JP2010147685A - Music sound decision device, music sound decision method, fm radio receiver, and program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem that the conventional FM radio receiver can not decide whether the content of other broadcasting station is music or sound while listening to broadcast of a specific broadcasting station. <P>SOLUTION: This FM radio receiver is provided with: an antenna 10 which receives FM modulation radio waves; an FE part 20 which outputs an IF signal from a received FM modulation signal; a quadrature detection part 30 which outputs a quadrature detection signal IQ signal from the IF signal; an FM demodulation part 40 which performs FM demodulation of the IQ signal; a stereo demodulation part 50 which performs stereo demodulation of the FM demodulation signal and output the resultant signal; a speaker part 60 which reproduces a stereo signal; a second FE part which inputs the FM-modulated signal received by the antenna 10, and converts the signal into an intermediate frequency band to output a second IF signal; a second quadrature detection part which performs quadrature detection of the second IF signal to output a second IQ signal; and a music sound decision device 70 which decides whether the content of other broadcasting station is a music signal or sound signal by utilizing the second IQ signal. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a music sound determination device, an FM radio receiver, and the like that can respond to various requests of users by determining broadcast contents.

  A conventional music voice determination device determines whether an input signal is a music signal or a voice signal based on the input 2ch L and R signals (see, for example, Patent Document 1).

  FIG. 19 shows an FM radio receiver using the above-described conventional music voice judging device.

  In FIG. 19, an antenna unit 10 is an antenna that receives radio waves transmitted from a broadcasting station. The FE unit 20 converts the radio wave received by the antenna unit 10 into an intermediate frequency band and outputs an IF signal. The quadrature detection unit 30 performs quadrature detection on the IF signal output from the FE unit 20 and outputs an IQ signal. The FM demodulator 40 FM-demodulates the IQ signal output from the quadrature detector 30 and outputs an FM demodulated signal.

  The stereo demodulator 50 stereo-demodulates the FM demodulated signal output from the FM demodulator 40 and outputs a stereo signal. The speaker unit 60 reproduces the stereo signal output from the stereo demodulating unit 50 and provides broadcast contents to the user.

In this configuration, the music sound determination device 90 determines whether the broadcast content is music or sound using the stereo signals (L signal, R signal) output from the stereo demodulator 50. That is, based on the addition signal of the amplitudes of the L signal and the R signal and the subtraction signal of the amplitude, it is determined whether the input L and R signals are music or voice.
Japanese Patent No. 2961952

  However, with such a conventional configuration, it is impossible to determine whether the broadcast content of other stations is music or voice while listening to the broadcast that the user is currently receiving.

  Therefore, the present invention considers the problems of the conventional configuration as described above, and simultaneously determines whether the broadcast content of other stations is music or sound while listening to the broadcast that the user is currently receiving. It is an object of the present invention to provide an FM radio receiver and a music sound determination device applicable to such an FM radio receiver.

The first aspect of the present invention is
An input unit for inputting an FM modulated signal;
And a determination processing unit that determines whether the content of the FM-modulated signal input from the input unit is a music signal or a sound signal.

The second aspect of the present invention
The FM-modulated signal input to the input unit is an IQ signal subjected to quadrature detection.

The third aspect of the present invention provides
The FM-modulated signal input to the input unit is an IF signal converted into an intermediate frequency band.

The fourth invention relates to
In addition, it comprises one or more frequency filters,
The determination processing unit performs content determination of the signal using at least a filter signal obtained by passing the input signal input from the input unit through the frequency filter. It is the music audio | voice determination apparatus of any of this invention.

The fifth aspect of the present invention relates to
The determination processing unit performs the content determination of the signal by using the input signal and the filter signal input from the input unit, and is the music voice determination device according to the fourth aspect of the present invention.

The sixth invention relates to
The frequency filter is a plurality of filters having different frequencies to be processed,
The music voice determination apparatus according to the fourth aspect of the present invention is characterized in that the content of the signal is determined using a plurality of filter signals processed by the different frequency filters.

The seventh invention relates to
The frequency filter is a band filter or a low-pass filter.

The eighth invention relates to
The determination process performed by the determination processing unit is a final determination process of a music signal or an audio signal, or a preliminary process for performing the determination. is there.

