproduction unit 24 so that a signal obtained by multiplying the reference signal is not input to the frequency division unit 7. The demodulation SW is turned off. The automatic frequency adjustment unit 1 does not require a mixer, and inputs the difference frequency pulse signal from the demodulated data reproduction unit to the pulse detection unit 4. Other operations relating to the frequency adjustment are the same as those in the first embodiment.

  At the time of demodulation, a1 and c1 of the demodulation / adjustment switch SW23 are connected, and the output signal of the amplification / filter unit is input to the demodulated data reproduction unit 24. Further, the demodulation SW 27 is turned on and the amplified output signal of the amplification / filter unit is input to the frequency dividing unit 7 to reproduce the carrier wave. By performing the automatic frequency adjustment operation of the present embodiment at the time of receiver activation or the like, the tolerance of the frequency of the output signal of the frequency divider 7 and the frequency of the carrier wave is reduced, and a receiver that enables stable demodulation operation and communication Can provide. In FIG. 10, the demodulation / adjustment switch SW is connected to the subsequent stage of the amplification / filter unit, but may be connected to the previous stage.

  FIG. 12 shows a second configuration example of the first embodiment in FIG. In the figure, the automatic adjustment processing unit is mounted in the program of the microcontroller 34 that controls the receiving circuit. In this case, since the form of the signal output from the microcontroller 34 and the input signal of the center frequency setting unit 2 may be different, the set value control signal interface unit 31 is used to connect them. When the microcontroller 34 has a timer function, the microcontroller 34 may perform a timer that measures the detection period of the pulse detection operation. In this case, the pulse detector 4 only detects the rising and falling edges of the difference frequency pulse signal and outputs the detection signal, and the detection period end signal is unnecessary.

<Second Embodiment>
FIG. 13 shows the overall configuration of the second embodiment according to the present invention, and FIG. 14 shows the configuration of the frequency automatic adjustment unit 1 with frequency monitoring.

  Even if the frequency of the frequency divider output signal is adjusted at the time of start-up, the constant of the component may change due to a change in ambient temperature, and the frequency may drift. When a BPF is configured with an inexpensive inductor and capacitance, the sensitivity of the center frequency of the BPF with respect to a temperature change and a change with time increases, and the frequency drift becomes remarkable. When the difference between the frequency of the carrier wave and the frequency of the output signal of the frequency divider 7 becomes large, the loss of the carrier wave in the BPF in the frequency divider 7 becomes large and the frequency dividing operation cannot be performed. This embodiment has a function of not only automatically adjusting the frequency of the frequency divider output signal but also monitoring the frequency. When the drift is confirmed, the receiver circuit controller 11 is notified and readjustment is performed. The automatic frequency adjustment operation is the same as that of the first embodiment. At the time of frequency adjustment, the selector unit 36 inputs the output of the difference frequency detection mixer 30 to the pulse detection unit 4.

  At the time of demodulation, switching is performed by a selector switching signal, and the demodulated data reproducing unit difference frequency pulse signal is input to the pulse detecting unit 4. FIG. 15 shows a timing chart of processing performed by the transmitter and the receiver. The transmitter outputs the carrier wave without modulation at the beginning of the packet, and modulates the carrier wave with data after a certain time W. When the receiver receives the carrier wave, the carrier wave detection signal output from the demodulated data reproduction unit is input to the frequency automatic adjustment unit 1 with frequency monitoring, and the frequency monitoring operation is performed. In FIG. 15, it is performed during the pulse detection period and the illustrated period.

  When the carrier wave recovery SW 32 is turned off, a signal obtained by passing the received carrier wave through the amplification / filter unit and the output signal of the frequency divider unit 7 are input to the demodulated data reproduction unit. A pulse signal is output. Since the pulse width of the difference frequency pulse signal is inversely proportional to the difference between the frequency of the carrier wave and the frequency of the output signal of the frequency divider 7, the frequency difference can be restricted by the length of the pulse detection period.

  A pulse detection period is set based on a frequency difference that can be used to divide the frequency-multiplied signal of the carrier wave. If there is no detection signal from the pulse detector 4, the received packet data can be demodulated. When the detection signal is not output, the carrier wave regeneration SW 32 is turned on by the reproduction start signal after the detection period to start the carrier wave regeneration and demodulate. When a detection signal is output from the pulse detector 4, a frequency error signal is output to the receiving circuit controller 11, and reception is stopped to prompt readjustment.

