JP3025143U - Infrared communication device - Google Patents

Abstract

The present invention provides an infrared communication device for transmitting voice and various control signals between a car body and a lifter in a ladder car. SOLUTION: A voice is converted into a voice signal fvc by a microphone 8 and control signals S1 to SN are converted into V / F converters 111 to 111.
The signals are converted into signals f1 to fN by 11N, mixed by the analog mixer 12, modulated by the modulator 14, and then transmitted from one infrared transceiver 6 to the other infrared transceiver 6 and received by the infrared transceiver 6. Demodulated infrared signal 1
After demodulating at 6, the bandpass filter 17 separates the audio signal fvc and other signals f1 to fN, the audio signal is output from the speaker 19, and the signals f1 to fN are converted by the F / V converter. Control signals S1 'to SN'
Is configured to play.

Description

[Detailed description of the device]

[0001]

[Technical field to which the device belongs]

 The present invention relates to an infrared communication device for transmitting a voice signal and various control signals between a lifter provided on a ladder and a vehicle body in a ladder vehicle such as a fire ladder vehicle.

[0002]

[Prior art]

 Conventionally, a radio communication system using radio waves has been used for communication between a lifter provided on a ladder of a ladder vehicle and the vehicle body. However, this method has problems such as interference from radio waves from the outside, restrictions on the frequency band, the number of channels, and output power due to the Radio Law, and further, eavesdropping from the outside.

In particular, in the wireless communication system, various control signals cannot be transmitted, and therefore a person on the lifter side gives a voice instruction to the person on the vehicle body side through the communication device to control the direction and height of the ladder and the lifter. As a result, there was a problem that the ladder and lifter could not be operated efficiently in a fire ladder car, which is especially urgent.

As a method for solving this, a communication method using inductive wireless has been devised. This method communicates by passing a high-frequency signal current through the wire of the lifter, and is characterized by not being restricted by the Radio Law and causing no problems such as interference due to external radio waves. .

[0005]

[Problems that the device is trying to solve]

 However, in the above method, a high-frequency current, though weak, flows through the vehicle body, which may cause an electrical device mounted on the vehicle body to malfunction.In addition, the wire may be passed through the induction coil during installation. In addition, a process of insulating the wire from the vehicle body is required, which causes a problem that the manufacturing process of the ladder must be significantly changed.

In addition, even in this method, various control signals cannot be transmitted, and the person on the lifter side can control the direction and height of the ladder and the lifter on the person on the vehicle body side through the communication device. Because of the oral instructions, it was not possible to solve the problem of inability to operate ladders and lifters efficiently in fire ladder cars, which are particularly urgent.

[0007]

[Means for Solving the Problems]

 The present invention has been made in view of the above, and is an infrared communication device for mutually transmitting voice signals and various control signals between a lifter provided on a ladder of a ladder car and the car body. , The various control signals from the lifter side or the automobile body side are converted into signals having different frequencies by V / F conversion means, mixed with the audio signals and modulated, and further transmitted as infrared signals. Receiving and transmitting the infrared signal transmitted from the transmitting unit on the other side, converting it to an electric signal and demodulating it, and further demultiplexing into a voice signal and a signal having a different frequency by a bandpass filter, Infrared ray composed of a receiving section for converting the demultiplexed signals having different frequencies into various control signals by an F / V converting means and outputting the control signals together with an audio signal. There is provided a communication device.

[0008]

[Embodiment of device]

 The present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing an infrared communication device according to an embodiment of the present invention. In the figure, reference numeral 1 is a ladder automobile body, and a ladder 2 is supported by a ladder support portion 1 '. A lifter 3 is provided on the ladder 2, and the ladder 2 and the lifter 3 are driven by a power source (not shown).

A control box 4 on the side of the automobile body 1 is connected to various control devices (not shown) in the automobile body 1. On the other hand, 5 is a control box on the side of the lifter 3, and the control box 4 and the control box 5 are configured to mutually transmit and receive signals via infrared rays through the infrared transceivers 6 and 6.

FIG. 2 shows a block diagram of an infrared communication device according to an embodiment of the present invention. In the figure, 6 is a portion corresponding to the infrared transmitter / receiver in FIG. 1, and an infrared transmitter 6'is an infrared light emitting element composed of a high brightness infrared light emitting diode or a near infrared laser diode and the infrared light emitting element. It is composed of a driving circuit system for driving and an optical system for giving directivity to the output infrared signal.

On the other hand, the infrared receiving section 6 ″ is located in front of the infrared receiving element such as a photodiode or a phototransistor having a light receiving sensitivity in the near infrared region, and a visible light that blocks external light. It is composed of a light cut filter, a light receiving optical system, and a preamplifier circuit system that amplifies an output signal of the infrared ray light receiving element Note that, in the block diagram of FIG. It is a circuit part in the control boxes 4 and 5.

Reference numeral 7 denotes a transmission unit in the control boxes 4 and 5, and a voice signal from the microphone 8 is amplified by the microphone amplifier 9 to a predetermined signal level, and a signal having a frequency band of fvc is output. If necessary, the microphone amplifier 9 is provided with a bandpass filter characteristic to remove unnecessary noise (for example, wind noise or low frequency noise generated from the lifter 3) that has entered the microphone 8 from the outside. . In addition, the microphone 8 has a drip-proof treatment so that it can be used even in a bad environment.

