JP2010226168A - Radio communication equipment and program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve the performance for recognizing a tone pattern of a DTMF code. <P>SOLUTION: Radio communication equipment includes a vocoder part FEC decoding part 15 which makes error corrections on data when decoding data at predetermined time intervals, a vocoder part code detection part 16 which decides whether the DTMF code is detected from the error-corrected data at predetermined time intervals and outputs the decision result, a vocoder FEC error acquisition part 15A which acquires the number of errors of the data from the result of the error correction, a non-detection succession frequency setting part 15B which sets a non-detection succession frequency based upon the acquired number of the errors, and a DTMF coincidence decision part 18 which compares a non-detection succession frequency indicative of the succession frequency of the DTMF code which is not detected by the vocoder FEC code detection part 16 with the set non-detection succession frequency and decides the tone pattern of the DTMF code based upon the comparison result. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a wireless communication device and a program.

  Conventionally, in the field of wireless communication, various types of wireless communication devices such as business use, amateur use, and mobile phones have been used.

  DTMF (Dual-Tone Multi-Frequency) is known as one of functions used in a wireless communication device. DTMF is a method of transmitting 16 types of codes of 0 to 9, *, #, and A to D using signal sounds in two voice frequency bands of a low group and a high group. FIG. 7 is a diagram showing a code (DTMF code) defined in ITU-T recommendation Q24 or the like. As shown in FIG. 7, two audio frequency bands of low group and high group are defined in association with 16 types of DTMF codes (0 to 9, A to D, #, *).

  As applications where DTMF is used, there are general applications such as individual calling and remote control between wireless communication devices (control for remotely operating a device having a DTMF decoder: for example, control for remotely operating a garage door).

  In addition, DTMF has been used for a long time in analog wireless communication for the aforementioned applications. However, in the current market situation where the wireless communication system is shifting from the analog system to the digital system, DTMF in the digital system is required.

  Next, the configuration of data (signal) transmitted in a digital manner will be described with reference to FIG. As shown in FIG. 8, data transmitted in a digital manner is configured in units of frames. FIG. 8A is a diagram illustrating a data configuration when transmitting an audio signal. As shown in FIG. 8A, the audio signal is divided into a synchronization word part 81 indicating the head of each frame and an audio data part 82 indicating voice and packet information.

  The synchronization word unit 81 has a specific signal arrangement pattern and is arranged for each predetermined number of bits. The audio data unit 82 has audio data to be transmitted, and is arranged after the synchronization word unit 81. The reception-side wireless communication device detects the received data and detects the synchronization word unit 81 from the detected signal. Then, the audio data unit 82 is decoded in accordance with the detected synchronization timing of the synchronization word unit 81 and output to a speaker or the like.

  FIG. 8B is a diagram illustrating a data configuration when a DTMF signal is transmitted. As shown in FIG. 8B, the DTMF signal is divided into a synchronization word portion 83 and a DTMF data portion 84. In this case, the audio data part 82 shown in FIG. 8A is replaced with the DTMF data part 84 and transmitted.

  In order to detect the above-described DTMF signal in the radio communication device on the receiving side, it is necessary to determine what the received DTMF signal corresponds to in the DTMF code (the above-mentioned 16 codes). In order to make this determination efficiently, a function of a vocoder (hereinafter referred to as vocoder), which is a kind of audio compression technology, is used. FIG. 9 shows a configuration of a conventional wireless communication device 100 using a vocoder.

  As illustrated in FIG. 9, the wireless communication device 100 includes an antenna 101, a front end unit 102, a detection processing unit 103, a synchronization detection unit 104, a vocoder unit FEC decoding unit 105, and a vocoder unit code detection unit 106. The vocoder unit audio decoding unit 107, the DTMF match determination unit 108, and the speaker unit 109 are configured. In the wireless communication device 100 shown in FIG. 9, the vocoder corresponds to a vocoder unit FEC decoding unit 105, a vocoder unit code detection unit 106, and a vocoder unit audio decoding unit 107.

  The antenna 101 receives the transmitted signal. The front end unit 102 takes in the signal received from the antenna 101 and outputs it to the detection processing unit 103. The detection processing unit 103 performs detection processing on the input signal, and outputs the detected signal to the synchronization detection unit 104. The synchronization detection unit 104 establishes synchronization of the input signal and outputs it to the vocoder unit FEC decoding unit 105. The vocoder unit FEC decoding unit 105 performs decoding of the input signal and FEC (Forward Error Correction) error correction (hereinafter, error correction), and outputs the signal to the vocoder unit code detection unit 106 and the vocoder unit audio decoding unit 107. .