  FIG. 16 shows a second configuration example of the second embodiment. Even if the frequency of the received carrier and the frequency divider 7 output signal match, if the phase of both is shifted by about 90 °, the synchronously detected (multiplied) output may be an intermediate potential. When this output is binarized, random pulses are output due to the influence of circuit noise, and a frequency error signal may be output erroneously.

  As a countermeasure, in the configuration of FIG. 16, the synchronous detection (multiplication) / filter / binarization of the demodulated data reproducing unit is binarized so that the synchronous detection unit (1) 38, the synchronous detection unit (2) 39, and 90 ° and a phase shifter 37 are provided. On one side, the output signal of the amplification filter unit is input as it is, and on the other side, the phase at the frequency of the carrier wave is shifted by 90 ° by the phase shifter 37 and input. In this configuration, even if the phase is shifted by 90 ° (or an integer multiple of 90 °) on the one hand, it can be confirmed whether the frequency is exactly the same by observing the other difference frequency pulse output signal.

  Next, FIG. 17 shows a configuration of the frequency automatic adjustment unit 1 with frequency monitoring in FIG. The pulse detection unit 4 is duplicated to form a double pulse detection unit 21. At the time of frequency monitoring, the difference frequency pulse signal of the synchronous detection unit 1 is observed on one side, and the difference frequency pulse signal of the synchronous detection unit 2 is observed on the other side. . Automatic adjustment / monitoring control is performed for each detection signal output when a pulse is detected, and for each detection period end signal output when no pulse is detected during the detection period. To the output.

  When the frequency of the received carrier wave is different from the frequency of the output signal of the frequency divider 7, the detection signal is output from both of the double pulse detectors 21, so the operation is the same as the configuration of FIG. 14. In the case where the frequency of the received carrier and the output signal of the divider 7 match, even if the phase of the received carrier and the output signal of the divider 7 is shifted by 90 °, whichever of the duplex pulse detector 21 Since the detection period end signal is output from either of them, it is possible to accurately determine whether the frequencies match or not.

  Similarly to the first embodiment, in the second embodiment, the demodulated data reproduction unit 24 can generate a difference frequency pulse signal. FIG. 18 shows a modification of the second embodiment. At the time of frequency adjustment, a1 and c1 of the demodulation / adjustment switch SW23 are connected to input the reference signal to the demodulated data reproducing unit, and at the time of frequency monitoring and demodulation, a1 and c1 of the demodulation / adjustment switch SW23 are connected. Then, the output signal of the amplification / filter unit is input to the demodulated data reproduction unit 24. The automatic frequency adjusting unit with frequency monitoring 33 in this modification does not use a mixer that generates a difference frequency pulse signal, but inputs the difference frequency pulse signal obtained by the demodulated data reproduction unit 24 to the pulse detection unit. A configuration using the microcontroller 34 shown in FIG. 12 is also possible (not shown).

  In addition, a transceiver can be configured by combining a transmitter with the above configuration. FIG. 19 shows the configuration of the transceiver. In the transceiver, signals are input / output between the transmission / reception controller 42 for switching the transmission / reception unit and the frequency automatic adjustment unit 1. Transmission / reception switching is performed by a transmission / reception switching SW.

  FIG. 20 shows a second configuration of the transceiver. In electric field communication, the signal strength is higher than the output of the transmitter using the variable reactance inserted in the transmitter output of the transceiver and the resonance between the living body and the earth ground and the stray capacitance between the transmitter circuit ground and the earth ground and the living body. A method of efficiently inducing an electric field to a living body by increasing Since the output signal of the variable reactance 45 may have a voltage value higher than the power supply voltage, the input to the receiver in this case is connected to the transmission / reception switching SW 46 provided in the transmission unit 44.

