JPH06244972A - Voice transmitter - Google Patents

Abstract

PURPOSE:To smooth the work by eliminating redundant information from a voice signal with a compressor and sending the resulting signal to a communica tion line. CONSTITUTION:A voice signal is converted into a digital signal by an input means 10. A microphone 12 transduces a sound pressure signal into an electric signal, after the signal is amplified and given to a low pass filter 16, in which excess high frequencies in excess of the sampling frequency are eliminated and an A/D converter 18 is used to convert the signal into a digital signal by a proper sampling time. A voice conversion circuit 20 applies code compression to the digital signal and stores the signal and employs a PCM circuit 22 to apply pulse code modulation and to eliminate redundant information and the signal is compressed into a data quantity able to be sent through a communication line 40. Thus, voice information is sent in real time by using a communication line for air-conditioning control and it is not required to provide an independent interphone line and a smooth work is attained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a voice transmission device suitable for use inside a building, and to an improvement for reducing the work of laying a transmission line.

[0002]

2. Description of the Related Art In an air conditioning control device, for example, Japanese Patent Application No. 4-4
As disclosed in Japanese Patent No. 5345, a telephone line is connected to an internal bus of a control device so that a customer directly applies an operating time of an air conditioner in association with a change in overtime hours without bothering an operator. There is. By the way, although air conditioning work is also performed before the completion of the building, it is rare that the installation work of the telephone line is completed at that time. Since the central monitoring device is placed in the control room of the air conditioning control device, and the air conditioners around it are installed on each floor and each room, the work of laying the control line connecting them is performed. At this time, considering the convenience of work, an intercom line was laid apart from the control line so that the work would not be inconvenient even if the telephone line was not installed or was separated from the existing terminal.

[0003]

The work for laying the intercom line as described above is performed in consideration of the smoothness of the construction work for air conditioning control, but it occupies a considerable proportion of the construction cost for air conditioning control. The present invention solves such a problem, and an object of the present invention is to provide a voice transmission device that does not require the work of laying an intercom line and reduces the construction cost without impairing the smoothness of the construction work for air conditioning control. And

[0004]

According to the present invention which achieves the above object, a voice input means (10) for converting voice into a digital signal and a code compression of a signal converted into a digital signal by the voice input means. Code storage means (2
0), a transmitting station having a transmitting device (30) for outputting the code signal accumulated in the code storing means to the communication line (40), and a receiving device for receiving the code signal sent from the communication line ( 50), a voice demodulation circuit (60) for demodulating the code signal received by the receiving device into a voice signal, and a voice output means (70) for converting the signal demodulated by the voice demodulation circuit into sound pressure. Stations, and the communication lines are
It is characterized by being shared with a digital communication line for air conditioning control.

[0005]

In the present invention, the transmitting station converts the voice signal into a digital signal, compresses it into a data amount that can be transmitted through the communication line, and sends the processed data to the target receiving station. The receiving station demodulates the data intercepted through the communication line, converts it into an analog signal, and outputs the sound. As a result, it becomes possible to transmit voice through the communication line used for air conditioning control, and the dual use of the line is promoted.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. Figure 1
FIG. 3 is a configuration block diagram showing an embodiment of the present invention. In the figure, a communication line 40 is laid for air-conditioning control, and digital information transmission with an information transmission speed of about 10 kbps or higher can be performed, for example. This communication line 4
0 indicates a control computer 42 and a control input / output device 4
4 are connected, and data is collected at regular intervals.

The transmitting station converts voice into digital data and outputs it to the communication line 40. The internal structure is as follows. The voice input means 10 converts voice into a digital signal. The general-purpose microphone 12 converts the sound pressure signal into an electric signal, the amplifier 14 amplifies the signal, and the low-pass filter 16 converts an extra high frequency exceeding the sampling frequency. The signal is removed and converted into a digital signal by the A / D converter 18 at an appropriate sampling time. The voice modulation circuit 20 code-compresses a digital signal and temporarily stores it. The PCM circuit 22 performs pulse code modulation, removes redundant information, and compresses it to a data amount that can be transmitted through the communication line 40. . The code storage device 24 is a PC
The code signal modulated by the M circuit 22 is temporarily stored. The central processing unit 25 performs various processes. Here, when the code signal stored in the code storage unit 24 is packetized and the bus right of the communication line 40 is acquired, a command to send the packet to the receiving station of the transmission destination is issued. I do. The transmitter 30 receives the command from the central processing unit 25 and outputs the packet to the communication line 40.

