JP4773257B2 - Voice recording system for railway vehicles - Google Patents

Description

  The present invention relates to a voice recording system used in railway vehicles such as trains and trains, and more particularly to a voice recording device (voice recorder) for recording sound generated inside and outside a railway vehicle.

  In a railway business that operates trains, trains, etc., there are cases where business communication calls between trains and operation commanders are equipped with a device that constantly records and records the contents of calls at the operation command station on the ground. There is no equipment to record sound including all voices generated in trains such as trains and trains, especially in the driver's cab (cab or conductor).

  Sound, including sound, and train passing, such as location, time, mileage, travel speed, etc., can be added economically and easily based on the equipment currently installed in the train. It has been desired to develop an audio recording apparatus that can record and reproduce the sound separately from other generated sounds.

  An object of the present invention is to provide a voice recording system capable of recording sound collected in a railway vehicle in a state where searching and analysis are easy.

  The present invention employs the following means in order to achieve the above object.

That is, the present invention is an audio recording system mounted on a railway vehicle,
Sound collecting means for collecting sound generated inside and outside the railway vehicle;
Dividing means for dividing the collected sound into at least three frequency bands;
Recording means for recording the sound of each divided frequency band on different recording media,
Including
The sound collecting means includes
Monitor loudspeakers have been crew intercellular communication device mounted on the railway vehicle, a monitor speaker emergency communication device mounted on the railway vehicle, front Symbol microphones constituting the Announcement device mounted on a railway vehicle, and the railway vehicle and at least two of the microphones constituting the contact device between onboard crew,
Monitor speaker of the crew intercellular communication device, a monitor speaker before Symbol emergency communication device, before Symbol microphones constituting the vehicle broadcast device, and voice input respectively to at least two of the microphones constituting the contact device between said crew And a voice synthesizing circuit for synthesizing an acoustic signal.

  Preferably, the dividing unit according to the present invention is configured such that the sound collected by the sound collecting unit includes a sound frequency band that is a frequency band including a human speech sound band and a high frequency band higher than the sound frequency band. And a low frequency band lower than the voice frequency band.

  Preferably, the lower limit of the audio frequency band in the present invention is 200 to 300 Hz, and the upper limit of the audio frequency band is 3000 to 5000 Hz.

  Preferably, in the present invention, the sound of each frequency band divided by the dividing unit is divided into two or more according to the sound pressure level and recorded on different recording media prepared for each sound pressure level. .

  ADVANTAGE OF THE INVENTION According to this invention, the audio | voice recording system which can record the sound collected within a rail vehicle in the state which is easy to search and analyze can be provided.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The configuration of the embodiment is an exemplification, and the present invention is not limited to the configuration of the embodiment.

  FIG. 1 is a diagram showing an example of a voice recording system mounted on a railway formation vehicle including two leading vehicles and one intermediate vehicle. In FIG. 1, an in-car broadcast device 2 is arranged in two leading vehicles and intermediate vehicles. The in-car broadcast device 2 has the following configuration in outline.

  In other words, a conductor microphone 41, a microphone switch 45, a control amplifier 42, and a resistor 46 for adjusting the input audio level to the audio recording apparatus 1 during in-vehicle broadcasting are arranged in the cabin of each head vehicle. In addition, an output amplifier 43 and an in-vehicle speaker 44 are arranged in the cabin of each leading vehicle and intermediate vehicle. The control amplifier 42 and the output amplifier 43 are connected to a voice lead-in line 47 that connects between in-vehicle broadcast vehicles. As a result, the broadcast sound input from each conductor microphone 41 is output from the in-vehicle speaker 44 via the control amplifier 42 and the output amplifier 43.

  In addition, in the crew room of each leading vehicle, inter-crew communication devices 3A and 3B for performing business communication calls between the crew (between the driver and the conductor) are arranged. The inter-crew communication devices 3A and 3B have the same configuration, and are connected via an audio communication line 64 for inter-crew crew and a plurality of control lines (not shown). The crew members can communicate with each other using the crew member communication devices 3A and 3B. The inter-crew communication device may be arranged in an intermediate vehicle.