The ninth invention relates to
An antenna for receiving FM-modulated radio waves transmitted from a broadcasting station;
A first FE unit that converts the received FM modulated signal into an intermediate frequency band and outputs a first IF signal;
A first quadrature detector for quadrature detecting the first IF signal and outputting a first IQ signal;
An FM demodulator for FM demodulating the first IQ signal and outputting an FM demodulated signal;
Stereo demodulating the FM demodulated signal and outputting a stereo signal;
A speaker unit for reproducing the stereo signal and providing broadcast content;
A music voice determination device of the first aspect of the present invention for processing an FM-modulated signal received by the antenna;
It is FM radio receiver provided with.

The tenth aspect of the present invention is
A second FE unit that receives an FM-modulated signal received by the antenna, converts the signal to an intermediate frequency band, and outputs a second IF signal;
The music sound determination apparatus is an FM radio receiver according to a ninth aspect of the present invention, which receives and processes the second IF signal.

The eleventh aspect of the present invention is
A second FE unit that receives an FM modulated signal received by the antenna, converts the signal to an intermediate frequency band, and outputs a second IF signal;
A second quadrature detection unit that quadrature-detects the second IF signal and outputs a second IQ signal;
The music voice determination device is an FM radio receiver according to a ninth aspect of the present invention, which receives and processes the second IQ signal.

The twelfth aspect of the present invention is
The frequency received by the first FE unit is different from the frequency received by the second FE unit,
The FM radio receiver according to the tenth or eleventh aspect of the present invention, wherein the music voice determination device makes the determination on the content of an output signal having a frequency different from the frequency of the signal output from the speaker. .

The thirteenth aspect of the present invention is
The music voice judging device judges the contents by using the output of a frequency filter added for other functions such as a countermeasure for adjacent interference and the like. Machine.

The fourteenth aspect of the present invention is
Determination operation instruction means for instructing driving of the music sound determination device;
A display unit for displaying a result determined by the music sound determination device,
In accordance with an instruction from the determination operation instruction means, the second FE unit of the music voice determination device receives a reception frequency so as to receive another frequency different from the frequency received by the first FM unit. The tenth or eleventh feature is characterized in that, after the frequency is switched and the determination of the broadcast content of the reception frequency is completed, the broadcast content of each broadcast station is sequentially determined by switching to another reception frequency. It is FM radio receiver of this invention.

The fifteenth aspect of the present invention is
An input step for inputting an FM modulated signal;
And a determination processing step for determining whether the content of the input FM-modulated signal is a music signal or a sound signal.

According to a sixteenth aspect of the present invention, there is provided an input step of inputting an FM-modulated signal according to the fifteenth music sound determination method;
And a determination processing step for determining whether the content of the input FM-modulated signal is a music signal or a sound signal.

  According to the FM radio receiver of the present invention, it is possible to determine whether the broadcast content of another station is music or voice while listening to the broadcast that the user is currently receiving.

  Furthermore, the FM radio receiver of the present invention has a high manufacturing cost in which another FM demodulator is provided in addition to the original FM demodulator provided for listening to the radio, and the other FM demodulator is used. Therefore, the manufacturing cost is low.

  In addition, since the music sound determination apparatus and music sound determination method of the present invention can determine the broadcast content without using the output of the FM demodulated signal of the FM demodulation unit, the broadcast content can be determined without providing the FM demodulation unit. The manufacturing cost is low.

  The best mode for carrying out the present invention will be described below with reference to the drawings. In each drawing, components not related to the present invention are omitted.

(Embodiment 1)
FIG. 1 is a functional block diagram of an FM radio receiver according to Embodiment 1 of the present invention. In FIG. 1, the same reference numerals are used for the same components (antenna unit 10, first FE unit 20, first quadrature detection unit 30, FM demodulation unit 40, stereo demodulation unit 50, speaker unit 60) as in FIG. The description is omitted.

  In FIG. 1, a second FE unit 21 is a device that converts a radio wave received by the antenna unit 10 into an intermediate frequency band and outputs a second IF signal.

  The second quadrature detection unit 31 is a device that quadrature-detects the second IF signal output from the second FE unit 21 and outputs a second IQ signal.

  The music voice determination device 70 is a device that determines whether the broadcast content is music or voice based on the second IQ signal output from the second quadrature detection unit 31.

  A specific operation of the music voice determination device 70 will be described with reference to FIG. The IQ signal output from the quadrature detection unit 31 includes an I signal (In-phase-signal) and a Q signal (Quadrature-phase-signal), and is input to the input unit 100 as an input signal. In the first embodiment, the flow of processing will be described with an input signal as an I signal and a Q signal as one set.

