JP6646239B2 - Wireless communication system, wireless device, wireless communication method, method of generating packet, and method of reproducing data from packet - Google Patents

Description

  The present invention relates to a wireless communication system employing digital voice communication, a wireless device used in the system, a wireless communication method corresponding to the system, a method of generating a packet, and a method of reproducing data from the packet.

  In recent years, digitization and networking of voice communication are becoming widespread in the world of amateur radio and the like in order to realize higher-speed communication and enjoy communication with clear voice. In a wireless communication system employing this digital voice communication, a voice signal is encoded, converted into a digital signal, packetized, and transmitted (for example, see Patent Document 1).

  In the above-described wireless communication system, analog wireless communication such as performing communication by specifying a partner station in accordance with the addition of data indicating a call destination and a call sign of a source in a header portion of a packet. Many functions that could not be achieved with the system can now be realized.

  Further, in the above-described wireless communication system, data for voice communication and data for data communication are simultaneously transmitted by repeating a voice frame and a data frame of a predetermined length continuously and alternately following the header portion. can do.

  Therefore, if this function is used, for example, an image signal captured by a camera can be transmitted from one wireless device to the other wireless device and displayed on a display while performing communication, and a conversation can be enjoyed while viewing the image. Can also.

JP 2006-157477 A

  However, since the above-described conventional wireless communication system is based on voice communication, the amount of data that can be transmitted for data communication is set to be smaller than the amount of data for voice communication. Since the communication speed is not always fast, improvement has been demanded.

  The present invention has been made in view of such circumstances, and has as its object to provide a wireless communication system that can increase the communication speed of data communication.

To achieve the above object, a wireless communication system according to the present invention includes at least two wireless devices. The wireless device converts an analog audio signal into a digital audio signal by A / D conversion and encoding, Generates a packet including the digital audio signal, further converts the packet into a wireless signal and transmits the packet, receives the packet converted to a wireless signal, extracts the digital audio signal from the packet, and converts the packet into an analog audio signal. A wireless communication system capable of conversion,
Each of the radios,
As the packet, a packet is generated in which a header portion includes at least data of an identifier for identifying a transmission destination and a transmission source wireless station, and a voice portion and a data frame of a predetermined length are arranged alternately and continuously in a data portion. A transmitting unit to perform
A receiving unit that reproduces a packet from the received wireless signal and extracts a digital audio signal from the packet;
A controller instructing the transmission unit to generate a packet, and instructing the reception unit to reproduce a packet from the received radio signal,
An operation unit that includes a PTT switch for switching between transmission and reception, and transmits a user's instruction to the controller;
When performing communication in the fast data mode in which data for data communication is inserted and transmitted instead of a digital audio signal in the audio frame,
According to the instruction of the controller, the transmission unit of the transmission-side wireless device inserts data for data communication into the voice frame and the data frame, and further inserts data for data communication into the voice frame in the data frame. A packet with information indicating that the
When the PTT switch is pressed during the communication in the fast data mode, the controller transmits to the transmission unit a communication mode to a slow data mode in which audio signal data is inserted into the audio frame and transmitted. Command to switch,
The transmitting unit inserts data of an audio signal into the audio frame, inserts data for data communication into the data frame, and further specifies a data type in the data frame according to an instruction to switch a communication mode by the controller. Generate a packet with the information
The controller of the receiving wireless device that has received the wireless signal analyzes the information inserted in the data frame of the packet reproduced by the receiving unit, and determines in which communication mode the packet was transmitted. Confirmed,
If the packet is transmitted in the fast data mode, instruct the receiving unit to extract data for data communication from the voice frame and the data frame of the packet,
When the packet is transmitted in the slow data mode, the receiving unit instructs the receiving unit to extract audio signal data from the audio frame of the packet and extract data for data communication from the data frame. It is characterized by doing.

  Here, the transmission unit, when instructed by the controller to switch the communication mode to the slow data mode, waits for a break between data communication data blocks, and inserts a digital audio signal into the audio frame. Is preferred.

  In the data frame, a mini header describing information indicating the type of data is inserted, and the information indicating that data for data communication is inserted in the voice frame is the information of the information indicating the type of data. It is preferable that one is described in the mini header.

  Note that, when the controller receives data for data communication from an external device or a device built in the wireless device in a state where the PTT switch is not pressed, the controller transmits communication in the first data mode to the transmitting unit. It may be instructed.

  It is preferable that the operation unit is provided with a mode switching unit that can select either the slow data mode or the fast data mode.

  Further, the present invention includes a wireless device realizing the above wireless communication system, a wireless communication method corresponding to the above wireless communication system, a method of generating a packet, and a method of reproducing data from the packet.

  When the wireless communication system according to the present invention is employed, the communication speed of data communication can be increased, so that data for data communication can be transmitted at a higher speed than in a conventional wireless communication system.