Furthermore, voice recording devices (voice recorders) 1A and 1B according to the present invention are arranged in, for example, the crew room of each leading vehicle. Note that one of the head vehicles is the head and the other is the tail depending on the traveling direction of the train. The crew room of the leading vehicle on the front side is the driver's room where the driver stays, and the crew room of the last leading vehicle is the conductor's room where the conductor stays.

  FIG. 2 is a diagram showing a detailed configuration of a part of the in-car broadcast device 2, the inter-crew communication device 3A, and the voice recording device 1A arranged in the leading vehicle shown on the left side of FIG. FIG. 3 is a diagram showing a detailed configuration of the in-car broadcast device 2, the inter-crew communication device 3B, and the voice recording device 1B arranged in the leading vehicle shown on the right side of FIG.

  In FIG. 1, the railway train is assumed to travel toward the left side of the page, the crew room in the left leading vehicle functions as a driver's cab, and the crew room in the right leading vehicle functions as a conductor room. It shall be.

  A detailed configuration of the audio recording apparatus according to the present invention will be described with reference to FIG. FIG. 2 shows an operation system of the driver side cabin (operator's cab). In FIG. 2, the vehicle front / rear selector switch 58 is in a state where the contact b indicating the “front” position is selected with respect to the traveling direction, and the driver switch 57 is in the state where the contact b indicating the “on” state is selected. Yes, the microphone switch 45 of the conductor microphone 41 for in-vehicle broadcasting is in a state in which the contact point a indicating the “OFF” state is selected, and the handset hook switch 59 (59-1, 59-2, 59-2) of the inter-crew communication device 3A. 59-3) is a state in which the contacts a indicating the “OFF” state are selected. In this state, it is assumed that the sound recording device 1A, the in-car broadcast device 2, and the inter-crew communication device 3A are all turned on and in an operating state.

In the state described above, the voice recording device 1A collects various sounds including the utterance voice of the driver collected in the cab (for example, the ringing sound from the driving command center, the calling voice from the conductor, the running of the railway vehicle) Sound, brake sound, etc.).

Sound and sound generated outside and inside the cab (hereinafter, the sound and sound are collectively referred to as “sound or the like”) are collected as follows and input to the sound recording device 1A. That is, a signal such as sound collected from the conductor microphone 41 for in-vehicle broadcasting is input from the contact a of the microphone switch 45 via the HYB (hybrid) 33 to the voice synthesis circuit 11 of the voice recording apparatus 1A. In the speech synthesis circuit 11, the signal from the HYB 33 is attenuated by the ATT (attenuator) 12, further amplified by the amplifier 17 via the HYB 15, and output.

  A sound signal collected by the driver microphone 52 passes through the level adjusting resistor 60 from the contact b of the driver switch 57 and is input to the ATT 13 of the voice synthesis circuit 11 of the voice recorder 1A. The Further, a signal such as sound is amplified by the amplifier 17 through the HYB 16 and HYB 15 and output.

  Further, the transmission microphone output (signal such as sound) of the handset 51 handled mainly by the conductor of the inter-crew communication device 3A passes through the HYB 33 from the contact a of the hook switch 59-3, and the voice of the voice recording device 1A. The signal is input to the ATT 12 of the synthesis circuit 11 and further amplified by the amplifier 17 via the HYB 15 and output.

  Further, the monitor speaker 56 for calling the driver of the inter-crew communication device 3A for communication between the driver and the conductor has a circuit contact configuration so that a voice call can be made from the conductor at all times. However, when there is no call from the conductor, it functions as the fourth sound collecting microphone in the crew room (driver's cab). That is, a signal such as sound collected by the monitor speaker 56 is synthesized from the contact a of the hook switch 59-1 through the contact circuit 64 that is “closed” when the receiving amplifier 55 is not operated. The signal is input to the ATT 14 of the circuit 11 and further amplified by the amplifier 17 via the HYB 16 and HYB 15 and output.