  The vocoder code detection unit 106 determines whether the input signal is a voice signal or a DTMF signal. Specifically, the vocoder part code detection unit 106 refers to the frame configuration of the input signal, and is input based on whether the audio data unit 82 or the DTMF data unit 84 is configured in the frame configuration. It is determined whether the signal is an audio signal or a DTMF signal. If the vocoder code detecting unit 106 determines that the input signal is a DTMF signal, the vocoder unit code detecting unit 106 determines whether the DTMF code is detected or not detected from the signal (error-corrected signal). Then, the vocoder part code detection unit 106 outputs the detected or undetected result to the DTMF match determination unit 108. For example, if the detected DTMF code is “1”, “1” is output to the DTMF match determination unit 108, and if the DTMF code is not detected, a signal indicating that it has not been detected (for example, “×”). ) Is output to the DTMF match determination unit 108.

  The vocoder unit audio decoding unit 107 determines whether the input signal is an audio signal or a DTMF signal. The determination is performed by the same determination as that of the vocoder unit code detection unit 106. When the vocoder unit audio decoding unit 107 determines that the input signal is an audio signal, the vocoder unit audio decoding unit 107 decodes the audio signal and outputs the decoded audio signal to the speaker unit 109.

  The DTMF match determination unit 108 recognizes (determines) the tone pattern of the input signal (for example, the signal of the DTMF code “1” or “x”), and recognizes the recognized tone pattern and a preset tone pattern. Whether or not matches. If the DTMF match determination unit 108 determines that they match, the DTMF match determination unit 108 outputs a match sound to the speaker unit 109. At this time, the DTMF match determination unit 108 is not limited to the operation of outputting the match sound, but operates according to a predetermined tone pattern. And the speaker part 109 outputs the input audio | voice signal or a coincidence sound.

  Next, the operation of the receiving-side radio communication device that receives the DTMF signal in the digital method will be described. At this time, the wireless communication device decodes the DTMF signal received at a predetermined time interval and detects a DTMF code at the predetermined time interval. Hereinafter, the predetermined time interval is assumed to be 20 (ms).

  FIG. 10 is a diagram illustrating an example when the receiving-side wireless communication device 100 detects a DTMF code and recognizes (determines) a tone pattern of the detected DTMF code. The transmission code indicates a tone pattern of a DTMF code to be transmitted. The transmission code is transmitted when the user presses the key button of the transmission side wireless communication device, or the tone pattern of the DTMF code stored in the transmission side wireless communication device in advance is automatically transmitted. There is. In this case, “15” is transmitted as the transmission code with On Time 100 (ms) and Off Time 60 (ms). Here, On Time indicates the time during which the DTMF code is transmitted (transmission time of the DTMF code). Off Time indicates a time during which the DTMF code is not transmitted (for example, a time when the user releases the key button). In wireless communication device 100, it is assumed that tone pattern “15” is registered in advance by the user, and the registered tone pattern “15” is stored.

  10 is an example of the DTMF code detected by the vocoder part code detection unit 106 at intervals of 20 ms. In this case, as shown in FIG. 10, “11111xxx55555” is detected by the vocoder part code detection unit 106. Each detected numerical value indicates a DTMF code detected every 20 ms. Further, x represents a code indicating that a DTMF code has not been detected.

  When the DTMF code shown in FIG. 10 is detected, the DTMF match determination unit 108 processes “1” as 100 (ms), Off Time as 60 (ms), and “5” as 100 (ms) (software processing). The tone pattern is recognized (determined) as “15”. Then, the DTMF match determination unit 108 determines that the determined tone pattern “15” matches the tone pattern “15” registered in advance. The coincidence sound is output to the speaker unit 109, and the coincidence sound is output from the speaker unit 109. The above is a series of operations when the wireless communication device 100 receives a DTMF signal in the digital method.

  There is also known a DTMF detection device that can prevent erroneous detection due to level monitoring of an input signal (see, for example, Patent Document 1).

JP 2006-135509 A

  However, in the wireless communication device 100 described above, the performance of recognizing the tone pattern of the DTMF code has been deteriorated in a weak electric field.