  FIG. 2 is a functional block diagram of the music voice judging device 70. As shown in FIG.

  The zeroth signal level calculation unit 120 is a device that uses the I signal (Isig) and the Q signal (Qsig) as input signals, calculates the amplitude level Lev0 as shown in Equation 1, and outputs it.

  The first BPF 111 is a bandpass filter having a passband of 23 kHz to 53 kHz. The I signal (Isig) and the Q signal (Qsig) are input signals, and band pass filter processing is performed on the I signal and the Q signal, respectively. A signal (Ibpf1sig) and a Qbpf1 signal (Qbpf1sig) are output. The Ibpf1 signal (Ibpf1sig) and the Qbpf1 signal (Qbpf1sig) are examples of the filter signal of the present invention. Here, the pass band of the first BPF 111 is not limited to 23 kHz to 53 kHz, and it is sufficient to select a band that does not include or includes almost any audio signal, and conversely contains a lot of music signals. .

  The first signal level calculation unit 121 receives the Ibpf1 signal (Ibpf1sig) and the Qbpf1 signal (Qbpf1sig) output from the first BPF 111, calculates the amplitude level Lev1 as shown in Equation 2, and outputs it. It is.

  The determination processing unit 130 receives the amplitude level Lev0 output from the 0th signal level calculation unit 120 and the amplitude level Lev1 output from the first signal level calculation unit 121, performs determination processing, and outputs the result. Device.

  A specific operation of the determination processing unit 130 will be described with reference to FIGS. 3 and 4. The determination processing unit 130 receives the amplitude levels Lev0 and Lev1 and outputs a determination result according to the process shown in FIG.

  The content determination index calculation unit 131 in FIG. 3 calculates the content determination index MSdet as shown in Equation 3.

  Next, the determination result calculation unit 132 in FIG. 3 calculates the determination result according to the flowchart of FIG.

  In FIG. 4, a determination step 1131 determines whether or not Lev0 is smaller than a preset threshold value (Lev0thd) (for example, 10 dBμV). If it is smaller, it is determined that “the received radio wave is too small to determine the broadcast content” and it is not determined whether it is music or voice.

  If Lev0 is greater than the threshold value (Lev0thd), it is next determined in decision step 1132 whether the content determination index MSdet is greater than a preset threshold value (MSthd) (for example, 0.2). If it is larger, it is determined that “the modulation content of the input signal is music”. Otherwise, it is determined that “the modulation content of the input signal is sound”.

  In the present embodiment, it is determined whether or not the received radio wave is small in the determination step 1131. However, it is possible to determine whether the frequency is music or voice for all frequencies without performing this determination.

  Next, how to use the music voice determination device 70 will be described. For example, when the user is watching a broadcast of a desired frequency and wants to know the contents of another broadcast station, it is used as follows.

  As shown in FIG. 5, the FM radio reception 1 is equipped with a determination operation start button 2 as an input device and a display unit 3 as an output device. When the user wants to know other broadcast contents, the determination operation button 2 is operated. When the determination operation button 2 is pressed, the FM radio receiver 1 performs processing according to the flow shown in FIG. The determination operation start button 2 is an example of a determination operation instruction unit according to the present invention.

  First, in step 1500, the reception frequency of the second FE unit 21 of the FM radio receiver 1 shown in FIG. 1 is switched to another frequency. Note that the reception frequency of the first FE unit 20 is set to the frequency that the user is currently viewing.

  Next, in step 1501, the broadcast content is determined by the processing of the music sound determination device 70 using the IQ signal from the first quadrature detector 31 at the switched frequency.

  In step 1502, the display unit 3 displays the determination result and updates it.

  Next, in step 1503, it is determined whether or not the determination process can be continued. If it is determined to continue, the reception frequency of the second FE unit 21 is further switched and the process is repeated.

  Thereafter, when continuing the determination process, the reception frequency of the second FE unit 21 is sequentially switched, and each broadcast frequency is sequentially determined.

  The determination of whether or not to continue is continued when the determination operation button 3 is pressed once, when it is pressed again (double click), or when all the receivable frequencies have been determined, step 1503 In step (b), it is determined not to continue, and the process is terminated.

  A specific example of the display unit 3 will be described with reference to FIG. The display unit 3 presents to the user whether the broadcast content of frequencies other than the frequency being viewed is music or voice. FIG. 7 is an example of display.

  A box 3001 displays the frequency that the user is currently viewing. In the case of the example in the figure, the frequency that the user is viewing is 81.1 MHz.