S1 to SN are various control signals consisting of N channels, which are amplified to different signal levels by the control signal amplifiers 101 to 10N, respectively, and V / F (voltage / frequency) converting means V / F (voltage / frequency) converting means. The F converters 111 to 11N convert the signals into different frequency bands consisting of N channels f1 to fN, mix fvc and f1 to fN in the analog mixer 12, and generate a signal based on the carrier signal output from the oscillator 13. Then, it is FSK-modulated by an FSK (Frequency Shift Keying Modulation) modulator 14, transmitted to the infrared light emitting section 6 ', and outputted as an FSK-modulated infrared signal.

In this embodiment, the FSK modulator 14 temporarily modulates the input signal by PWM (Pulse Width Modulation) and modulates the modulated signal into an FSK signal at a predetermined sampling rate. . In contrast to the FSK modulator 14, the FSK demodulator 16 to be described later converts the FSK-modulated input signal into a PWM signal and further demodulates it into an analog signal. By adopting such a modulation method, the reliability of data in transmission and reception will be greatly improved.

On the other hand, reference numeral 15 is a receiver in the control boxes 4 and 5, and the output signal of the infrared receiver 6 ″ is FSK demodulated by the above FSK demodulator 16 based on the carrier signal output from the oscillator 13. The analog signal is converted into an analog signal, and the analog signal is separated into a voice signal fvc and other signals f1 to fN consisting of N channels by a band pass filter 17. The voice signal fvc is amplified by a speaker amplifier 18. , And is output as sound from the speaker 19. The speaker 19 is also subjected to a drip-proof treatment, and can be used even in a bad environment.

Further, the N-channel signals f1 to fN are converted into respective level signals by F / V converters 201 to 20N as F / V (frequency / voltage) conversion means, respectively, and further controlled by a control signal amplifier. The signals are amplified to appropriate level signals by 211 to 21N and output as various control signals S1 'to SN' consisting of N channels. The control signals S1 'to SN' are output mainly to various control devices in the vehicle body 1 in the control box 4, and to various display devices in the control box 5.

In this embodiment, the infrared communication system uses the simplex communication system because of cost considerations. For this reason, the transmission / reception detection circuit 22 is provided, and when the transmission unit 7 is in the transmission state, the transmission / reception control unit 23 outputs the reception non-permission signal to the infrared reception unit 6 ″ to make it in the unreceivable state. When the receiving unit 15 is in the receiving state, it outputs a non-transmission signal to the infrared transmitting unit 6'to make it in the transmission disabled state so that the signal from the other party can be completely received.

The present invention has been described above based on the embodiment, but the present invention is not limited to the above-described embodiment, and may be modified as long as the configuration described in the utility model registration claim is not changed. But you can do it. For example, in the present embodiment, the simplex communication system is adopted as the communication system, but the present invention is not limited to this, and it goes without saying that the duplex communication system may be adopted. Further, the modulation method of the infrared signal is not limited to the FSK modulation method as in this embodiment, and may be, for example, an FM (Frequency Modulation) method, an AM (Amplitude Modulation) method, or a PWM (Pulse Width) method. Modulation) method or another modulation method may be adopted.

[0019]

[Effect of device]

 As described above, the infrared communication device according to the present invention is more cost effective than the conventional communication system because it can be easily installed without changing the manufacturing process or structure of the device itself such as a ladder. Moreover, not only audio signals but also various control signals consisting of multiple channels can be transmitted simultaneously on the infrared signal of a single wavelength and without error, so that the entire device can be operated at high speed and accurately. , And so on.

[Brief description of drawings]

FIG. 1 is a block diagram showing an infrared wireless communication device according to an embodiment of the present invention.

FIG. 2 is a block diagram showing an infrared wireless communication device according to an embodiment of the present invention.

[Explanation of symbols]

1 Car Body 1'Ladder Support 2 Ladder 3 Lifter 4, 5 Control Box 6 Infrared Transmitter / Receiver 6'Infrared Transmitter 6 "Infrared Receiver 7 Transmitter 8 Microphone 9 Microphone Amplifier 101-10N, 211-21N Control Signal Amplifier 111 ~ 11N V / F converter 12 Analog mixer 13 Oscillator 14 Modulator 15 Receiver 16 Demodulator 17 Bandpass filter 18 Speaker amplifier 19 Speaker 201-20N F / V converter 22 Transmission / reception detector 23 Transmission / reception control unit fvc voice signal f1 -FN frequency conversion signal S1-SN, S1'-SN 'control signal

Continuation of the front page (51) Int.Cl. ⁶ Identification number Reference number within the agency FI Technical display location A62C 27/00 506 H04B 10/00 10/28 10/26 10/14 10/04 10/06 H04B 9/00 Y

Claims (1)

[Scope of utility model registration request] 1. An infrared communication device for mutually transmitting a voice signal and various control signals between a lifter provided on a ladder of a ladder car and the car body, wherein the lifter side or the car body side From the transmitting section on the other side and the transmitting section for converting the various control signals from the above into various signals having different frequencies by the V / F converting means, mixing with the audio signal to modulate, and transmitting as an infrared signal. Receives the transmitted infrared signal, converts it to an electric signal, demodulates it, and demultiplexes it into a voice signal and a signal with a different frequency by a bandpass filter,
An infrared communication device, comprising: a receiving unit that converts the demultiplexed signals having different frequencies into various control signals by an F / V conversion unit and outputs the control signals together with an audio signal.