  Here, with reference to FIG. 11, the operation of radio communication apparatus 100 in a weak electric field (when the received DTMF signal is easily affected by noise) will be described. In this case, as in FIG. 10, it is assumed that “15” is transmitted as the transmission code with On Time 100 (ms) and Off Time 60 (ms). In addition, noise between 40 (ms) and 80 (ms) of “1” (A in FIG. 11) and between 0 (ms) and 20 (ms) of “5” (B in FIG. 11) due to weak electric field. It is assumed that the error cannot be corrected and has not been detected due to the influence of.

  In this case, “11xxx1xxx5555” is detected by the vocoder part code detection unit 106. Then, the DTMF match determination unit 108 determines that “1” is 40 (ms), Off Time is 40 (ms), “1” is 20 (ms), Off Time is 80 (ms), and “5” is 80 (ms). The tone pattern is recognized (determined) as “115”. Then, although the tone pattern of the transmission code (transmitted DTM code) is “15”, the wireless communication device 100 erroneously recognizes the tone pattern as “115”. For this reason, the performance of recognizing the tone pattern of the DTMF code is deteriorated in a weak electric field.

  An object of the present invention is to improve the performance of recognizing a DTMF code tone pattern.

In order to solve the above-described problem, a wireless communication device according to claim 1 is provided.
A decoding unit that performs error correction on the data when decoding the data at predetermined time intervals;
A detection unit that determines detection or non-detection of a DTMF code at a predetermined time interval from the error-corrected data, and outputs the determined result;
An error acquisition unit that acquires the number of errors in the data according to the result of error correction;
An undetected continuous number of times setting unit for setting an undetected continuous number of times based on the number of errors acquired from the error acquiring unit;
A determination unit that compares the number of consecutive undetected detections indicating the number of consecutive DTMF codes undetected by the detection unit with the number of consecutive undetected detections and determines a tone pattern of the DTMF code based on the comparison result When,
Is provided.

The invention according to claim 2 is the wireless communication device according to claim 1,
The determination unit
When the undetected continuous detection count is equal to or greater than the undetected set continuous count, it is determined that the DTMF code corresponding to the undetected continuous detection count is undetected, and the undetected continuous detection count is the undetected set continuous count. Is smaller than the DTMF code corresponding to the number of consecutive undetected detections, it is determined that the last detected DTMF code is continuous.

A third aspect of the present invention is the wireless communication device according to the first or second aspect,
The undetected continuous number of times setting unit is
A storage unit that stores a relationship in which a predetermined number of errors is associated with a number of consecutive undetected times for determining whether a DTMF code is detected or not detected, and the number of errors acquired from the error acquiring unit and the storage A setting unit for setting the number of consecutive undetected settings based on the number of consecutive undetected times.

The invention according to claim 4 is the wireless communication device according to any one of claims 1 to 3,
The undetected continuous number of times setting unit is
When it is known in advance that the reference value that associates the number of errors with the number of consecutive undetected times is stored in the storage unit, and the transmission time of the DTMF code is used longer than a predetermined time. If the number of errors smaller than the number of errors of the reference value is stored in the storage unit and it is known in advance that the DTMF code has the same tone pattern, the number of errors of the reference value The number of errors having a large value is stored in the storage unit.

The program of the invention described in claim 5 is:
Computer
A decoding unit that performs error correction on the data when the data is decoded at predetermined time intervals;
A detection unit that determines detection or non-detection of a DTMF code at a predetermined time interval from the error-corrected data, and outputs the determined result;
An error acquisition unit for acquiring the number of data errors according to the result of the error correction;
An undetected continuous number of times setting unit that sets an undetected continuous number of times based on the number of errors acquired from the error acquiring unit,
A determination unit that compares the number of consecutive undetected detections indicating the number of consecutive DTMF codes undetected by the detection unit with the number of consecutive undetected detections and determines a tone pattern of the DTMF code based on the comparison result ,
To function as.

  According to the present invention, the performance of recognizing the tone pattern of the DTMF code can be improved.