It is a figure which shows the 1st structural example of 1st Embodiment of the transmitter which concerns on this invention. It is a figure which shows the relationship between the period of a difference frequency signal, and an oscillation frequency. It is a figure which shows the structural example of an automatic adjustment part. It is a figure explaining the control flow of automatic adjustment. The control flowchart of automatic adjustment is shown. It is a figure explaining the synchronization of a difference frequency pulse signal and a timer. It is a figure which shows the 2nd structural example of a frequency automatic adjustment part. It is a figure which shows the 2nd structural example of an automatic adjustment control part. It is a figure explaining the control flow in the automatic adjustment control part 2nd structural example. It is a figure which shows the modification of 1st Embodiment. It is a figure which shows the detail of the frequency automatic adjustment part of FIG. It is a figure which shows the 2nd structural example of 1st Embodiment. It is a figure which shows 2nd Embodiment of the transmitter which concerns on this invention. It is a figure which shows the structure of the frequency automatic adjustment part with frequency monitoring in 2nd Embodiment. It is a timing chart explaining the processing timing of the transmitter and the receiver in 2nd Embodiment. It is a figure which shows the 2nd structural example of 2nd Embodiment. It is a figure which shows the detail of the frequency automatic adjustment part with frequency monitoring of FIG. It is a figure which shows the modification of 2nd Embodiment. It is a figure which shows the structure of a transceiver. It is a figure which shows the 2nd structure of a transceiver. It is a figure which shows the structure of the conventional receiver. It is a figure showing the structure of the conventional frequency divider.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Frequency automatic adjustment part 2 ... Center frequency setting part 3 ... Automatic adjustment control processing part 4 ... Pulse detection part 5 ... Reference signal source 6 ... Mixer for difference frequency generation 7 ... Dividing part 8 ... Mixer 9 ... Center frequency variable BPF
DESCRIPTION OF SYMBOLS 10 ... Amplifier 11 ... Reception circuit controller 12 ... Control processing circuit 13 ... Setting memory circuit 14 ... Write switching circuit 15 ... Average circuit 16 ... Upper limit setting value memory circuit 17 ... Lower limit setting value memory circuit 20 ... Orthogonal mixer 21 for generating a difference frequency ... Duplex pulse detector 22 ... Increase number variable counter 23 ... Demodulation / adjustment switch SW
24: Demodulated data reproduction unit 24
25 ... Multiplication unit 26 ... Multiplication signal BPF unit 27 ... Demodulation SW

Claims (15)