  Amplified and synthesized outputs of signals such as sound collected by the conductor microphone 41, driver microphone 52, transmitter microphone of the handset 51, and monitor speaker 56 synthesized and amplified by the amplifier 17 are LPF (low-pass filter). ) 18, BPF (band pass filter) 19, and HPF (high pass filter) 20.

As shown in FIG. 4, the LPF 18 has a lower limit (approximately 2) of the human voice frequency band in the input signal.
The BPF 19 passes a frequency component (low frequency) lower than (00 to about 300 Hz), and the BPF 19 has a human voice frequency band of the input signal (lower limit is about 200 to about 300 Hz, upper limit is about 3000).
The HPF 20 is configured to pass a frequency component (high frequency) higher than the upper limit (about 3000 to 5000 Hz) of the audio frequency band. That is, as shown in FIG. 4, the audio recording apparatus 1A divides a signal such as sound collected by each microphone and monitor speaker into three frequency bands.

  The output signals of the LPF 18, BPF 19 and HPF 20 are input to a level determination circuit 21 (21a to 21c) provided at the subsequent stage. The level determination circuits 21a, 21b, and 21c have the same configuration, and FIG. 2 shows an internal configuration of the level determination circuit 21b as an example.

In the level determination circuit 21b, when the voltage of the input signal from the BPF 19 is equal to or higher than the set value (reference voltage) by the reference voltage source 24, the gate circuit 22 is opened by the output from the comparator 25, and the inverted output by the inverter 26 is obtained. Thus, the gate circuit 27 is closed, and the input signal is input to the amplifier 30c through the gate circuit 22. On the other hand, when the input signal voltage is less than the set value, the gate circuit 22 is closed by the output from the comparator 25, the gate circuit 27 is opened by the inverted output from the inverter 26, and the input signal is amplified through the gate circuit 27. It is input to 30d.

  Thus, the level determination circuit 21b is configured to output a signal to one of the amplifiers 30c and 30d in accordance with the level of the input signal from the BPF 19. Similarly to the level determination circuit 21b, the level determination circuit 21a (21c) also outputs the input signal to the amplifier 30a (30e) when the level of the input signal from the LPF 18 (HPF 20) is higher than the reference voltage. If it is lower, the input signal is output to the amplifier 30b (30f).

  The signals input to the amplifiers 30a to 30f are amplified and then input to any of the corresponding audio recording boards 32a to 32f via the corresponding attenuators 31a to 31f for level adjustment.

  Each of the audio recording boards 32a to 32f has the same configuration, and includes, for example, a processor (control device) such as a CPU, a memory (storage device: recording medium (for example, flash memory)), an input / output interface, a recording circuit, and the like. Become. The sound recording boat 32a converts the input signal into sound digital data and stores it in a storage device, thereby recording sound or the like.

  In this way, as shown in FIG. 5, the audio recording device 1A determines the level of the sound pressure level of the output signal of each of the filters 18, 19, and 20 according to the reference voltage (set value), and has a high sound pressure level. The signal (such as sound) having a low sound pressure level is recorded on a different sound recording board (recording medium).

  With such a configuration, the audio recording device 1A divides the sound collected in the cab into three frequency bands, and further takes into account the sound pressure level (high / low) in each frequency band. Recording is performed on recording media of the audio recording boards 32a to 32f.

  Information such as time, speed, distance (point), and the like, which indicates the progress of train operation, is further input to the audio recording boards 32 a to 32 f through the signal line 34. In addition, control information indicating recording start / end control by the audio recording apparatus 1 is input via the signal line 35. Further, it is possible to configure such that failure detection information of the railway vehicle is input via the signal line 36. The control devices of the sound recording boards 32a to 32f record digital data such as sound and information input from the signal lines 34, 35, and 36 in a storage device (recording medium). As a result, an economical and functional audio recording device can be obtained based on the equipment currently installed in the train.