  Further, since the operation by the PTT switch is prioritized, even during communication in the fast data mode, the user can start communication at any time by pressing the PTT switch, and as a result, the data communication can be started. High speed and voice communication can be compatible.

FIG. 2 is a block diagram illustrating a configuration of the wireless device according to the embodiment of the present invention. FIG. 3 is a diagram illustrating a configuration of a packet transmitted by the wireless device. FIG. 3 is a diagram illustrating types of data inserted into each frame of a data portion of a packet. 9 is a flowchart illustrating a flow of processing in the controller from the start of packet transmission to the stop thereof in the fast data mode. FIG. 3 is a diagram illustrating types of data inserted into a packet in the same mode. 9 is a flowchart illustrating a flow of processing in a controller of a wireless device that has received a packet.

  Hereinafter, a wireless communication system according to an embodiment of the present invention will be described with reference to the drawings.

<Means for increasing the communication speed of data communication>
First, means for increasing the communication speed of data communication employed in the present invention will be described. According to the present invention, the communication speed of data communication is increased by inserting data for data communication into an audio frame used for transmitting data of an audio signal and transmitting the data.

  In the following description, the communication mode in which the audio signal data is inserted into the audio frame is referred to as “slow data mode”, and the data for data communication is inserted into the audio frame based on the difference in the communication speed of the data communication. This communication form is called “fast data mode”.

  By the way, when transmission is performed in the first data mode of the above two communication modes, no sound is reproduced on the receiving side, so that a silent state is set. Therefore, when a device displaying communication data is not connected to the wireless device, it cannot be determined whether communication is being performed in the fast data mode or silent communication is being performed.

  Furthermore, when a packet in the fast data mode is received by a conventional wireless device that does not support the fast data mode, data for data communication cannot be reproduced from the packet, and thus there is a possibility that the packet is erroneously recognized as silent communication.

  For this reason, in the present embodiment, in the first data mode, a beep sound is output at regular intervals from the speaker of the wireless device that has received the wireless signal, so that the user is informed that communication is being performed in the first data mode. Informing.

  Therefore, the user of the wireless device (the other station) that has received the wireless signal can easily confirm that communication in the first data mode is being performed from the periodically output beep sound. This effect is particularly effective when a wireless device that does not support the fast data mode receives a wireless signal in the fast data mode.

<Configuration of wireless device>
Next, a radio used in the radio communication system according to the present embodiment will be described with reference to FIG. The wireless device 1 includes a microphone 11, a speaker 12, an AF amplifier 13, an audio codec 14, a transmission unit 15, a transmission / reception switching unit 16, an antenna 17, a reception unit 18, an interface unit 19, a controller 21, an operation unit 26, and a display unit 28. It is configured. In the figure, thick arrows indicate flows of audio signals and data, and thin arrows indicate flows of signals of the control system.

  The microphone 11 receives an audio signal for transmission, generates an analog audio signal, and outputs the audio signal to the AF amplifier 13. On the other hand, the speaker 12 converts the analog audio signal output from the AF amplifier 13 into audio.

  The AF (Audio Frequency) amplifier 13 amplifies the analog audio signal input from the microphone 11 and supplies the amplified analog audio signal to the audio codec 14. Further, it amplifies the analog audio signal of the received audio supplied from the audio codec 14 and outputs the amplified signal to the speaker 12.

  The audio codec 14 A / D (analog / digital) converts and encodes the analog audio signal supplied from the AF amplifier 13 and outputs the signal to the transmission unit 15. The audio codec 14 also decodes the digital audio signal supplied from the receiving unit 18, further performs D / A (digital / analog) conversion, and outputs the result to the AF amplifier 13.

  The transmission unit 15 attaches a wireless communication header to the digital audio signal supplied from the audio codec 14 and generates a transmission packet shown in FIG. 2 based on an output of a PTT switch 27 described later. The configuration of the packet will be described later in detail with reference to FIG. The transmitting unit 15 further modulates a carrier with digital data constituting a packet, and transmits the modulated signal from the antenna 17 via the transmission / reception switching unit 16.

  The transmission / reception switching unit 16 guides the transmission signal from the transmission unit 15 to the antenna 17 when the PTT switch 27 is pressed and turned on, and guides the reception signal of the antenna 17 to the reception unit 18 when the PTT switch 27 is released and turned off. .

  The receiving unit 18 switches the receiving frequency in accordance with the instruction signal from the controller 21, amplifies the received signal obtained by tuning to the receiving frequency, and further demodulates the packet to reproduce the packet. Then, the header portion is removed from the reproduced packet, the audio data is supplied to the audio codec 14, and the other data (for example, packet data such as an image signal) is supplied to the interface unit 19.

  The interface unit 19 is connected to an external device (not shown) (for example, a personal computer or a smartphone) via an external connection terminal 20, and supplies packet data such as an image signal supplied from the external device to the transmission unit 15 and the controller 21. The interface unit 19 supplies the packet data supplied from the receiving unit 18 to an external device via the external connection terminal 20.

  The controller 21 controls the operation of the wireless device 1. The controller 21 includes a CPU (Central Processing Unit) 22, a ROM (Read Only Memory) 23 storing a program that defines the operation of the CPU 22, a RAM (Random Access Memory) 24 functioning as a work memory of the CPU 22, and a call sign. A non-volatile memory 25 for storing data is provided.

  The operation unit 26 transmits various inputs and user instructions to the controller 21. The operation unit 26 includes a PTT (Push To Talk) switch 27. When the PTT switch 27 is pressed (turned on), the transmission / reception switching unit 16 is switched to the transmission side to perform transmission from the antenna 17, and when released (turned off), the transmission / reception switching unit 16 is switched to the reception side to receive. The reproduced audio signal is reproduced.

  The display unit 28 includes a liquid crystal display or the like, and is used to display various data. On the screen of the display unit 28, the fact that the radio device 1 has received an amateur radio signal (there is a call), the call sign of the transmission source (own station) and the transmission destination (the other station), a nickname, and the like are displayed. You.

  The wireless device 1 according to the present embodiment includes an audio encoder 29 that is a beep sound generating unit, in addition to the general-purpose components described above. The voice encoder 29 generates code data of a beep sound that is a notification sound to the user, generates a beep sound according to an instruction of the controller 21, and outputs the data to the transmission unit 15.

<Packet configuration>
Next, a configuration of a packet generated by the transmission unit 15 will be described with reference to FIGS. The configuration of the packet indicates how to transmit a series of data of digital voice communication in a certain order and how.

  As shown in FIG. 2, the packet Pa is composed of a header Ph and a data Pd. The header Ph includes a synchronization signal h1, a flag h2, a call sign h3 of a destination repeater, a call sign h4 of a source repeater, a destination call sign h5, and a source call sign h6.

  The synchronization signal h1 in the header Ph synchronizes the received signal and indicates that it is a signal. The flag h2 is data representing communication via a repeater, direct communication, a repeater control signal, and the like, and is composed of a plurality of bits of data.

  The call sign h3 of the destination repeater is, for example, the call sign of the repeater station in the repeater area to which the destination wireless station belongs, and the call sign h4 of the source repeater is the call sign of the repeater station in the repeater area to which the source wireless station belongs. It is. The destination call sign h5 is the call sign of the transmitting station, and the source call sign h6 is the call sign of the own station. These call signs (h3 to h6) serve as identifiers for identifying the destination and source wireless stations and the repeater station that relays the wireless signal. The destination call sign h5 may be a CQ that calls an unspecified station.

  The data portion Pd includes a voice frame d1 of a predetermined length into which a digitized voice signal is inserted and a data frame for data communication such as an image signal and a message so that voice communication data and data communication data can be transmitted simultaneously. Are inserted alternately, and the end frame d3 indicating the end of the packet is added at the end.

  The data frame d2 is replaced at regular intervals (for example, 420 mS) by a resynchronization frame d4 in which a synchronization signal for synchronizing with the wireless device of the transmission partner station is inserted.

  Next, data for data communication inserted into the data frame d2 will be described with reference to FIG. FIG. 3 shows the types of data inserted into each frame of the data part Pd. In the figure, “voice” indicates that data of a voice signal is inserted in the frame, and “data” indicates that data for data communication is inserted in the frame.

  In the audio frame d1 and the data frame d2 constituting the data portion Pd, the data amount of the audio frame d1 is set to be larger than the data amount of the data frame d2 because the transmission of the audio signal is prioritized. Normally, 9-byte data is inserted into the audio frame d1, and 3-byte data is inserted into the data frame d2.

  Further, a mini header d5 describing the type of data and the like is inserted at the head of the data frame d2. However, if the mini header d5 is provided for each data frame, the amount of data that can be inserted into the data frame is reduced. Therefore, one mini header d5 is usually inserted for every two data frames.

  Therefore, when generating the packet Pa, as shown in the lower part of FIG. 3, the communication data for data communication is divided into 5 bytes, and a 1-byte mini-header d5 is added to the beginning of the data to form a data block. After this, this data block is divided into three bytes and inserted into two adjacent data frames d2.

  In the mini header d5, information indicating the data type and the data length is described. The data length indicates the effective data length inserted in one data block. For example, consider the case of transmitting general-purpose data such as an image having a data length of 13 bytes. First, as described above, when data to be transmitted is divided into five bytes, the data is divided into five bytes, five bytes, and three bytes. Then, a mini header d5 is added to the head of each of the divided data. Here, if the information indicating general-purpose data such as an image is, for example, 0x3, the mini header d5 of the first and second data blocks is 0x35, and the mini header d5 of the third data block is 0x33. Become.

  The controller 21 (see FIG. 1) extracts data indicating the data type and the like from the data for data communication transmitted from an external device (not shown) connected to the terminal 20 via the interface unit 19, and To be stored. When the transmitting unit 15 generates a packet for transmission, the data is read from the RAM 24 and transferred to the transmitting unit 15. Information indicating the data type of the transferred data is written in the mini header d5.

  On the other hand, when the data for data communication is reproduced from the packet Pa reproduced by the receiving unit 18, the processing reverse to that described above, that is, the data included in the two data frames d 2 based on the information of the mini header d 5 , The communication data of 5 bytes is taken out, and they are connected to reproduce data for data communication, and transmitted to an external device via the interface unit 19.

<Communication operation in slow data mode>
As described above, the wireless device according to the present embodiment can perform communication in two modes, the slow data mode and the fast data mode. First, the communication operation in the slow data mode will be described with reference to FIGS.

  Although not shown, the operation unit 26 is provided with a switch as mode switching means for switching the communication mode, and the user can select either the slow data mode or the fast data mode by switching the switch. The slow data mode is selected when performing communication with a conventional wireless device for which a communication mode cannot be selected or when there is no data for data communication to be transmitted. The mode switching means may switch the mode from a menu screen displayed by pressing a menu button or the like instead of a switch.

  Hereinafter, as a typical case in the slow data mode, a case where a wireless device (own station) in an arbitrary area calls a wireless station (other station) in a different area will be described.

  Prior to communication, the user operates the operation unit 26 of the wireless device 1 to store information necessary for communication, for example, a call sign of a transmission source (own station) and a call sign of a repeater station in the nonvolatile memory 25. .

  At the time of communication, the user operates the operation unit 26 of the wireless device 1 to specify a call sign given to the wireless station of the transmission destination and a call sign of the destination repeater to instruct a call.

  When the user presses the PTT switch 27, information input from the operation unit 26 is notified to the transmission unit 15 by the controller 21, and a packet is generated by the transmission unit 15 according to an instruction from the controller 21. As shown in FIG. 2, in the header Ph of the packet Pa, the call sign h3 of the destination repeater, the call sign h4 of the source repeater, the call sign h5 of the destination (opposite station), and the call sign h5 of the source (own station) are included. Each piece of information of the call sign h6 is included.

  On the other hand, the data of the audio signal output from the audio codec 14 is inserted into the audio frame d21 of the data portion Pd in the packet Pa, and the data for data communication transferred from the interface unit 19 is inserted into the data frame d2 in the data frame d2. Inserted.

  The packet Pa generated by the transmission unit 15 and converted into a wireless signal is transmitted via the transmission / reception switching unit 16 and the antenna 17. The packet Pa transmitted from the wireless device 1 (own station) is relayed by the designated repeater station and reaches the wireless device 1 (counter station).

  The wireless signal received by the wireless device 1 (the other station) is supplied to the receiving unit 18 via the antenna 17 and the transmission / reception switching unit 16, and is demodulated by the receiving unit 18 to reproduce the packet Pa. Further, the header Ph is removed from the packet Pa reproduced by the receiving unit 18 and supplied to the audio codec 14 or the interface unit 19 according to the content of the data unit Pd.

  The data of the audio signal supplied to the audio codec 14 is decoded, further converted into an analog audio signal, and supplied to the AF amplifier 13. The audio signal amplified by the AF amplifier 13 is output from the speaker 12, and the voice of the transmission source user is reproduced.

  On the other hand, data for data communication obtained by demodulating the packet shown in FIG. 3 is transferred to an external device (not shown) via the interface unit 19.

  Further, the packet Pa reproduced by the receiving unit 18 is supplied to the controller 21. The CPU 22 of the controller 21 determines whether the received packet Pa is a valid packet by checking an ECC (Error Check Code) or the like.

  The CPU 22 stores the data of the header Ph of the packet Pa determined to be valid in the RAM 24 and analyzes the information of the header Ph. The CPU 22 displays the destination callsign and the source callsign of the received packet Pa on the display unit 28 based on the analysis result.

<Communication operation in fast data mode>
Next, the communication operation in the first data mode will be described with reference to FIGS. 4 and 5 and FIGS. As described above, in the wireless communication system according to the present embodiment, communication is performed in the first data mode by outputting a beep sound at regular intervals from the speaker 12 of the wireless device 1 that has received the wireless signal. To the user.

  FIG. 4 shows a flow of processing in the controller 21 from the start of transmission of the packet Pa in the fast data mode to the stop thereof. FIG. 5 shows the type of data inserted into the packet Pa generated by the receiving unit 15 during the same period.

  Operations performed by the user prior to communication, such as storing information necessary for communication in the non-volatile memory 25 and designating a destination call sign and a call sign of a destination repeater, are the same as those in the slow data mode. Therefore, the description is omitted.

  There are two ways to switch to the fast data mode. The first method is a method of switching the mode changeover switch (not shown) of the operation unit 26 to the fast data mode. This is performed, for example, when transmitting data for data communication stored in an external device.

  The second method is that, in a state where the user does not press down the PTT switch 27, that is, in a state where transmission of an audio signal is not instructed, data for data communication is built in an external device or a wireless device such as a GPS receiver. This is a method in which the controller 21 detects the transmission from the device to the interface unit 19 and automatically switches to the first data mode.

  In either case, the controller 21 transmits a command to start transmission in the fast data mode to the transmission unit 15 (step S1).

  The transmitting unit 15 that has received the command to start transmission from the controller 21 starts generating the packet Pa. Specifically, as shown in FIG. 5, the transmitting unit 15 generates a packet in which data for data communication is inserted into each of the voice frame d1 and the data frame d2. The generated packet Pa is further converted to a high-frequency signal by the transmission unit 15 and transmitted from the antenna 17 as a wireless signal.

  When the fast data mode is selected by the second method, the radio signal is complicated by performing carrier sense for checking whether the transmission channel is being used by another station before transmitting the radio signal. Is preventing that.

  As described above with reference to FIG. 3, in the communication in the slow data mode, that is, in the communication mode in which the data of the audio signal is inserted into the audio frame, when the audio communication and the data communication are performed simultaneously, the audio frame d1 , 9 bytes of audio signal data are inserted. On the other hand, for data for data communication, a communication data d6 divided every 5 bytes and a data block composed of a mini header d5 added to the head thereof are divided into two and inserted into two data frames d2.

  On the other hand, in the communication in the first data mode, that is, in a communication mode in which data for data communication is inserted into a voice frame, when only data for data communication is transmitted using a voice frame and a data frame, the data to be transmitted is After being divided into every 20 bytes, a mini header d5 and the like are added to form a block, and the data of this block is divided and inserted into two adjacent audio frames d1 and two data frames d2.

  Specifically, the block is composed of 20 bytes of data for data communication, 1 byte of mini-header, 2 bytes of unique data inserted into each audio frame for noise reduction, and erroneous detection of packet loss. The data frame is composed of 1 byte data inserted into the data frame, that is, a total of 24 bytes of data. These data are composed of two adjacent voice frames d1 (9 bytes × 2) and two data frames d2 (3 bytes × 2) Is divided and inserted.

  Comparing the case where voice signal data is inserted into the voice frame d1 of the packet Pa and the case where data communication data is inserted, the communication speed of data communication in the latter is about 3.5 times that of the former. Therefore, data for data communication can be transmitted at high speed.

  Returning to the description of FIG. 4, when the first time T1 has elapsed since the transmission of the command instructing the transmission unit 15 to start transmission (Yes in step S2), the controller 21 Then, a command instructing generation of the beep sound code data is transmitted, and further, a command instructing insertion of the beep sound code data into the voice frame d1 is transmitted to the transmission unit 15 (step S3). Here, the first time T1 indicates a repetition interval of the beep sound.

  As shown in FIG. 5, the transmitting unit 15, which has received the command for instructing insertion of the beep sound from the controller 21, waits for a break between data communication data blocks, and outputs the beep sound data output from the voice encoder 29. Is inserted into the audio frame d1.

  After transmitting a command instructing insertion of a beep sound to the transmission unit 15, the controller 21 transmits the first data to the transmission unit 15 when a second time T2 shorter than the first time T1 has elapsed (Yes in step S <b> 4). A command to return to the mode is transmitted, and a command to stop generation of the beep sound is transmitted to the voice encoder 29 (step S5). Here, the second time T2 indicates a time during which a beep is sounding.

  Thereafter, the transmitting unit 15 returns to the original form and generates a packet in which data for data communication is inserted into each of the voice frame d1 and the data frame d2.

  Next, the controller 21 checks the reception status of the data for data communication in the interface unit 19 (step S6). If the data is continuously received (No in the same step), the controller 21 proceeds to the process of step S2. Returning to each of the first time periods T 1, a beep sound insertion instruction command is transmitted to the transmission unit 15, and a beep generation instruction command is repeatedly transmitted to the speech encoder 29.

  On the other hand, when the reception of the data for data communication in the interface unit 19 is not interrupted (Yes in step S6), the controller 21 transmits a command for instructing the transmission unit 15 to stop the transmission (step S6). S7). The transmission unit that has received the transmission stop instruction command inserts the end frame d3 into the packet Pa and stops generation and transmission of the packet, as shown in FIG.