A receiver for receiving information by receiving an electric field based on information to be received induced in an electric field transmission medium,
Multiplication / filter means for multiplying a carrier wave of a predetermined frequency from the received signal modulated with the information to regenerate the carrier wave, and passing the multiplied signal;
It has a center frequency variable band-pass filter that allows the center frequency to be controlled by passing the frequency-divided signal with the multiplier, regenerates the carrier wave by frequency-dividing the multiplied signal, and the multiplied signal is input Frequency dividing means that oscillates at an oscillation frequency that can be set at the center frequency of the center frequency variable bandpass filter if not,
Frequency adjusting means for adjusting the oscillation frequency of the frequency dividing means to the frequency of a carrier wave;
Demodulated data reproducing means for demodulating data based on information from the received signal and the reproduced carrier wave output from the frequency dividing means;
A receiver comprising: The frequency adjusting means is
Reference signal means for outputting a reference signal having the same frequency as that of the carrier wave during adjustment;
Difference frequency generation means for generating a difference frequency pulse signal having a frequency difference between the output signal of the frequency dividing means and the reference signal;
Pulse detection means for detecting the presence or absence of the difference frequency pulse signal having a predetermined time width or less;
Center frequency setting means for outputting a setting signal for setting the center frequency of the center frequency variable bandpass filter;
Based on an upper limit and a lower limit of a set value by which the pulse detecting means is operated by a detection start signal and the setting signal of the frequency setting means is controlled by a setting control signal to obtain a difference frequency pulse signal having a predetermined time width or more. An automatic adjustment control processing unit for adjusting the oscillation frequency of the frequency dividing means to the frequency of the reference signal;
The receiver according to claim 1, comprising: The frequency adjusting means is
The difference frequency pulse signal obtained by inputting the reference signal having the same frequency as the carrier wave and the output signal of the divider means to the demodulated data reproducing means is used to adjust the oscillation frequency of the divider means to the carrier frequency. ,
Demodulation / adjustment switching means for inputting the reference signal to the demodulated data reproducing means at the time of adjustment, and inputting a received signal to the demodulated data reproducing means at the time of reception;
Demodulation connection means for disconnecting the frequency dividing unit and the multiplication / filter means at the time of adjustment and connecting at the time of reception;
The receiver according to claim 1, comprising: The frequency adjusting means is
Reference signal means for outputting a reference signal having the same frequency as that of the carrier wave during adjustment;
Pulse detection means for detecting the presence or absence of the difference frequency pulse signal having a predetermined time width or less;
Center frequency setting means for outputting a setting signal for setting the center frequency of the center frequency variable bandpass filter;
Based on an upper limit and a lower limit of a set value by which the pulse detecting means is operated by a detection start signal and the setting signal of the frequency setting means is controlled by a setting control signal to obtain a difference frequency pulse signal having a predetermined time width or more. An automatic adjustment control processing unit for adjusting the oscillation frequency of the frequency dividing means to the frequency of the reference signal;
The receiver according to claim 3, comprising: The automatic adjustment control means is
Setting value storage means for storing the setting value and outputting a setting signal to the center frequency setting means;
A lower limit set value storage means for storing a lower limit of a set value at which a difference frequency pulse signal having a predetermined time width or more is obtained;
Upper limit set value storage means for storing an upper limit of a set value at which a difference frequency pulse signal having a predetermined time width or more is obtained;
An averaging means for outputting an adjustment signal obtained by averaging upper and lower limits of the set value to the setting storage means;
By controlling the set value of the set value storage means, the upper limit set value storage means and the lower limit set value storage means respectively store the upper limit and lower limit of the set value at which a difference frequency pulse signal having a predetermined time width or more is obtained. Control processing means for performing control and storing the adjustment value in the setting storage means;
The receiver according to claim 2, further comprising: The automatic adjustment control means is
A set value storage means for sequentially switching and storing the set values in accordance with a setting storage control signal, and outputting a setting signal to the center frequency setting means,
The same set value as the setting value storage means is stored up to the lower limit of the set value at which a difference frequency pulse signal having a predetermined time width or more is obtained, and from the lower limit of the set value at which a difference frequency pulse signal having a predetermined time width or more is obtained. An increase number variable counter means for outputting an adjustment value obtained by halving the set value up to the upper limit to the setting storage means;
The same setting as the set value storage means is set in the increase number variable counter means until a set value lower limit is obtained by controlling the set value of the set value storage means to obtain a difference frequency pulse signal having a predetermined time width or more. The value is stored, and an increase control signal that halves the set value between the lower limit and the upper limit of the set value from which a difference frequency pulse signal with a predetermined time width or more is obtained is output, and the adjustment value is stored in the setting Control processing means for performing control to be stored in the means;
The receiver according to claim 2, further comprising: A receiver for receiving information by receiving an electric field based on information to be received induced in an electric field transmission medium,
Multiplication / filter means for multiplying a carrier wave of a predetermined frequency from the received signal modulated with the information to regenerate the carrier wave, and passing the multiplied signal;
It has a center frequency variable bandpass filter that allows the center frequency to be controlled by passing the frequency-divided signal and reproduces the carrier wave by frequency-dividing the frequency-multiplied signal, and the frequency-multiplied signal is input. Frequency dividing means that oscillates at an oscillation frequency that can be set at the center frequency of the center frequency variable bandpass filter if not,
A frequency monitoring / adjusting means for adjusting the oscillation frequency of the frequency dividing means to the frequency of the carrier wave during adjustment, and for comparing and monitoring the oscillation frequency of the frequency dividing means and the carrier wave frequency of the received signal during monitoring;
Demodulated data reproducing means for generating a difference frequency pulse signal from the received signal and the output signal of the frequency dividing means at the time of monitoring and demodulating data based on information from the received signal and the reproduced carrier wave output from the frequency dividing means at the time of reception When,