The receiving station restores the digital signal received from the communication line 40 to a voice signal, and the receiving device 50 receives the packet sent to itself by the communication line 40. The central processing unit 55 sends the packet received by the receiving device 50 to the voice demodulation circuit 60. The voice demodulation circuit 60 demodulates the digital signal included in the received packet into a voice signal. The packet is temporarily stored in the code storage device 62, and the digital signal code-compressed by the PCM demodulation device 64 is converted into the original digital signal. Demodulate to signal, D / A
The converter 66 converts it into an analog signal. Audio output means 7
Reference numeral 0 is a device for converting an analog signal demodulated by the audio demodulation circuit 60 into sound pressure, which is D / A by the low-pass filter 72.
The pulse noise accompanying the conversion is removed, the amplifier 74 converts the analog noise into an analog electric signal, and the analog electric signal is sent to the speaker 76.

FIG. 2 is a waveform diagram for explaining the operation of the apparatus of FIG. 1. (A) is a voice input signal, (B) is a sampling signal, (C) is a PCM signal, and (D) is on a communication line. Packets, (E) is a received code signal, and (F) is a voice output signal. First, since an analog signal corresponding to voice is input from the microphone, it is converted into a digital signal at the sampling cycle determined by the A / D converter 18, and the PCM circuit 2
The code is compressed by 2 to generate time series data D _{0 to} D _n . Then, the central controller 25 generates a packet,
Here, one packet is formed by grouping four pieces of data (D _{0 to} D ₃ , D _{4 to} D ₇ ). Then, the transmitting device 30
The packets are sequentially sent to the communication line 40 by the receiving device 50, and the receiving device 50 receives the packets and the code storage device 6
2 develops into code signals D _{0 to} D _n . Thereafter, the PCM demodulator 64 restores the digital signal before time compression and performs D / A conversion, and the speaker 76 outputs the original audio signal.

FIG. 3 is a configuration block diagram showing a modified embodiment of the present invention. In the apparatus of FIG. 1, since the transmitting station and the receiving station are independent, one-way information transmission such as broadcasting is possible, but it is more convenient to be able to perform two-way communication at the time of construction. Therefore, in order to form an intercom configuration, each device is configured with a set of a transmission station and a reception station, and each device is connected by a communication line 40 to enable bidirectional communication.

FIG. 4 is an explanatory diagram of a communication line considering the convenience of construction. A connection terminal 46 is appropriately provided on the communication line 40. If the controller 43 or the IO module 44 is connected to the connection terminal 46, the air conditioning control can be easily performed, and if the intercom is connected to the vacant connection terminal 46, the voice information can be transmitted.

As described above, according to the present invention, since redundant information is removed from the voice signal by the code compression device and the voice signal is sent to the communication line, real-time voice information transmission is performed for air conditioning control communication. It can be done using a line, eliminating the need for a separate intercom line during construction,
This has the effect of facilitating construction. In addition, when the code signal is packetized and sent to the communication line as in the embodiment, the effect that the voice signal can be smoothly transmitted even if the communication line is provided with various incidental facilities such as a gateway, a router, and a bridge. is there.

[Brief description of drawings]

FIG. 1 is a configuration block diagram showing an embodiment of the present invention.

FIG. 2 is a waveform diagram illustrating the operation of the device of FIG.

FIG. 3 is a configuration block diagram showing a modified example of the present invention.

FIG. 4 is an explanatory diagram of a communication line considering the convenience of construction.

[Explanation of symbols]

 10 voice input means 20 voice modulation circuit 30 transmitter 40 digital communication line 50 receiver 60 voice demodulation circuit 70 voice output means

Claims (1)

[Claims] 1. A voice input means (10) for converting voice into a digital signal, and a code storage means (2) for code-compressing and storing the signal digitized by the voice input means.
0), a transmitting station having a transmitting device (30) for outputting the code signal accumulated in the code storing means to the communication line (40), and a receiving device for receiving the code signal sent from this communication line ( 50), a voice demodulation circuit (60) for demodulating the code signal received by the receiving device into a voice signal, and a voice output means (70) for converting the signal demodulated by the voice demodulation circuit into sound pressure. A voice transmitting device comprising a station, wherein the communication line is shared with an air conditioning control digital communication line.