JPS6253550A - Digital data transmission circuit - Google Patents

Abstract

PURPOSE:To miniaturize the titled device, to simplify the circuit and to reduce power consumption by providing a digital transmitter and a digital receiver. CONSTITUTION:The DC component is cut off by a capacitor 10 in a saturation amplifier circuit 8 and a data is inputted to a saturation amplifier circuit section comprising an inverter 13. The input to the inverter 13 is biased to a voltage between H and L levels of a digital data output to form a high gain point of the inverter thereby changing minutely the input signal, which is subject to saturation amplifier. The amplified digital data is waveform-shaped as a digital data inputted to a digital equipment 1' by a waveform shaping circuit 9 and the result is inputted to the digital equipment 1'. Thus, miniaturization, low power consumption and simplicity of the circuit are attained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a digital data transmission circuit that enables wireless communication between digital devices.

[Background of the invention]

Conventional network communication circuits between digital devices, ie, digital data transmission circuits, are connected by wires to transmit and receive digital signals and to be controlled. Therefore, when installing new digital equipment, not only does the wiring work become complicated, but if the installation location of the equipment is changed after installation, the wiring work must be redone.

Furthermore, if wiring work is kept to a minimum, there is a problem in that the range of installation locations is restricted. In addition, there are cases where digital devices communicate wirelessly using the 50 GHz (permitted frequency band according to the current Radio Law) frequency band, but not only is this extremely expensive, but the equipment is large and the circuitry is complex. There was a drawback to that.

[Purpose of the invention]

The present invention has been made in view of the problems in the prior art described above, and aims to provide a digital data transmission circuit that is small in size, has low power consumption, has a simplified circuit, and is capable of wireless communication over a network between digital devices. purpose.

[Summary of the invention]

The present invention focuses on the fact that the communication content is binary digital data of "0" and "1" when performing wireless communication over a network between digital devices, and uses wireless communication to transmit digital data. It is characterized by the use of an inverter in the amplifier circuit and waveform shaping circuit of the receiving device to achieve small size, low power consumption, and simplified circuitry.

[Embodiments of the invention]

Hereinafter, one embodiment of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a specific circuit configuration diagram, and is a system configuration diagram between digital devices intended for wireless communication. In the figure, 1
, 1' indicate digital devices that perform digital wireless communication. 2 is a local oscillation circuit, 3 is a local oscillation circuit 2
A transmitting bandpass filter removes harmonics of the amplitude modulated wave interrupted by , and a transmitting antenna 4 constitute a digital transmitter.

B indicates a digital receiving device, which includes a receiving antenna 5 for receiving the digital signal transmitted through the transmitting antenna 4, and a receiving bandpass filter 6 for improving the S/N ratio of the received amplitude modulated wave. , a detection circuit 7, a saturation amplifier circuit 8, and a waveform shaping circuit 9. That is, the digital transmitter A is on the digital device 1 side.
is attached, and a digital receiver B is attached to the other digital device 1', and wireless communication is established between the respective digital devices 1 and 1'.

FIG. 2 is a specific circuit configuration diagram of the saturation amplifier circuit 8 in the circuit of FIG. The output signal is output to the waveform shaping circuit 9.

Next, the operation of the circuits shown in FIGS. 1 and 2 will be explained. First, the local oscillator 2 of the digital transmitter A is turned on by the output data from the digital device I.

Turn off. The harmonics of the amplitude modulated wave thus interrupted are removed by the transmission bandpass filter 3.

It is transmitted from the transmitting antenna 4. The receiving antenna 5 of the digital receiving device B receives this amplitude modulated wave, and the received amplitude modulated wave has its S/N ratio improved by the receiving bandpass filter 6, and is converted into small signal digital data by the detection circuit 7. 5, which is input to the saturation amplifier circuit 8. In the saturation amplifier circuit 8, the DC component is cut off by the capacitor 10 in FIG. The input of this inverter 13 is biased between the voltages corresponding to the rHJ level and rT=J level of the digital data output, and is a high gain point in the inverter, and is saturated and amplified by slightly changing the input signal. Ru. The amplified digital data is waveform-shaped by the waveform shaping circuit 9 into digital data that can be input to the digital device 1', and then input to the digital device 1'.

In this way, digital device 1 and digital device 1
', data is transmitted by wireless communication. Therefore, according to this system, there are no restrictions on the installation location of digital equipment, and since an inverter is used in the amplifier circuit and waveform shaping circuit, it is possible to reduce the size, reduce power consumption, and simplify the circuit.

〔Effect of the invention〕

As is clear from the above-described embodiments, according to the present invention, digital data is transmitted using wireless communication, and an inverter is used in the amplifier circuit and waveform shaping circuit of the receiving device.

There are advantages such as not only the system configuration can be simplified and miniaturized, but also low power consumption can be achieved and there are no restrictions on the installation location of digital equipment.

[BRIEF DESCRIPTION OF THE DRAWINGS] The attached drawings are diagrams for explaining one embodiment of the present invention, in which FIG. 1 is a functional block diagram of a digital data transmission system, and FIG. 2 is a diagram illustrating the circuit of FIG. It is a detailed circuit diagram of the main part. 1.1'...Digital equipment, 2...Local oscillator,
3... Bandpass filter for transmission, 4... Antenna for transmission, 5... Antenna for reception, 6... Bandpass filter for reception, 7... Detection circuit, 8... Saturation amplifier circuit, 9・・・
- Waveform shaping circuit, 10... Capacitor, 11... Feedback resistor, 12... Inverter, A... Digital transmitter, B... Digital receiver. Patent applicant Hitachi Shonan Electronics Co., Ltd. Agent Patent attorney Tadashi Akimoto Figure 1 Figure 2

Claims (1)

[Claims] In a digital data transmission circuit between a plurality of digital devices, a digital transmitter is provided in a transmitting digital device and includes a local oscillator, a transmitting bandpass filter, and a transmitting antenna for transmitting digital data as an amplitude modulated wave; A digital receiving device is installed in a receiving digital device and consists of a receiving antenna for receiving amplitude modulated waves from a digital transmitting device, a receiving bandpass filter, a detection circuit for detecting the amplitude modulated waves, and a saturated amplification circuit using an inverter. A digital data transmission circuit comprising: