WO2006054702A1 - 受信装置および受信方法 - Google Patents
受信装置および受信方法 Download PDFInfo
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- WO2006054702A1 WO2006054702A1 PCT/JP2005/021260 JP2005021260W WO2006054702A1 WO 2006054702 A1 WO2006054702 A1 WO 2006054702A1 JP 2005021260 W JP2005021260 W JP 2005021260W WO 2006054702 A1 WO2006054702 A1 WO 2006054702A1
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G3/00—Gain control in amplifiers or frequency changers without distortion of the input signal
- H03G3/20—Automatic control
- H03G3/30—Automatic control in amplifiers having semiconductor devices
- H03G3/34—Muting amplifier when no signal is present or when only weak signals are present, or caused by the presence of noise signals, e.g. squelch systems
- H03G3/344—Muting responsive to the amount of noise (noise squelch)
Definitions
- the present invention relates to a receiving device and a receiving method.
- the use of the present invention is not limited to the above-described receiving apparatus and receiving method.
- a receiving apparatus that performs mobile reception of FM broadcasts for example, an in-vehicle receiving apparatus, changes the reception status of FM radio signals (specifically, received electric field strength, etc.) as the reception position changes. It has an ARC (automatic reception control) function that changes the reception state appropriately according to the change in the reception state (see, for example, Patent Document 1.)
- ARC automatic reception control
- the receiving apparatus includes an antenna 101, an RF unit 102 that also configures RF circuit force, a mixer (MIX) 103, an IF unit 104 that also configures IF circuit force, and an electric field strength.
- a signal meter unit 105 provided with a meter, an FM detection unit 106, an ARC unit 107, and a stereo demodulation unit 108 composed of an MPX circuit are provided as main components.
- Each of these constituent elements 101 to 108 is connected by a transmission line such as a substrate pattern or IC internal wiring.
- the radio wave signal RF unit 102 received by the antenna 101 is amplified at a high frequency.
- the amplified signal is output to IF section 104 via mixer 103.
- IF section 104 the input signal is converted to an intermediate frequency and amplified.
- the signal processed by IF section 104 is output to signal meter section 105 and also output to FM detection section 106.
- the signal meter unit 105 detects the electric field intensity level (hereinafter, abbreviated as the electric field level) of the signal output from the IF unit 104, and the detection result of the electric field level (hereinafter, the electric field level signal) is detected. And output to the ARC unit 107.
- the FM detection unit 106 acquires an FM detection signal from the output of the IF unit 104, and outputs the FM detection signal to the ARC unit 107 as an audio signal.
- the ARC unit 107 to which the electric field level signal and the FM detection signal are input corresponds to the reception state of the FM radio signal (specifically, the electric field level and noise level of the FM radio signal as described later). Separate control, high cut control, and mute control are appropriately performed on the FM detection signal.
- the FM detection signal subjected to each control in the ARC unit 107 is output to the stereo demodulation unit 108.
- the FM detection signal input to the stereo demodulator 108 is a composite signal composed of a main signal, a pilot signal, and a sub signal.
- the main signal is a left and right signal (ie, an L signal and an R signal).
- (L + R) signal which is the sum of the two
- the sub-signal is represented as (L ⁇ R) signal, which is the difference between the left and right signals.
- Stereo demodulation section 108 adds the main signal and the sub signal, that is, the (L + R) signal and the (L R) signal.
- the left and right stereo signals can be acquired, in other words, the FM detection signal can be separated into the left and right output signals.
- the reception state of the receiving apparatus is automatically controlled according to the radio wave condition of the FM radio wave signal by the separation control, the high cut control, and the mute control in the ARC unit 107. .
- the separation control controls the high cut control
- the mute control controls the ARC unit 107.
- the ARC unit 107 separation control for automatically and continuously switching the reproduction mode to the stereo mode power monaural mode according to the decrease in the electric field level of the received FM radio signal, and according to the decrease in the electric field level.
- High cut control that continuously and automatically reduces the high frequency component of the FM detection signal
- mute control that automatically and continuously reduces the output level of the FM detection signal as the electric field level decreases are executed.
- the electric field levels at which separation control, high cut control, and mute control are started are set in advance, and the electric field level detected by the signal meter unit 105 is When this set electric field level is reached, each control is executed.
- FIG. 2 is a diagram for explaining a reception state control operation in ARC section 107 of FIG.
- a graph 201 shows a sub-signal (ie, (L ⁇ R) signal) of the FM detection signal acquired by the FM detection unit 106 in FIG.
- Graph 202 and graph 203 show the 1 kHz component and the 10 kHz component of the FM detection signal.
- the horizontal axis indicates the electric field level of the FM radio wave signal detected by the signal meter unit 105 in FIG. 1, and the reception state is better as the electric field level is larger.
- the right vertical axis indicates the separation (degree of separation) of the graph 202, and the greater the separation (degree of separation), the better the stereo reproduction is realized.
- the left vertical axis represents the output levels of the graph 202 and the graph 203.
- the ARC unit 107 in FIG. 1 performs a separation that increases the separation (separation) of the FM detection signal. -Controls the case. Specifically, when power is applied, the amount of control in the separation control operation is reduced, and the separation is promoted to promote separation of the L signal and the R signal. As a result, the stereo demodulator 108 in FIG. 1 realizes FM broadcasting with good stereo mode using the separated L and R signals.
- the ARC unit 107 in FIG. 1 performs separation control so as to suppress the separation of FM detection signals. Specifically, when power is applied, the amount of control in the separation control operation is increased to suppress separation and suppress separation of the L and R signals. When the electric field level further decreases and reaches V2, the control amount in the separation control operation is further increased, so that the L signal and the R signal are not separated. As a result, the stereo mode power is switched to the monaural mode in the stereo demodulator 108 in FIG.