  Box 3002 displays the broadcast content of the frequency of another broadcast station. However, what is determined by the music voice determination device 70 that “the received radio wave is too small to determine the broadcast content” is not displayed.

  The broadcast content “music or voice” is displayed together with the frequency information. In the case of the example in the figure, the frequencies for which the broadcast contents can be determined are 82.2 MHz, 83.3 MHz, 85.5 MHz, 86.6 MHz, and 88.8 MHz, and the broadcast contents are, in order, voice, music, music, voice, and music.

  By doing so, it is possible to determine the broadcast contents of other broadcast stations, for example, while listening to the currently received broadcast without newly adding an FM demodulator for determination.

(Embodiment 2)
The second embodiment differs from the first embodiment in the display unit 3 and the determination result calculation unit 132 of the determination processing unit 130 of the music voice determination device 70. Other configurations are the same as those in the first embodiment.

  First, the content determination index MSdet calculated by the content determination index calculation unit 131 will be examined in more detail. Here, when the modulation content of the input signal is music and the waveform when it is speech, the waveforms are as shown in FIGS. 8A and 8B, respectively, and the time when the MSdet of the music signal is larger than the threshold value is as follows. Long, the MSdet of the audio signal is longer than the threshold.

  Therefore, in the second embodiment, not only the mere size of the content determination index MSdet as in the first embodiment but also its duration is taken into consideration. That is, the determination result calculation unit 132 has a predetermined period (for example, 0.03 seconds, 0.3 seconds, 3 seconds, etc.) every predetermined time (for example, 0.1 seconds, 1 second, or 10 seconds). If MSdet measures the time that is greater than the preset threshold (MSthd), calculates the percentage of time that MSdet is greater than the threshold (MSthd), and if that percentage is greater than the preset threshold (eg, 25%) , “Judgment result = music” is output, and if it is below the threshold, “judgment result = sound” is output.

  Next, a description will be given with reference to FIG.

  In FIG. 9, a determination step 1131 determines whether or not Lev0 is smaller than a preset threshold value (Lev0thd) (for example, 10 dBμV). If it is smaller, it is determined that “the received radio wave is too small to determine the broadcast content” and it is not determined whether it is music or voice.

  Next, in the determination step 1133, as described above, the ratio of the time when MSdet is larger than the threshold (MSthd) is calculated. If the ratio is larger than a preset threshold (for example, 25%), “determination result = music” is set. If it is less than the threshold, “judgment result = sound” is output.

  Although it is determined in the determination step 1131 whether or not the received radio wave is small, it is possible to determine whether the frequency is music or voice for all frequencies without performing this determination.

  The judgment result calculation unit 132 outputs “judgment result = music”, “judgment result = sound”, or “cannot judge”, but outputs the ratio of the time when MSdet is larger than the threshold (MSthd) as it is or after processing May be. Note that the determination result process of music or voice corresponds to the “final determination process performed by the determination processing unit” in the present invention. This corresponds to “stops in advance processing for determination to be performed by the processing unit”.

  FIG. 10 shows a form of the display unit 3 when such a ratio is directly output.

  A box 3001 displays the frequency that the user is currently viewing. In the case of the example in the figure, the frequency that the user is viewing is 81.1 MHz.

  A box 3003 displays modulation contents of other frequencies. A broadcast content determination result is displayed together with the frequency information. However, what is determined by the music voice determination device 70 that “the received radio wave is too small to determine the broadcast content” is not displayed.

  As shown in the figure, the determination result of the broadcast content is displayed as a ratio, and music (or voice) is displayed. In this example, a value of “ratio of time when MSdet is larger than threshold (MSthd)” (%) × 2 is output from the music voice determination device 70. However, the upper limit value is 100. That is, if “the ratio of time when MSdet is greater than the threshold (MSthd)” = 25%, “50” is output, and if “the ratio of time when MSdet is greater than the threshold (MSthd)” is 50% or more, “ 100 "is output. Note that doubling the percentage (%) is usually about 25% to 50% in the case of music, so it is easy to understand for the user as a whole. This is because it is easy to see.

  In FIG. 10, the frequencies for which the broadcast content can be determined are 82.2 MHz, 83.3 MHz, 85.5 MHz, 86.6 MHz, and 88.8 MHz, and the music likeness of the broadcast content is sequentially indicated by hatched hatching 80, 30, 40, 60, 10 and is represented by a bar that can display 0 to 100 in the figure.