  Although not shown in the flowchart of FIG. 4, when the user presses the PTT switch 27 during the communication in the fast data mode, the operation by the PTT switch 27 has priority, and the controller 21 And switches the communication mode to the slow data mode.

  Specifically, the controller 21 transmits, to the transmission unit 15, a command instructing transmission in the slow data mode, that is, insertion of a digital audio signal into the audio frame d1.

  Upon receiving this command, the transmitting unit 15 waits until a break between data communication data blocks, and inserts the digital audio signal supplied from the audio codec 14 into the audio frame d1. As a matter of course, in the slow data mode, no beep sound is inserted into the packet Pa.

  Next, a description will be given of a method of reproducing data in the wireless device (the other station) that has received the wireless signal created by the procedure shown in FIG. 4 and transmitted from the wireless device (the own station). The controller 21 performs a process of reproducing the received data according to the flow shown in FIG.

  The controller 21 fetches the data of the data frame d2 from the data of the packet Pa reproduced from the wireless signal by the receiving unit 18 into a built-in register (not shown) (step S11), analyzes the information of the mini-header, It is confirmed whether or not the packet Pa is transmitted in the fast data mode (step S12).

  As shown in FIG. 5, in the communication in the fast data mode, the audio frame d1 after the second time T2 has elapsed at the beginning of the data portion of the packet Pa and the first time T1 includes data communication data. Data has been inserted.

  When the controller 21 confirms that data for data communication has been inserted into the voice frame d1 (Yes in step S13), the controller 21 instructs the receiving unit 18 to reduce the abnormal noise from the voice frame d1 (this embodiment). In step S14, an instruction is issued to extract the data for data communication (8 bytes) excluding 1 byte (step S14).

  Subsequently, the controller 21 reproduces data for data communication by connecting the data extracted from the two adjacent voice frames d1 and two data frames d2 in the reverse order of the above-described block creation ( Step S15). The reproduced data for data communication is output to the interface unit 19.

  The controller 21 instructs the interface unit 19 to transfer the reproduced data for data communication to the external device, and the interface unit 19 outputs the reproduced data for data communication to the external device in accordance with the instruction. I do. The data for data communication whose communication speed has been increased in this way is transmitted to the external device.

  On the other hand, as shown in FIG. 5, a beep sound signal is inserted in the sound frame d1 of the packet Pa until the second time T2 elapses at the first time T1. When the controller 21 confirms that the beep data is inserted into the audio frame d1 (No in step S13), the controller 21 instructs the receiving unit 18 to output the beep data included in the audio frame d1 (this embodiment). (9 bytes) (step S17).

  Next, the controller 21 instructs the audio codec 14 to decode the beep data extracted from the receiving unit 18 (step S18), and the audio codec 14 decodes the beep according to the instruction of the controller 21. Perform the conversion process. The beep sound that has been decoded and further converted to an analog audio signal is output from the speaker 12.

  The user of the wireless device 1 (the other station) that has received the wireless signal can confirm that communication in the first data mode is being performed from the beep sound that is periodically output at intervals of the time T1. This effect is particularly effective when a wireless device that does not support the fast data mode receives a wireless signal in the fast data mode.

  In parallel with the processing in steps S17 and S18, the controller 21 connects the data extracted from the data frame d2 and stored in the register to reproduce data for data communication (step S19). The reproduced data for data communication is output to the interface unit 19.

  Subsequently, the controller 21 instructs the processing in the above-described step S16, that is, instructs the interface unit 19 to transfer the reproduced data for data communication to an external device. Outputs communication data to an external device.

  In the above-described embodiment, the first time T1 of repeating the beep sound is preferably about 1 second. Also, as for the second time T2 for outputting the beep sound, if it is too long, the communication speed of data communication is reduced, and if it is too short, it becomes difficult to hear the beep sound. preferable.

  Further, in the above-described embodiment, the sound encoder 29 is used to generate the beep sound, but the means for generating the beep sound is not limited to this. The data of the beep sound signal itself may be stored in the non-volatile memory 25, and the controller 21 may read the data and transmit the data to the transmission unit 15 during the second time T2.

Reference Signs List 1 radio 11 microphone 12 speaker 13 AF amplifier 14 audio codec 15 transmission unit 16 transmission / reception switching unit 17 antenna 18 reception unit 19 interface unit 21 controller 25 non-volatile memory 26 operation unit 27 PTT switch 28 display unit 29 audio encoder Pa packet Ph Head part Pd data part

Claims (16)

