JPS61109328A - Radio equipment - Google Patents

Abstract

PURPOSE:To simplify the circuit constitution and to miniaturize the device by using a circuit applying modulation to an output of a phase correction circuit applying phase shift correction to a modulation signal so as to synthesize a received demodulation signal including a component of the modulation signal thereby using the synthesized signal as a reception output. CONSTITUTION:An output signal of a microphone 11 is subject to low frequency amplification 12 at simultaneous transmission/reception and the result is fed to a circuit 17 for generating a reception local signal and a transmission frequency signal as the transmission modulation wave, modulated and irradiated from an antenna 1 from a power amplifier 8 via a transmission/reception common use filter 2. In this case, the reception local signal fed to a reception mixer 4 is subject to modulation by the transmission modulation wave. In this case, since the reception local signal fed to the reception mixer 4 is modulated by the transmis sion modulation wave, the IF converted by the mixer 4 includes the transmission modulation wave component. This component is subject to the phase change by a BPF in an IF circuit 5 and demodulated (6). On the other hand, the transmission modulation wave is fed to a phase shift circuit 15, where the signal is subject to phase change similar to the phase shift characteristic of the BPF, and the result is fed to a synthesis circuit 16 and cancelled by the transmission modulation wave component of the output of the demodulator 6. Thus, only the normal reception wave component is outputted from the circuit 16.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to radio equipment, and more particularly to the configuration of a simultaneous transmitting/receiving radio equipment that shares a receiving local signal and a transmission frequency signal generating circuit.

BACKGROUND OF THE INVENTION Conventionally, the block configuration of this type of radio equipment is as shown in FIG. They were added to the mixer 14 at the same time, and the configuration required two mixers.

In FIG. 2, during transmission, the output signal of the microphone 11 is amplified by a low frequency amplifier 12 and then applied to a modulator 13. The output of the modulator 13 is converted into a transmission frequency by a transmission mixer 14, passed through an n1 high frequency filter 18, a power amplifier 8, a duplexer filter 2, and is guided to an antenna l.

When receiving power, the received frequency signal from the airborne IT is
The signal is guided from the transmitter/receiver filter 2 to the reception mixer 4 through the high frequency amplifier circuit 3. The signal converted to an intermediate frequency by the reception mixer 4 passes through an intermediate frequency circuit 5, is demodulated by a demodulator 6, is amplified by a low frequency amplifier 9, and is sent to a speaker l.
lead to O.

Problems to be Solved by the Invention As explained above, in this type of configuration, two mixers are required, one for reception and one for transmission69, and in order to eliminate transmission spurious, a mixer for transmission 14, It is also necessary to insert a high frequency filter 18 between the power amplifier 8 and the wireless device to be miniaturized, which has the drawback of requiring a large amount of space and increasing the price.

In addition, from the perspective of transmission frequency stability, both the output frequency stability of the reception local and transmission 1 frequency generation signal generation circuit 7 and the output frequency stability of the modulator 13 are taken into account, so it is a double-edged product. It is necessary to tighten the output frequency stability of the circuit, which is a factor that increases the price of this device.

The unexploded 8A was made in order to eliminate the above-mentioned drawbacks inherent in the conventional technology, and therefore, the objects of the present invention are to provide a simple structure, easy miniaturization, inexpensive formation, and high frequency stability. Another object of the present invention is to provide a new radio device that can be easily obtained.

Means for Solving the Problems In order to achieve the above object, a radio device according to the present invention is a simultaneous transmitting/receiving radio device M device that shares a receiving local signal and a transmitting frequency signal generation circuit. a means for applying modulation to the ON signal generation circuit; a phase shift correction circuit for correcting the phase shift of the modulation signal; and an output of the phase shift correction circuit and the means for applying the modulation including a component of the modulation signal xp. It is configured to include a combining circuit that combines received demodulated output signals and receives the combined output (i output).

The block configuration of the present invention is shown in FIG. In FIG. 1, at the time of transmission, the reception local signal and transmission frequency signal generation circuit 17 is modulated by the modulation signal that is the output of the low frequency amplifier 12, and the modulation signal is sent to the phase shift correction circuit 15. Add. The output signal of the phase shift correction circuit 15 and the output signal of the receiving demodulator 6 are combined by a combining circuit 16 n1
The signal is applied to the receiving low frequency amplifier circuit 9.