  In the case of this example, if it is 50 or more, it can be seen that the broadcast content has a high possibility of music, and the larger the size, the higher the possibility of music. On the other hand, if it is smaller than 50, the broadcast content is likely to be audio, and the smaller the value is, the higher the possibility of audio is.

(Embodiment 3)
The third embodiment is characterized in that the filter of the music voice determination device 70 is different from the first embodiment. The music voice determination device 70 will be described.

  FIG. 11 is a functional block diagram of the music voice determination device 70 of the third embodiment.

  The zeroth signal level calculation unit 120 receives the I signal (Isig) and the Q signal (Qsig) as input signals, calculates the amplitude level Lev0 as shown in Equation 1, and outputs it.

  The second BPF 112 is a low-pass filter having a passband of 0 kHz to 15 kHz. The Ibpf2 signal (Ibpf2sig) is obtained by using the I signal (Isig) and the Q signal (Qsig) as input signals and performing low-pass filter processing on the I signal and Q signal. ) And Qbpf2 signal (Qbpf2sig) is output. Here, the pass band of the second BPF is not limited to 0 kHz to 15 kHz. These Ibpf2 signal (Ibpf2sig) and Qbpf2 signal (Qbpf2sig) are examples of the filter signal of the present invention. The pass band is mainly a band through which an audio signal passes, and a band with a small music signal is selected.

  The second signal level calculation unit 122 receives the Ibpf2 signal (Ibpf2sig) and the Qbpf2 signal (Qbpf1sig) output from the second BPF 112, calculates the amplitude level Lev2 as shown in Equation 4, and outputs it It is.

  The determination processing unit 140 is a device that receives the amplitude level Lev0 and the amplitude level Lev2 and outputs a determination result.

  A specific operation of the determination processing unit 140 will be described with reference to FIGS. 12 and 13. The determination processing unit 140 receives the Lev0 and Lev2 as inputs, and outputs a determination result according to the processing shown in FIG.

  The content determination index calculation unit 141 in FIG. 12 calculates the content determination index MSdet1 as shown in Equation 5.

  Next, the determination result calculation unit 142 in FIG. 12 calculates the determination result according to the flowchart of FIG.

  In FIG. 13, in a determination step 1141, it is determined whether Lev0 is smaller than a preset threshold value (Lev0thd) (for example, 10 dBμV). If it is smaller, it is determined that “the received radio wave is too small to determine the broadcast content” and it is not determined whether it is music or voice.

  Next, in a determination step 1142, it is determined whether or not MSdet1 is larger than a preset threshold value (MSthd1) (for example, 0.2). If it is larger, it is determined that the modulation content of the input signal is music. According to Equation 5, MSdet1 increases as the number of signals that have passed through the low-pass filter decreases, so that it can be determined as a music signal. Conversely, the more signals that have passed through the low-pass filter, the smaller MSdet1 is, so it is determined that the signal is an audio signal.

  Although it is determined in the determination step 1141 whether or not the received radio wave is small, it may be determined whether the sound is music or voice for all frequencies without making this determination.

(Embodiment 4)
The fourth embodiment is characterized in that the music voice determination device 70 is different from the first and third embodiments. The music voice determination device 70 will be described.

  FIG. 14 is a functional block diagram of the music voice determination device 70 of the fourth embodiment.

  The zeroth signal level calculation unit 120 is a device that uses the I signal (Isig) and the Q signal (Qsig) as input signals, calculates the amplitude level Lev0 as shown in Equation 1, and outputs it.

  The first BPF 111 is a bandpass filter having a passband of 23 kHz to 53 kHz, and an Ibpf1 signal obtained by performing bandpass filter processing on the I signal and the Q signal using the I signal (Isig) and the Q signal (Qsig) as input signals. (Ibpf1sig), a device that outputs a Qbpf1 signal (Qbpf1sig). Here, the pass band of the first BPF is not limited to 23 kHz to 53 kHz.

  The first signal level calculation unit 121 receives the Ibpf1 signal (Ibpf1sig) and the Qbpf1 signal (Qbpf1sig) output from the first BPF 111, calculates the amplitude level Lev1 as shown in Equation 2, and outputs it. It is.

  The second BPF 112 is a low-pass filter having a passband of 0 kHz to 15 kHz. The Ibpf2 signal (Ibpf2sig) is obtained by using the I signal (Isig) and the Q signal (Qsig) as input signals and performing low-pass filter processing on the I signal and Q signal. ), A device that outputs a Qbpf2 signal (Qbpf2sig). Here, the pass band of the second BPF is not limited to 0 kHz to 15 kHz.