It is a figure which shows the internal structure of the radio | wireless communication apparatus which concerns on this invention. (A) is a figure showing the graph showing the number of FEC errors corresponding to the RF level of the received signal. (B) is a figure which shows an example of the data memorize | stored by the undetected continuous frequency setting part. It is a figure which shows an example when the tone pattern of the detected DTMF code | cord is recognized. It is a figure which shows an example when the tone pattern of the detected DTMF code | cord is recognized. It is a figure which shows an example when the tone pattern of the detected DTMF code | cord is recognized. It is a flowchart which shows the flow of a tone pattern recognition process. It is a figure showing a DTMF code. (A) is a figure which shows the data structure in the case of transmitting an audio | voice signal. (B) is a figure which shows a data structure in the case of transmitting a DTMF signal. It is a figure which shows the internal structure of the conventional radio | wireless communication apparatus. It is a figure which shows an example when the tone pattern of the detected DTMF code | cord is recognized. It is a figure which shows an example when the tone pattern of the detected DTMF code | cord is recognized.

  Embodiments according to the present invention will be described below in detail with reference to the accompanying drawings. However, the scope of the invention is not limited to the illustrated examples.

  Embodiments according to the present invention will be described with reference to FIGS. The wireless communication device 1 according to the present embodiment includes an antenna 11, a front end unit 12, a detection processing unit 13, a synchronization detection unit 14, a vocoder unit FEC decoding unit 15 as a decoding unit, and an error acquisition unit. Vocoder unit FEC error acquisition unit 15A, undetected continuous count setting unit 15B as a storage control unit, vocoder unit code detection unit 16 as a detection unit, vocoder unit audio decoding unit 17, and DTMF match determination as a determination unit A unit 18 and a speaker unit 19 are provided. In the wireless communication device 1, the vocoder corresponds to the vocoder unit FEC decoding unit 15, the vocoder unit code detection unit 16, the vocoder unit audio decoding unit 17, and the vocoder unit FEC error acquisition unit 15A.

  The antenna 11, the front end unit 12, the detection processing unit 13, the synchronization detection unit 14, the vocoder unit FEC decoding unit 15, the vocoder unit code detection unit 16, the vocoder unit audio decoding unit 17, the DTMF match determination unit 18, and the speaker unit 19 are The antenna 101, the front end unit 102, the detection processing unit 103, the synchronization detection unit 104, the vocoder unit FEC decoding unit 105, the vocoder unit code detection unit 106, the vocoder unit audio decoding unit 107, and the DTMF match in the wireless communication device 100 (FIG. 9) The determination unit 108 and the speaker unit 109 have the same configuration. Hereinafter, different parts will be mainly described.

The vocoder part FEC decoding part 15 calculates | requires the error number (FEC error number) which shows the grade (BER: Bit Error Rate) of an error by the result of error correction.
The DTMF match determination unit 18 compares the undetected continuous detection count with the undetected continuous set count, and determines (recognizes) a DTMF code tone pattern based on the comparison result.
The number of undetected continuous detections indicates the number of consecutive DTMF codes that have not been detected by the vocoder unit code detection unit 16. The undetected continuous setting number indicates the number set by the undetected continuous number setting unit 15B.

  The vocoder unit FEC error acquisition unit 15A reads and acquires the number of FEC errors from the vocoder unit FEC decoding unit 15, and outputs the acquired number of FEC errors to the undetected continuous number of times setting unit 15B.

The undetected continuous count setting unit 15B includes a storage unit that stores a relationship in which a predetermined number of errors (threshold value) and the undetected continuous count are associated with each other, and a setting unit that sets the undetected continuous set number of times. .
The storage unit is configured by a RAM (Random Access Memory) or the like. The threshold indicates the number of FEC errors corresponding to the number of consecutive undetected times. The undetected consecutive number indicates a value for determining whether a DTMF code is detected or not detected. The storage unit stores, for example, the number of FEC errors shown in FIG.
The setting unit sets the number of consecutive undetected settings based on the number of FEC errors detected by the vocoder unit code detection unit 16 and the number of consecutive undetected times stored in the storage unit.
Specifically, when the number of FEC errors detected by the vocoder part code detection unit 16 is “1500”, the setting unit sets the number of FEC errors “1500” that matches the detected number of FEC errors “1500”. The number of consecutive undetected times stored in correspondence with the referenced number of FEC errors “1500” is set as the number of consecutive undetected settings.

  Here, a correspondence relationship between the number of FEC errors and the number of undetected consecutive times will be described with reference to FIG. FIG. 2A is a graph showing the number of FEC errors corresponding to the RF (Radio Frequency) level of the received signal. The horizontal axis of the graph shown in FIG. 2A indicates the RF level, and the vertical axis indicates the number of FEC errors. Line 21 shows the transition of the number of FEC errors according to the RF level. As shown by the line 21, the number of FRC errors increases as the electric field becomes weaker (the RF level becomes smaller). Lines 22, 23, 24, and 25 indicate threshold values corresponding to the undetected consecutive times, respectively.

  FIG. 2B shows an example of data stored by the undetected continuous number of times setting unit 15B. For example, the threshold value (the number of FEC errors) corresponding to the undetected consecutive number of times “5” is “3500”. In this case, the threshold “3500” is represented by the line 22 in FIG.

  Further, the association between the threshold and the undetected continuous number by the undetected continuous number setting unit 15B is performed based on information input by the user (corresponding information for associating the threshold and the undetected continuous number). For example, when the user inputs information that sets the threshold value for the undetected consecutive number of times “5” to “3500”, based on the input information, the undetected consecutive number of times “5 times” and the threshold value “3500” Are associated with each other, and the associated undetected consecutive number of times “5 times” and the threshold value “3500” are stored in the storage unit.

  The user inputs information when registering the tone pattern. At this time, the user inputs information that makes the threshold shallower or deeper than the reference value. The reference value is a reference value for the number of consecutive undetected times and the threshold value. For example, when the undetected consecutive number of times “4 times” and the threshold value “1500” are reference values, an input for making the threshold value shallow with respect to the reference value (for example, the threshold value of the undetected consecutive number of times “4 times” is set to “1000”). Or an input for deepening the threshold with respect to the reference value (for example, an input for setting the threshold of “4 times of undetected consecutive times” to “2000”).

  Information input by the user is input according to the use of the wireless communication device 1. Specifically, the wireless communication device 1 is used for receiving a DTMF code whose On Time (DTMF code transmission time) is longer than a predetermined time, or for receiving a tone pattern followed by the same DTMF code. It is input according to whether it is.

  When the wireless communication device 1 receives a DTMF code whose On Time is longer than a predetermined time, the tone pattern of the DTMF code can be accurately recognized by decreasing the threshold (increasing the number of consecutive undetected times as the electric field becomes weaker). Probability increases. For example, when the wireless communication device 1 detects a DTMF code every 20 (ms), the DTMF code may be undetected at a rate of once every five times (100 ms). At this time, if On Time is shorter than a predetermined time (for example, 500 (ms)) (for example, 100 (ms)), the probability that undetection continues three times and four times is small. However, when On Time is longer than a predetermined time (for example, 1000 (ms)), the probability of being continuously undetected greatly increases. Therefore, when a DTMF code having a long On Time is received, the probability of correctly recognizing the tone pattern of the DTMF code increases as the threshold value is decreased.

  Further, when the wireless communication device 1 receives a tone pattern followed by the same DTMF code, the probability of correctly recognizing the tone pattern of the DTMF code increases as the threshold value is increased. Here, the operation of the wireless communication device 1 when a tone pattern followed by the same DTMF code is received will be described. FIG. 3 is a diagram illustrating an example when the wireless communication device 1 receives a tone pattern followed by the same DTMF code, detects the DTMF code, and recognizes (determines) the tone pattern of the detected DTMF code. At this time, “11” is transmitted as On Code 100 (ms) and Off Time 60 (ms) as a transmission code. In addition, it is assumed that the number of consecutive undetected settings corresponding to the acquired number of FEC errors is set to “4 times”.

  In this case, the vocoder part code detection unit 16 detects “11111xxx11111”. Further, since the number of consecutive undetected settings is set to “4”, the DTMF code is not determined to be undetected unless undetected four times. For this reason, the DTMF match determination unit 18 does not determine that the DTMF code undetected portion (undetected continuous portion 31) is undetected. Then, the DTMF match determination unit 18 erroneously recognizes (determines) the tone pattern of the DTMF code as “1” (that is, when the last detected DTMF code “1” is continuous).

  In this case, if the threshold value of the number of consecutive undetected times is deepened, the undetected continuous portion 31 is determined to be undetected. For example, it is assumed that the acquired number of FEC errors is “1600”, the threshold value of the undetected consecutive number of times “4” is “1500”, and the threshold value of the undetected consecutive number of times “3” is “200”. In this case, if the threshold value of the undetected consecutive number of times is deep (for example, the threshold value of the undetected consecutive number of times “4” is “2000” and the threshold value of the undetected consecutive number of times “3” is “1500”) The number of consecutive undetected times corresponding to the number of FEC errors “1600” is “3 times”. In this case, the undetected continuous portion 31 has the same number as the undetected continuous number of times “3”, and thus is determined to be undetected. Then, the tone pattern of the DTMF code is accurately recognized as “11”. That is, when receiving a tone pattern in which the DTMF code of the same code continues, the probability of correctly recognizing the tone pattern of the DTMF code increases as the threshold value is decreased.

