A communication system for transmitting and listening to sound data via canbus FD protocol

Abstract

The invention relates to an industrial product that enables two or more users working in noisy environments to communicate audibly with each other through cables, using the CAN-Bus FD protocol.

Description

[0001] A COMMUNICATION SYSTEM FOR TRANSMITTING AND LISTENING TO SOUND DATA VIA CANBUS FD PROTOCOL

[0002] TECHNICAL FIELD

[0003] The invention relates to an industrial product that enables two or more users working in noisy environments to communicate audibly with each other through cables, using the CAN-Bus FD protocol.

[0004] BACKGROUND

[0005] In the known state of the art, other products used in the industry for communication transmit audio signals using either analog signals or CANBus (Standard Frame). In the analog versions of this transmission, the sound is affected by external electromagnetic fields and the length of the transmission line, resulting in distorted audio when received by the other user.

[0006] Every device in use today emits some level of electromagnetic radiation. In addition to this, industrial machines — the target application for this invention — contain components such as electric motors and electromagnets, which generate strong magnetic fields. These magnetic fields affect the instantaneous voltage values of analog audio signals, causing distorted transmission that differs from the original sound captured by the microphone. Moreover, analog data transmission is more susceptible to line resistance as cable length increases, compared to digital transmission, significantly affecting communication distance. In products that transmit audio using CAN-Bus (Standard Frame), the limited data packet size reduces the microphone sampling rate, leading to degraded sound quality.

[0007] AIM OF THE INVENTION

[0008] The aim of the invention is to enable the transmission of high-sampling-rate digital audio data from the user to receiving devices without distortion or data scaling. To achieve this, the system utilizes CAN-Bus FD, an advanced version of standard CAN-Bus communication. The CAN-Bus FD communication protocol allows for the transmission of extended audio data, ensuring high-quality and reliable communication.

[0009] Unlike the known state of the art, the CAN-Bus FD protocol allows for the transmission of larger data sizes. To ensure that such high-volume data is transmitted without distortion, it must pass through the processing steps illustrated in the flowchart of Figure 1 on both the transmitting and receiving sides. Accordingly, the invention includes a converter that transforms high-sampling-rate audio data into a format suitable for transmission via CAN-Bus FD to the receiving device. This enables seamless audio communication without data loss or delay, while also preventing interference from external electromagnetic disturbances.

[0010] LIST OF FIGURES

[0011] Figure 1. Flowchart of the Data Converter Structure in the Invention

[0012] DETAILED DESCRIPTION OF THE INVENTION

[0013] The invention relates to a system capable of transmitting audio data using the CAN-Bus FD protocol. The system includes at least one transmitting unit and one receiving unit, with communication occurring between these two units. In one embodiment of the invention, one unit is equipped with audio transmission hardware, while the other unit only contains listening hardware. In another embodiment, both units are equipped with hardware that allows users to both transmit and receive audio, enabling two-way communication.