  The second signal level calculation unit 122 receives the Ibpf2 signal (Ibpf2sig) and the Qbpf2 signal (Qbpf1sig) output from the second BPF 112, calculates the amplitude level Lev2 as shown in Equation 4, and outputs it It is.

  The determination processing unit 150 is a device that receives the amplitude level Lev0, the amplitude level Lev1, and the amplitude level Lev2 and outputs a determination result.

  A specific operation of the determination processing unit 150 will be described with reference to FIGS. 15 and 16. The determination processing unit 150 receives the Lev0, Lev1, and Lev2 as inputs, and outputs a determination result according to the process shown in FIG.

  The content determination index calculation unit 151 in FIG. 15 calculates the content determination index MSdet2 as shown in Equation 6.

  Next, the determination result calculation unit 152 in FIG. 15 calculates the determination result according to the flowchart of FIG.

  In FIG. 16, it is determined in decision step 1151 whether Lev0 is smaller than a preset threshold value (Lev0thd) (for example, 10 dBμV). If it is smaller, it is determined that “the received radio wave is too small to determine the broadcast content” and it is not determined whether it is music or voice.

  Next, at decision step 1152, it is determined whether Msdet2 is greater than a preset threshold value (MSthd2) (for example, 0.2). If it is larger, it is determined that the modulation content of the input signal is music. Otherwise, it is determined that the modulation content of the input signal is voice. The numerator Lev1 mainly indicates the number of music signals, and the denominator Lev2 mainly indicates the number of audio signals. Therefore, when Msdet2 is large, it can be determined as a music signal.

  Although it is determined in the determination step 1151 whether or not the received radio wave is small, it may be determined whether the sound is music or voice for all frequencies without making this determination.

  In the third and fourth embodiments, the determination result may not be output as music or voice, but may be output as a percentage of music as in the second embodiment.

  In the first to fourth embodiments, in the 0th signal level calculation unit 120, the first signal level calculation unit 121, and the signal level calculation unit 122 of the second signal, the signal levels as shown in Equation 1, Equation 2, and Equation 4 However, in order to improve music sound determination accuracy, a temporal average value and a peak hold value such as signal levels Lev0, Lev1, and Lev2 may be adopted as the signal level.

(Embodiment 5)
In the first to fourth embodiments, the music voice determination is performed on the IQ signal that is the output of the quadrature detection unit 31, but in the fifth embodiment, the output of the second FE unit 21 is as shown in FIG. It is characterized in that music voice determination is performed for a certain IF signal.

  In this case, in the music voice determination device 70, for example, in the case of the configuration of FIG. 14 of the fourth embodiment, the bands of the BPF 111 and the BPF 112 are different, and when the intermediate frequency of the IF signal is 10.7 MHz, the BPF 111 The band is from 10.723 MHz to 10.753 MHz, and the band of the BPF 112 is from 10.7 MHz to 10.715 MHz (or 10.8585 MHz to 10.715 MHz). Here, the intermediate frequency is not limited to 10.7 MHz, and the pass band of the BPF is not limited.

  In addition, it is desirable that the signal level calculation units 120, 121, and 122 use envelope detection or the like.

  Moreover, it is needless to say that not only the configuration of FIG. 14 but also the music voice determination for IF signals can be applied to other embodiments.

  By doing so, there is a merit that the second quadrature detector becomes unnecessary.

  In the first to fourth embodiments described above, the music voice determination device can also determine the modulation content using the output of the band filter added for other functions such as measures for adjacent interference. It is. This eliminates the need for a band filter.

  In addition, each BPF in Embodiments 1 to 5 described above corresponds to an example of the frequency filter of the present invention.

(Embodiment 6)
In the first to fourth embodiments, the music voice determination is performed on the IQ signal that is the output of the quadrature detection unit 31, but in the sixth embodiment, the signal received by the antenna unit is branched and the music voice is split. The input signal of the determination device is used, and the music voice determination is performed on the signal. For example, as shown in FIG. 18, this can be realized by branching a signal received by the antenna unit 10 and directly inputting the branched signal to the music voice determination device 70.