  As described above, in the case of receiving an DTMF code whose On Time (DTMF code transmission time) is longer than a predetermined time, it is desirable to decrease the threshold, and an application of receiving a tone pattern followed by the same DTMF code. In this case, since it is desirable to increase the threshold value, the optimal threshold value is contradictory. In general, the wireless communication device 1 can be used in both cases. Therefore, a value for matching both (a value at which the probability of accurately recognizing the tone pattern of the DTMF code is intermediate between both) is input in advance by the user as the reference value, and the input reference value is the number of consecutive undetected times. Stored by the setting unit 15B. For example, the threshold value (number of FEC errors) and the number of consecutive undetected times shown in FIG. 2B are stored as reference values as values for achieving both of the above-described matching.

  Then, the user inputs correspondence information with respect to a reference value stored in advance (an input for making the threshold value deeper or shallower than the threshold value of the reference value) according to the use of the wireless communication device 1. For example, when it is an application that does not receive a long DTMF code of On Time (that is, when it is known in advance that it is an application that receives a tone pattern followed by the same DTMF code; for example, automatically transmits a DTMF code) ), An input for deepening the threshold with respect to the threshold of the reference value is performed. For example, when the undetected consecutive number of times “4 times” and the threshold value “1500” are the reference values, the user inputs the threshold value corresponding to the undetected consecutive number of times deeper than the threshold value of the reference value (for example, the undetected consecutive number of times “4”). The threshold value corresponding to “times” is input to a value “2000” larger than the threshold value “1500” of the reference value). Then, the value “2000” larger than the threshold value of the reference value is stored as a threshold value by the undetected continuous frequency setting unit 15B (the undetected continuous frequency “4 times” and the threshold value “2000” are associated with each other). Remembered).

  In the case of an application that does not receive a tone pattern that is followed by the same DTMF code (that is, when it is known in advance that the wireless communication device 1 is used to receive a DTMF code whose On Time is longer than a predetermined time). Then, an input for making the threshold shallower than the threshold of the reference value is performed. For example, when a user registers a telephone number as a tone pattern, if the telephone number to be registered is not a telephone number followed by the same DTMF code, the user performs an input to make the threshold value shallower than the reference value. Specifically, when the number of consecutive undetected times “4” and the threshold value “1500” are reference values, an input for making the threshold corresponding to the number of undetected consecutive times shallower than the threshold value of the reference value (for example, the number of consecutive undetected times “ The threshold value corresponding to “4 times” is input to make the value “1000” smaller than the threshold value “1500” of the reference value). Then, the value “1000” that is smaller than the threshold value of the reference value is stored as the threshold value by the undetected continuous frequency setting unit 15B (the storage unit is associated with the undetected continuous frequency “4 times” and the threshold value “1000”). Remembered).

  Next, the operation of the wireless communication device 1 will be described with reference to FIGS. 4 and 5. FIG. 4 is a diagram illustrating an example when the wireless communication device 1 detects the same DTMF code as that in FIG. 11. The transmission code and the DTMF code detected by the vocoder part code detector 16 are the same as those in FIG. Further, in this case, since the same code does not continue as the transmission code, the threshold value is inputted shallowly by the user with respect to the threshold value of the reference value, and the undetected continuous setting number corresponding to the acquired number of FEC errors is “3 times”. ”Is set.

  In this case, since the number of consecutive undetected settings is set to “3”, the DTMF match determination unit 18 does not detect that DTMF code has not been detected three times even if it has not been detected twice consecutively. Not determined to be detected. Therefore, even if “11xxx1xxx5555” is detected by the vocoder part code detection unit 16, the tone pattern is recognized (determined) by the DTMF match determination unit 18. That is, the tone pattern can be accurately recognized.

  FIG. 5 is a diagram illustrating an example when the wireless communication device 1 detects a DTMF code similar to that in FIG. 3. The transmission code and the DTMF code detected by the vocoder part code detector 16 are the same as those in FIG. In this case, since the transmission code is the same code, the threshold value is deeply input by the user with respect to the threshold value of the reference value (the threshold value is input deeply compared to FIG. 3), and corresponds to the number of FEC errors acquired. It is assumed that the undetected continuous setting number is set to “3 times”.

  In this case, since the number of consecutive undetected settings is set to “3”, the DTMF match determination unit 18 determines that the DTMF code has not been detected for three consecutive times. Therefore, after “11111xxx11111” is detected by the vocoder part code detection unit 16, the tone pattern is recognized (determined) as “11” by the DTMF match determination unit 18. That is, the tone pattern can be accurately recognized.

  Next, a tone pattern recognition process executed by the wireless communication device 1 will be described with reference to FIG. The tone pattern recognition process is a process for recognizing a tone pattern based on the number of consecutive undetected times.

  It is assumed that the user has previously entered the tone pattern registration and information (information for associating the threshold value with the undetected continuous count) to the wireless communication device 1 by the user. Further, it is assumed that the threshold value and the undetected continuous number of times are associated with each other and stored in the storage unit by the undetected continuous number of times setting unit 15B based on information input by the user. In addition, it is assumed that the wireless communication device 1 receives a DTMF signal and a detection process and a synchronization detection process are performed on the received DTMF signal.

  First, the vocoder unit FEC decoding unit 15 decodes the DTMF signal and executes FEC correction (step S1). Then, the vocoder part code detection unit 16 determines the signal. In this case, the vocoder part code detector 16 determines that the signal is a DTMF signal. Then, the vocoder part code detector 16 determines whether the DTMF code is detected or not detected, and outputs a determination result (step S2).

  After execution of step S2, the vocoder unit FEC error acquisition unit 15A reads the number of FEC errors from the vocoder unit FEC decoding unit 15, and acquires the read number of FEC errors (step S3). Then, an FEC error that matches the acquired number of FEC errors is referred to from the storage unit, and the undetected continuous count stored in association with the referenced FEC error count is set as the undetected continuous set count. The undetected continuous set number of times is read (step S4).

  After execution of step S4, the DTMF code determination unit 18 compares the undetected continuous detection count determined as undetected in step S2 with the undetected continuous set count read in step S3, and the tone pattern of the DTMF code Is recognized (step S5). For example, in the case of the condition shown in FIG. 5, as shown in the undetected continuous portion 51, the number of undetected continuous detections detected in step S <b> 2 is “3 times”. In addition, the undetected continuous setting number read in step S3 is “three times”. In this case, since the number of undetected continuous detections of the DTMF code detected in step S2 is the same as the number of undetected continuous settings read in step S3, the undetected continuous part 51 is determined to be undetected, and DTMF The tone pattern of the chord is recognized (determined) as “11”. Then, it is determined that the recognized “11” matches the tone pattern (“11” in this case) of the DTMF code registered in advance, and a matching sound is output to the speaker unit 19. Then, a coincidence sound is output from the speaker unit 19. After execution of step S5, the tone pattern recognition process is terminated.

As described above, according to the present embodiment, the comparison between the number of undetected continuous detections of the DTMF code undetected by the vocoder unit code detection unit 16 and the number of consecutive non-detection settings set by the undetected continuous number of times setting unit 15B Based on the result, the tone pattern of the DTMF code is determined (recognized). For this reason, it is possible to prevent the tone pattern from being erroneously recognized, and to improve the performance of recognizing the tone pattern of the DTMF code.
Further, since the number of consecutive undetected times is stored in association with the degree of error (FRC error number), the performance of recognizing the tone pattern of the DTMF code can be improved in both cases of weak electric field and strong electric field.

  In addition, when the number of undetected continuous detections of the DTMF code undetected by the vocoder unit code detection unit 16 is equal to or greater than the number of consecutive undetected DTMF codes set by the undetected continuous number setting unit 15B, the vocoder unit code detection is performed. The DTMF code (for example, the undetected continuous portion 51 in FIG. 5) corresponding to the number of undetected continuous detections of the DTMF code undetected by the unit 16 is determined as undetected. On the other hand, when the number of undetected continuous detections of the DTMF code undetected by the vocoder unit code detection unit 16 is smaller than the number of undetected continuous setting times of the DTMF code set by the undetected continuous number setting unit 15B, the vocoder unit code The DTMF code corresponding to the number of consecutive undetected DTMF codes that have not been detected by the detection unit 16 is determined to be continuous with the last detected DTMF code. For this reason, the detection of the DTMF code can be determined according to the set number of consecutive undetected settings.