A carrier regeneration connecting means for disconnecting the multiplication / filter means and the frequency dividing means at the time of adjustment and at the time of frequency monitoring, and for connecting the data when demodulating data based on the information to output a carrier reproduced from the frequency dividing means;
A receiver comprising: The frequency monitoring / adjusting means is
Reference signal means for outputting a reference signal having the same frequency as that of the carrier wave during adjustment;
Difference frequency generation means for generating a difference frequency pulse signal having a frequency difference between the output signal of the frequency dividing means and the reference signal;
Input the difference frequency pulse signal output from the difference frequency generation means and the difference frequency pulse signal output from the demodulated data reproduction means, and at the time of adjustment, output the difference frequency pulse signal output from the difference frequency generation means, A signal selecting means for outputting a difference frequency pulse signal outputted from the demodulated data reproducing means at the time of monitoring;
Pulse detection means for detecting the presence or absence of the difference frequency pulse signal having a predetermined time width or less;
Center frequency setting means for outputting a setting signal for setting the center frequency of the center frequency variable bandpass filter;
Based on an upper limit and a lower limit of a set value by which the pulse detecting means is operated by a detection start signal and the setting signal of the frequency setting means is controlled by a setting control signal to obtain a difference frequency pulse signal having a predetermined time width or more. Automatic adjustment control processing means for adjusting the oscillation frequency of the frequency dividing means to the frequency of the reference signal;
The receiver according to claim 7, comprising: The demodulated data reproducing means includes
At the time of adjustment, a difference frequency pulse signal is generated from a reference signal having the same frequency as the carrier wave and the output signal of the frequency divider, and at the time of monitoring, a difference frequency pulse signal is generated from the received signal and the output signal of the frequency divider. Sometimes the operation of demodulating data based on information from the received signal and the reproduced carrier wave output from the frequency dividing means,
The frequency monitoring / adjusting means uses the difference frequency pulse signal obtained by inputting the reference signal having the same frequency as the carrier wave and the output signal of the frequency dividing means to the demodulated data reproducing means during adjustment. Adjusting the oscillation frequency of the means to the frequency of the carrier wave, performing the operation of comparing and monitoring the difference frequency pulse signal obtained by inputting the received signal and the output signal of the frequency dividing means to the demodulated data reproducing means at the time of monitoring,
Demodulation / adjustment switching means for inputting the reference signal to the demodulated data reproducing means at the time of adjustment, and inputting a received signal to the demodulated data reproducing means at the time of reception;
Demodulation connection means for disconnecting the frequency dividing unit and the multiplication / filter means at the time of adjustment and connecting at the time of reception;
The receiver according to claim 7, comprising: The automatic adjustment control means is
Setting value storage means for storing the setting value and outputting a setting signal to the center frequency setting means;
A lower limit set value storage means for storing a lower limit of a set value at which a difference frequency pulse signal having a predetermined time width or more is obtained;
Upper limit set value storage means for storing an upper limit of a set value at which a difference frequency pulse signal having a predetermined time width or more is obtained;
An averaging means for outputting an adjustment signal obtained by averaging upper and lower limits of the set value to the set value storage means;
At the time of adjustment, the set value of the set value storage means is controlled so that an upper limit and a lower limit of a set value at which a difference frequency pulse signal having a predetermined time width or more can be obtained are respectively stored in the upper limit set value storage means and the lower limit set value storage means. Control to store and control to store the adjustment value in the setting storage means, and when receiving, a frequency error signal is output when a difference frequency pulse signal having a predetermined time width or less is detected in the pulse detection means Control processing means for
The receiver according to claim 7, further comprising: The automatic adjustment control means is
A set value storage means for sequentially switching and storing the set values in accordance with a setting storage control signal, and outputting a setting signal to the center frequency setting means,
Stores the same set value as the set value storage means until the lower limit of the set value at which the detection end signal is obtained, and halves the set value between the lower limit and the upper limit of the set value at which the detection end signal is obtained. An increased number variable counter means for outputting the adjusted value to the setting storage means;
At the time of adjustment, the set value storage means is controlled by the set value storage means until the lower limit of the set value for obtaining the difference frequency pulse signal having a predetermined time width or more is obtained. The same set value is stored, and an increase number control signal that halves the set value between the lower limit and the upper limit of the set value at which a difference frequency pulse signal having a predetermined time width or more is obtained, and the adjustment value is Control processing means for storing in the setting storage means, and a control processing means for outputting a frequency error signal when receiving the detection end signal from the pulse detection means at the time of reception;
The receiver according to claim 7, further comprising: The pulse detection means is
Timer means for measuring a predetermined time,
Detecting both rising and falling of the difference frequency pulse signal within a predetermined time, determining the presence or absence of a difference frequency pulse signal having a predetermined time width or less, and outputting a signal indicating the determination result; The receiver according to claim 1. The time measurement of the timer means,
The receiver according to any one of claims 1 to 12, wherein when the rising or falling edge of the difference frequency pulse signal is detected, it is once cleared and re-timed. The difference frequency generating means is
A difference frequency pulse signal having a frequency corresponding to a difference frequency between the in-phase component and the quadrature component of the output signal of the frequency dividing unit and the reference signal is generated,
Pulse detection means for outputting a detection signal when the pulse width of each difference frequency pulse signal generated from the in-phase component and the quadrature component is equal to or longer than a predetermined time, and outputting a detection period end signal when the pulse width is equal to or shorter than the predetermined time When,
The receiver according to claim 1, further comprising: A receiver according to any of claims 1 to 14;
A transmitter that modulates the information to be transmitted on a carrier wave of the predetermined frequency into a modulated signal and transmits only the carrier wave in a predetermined period immediately before outputting the modulated signal;
A transceiver comprising:

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