  In this case, in the music voice determination apparatus 70, for example, in the case of the configuration of FIG. 14 of the fourth embodiment, the BPF 111 and the BPF 112 have different bands, and a signal branched from the signal received by the antenna unit 10 is input signal. When performing processing on an 80 MHz signal, the bandwidth of the BPF 111 is 80.23 MHz to 80.53 MHz, and the bandwidth of the BPF 112 is 80.0 MHz to 80.015 MHz (or 79.985 MHz to 80.015 MHz). To. Here, when the frequency to be processed, that is, the frequency of the broadcast wave whose broadcast content is to be determined is different, the passbands of the BPF 111 and the BPF 112 are changed.

  In addition, it is desirable that the signal level calculation units 120, 121, and 122 use envelope detection or the like.

  In addition, the point that the signal received by the antenna unit 10 is branched and used as the input signal of the music voice determination device 70, and the music voice determination is performed on the signal can be applied to other embodiments. Nor.

  By doing so, there is a merit that the second FE unit and the second quadrature detector are unnecessary.

  In addition, each BPF in Embodiment 1-6 mentioned above respond | corresponds to the example of the frequency filter of this invention.

  In the first to fifth embodiments described above, the music sound determination device can also determine the modulation content using the output of the band filter added for other functions such as measures for adjacent interference. It is. This eliminates the need for a band filter.

  In each of the above-described embodiments, each unit such as the quadrature detection unit and the FE unit may realize their functions by digital processing using DSP, FPGA, or the like in addition to analog processing.

  The program of the present invention is a program that causes a computer to execute the operation of all or part of the above-described music sound determination method of the present invention, and is a program that operates in cooperation with the computer.

  Moreover, the said one part step of this invention means one or several steps in those some steps.

  Further, one usage form of the program of the present invention may be an aspect in which the program is recorded on a recording medium such as a ROM readable by a computer and operates in cooperation with the computer.

  Also, one use form of the program of the present invention is an aspect in which the program is transmitted through a transmission medium such as the Internet and a transmission medium such as light, radio wave, and sound wave, read by a computer, and operates in cooperation with the computer. Also good.

  The computer of the present invention described above is not limited to pure hardware such as a CPU, and may include firmware, an OS, and peripheral devices.

  As described above, the configuration of the present invention may be realized by software or hardware.

  According to the music sound determination apparatus of the present invention, it is possible to determine broadcast contents without using the output of the FM demodulated signal of the FM demodulator, and according to the FM radio receiver of the present invention, a new FM demodulator is provided. Broadcast contents can be determined without adding, that is, no increase in cost, or cost increase can be suppressed, and a music voice determination function can be added to the FM radio receiver, receiving FM radio waves from multiple broadcast stations. This is useful in the field of FM radio receivers that can easily understand the situation of other stations while listening to the target broadcast.

Block diagram of a radio receiver according to Embodiment 1 of the present invention The block diagram of the music audio | voice determination apparatus in Embodiment 1 of this invention. The figure which shows the structure of the determination process part in Embodiment 1 of this invention. The flowchart which shows operation | movement of the determination process part in Embodiment 1 of this invention. The block diagram which shows the usage example of Embodiment 1 of this invention Flowchart diagram of the usage example of FIG. The figure which shows an example of the display part in the usage example of FIG. The figure which shows an example of the content determination parameter | index MSdet in Embodiment 2 of this invention The flowchart which shows operation | movement of the determination process part in Embodiment 2 of this invention. The figure which shows an example of the display part in Embodiment 2 of this invention The block diagram of the music audio | voice determination apparatus in Embodiment 3 of this invention. The figure which shows the structure of the determination process part in Embodiment 3 of this invention. The flowchart which shows operation | movement of the determination process part in Embodiment 3 of this invention. The block diagram of the music audio | voice determination apparatus in Embodiment 4 of this invention. The figure which shows the structure of the determination process part in Embodiment 4 of this invention. The flowchart which shows operation | movement of the determination process part in Embodiment 4 of this invention. Block diagram of a radio receiver according to Embodiment 5 of the present invention Block diagram of a radio receiver according to Embodiment 6 of the present invention Block diagram of a conventional radio receiver