  FIG. 3 shows a detailed operation system diagram in the conductor side passenger cabin (conductor). In FIG. 3, the vehicle front / rear selector switch 58 in the conductor compartment is in a state of selecting the contact point a indicating the “rear” position with respect to the traveling direction. Further, the driver switch 57 is in a state of selecting the contact point a indicating the “OFF” state. Further, the microphone switch 45 of the conductor microphone 41 for in-car broadcast is in a state in which the contact point a indicating the “OFF” state is selected. In addition, the handset hook switch 59 (59-1, 59-2, 59-3) of the inter-crew communication device 3B is in the “ON” state (selection state of the contact b) when the conductor calls the driver. ing. The voice recording device 1B in the conductor compartment, the in-car broadcast device 2, and the inter-crew communication device 3B are all powered on and in an operating state.

  In the state of FIG. 3, the sound including the utterance voice of the conductor collected in the conductor room is recorded as follows. That is, the sound collected from the conductor microphone 41 for in-vehicle broadcasting is input from the contact a of the microphone switch 45 via the HYB 33 to the ATT 12 of the voice synthesizing circuit 11 of the voice recording apparatus 1B, and further from the HYB 15 to the amplifier 17 Is amplified and output.

  The sound collected by the driver microphone 52 is input from the contact a of the driver switch 57 to the ATT 13 of the voice synthesizing circuit 11 of the voice recording device 1A, and further by the amplifier 17 via the HYBs 16 and 15. Amplified and output. Further, the transmission microphone output of the handset 51 which is mainly handled by the conductor of the inter-crew communication device 3B is sent from the contact a of the vehicle front / rear switch 58 through the level adjustment attenuator (resistor) 61 to the hook switch 59-3. Is input to the ATT 12 of the voice synthesizing circuit 11 of the voice recording apparatus 1B via the HYB 33, and further amplified and output by the amplifier 17 via the HYBs 16 and 15.

  Further, the monitor speaker 56 for calling the driver of the inter-crew communication device 3 for the business communication between the driver and the conductor is in the "ON" state because the conductor makes the business communication with the driver. ing. For this reason, the contact b of the hook switch 59-2 passes through the level adjusting attenuator (resistor) 63 and the level adjusting attenuator (resistor) 62 to the ATT 14 of the voice synthesizing circuit 11 of the voice recording apparatus 1B. Then, the signal is further amplified by the amplifier 17 via the HYB 16 and HYB 15 and output.

  The configuration and operation of the voice recording apparatus 1B are the same as those of the voice recording apparatus 1A in the cab shown in FIG.

  According to the present embodiment, the sound collected in the railway-organized vehicle (railway vehicle) is divided into three frequency band components centered on the audio frequency band, and each frequency band component is recorded on a separate recording medium. Is done. As a result, the collected sound and the like can be recorded for each type of sound. As a result, for example, when recording contents are used for investigating the cause of an abnormal situation that has occurred in a railway vehicle, a mixed sound of various frequencies is recorded. It is possible to prevent the sound from becoming noise.

Furthermore, according to the present embodiment, for each frequency band component (sound frequency band, low frequency, high frequency), the sound pressure level is compared with the reference voltage, and a signal with a sound pressure level higher than the reference voltage A signal having a lower sound pressure level is recorded on a different sound recording board (recording medium). As a result, even in the same frequency band, recording to a different recording medium is performed according to the sound pressure level, so that necessary sound or sound can be easily extracted and reproduced.

  Furthermore, according to the present embodiment, as the sound collecting means for collecting the sound in the vehicle, the conductor microphone 41 of the in-vehicle broadcast device 2, the driver microphone 52 of the inter-crew communication device 3A (3B), and the microphone of the handset 51 , Existing equipment in a railway vehicle such as the monitor speaker 56 is applied. As a result, the cost required for the introduction of the voice recording apparatuses 1A and 1B can be reduced. Moreover, the monitor speaker of the emergency call apparatus mounted in the railway vehicle can be applied as the monitor speaker as the sound collecting means.