  Further, based on information (corresponding information) input by the user, the number of errors (FEC error count threshold) and the number of consecutive undetected DTMF codes are associated and stored in the storage unit. For this reason, based on correspondence information desired by the user, the threshold value and the number of consecutive undetected times can be associated with each other and stored in the storage unit.

  Further, when it is known in advance that the transmission time of the DTMF code is longer than the predetermined time (when the wireless communication device 1 receives a DTMF code whose OnTime is longer than the predetermined time), A threshold value smaller than the reference value threshold value (the number of FEC errors) is stored in the storage unit. When it is known in advance that the DTMF code is the same tone pattern (when the wireless communication apparatus 1 receives a tone pattern followed by the same DTMF code), the threshold value is larger than the threshold value of the reference value. Is stored in the storage unit. For this reason, since the threshold value corresponding to the undetected continuous number of times can be changed according to the application of the wireless communication device 1, the performance of recognizing the tone pattern of the DTMF code can be further improved.

  The description in each of the above embodiments is an example of a wireless communication device and a program according to the present invention, and the present invention is not limited to this.

  For example, in the above embodiment, the number of FEC errors and the number of consecutive undetected times are stored in association with each other. However, the present invention is not limited to this. For example, the value obtained by the RSSI function (the function of digitizing the level of the received signal) or the error rate of the synchronization word may be stored in association with the number of consecutive undetected times.

  In addition, the detailed structure and detailed operation of the wireless communication device 1 in the present embodiment can be changed as appropriate without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 1 Wireless communication device 11 Antenna 12 Front end part 13 Detection processing part 14 Synchronization detection part 15 Vocoder part decoding part 15A Vocoder part error acquisition part 15B Undetected continuous frequency setting part 16 Vocoder part code detection part 17 Vocoder part voice decoding part 18 DTMF Match determination unit 19 Speaker unit

Claims (5)

A decoding unit that performs error correction on the data when decoding the data at predetermined time intervals;
A detection unit that determines detection or non-detection of a DTMF code at a predetermined time interval from the error-corrected data, and outputs the determined result;
An error acquisition unit that acquires the number of errors in the data according to the result of error correction;
An undetected continuous number of times setting unit for setting an undetected continuous number of times based on the number of errors acquired from the error acquiring unit;
A determination unit that compares the number of consecutive undetected detections indicating the number of consecutive DTMF codes undetected by the detection unit with the number of consecutive undetected detections and determines a tone pattern of the DTMF code based on the comparison result When,
A wireless communication device. The determination unit
When the undetected continuous detection count is equal to or greater than the undetected set continuous count, it is determined that the DTMF code corresponding to the undetected continuous detection count is undetected, and the undetected continuous detection count is the undetected set continuous count. 2. The wireless communication device according to claim 1, wherein the DTMF code corresponding to the undetected continuous detection count is determined to be continuous with the last detected DTMF code. The undetected continuous number of times setting unit is
A storage unit that stores a relationship in which a predetermined number of errors is associated with a number of consecutive undetected times for determining whether a DTMF code is detected or not detected, and the number of errors acquired from the error acquiring unit and the storage The wireless communication device according to claim 1, further comprising a setting unit configured to set a number of consecutive undetected settings based on the number of consecutive undetected units. The undetected continuous number of times setting unit is
When it is known in advance that the reference value that associates the number of errors with the number of consecutive undetected times is stored in the storage unit, and the transmission time of the DTMF code is used longer than a predetermined time. If the number of errors smaller than the number of errors of the reference value is stored in the storage unit and it is known in advance that the DTMF code has the same tone pattern, the number of errors of the reference value The wireless communication device according to claim 1, wherein an error number having a large value is stored in the storage unit. Computer
A decoding unit that performs error correction on the data when the data is decoded at predetermined time intervals;
A detection unit that determines detection or non-detection of a DTMF code at a predetermined time interval from the error-corrected data, and outputs the determined result;
An error acquisition unit for acquiring the number of data errors according to the result of the error correction;
An undetected continuous number of times setting unit that sets an undetected continuous number of times based on the number of errors acquired from the error acquiring unit,
A determination unit that compares the number of consecutive undetected detections indicating the number of consecutive DTMF codes undetected by the detection unit with the number of consecutive undetected detections and determines a tone pattern of the DTMF code based on the comparison result ,
Program to function as.

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