Explanation of symbols

1 FM radio receiver 2 Judgment operation button 3 Display unit 10 Antenna 20 First FE unit (front end unit)
21 2nd FE part (front end part)
DESCRIPTION OF SYMBOLS 30 1st orthogonal detection part 31 2nd orthogonal detection part 40 FM demodulation part 50 Stereo demodulation part 60 Speaker part 70 Music voice determination apparatus 90 Conventional music voice determination apparatus 100 Input part 111 1st BPF
112 Second BPF
120 0th signal level calculation unit 121 1st signal level calculation unit 122 2nd signal level calculation unit 130 determination processing unit 131 content determination index calculation unit 132 determination result calculation unit 140 determination processing unit 141 content determination index calculation unit 142 Determination result calculation unit 150 Determination processing unit 151 Content determination index calculation unit 152 Determination result calculation unit 1131 Determination processing unit determination step 1132 Determination processing unit determination step 1133 Determination processing unit determination step 1141 Determination processing unit determination step 1142 Determination processing Judgment step of part 1151 Judgment step of judgment processing part 1152 Judgment step of judgment processing part 3001 Part of display part 3002 Part of display part 3003 Part of display part

Claims (16)

An input unit for inputting an FM modulated signal;
A music voice determination apparatus comprising: a determination processing unit that determines whether the content of the FM modulated signal input from the input unit is a music signal or a voice signal.   The music sound determination apparatus according to claim 1, wherein the FM-modulated signal input to the input unit is an orthogonally detected IQ signal.   The music voice determination device according to claim 1, wherein the FM-modulated signal input to the input unit is an IF signal converted into an intermediate frequency band. In addition, it comprises one or more frequency filters,
The said determination process part performs the content determination of the said signal using the filter signal after letting the input signal input from the said input part pass the said frequency filter at least. 4. The music voice determination device according to any one of 3 above.   The music sound determination apparatus according to claim 4, wherein the determination processing unit performs content determination of the signal using the input signal and the filter signal input from the input unit. The frequency filter is a plurality of filters having different frequencies to be processed,
5. The music sound determination apparatus according to claim 4, wherein the content of the signal is determined using a plurality of filter signals processed by the different frequency filters.   The music sound determination apparatus according to claim 4, wherein the frequency filter is a band-pass filter or a low-pass filter.   The music sound determination apparatus according to claim 1, wherein the determination process performed by the determination processing unit is a final determination process of a music signal or a sound signal or a preliminary process for performing the determination. An antenna for receiving FM-modulated radio waves transmitted from a broadcasting station;
A first FE unit that converts the received FM modulated signal into an intermediate frequency band and outputs a first IF signal;
A first quadrature detector for quadrature detecting the first IF signal and outputting a first IQ signal;
An FM demodulator for FM demodulating the first IQ signal and outputting an FM demodulated signal;
Stereo demodulating the FM demodulated signal and outputting a stereo signal;
A speaker unit for reproducing the stereo signal and providing broadcast content;
The music voice determination device according to claim 1, which processes an FM-modulated signal received by the antenna;
FM radio receiver. A second FE unit that receives an FM-modulated signal received by the antenna, converts the signal to an intermediate frequency band, and outputs a second IF signal;
10. The FM radio receiver according to claim 9, wherein the music sound determination apparatus inputs and processes the second IF signal. 11. A second FE unit that receives an FM modulated signal received by the antenna, converts the signal to an intermediate frequency band, and outputs a second IF signal;
A second quadrature detection unit that quadrature-detects the second IF signal and outputs a second IQ signal;
10. The FM radio receiver according to claim 9, wherein the music voice determination device receives and processes the second IQ signal. 11. The frequency received by the first FE unit is different from the frequency received by the second FE unit,
The FM radio receiver according to claim 10 or 11, wherein the music voice determination device performs the determination on the content of an output signal having a frequency different from the frequency of the signal output from the speaker.   10. The FM radio reception according to claim 9, wherein the music sound determination device determines the content by using an output of a frequency filter added for other functions such as a countermeasure for adjacent interference. Machine. Determination operation instruction means for instructing driving of the music sound determination device;
A display unit for displaying a result determined by the music sound determination device,
In accordance with an instruction from the determination operation instruction means, the second FE unit of the music voice determination device receives a reception frequency so as to receive another frequency different from the frequency received by the first FM unit. 11. The broadcast content of each broadcasting station is determined in order by switching the frequency, and after the determination of the broadcast content of the reception frequency is completed, further switching to another reception frequency. The FM radio receiver according to 11. An input step for inputting an FM modulated signal;
And a determination step of determining whether the content of the input FM modulated signal is a music signal or a sound signal. An input step of inputting an FM-modulated signal according to the music sound determination method according to claim 15,
A program for causing a computer to execute a determination processing step of determining whether the content of the input FM modulated signal is a music signal or a sound signal.

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