[0014] In the first embodiment of the invention, the transmitting unit includes a microphone to capture the user's voice, a converter, an MCU (Microcontroller Unit), and data transmission cables. The 16-bit high-sampling-rate audio data received from the microphone is processed by the MCU, where it is transferred to the PDM / PCM (Pulse Density Modulation / Pulse Code Modulation) filter within the MCU. PDM is a digital signal processing technique that reconstructs the signal based on density modulation and can be used to convert digital audio signals into different formats. PCM, on the other hand, is a digital signal encoding method that is commonly used to convert analog audio signals into digital format by sampling the analog signal. The 16- bit audio data is typically encoded in PCM format. This filtering process enhances the processing of incoming digital data. The PDM or PCM filter converts the digital audio data into a more suitable format and can provide noise reduction and other signal enhancements. These filters help ensure that the audio signal remains cleaner and of higher quality. In summary, within the PDM / PCM filter, analog data is converted into digital data. At the filter output, 16-bit, 16-byte-long digital audio data is obtained. To transmit this audio data to the receiving unit, the CAN-Bus FD communication protocol is used, which provides long-distance communication support and minimizes the impact of external interference. In the CAN-Bus FD communication protocol, data must be in 8-bit size. Therefore, to enable the transmission of the filtered audio data using the CAN-Bus FD protocol, the MCU splits the processed audio data into pairs before transmission. As a result of this process, a real-time audio data stream of 8-bit size and 32 bytes in length is obtained. This data is transmitted to the receiving unit via CAN-Bus FD. There may be multiple receiving units. Each receiving device contains a speaker and an MCU. The MCU within the receiving device reverses the splitting process performed by the MCU in the transmitting unit, reassembling the audio data. As a result, the audio data is successfully received as a 16-bit, 16-byte-long audio file. The MCU in the receiving device processes the received data and transmits it to the audio decoder hardware, followed by the audio amplifier hardware within the receiving device. The amplifier hardware operates with analog signals to deliver sound to the listener. The decoder hardware converts the reassembled digital data from the MCU into analog audio signals and sends them to the amplifier for output. The digital audio data generated by the microcontroller (MCU) consists of a sequence of numbers sampled at a specific frequency over time. For example, an audio signal can be sampled at frequencies such as 44.1 kHz or 48 kHz per second. The digital signal represents the amplitude of the sound wave at specific time intervals using these numerical sequences. The decoder hardware converts this numerical data into a continuous electrical signal. During this process, each digital data point is transformed into a specific voltage level, creating a continuous analog signal. The resolution of the decoder hardware (e.g., 8-bit, 16-bit, or 24-bit) determines how accurately the signal is represented. A higher bit depth provides greater precision and accuracy in audio reproduction. The converted analog audio signal is then sent to the amplifier hardware, which amplifies the signal before transmitting it to the speaker within the receiving unit. The speaker then delivers the sound to the listener(s) in real time. These steps occur instantly and in real time, ensuring minimum delay and maximum audio quality, thus completing the voice communication process efficiently.

[0015] In the second embodiment of the invention, both the transmitting unit and the receiving unit contain all the hardware components described above. This means that both the transmitting unit and the receiving unit are equipped with a microphone, allowing them to transmit audio, while also being capable of receiving and playing back the transmitted sound. Additionally, there can be multiple transmitting and receiving units within the system, enabling multi-user communication.

Claims

CLAIMS1. A communication system for transmitting and listening to audio data, characterized by comprising:- A CANBUS FD protocol for data transmission between the transmitting and receiving units,- At least one transmitting unit and at least one receiving unit that communicate with each other, wherein the transmitting unit further comprises a microphone, an MCU comprising a PDM / PCM filter for processing the audio captured by the microphone and converting it into digital data and splitting the filtered digital data into two parts for transmission via a CANBUS FD protocol, wherein the receiving unit further comprises a speaker, an MCU that reassembles the split audio data received from the transmitting unit, a decoder hardware that converts the reassembled digital data into analog audio, and an amplifier hardware that amplifies the converted analog audio for transmission to the speaker within the receiving unit.

2. The communication system for transmitting and listening to audio data according to claim 1 , characterized by comprising the PDM / PCM filter that converts the analog audio data received from the microphone into 16-bit digital audio data with a length of 16 bytes.

3. The communication system for transmitting and listening to audio data according to claim 1 , characterized by comprising an MCU that converts the 16-bit, 16-byte digital audio data output from the PDM / PCM filter into 8-bit, 32- byte real-time audio data to enable transmission via the CANBUS FD protocol.

4. The communication system for transmitting and listening to audio data according to claim 1 , characterized by comprising the transmitting unit that includes the speaker, the MCU that reassembles the split audio data, the decoder hardware that converts the reassembled digital data into analog audio, and the amplifier hardware that amplifies the converted analog audio for transmission to the speaker.

5. The communication system for transmitting and listening to audio data according to claim 4, characterized by comprising the receiving unit thatincludes the microphone, the MCU containing the PDM / PCM filter for processing the audio captured by the microphone and converting it into digital data, and the MCU that splits the filtered digital data into two parts for transmission via the CANBUS FD protocol.

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