According to the present invention, when an abnormal situation occurs in a railway vehicle such as a train or a train, the generated sound including the time before the occurrence of the abnormal situation and the sound for several tens of seconds or several hours after the occurrence of the abnormal situation, Emergency call equipment installed for the purpose of calling the in-car broadcast microphone, the handset and driver microphone for the inter-crew communication device, the monitor speaker for the inter-crew communication device, or the crew, which are already installed in the crew cabin The monitor speaker or the train radio monitor speaker is effectively used as a crew cabin sound collection microphone, and the sound including the collected sound is divided into several frequency bands, and further, the sound collected. The sound recording level including sound is discriminated and the recording level is varied so that the sound pressure is easy to hear, and the operation monitoring device or speed generator installed in the vehicle ( TG), train operation information (operation number, vehicle number, point information, speed information, etc.) and a certain speed, for example, emergency brake information when emergency braking is applied at a speed of 20 km or more In addition, it is possible to provide an audio recording device (voice recorder) for a railway vehicle, which can better analyze the situation when an abnormal situation occurs.

FIG. 1 is a diagram showing an example of mounting an audio recording device on a railway-organized vehicle. FIG. 2 is an operation system diagram of the voice recording device in the driver side crew room shown in FIG. FIG. 3 is an operation system diagram of the voice recording device in the conductor side crew room shown in FIG. FIG. 4 is a diagram showing an embodiment in which the frequency of the collected sound or the like is divided into three and recorded. FIG. 5 is an explanatory diagram of an embodiment in which a sound pressure level such as sound in each frequency band is recorded by being divided into two.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1A, 1B ... Voice recording device 2 ... In-car broadcast device 3A, 3B ... Crew attendant communication device 11 ... Voice synthesis circuit 12, 13, 14, 31a-31f ... Level adjustment attenuator 15, 16, 33, 54 ... HYB (hybrid)
17, 25, 30a-30f ... Amplifiers 18, 19, 20 ... Filters 21a-21c ... Level judgment circuit 22 ... Audio gate circuit 23 ... Rectifier 24 ... Reference voltage 26 ...・ Inverters 32a to 32f: voice recording boards 34, 35, 36 ... input information 41 ... conductor microphone 42 ... control amplifier 43 ... output amplifier 44 ... in-vehicle speaker 45 ... microphone Switch 46, 60, 61, 62, 63 ... Level adjuster 47 ... In-car broadcast voice communication line 51 ... Handset 52 ... Driver microphone 53 ... Sending amplifier 55- ..Receiving amplifier 56 ... Monitor speaker 57 ... Driver switch 58 ... Vehicle front / rear selector switch 59 ... Hook switch

Claims (4)

An audio recording system mounted on a railway vehicle,
Sound collecting means for collecting sound generated inside and outside the railway vehicle;
Dividing means for dividing the collected sound into at least three frequency bands;
Recording means for recording the divided sound of each frequency band on different recording media, and
The sound collecting means includes
Monitor loudspeakers have been crew intercellular communication device mounted on the railway vehicle, a monitor speaker emergency communication device mounted on the railway vehicle, front Symbol microphones constituting the Announcement device mounted on a railway vehicle, and the railway vehicle and at least two of the microphones constituting the contact device between onboard crew,
Monitor speaker of the crew intercellular communication device, a monitor speaker before Symbol emergency communication device, before Symbol microphones constituting the vehicle broadcast device, and voice input respectively to at least two of the microphones constituting the contact device between said crew And a voice synthesizing circuit for synthesizing an acoustic signal. The dividing means is configured to divide the sound collected by the sound collecting means into a sound frequency band that is a frequency band including a human speech sound band, a high frequency band higher than the sound frequency band, and the sound frequency band. The audio recording system for a railway vehicle according to claim 1, wherein the audio recording system is divided into lower frequency bands. The railway voice recording system according to claim 2, wherein a lower limit of the voice frequency band is 200 to 300 Hz, and an upper limit of the voice frequency band is 3000 to 5000 Hz. The sound of each frequency band divided by the dividing means is divided into two or more according to the sound pressure level and recorded on different recording media prepared for each sound pressure level. An audio recording system for a railway vehicle as described.

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