The wireless device is configured to convert the analog audio signal into a digital audio signal by A / D conversion and encoding, generate a packet including the digital audio signal, and further generate the packet including the digital audio signal. A wireless communication system capable of converting and transmitting a wireless signal, receiving a packet converted into a wireless signal, extracting a digital audio signal from the packet and converting the digital audio signal into an analog audio signal,
Each of the radios,
As the packet, a packet is generated in which a header portion includes at least data of an identifier for identifying a transmission destination and a transmission source wireless station, and a voice portion and a data frame of a predetermined length are arranged alternately and continuously in a data portion. A transmitting unit to perform
A receiving unit that reproduces a packet from the received wireless signal and extracts a digital audio signal from the packet;
A controller instructing the transmission unit to generate a packet, and instructing the reception unit to reproduce a packet from the received radio signal,
An operation unit that includes a PTT switch for switching between transmission and reception, and transmits a user's instruction to the controller;
When performing communication in the fast data mode in which data for data communication is inserted and transmitted instead of a digital audio signal in the audio frame,
According to the instruction of the controller, the transmission unit of the transmission-side wireless device inserts data for data communication into the voice frame and the data frame, and further inserts data for data communication into the voice frame in the data frame. A packet with information indicating that the
When the PTT switch is pressed during the communication in the fast data mode, the controller transmits to the transmission unit a communication mode to a slow data mode in which audio signal data is inserted into the audio frame and transmitted. Command to switch,
The transmitting unit inserts data of an audio signal into the audio frame, inserts data for data communication into the data frame, and further specifies a data type in the data frame according to an instruction to switch a communication mode by the controller. Generate a packet with the information
The controller of the receiving wireless device that has received the wireless signal analyzes the information inserted in the data frame of the packet reproduced by the receiving unit, and determines in which communication mode the packet was transmitted. Confirmed,
If the packet is transmitted in the fast data mode, instruct the receiving unit to extract data for data communication from the voice frame and the data frame of the packet,
When the packet is transmitted in the slow data mode, the receiving unit instructs the receiving unit to extract audio signal data from the audio frame of the packet and extract data for data communication from the data frame. A wireless communication system, comprising:   The transmission unit, when instructed by the controller to switch the communication mode to the slow data mode, waits until a block of data for data communication, and inserts a digital audio signal into the audio frame. Item 2. The wireless communication system according to item 1. In the data frame, a mini header describing information indicating the type of data is inserted,
The wireless communication system according to claim 1, wherein information indicating that data for data communication is inserted in the voice frame is described in the mini header as one of information indicating a type of the data.   The controller instructs the transmission unit to perform communication in the first data mode when receiving data for data communication from an external device or a device built in the wireless device in a state where the PTT switch is not pressed. The wireless communication system according to claim 1, wherein:   4. The wireless communication system according to claim 1, wherein the operation unit includes a mode switching unit that can select one of the slow data mode and the fast data mode. 5. A wireless device that A / D converts and encodes an analog audio signal into a digital audio signal, generates a packet including the digital audio signal, further converts the packet into a wireless signal, and transmits the wireless signal.
As the packet, a packet is generated in which a header portion includes at least data of an identifier for identifying a transmission destination and a transmission source wireless station, and a voice portion and a data frame of a predetermined length are arranged alternately and continuously in a data portion. A transmitting unit to perform
A controller for instructing the transmission unit to generate a packet,
An operation unit that includes a PTT switch for switching between transmission and reception, and transmits a user's instruction to the controller;
When performing communication in the fast data mode in which data for data communication is inserted and transmitted instead of a digital audio signal in the audio frame,
The transmitting unit inserts data for data communication in the voice frame and the data frame according to the instruction of the controller, and further indicates that data for data communication is inserted in the voice frame in the data frame. Generate a packet with information inserted,
When the PTT switch is pressed during the communication in the fast data mode, the controller transmits to the transmission unit a communication mode to a slow data mode in which audio signal data is inserted into the audio frame and transmitted. Command to switch,
The transmitting unit inserts data of an audio signal into the audio frame, inserts data for data communication into the data frame, and further specifies a data type in the data frame according to an instruction to switch a communication mode by the controller. A wireless device for generating a packet in which information indicating the information is inserted.   The transmission unit, when instructed by the controller to switch the communication mode to the slow data mode, waits until a block of data for data communication, and inserts a digital audio signal into the audio frame. Item 7. The wireless device according to Item 6. In the data frame, a mini header describing information indicating the type of data is inserted,
8. The wireless device according to claim 6, wherein information indicating that data for data communication is inserted in the voice frame is described in the mini header as one of information indicating a type of the data.   The controller, when receiving data for data communication from an external device or a built-in device in a state where the PTT switch is not pressed, instructs the transmission unit to perform communication in the first data mode. The wireless device according to any one of claims 6 to 8.   The wireless device according to claim 6, wherein the operation unit includes a mode switching unit that can select one of the slow data mode and the fast data mode. A receiving unit that reproduces the packet from the received wireless signal, and extracts a digital audio signal from the packet,