EMBODIMENT OF THE INVENTION The present invention will be explained in detail below with reference to FIG. 1 with regard to a preferred embodiment thereof.

Is Figure 1 an implementation of the present invention? FIG. 2 is a block configuration diagram showing lI. In FIG. 1, the output of the reception (N local signal and transmission frequency signal generation circuit wa17) is applied to both the reception mixer 4 and the power jl+- device 8.

In only the reception state, the ~3- reception frequency signal from the antenna l passes through the duplexer filter 2 and the high frequency amplification circuit 3, and is applied to the reception mixer 4. The signal converted to an intermediate frequency by the mixer 4 is sent to an intermediate frequency circuit 5.
The signal passes through the demodulator 6 to become a demodulated signal, and is applied to the synthesis circuit 16. Since there is no output from the phase shift correction circuit 15 when only in the reception state, the demodulated signal passes through the low frequency amplifier 9 without undergoing any change in the synthesis circuit 16 and is outputted from the speaker 10.

During simultaneous transmission and reception, the output signal of the microphone 11 is amplified by the low frequency amplifier 12 and applied as a transmission modulated wave to the reception local signal and transmission frequency signal generation circuit 17, where it is modulated and transmitted from the power amplifier 8 to the transmission/reception duplexer. filter 2
It passes through the antenna and is radiated from the antenna.

At this time, since the reception local signal applied to the reception mixer 4 is also modulated by the transmission modulation wave,
The intermediate frequency converted by the mixer 4 includes a transmission modulated wave component. The transmitted modulated wave component undergoes a phase shift change due to the influence of a bandpass filter provided in the intermediate frequency circuit 5, and is demodulated by a demodulator 6. -2, the transmitted modulated wave is applied to the phase shift circuit [15] and is applied to the synthesis circuit 16 after undergoing a phase shift change similar to the phase shift axis characteristic of the bandpass filter n1, and the output of the demodulator 6 is It is combined with the transmission modulated wave component by the combining circuit 16 so that they cancel each other out. For this reason, the output signal of the combining circuit 16 does not include the transmitted modulated wave component, and the receiver output from the speaker 10 does not include the transmitted modulated wave component and only the normal received wave component is output.

Note that in the case of other electric fields, the S of the receiving demodulator output decreases, so it is possible that the canceling of the transmitted modulated wave component does not work in the combining circuit [16], but in general, simultaneous transmission Since the receiver radio does not use a squelch circuit to connect a line in a low electric field, the above problem is solved.

As described in detail, in the present invention, the number of mixer circuits and high frequency filter circuits can be reduced, and the transmitted modulated wave component can be canceled at low frequencies! 511, the circuit structure of the radio device is simpler than the circuit structure complicated by high frequency, and the miniaturization of the radio device also has the advantage of reducing the n1 price.

Furthermore, for the transmission (N frequency stability), it is only necessary to consider the reception local and transmission frequency frequency stability, which is extremely advantageous over the conventional method.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of a simultaneous transmitting and receiving radio device according to the present invention, and FIG. 2 is a block diagram showing an example of the configuration of a conventional simultaneous transmitting and receiving radio device. l... Antenna, 2... Dual transmitter/receiver filter, 3...
・High frequency amplification circuit, 4.14...Mixer, 5...Intermediate frequency circuit, 6...Demodulator, 7...Generation circuit for reception local signal and transmission frequency generation signal, 8... Power amplifier, 9.12...Low frequency amplifier, lO...Speaker, ll...Microphone, 13...Modulator, 15...
5 phase shift correction ports, 16... synthesis circuit, 17... generation circuit for reception local signal and transmission frequency signal, 18...
Frequency filter α

Claims (1)

[Claims] In a simultaneous transmitting/receiving radio device that shares a receiving local signal and a transmitting frequency signal generating circuit, means for modulating the signal generating circuit with a modulating signal during transmission, and a phase shift correction circuit for phase shift correcting the modulated signal. , a combining circuit which combines the output of the phase shift correction circuit and a received demodulated output signal containing a component of the modulated signal by the means for applying modulation, and uses the combined output as a received output. Machine.