The controller analyzes the information inserted in the data frame of the packet reproduced by the receiving unit, and confirms in which communication mode the packet is transmitted,
If the packet is transmitted in the fast data mode, instruct the receiving unit to extract data for data communication from the voice frame and the data frame of the packet,
When the packet is transmitted in the slow data mode, the receiving unit instructs the receiving unit to extract audio signal data from the audio frame of the packet and extract data for data communication from the data frame. The wireless device according to any one of claims 6 to 10 , wherein It is composed of at least two radios, and the radios are
A transmitting unit for generating a packet in which at least the data of the identifier for identifying the transmission destination and the transmission source radio station is included in the header part, and the voice part and the data frame of the predetermined length are arranged alternately and continuously in the data part; ,
A receiving unit from the non-linear signal received by reproducing the packet, and retrieve the digital audio signal from the packet,
A controller instructing the transmission unit to generate a packet, and instructing the reception unit to reproduce a packet from the received radio signal,
An operation unit that includes a PTT switch for switching between transmission and reception, and transmits a user's instruction to the controller;
Each of the wireless devices converts an analog audio signal into a digital audio signal by A / D conversion and encoding, generates a packet including the digital audio signal, converts the packet into a radio signal, and transmits the packet. A wireless communication method for receiving a packet converted into a wireless signal, extracting a digital audio signal from the packet, and converting the digital audio signal into an analog audio signal,
When performing communication in the fast data mode in which data for data communication is inserted and transmitted instead of a digital audio signal in the audio frame,
According to the instruction of the controller, the transmission unit of the transmission-side wireless device inserts data for data communication into the voice frame and the data frame, and further inserts data for data communication into the voice frame in the data frame. A packet with information indicating that the
When the PTT switch is pressed during the communication in the fast data mode, the controller instructs the transmission unit to set a communication mode to a slow data mode in which audio signal data is inserted into an audio frame and transmitted. Instruct switching,
The transmitting unit inserts data of an audio signal into the audio frame, inserts data for data communication into the data frame, and further specifies a data type in the data frame according to an instruction to switch a communication mode by the controller. Generate a packet with the information
The controller of the receiving wireless device that has received the wireless signal analyzes the information inserted in the data frame of the packet reproduced by the receiving unit, and determines in which communication mode the packet was transmitted. Confirmed,
If the packet is transmitted in the fast data mode, instruct the receiving unit to extract data for data communication from the voice frame and the data frame of the packet,
When the packet is transmitted in the slow data mode, the receiving unit instructs the receiving unit to extract audio signal data from the audio frame of the packet and extract data for data communication from the data frame. A wireless communication method.   The transmission unit, when instructed by the controller to switch the communication mode to the slow data mode, waits until a block of data for data communication, and inserts a digital audio signal into the audio frame. Item 13. The wireless communication method according to item 12. A transmitting unit for generating a packet in which at least the data of the identifier for identifying the transmission destination and the transmission source radio station is included in the header part, and the voice part and the data frame of the predetermined length are arranged alternately and continuously in the data part; ,
A controller for instructing the transmission unit to generate a packet,
An operation unit that includes a PTT switch for switching between transmission and reception, and transmits a user's instruction to the controller;
The transmitting unit generates a packet including a digital audio signal in which an analog audio signal is A / D converted and encoded, and further converts the packet into a wireless signal and transmits the packet. hand,
When performing communication in the fast data mode in which data for data communication is inserted and transmitted instead of a digital audio signal in the audio frame,
The transmitting unit inserts data for data communication in the voice frame and the data frame according to the instruction of the controller, and further indicates that data for data communication is inserted in the voice frame in the data frame. Generate a packet with information inserted,
When the PTT switch is pressed during the communication in the fast data mode, the controller instructs the transmission unit to set a communication mode to a slow data mode in which audio signal data is inserted into an audio frame and transmitted. Instruct switching,
The transmitting unit inserts data of an audio signal into the audio frame, inserts data for data communication into the data frame, and further specifies a data type in the data frame according to an instruction to switch a communication mode by the controller. A method for generating a packet, the method comprising: generating a packet in which information is inserted.   The transmission unit, when instructed by the controller to switch the communication mode to the slow data mode, waits until a block of data for data communication, and inserts a digital audio signal into the audio frame. Item 15. A method for generating a packet according to Item 14. A receiving unit that receives a wireless signal including a packet generated by the packet generating method according to claim 14 or 15, reproduces the packet from the wireless signal, and extracts a digital audio signal from the packet,
The controller analyzes the information inserted in the data frame of the packet reproduced by the receiving unit, and confirms in which communication mode the packet is transmitted,
If the packet is transmitted in the fast data mode, instruct the receiving unit to extract data for data communication from the voice frame and the data frame of the packet,
When the packet is transmitted in the slow data mode, the receiving unit instructs the receiving unit to extract audio signal data from the audio frame of the packet and extract data for data communication from the data frame. A method for reproducing data from a packet.

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