- the ARC unit 107 in FIG. 1 stops the removal of the 10 kHz component of the FM detection signal (ie, the high cut control operation) when the FM radio signal is V3 or higher. Or suppress. Specifically, when power is applied, the control amount in the high cut control operation is reduced, and the high cut control operation is stopped or suppressed. On the other hand, when the electric field level falls below V3, the ARC unit 107 in FIG. 1 increases the control amount in the high cut control operation. As a result, the high cut control operation is promoted and the 10 kHz component is reduced.
- ARC unit 107 in Fig. 1 stops the removal of all band components of FM detection signal (ie, mute control operation) when the FM radio signal is V4 or higher. Or suppress. Specifically, when power is applied, the control amount in the mute control operation is reduced, and the mute control operation is stopped or suppressed. On the other hand, the electrolysis level of the FM radio signal is When the voltage drops below V4, the ARC unit 107 in FIG. 1 increases the control amount in the mute control operation. Thereby, the mute control operation is promoted, and the entire band component is reduced.
- the control amount in each of the separation control, the high cut control, and the mute control is appropriately set according to the electric field level of the FM radio wave signal. It has been decided. As a result, it is possible to stably realize an appropriate reception state corresponding to the electric field fluctuation of the FM radio signal.
- each control when each control is performed based on the electric field level of the FM radio signal, each control may be performed according to the noise level included in the force FM radio signal described as V.
- V the noise level included in the force FM radio signal described as V.
- the weaker the noise level the more the control amount in each control of separation control, high cut control and mute control is reduced, and the control operation is suppressed.
- Each control action is promoted by increasing the control amount as it increases. Normally, each control operation is performed according to the electric field level and noise level of the FM radio signal.
- Patent Document 1 Japanese Utility Model Publication No. 6-13247
- the above-described automatic control of the reception state in the ARC unit 107 as described above is effective in reducing noise as needed. Achieving a good listening experience. Therefore, in the ARC unit 107, in order to reduce noise, the control amount power in each control of the separation control, the high cut control, and the mute control is preset according to the electric field level and the noise level. Each control is executed based on the setting.
- FM source mediated by FM radio signals
- Examples of information on the FM source include information on the type of the FM source, information on the playback mode of the FM source, and the like.
- the information is information about whether the source is a music source or an audio source. Note that here, FM sources that are also composed of human speech are called audio sources.
- the FM detection signal when the FM source is a music source, the FM detection signal includes a high-frequency band component (ie, a high-frequency component), whereas when the FM source is an audio source, the FM detection signal Does not contain high frequency components. Therefore, under the situation where the electric field level and noise level are the same, the amount of control in the ARC section 107 is increased in the case of the audio source than in the case of the music source, and the high cut is promoted. It is possible to achieve a better audibility.
- a high-frequency band component ie, a high-frequency component
- the control amount in each control of the separation control, the high cut control, and the mute control is set according to the source type and the output mode. It needs to be set appropriately.
- the amount of control in each control is set based on the electric field level and the noise level, so that appropriate reception state control corresponding to the FM source can be realized. I can't.
- the receiving device detects the electric field level and noise level of the received broadcast radio signal, and based on the detection result, the reception state of the broadcast radio signal
- a receiving device comprising a receiving control means for controlling the broadcast signal further comprising source discriminating means for acquiring the broadcast radio wave signal power information relating to the broadcast source transmitted via the broadcast radio wave signal; The control means further controls the reception state based on the information on the broadcast source acquired by the source determination means.
- the receiving method according to the invention of claim 11 includes a detection step of detecting an electric field level and a noise level of a received broadcast radio wave signal, and based on a result of the detection!
- a reception determination step including a reception control step for controlling a reception state of the broadcast radio signal, and a source determination step for acquiring the broadcast radio signal power information relating to a broadcast source transmitted through the broadcast radio signal.
- the reception control step further includes the source format. The reception state is controlled based on information on the broadcast source acquired in a separate process.
- FIG. 1 is a block diagram showing a configuration of a conventional receiving apparatus.
- FIG. 2 is a diagram for explaining the reception state control operation in the ARC unit of FIG. 1.
- FIG. 3 is a block diagram showing a configuration of a receiving apparatus according to an embodiment of the present invention.
- FIG. 4 is a block diagram showing a configuration of an ARC section of the receiving apparatus according to Embodiment 1 of the present invention.
- FIG. 5 is a diagram for explaining an electric field level signal.
- FIG. 6 is a diagram for explaining a noise level signal.
- FIG. 7 is a diagram for explaining a source type determination signal.
- FIG. 8 is a diagram for explaining a reproduction mode determination signal.
- FIG. 9 is a flowchart for explaining the operation of the high cut control amount adjusting circuit.
- FIG. 10 is a schematic diagram showing the contents of data stored in a storage unit.
- FIG. 11 is a block diagram illustrating an example of a configuration of a source determination unit.
- FIG. 12 is a diagram for explaining a source type determining operation and a playback mode determining operation in the source determining unit in FIG. 11.
- FIG. 13 is a diagram for explaining a source type determination operation and a playback mode determination operation in the source determination unit of FIG. 11.
- FIG. 14 is a diagram for explaining a source type determination operation and a playback mode determination operation in the source determination unit of FIG. 11.
- FIG. 15 is a block diagram showing another example of the configuration of the source determination unit.
- FIG. 16 is a diagram for explaining a source type determining operation and a playback mode determining operation in the source determining unit in FIG.
- FIG. 17 is a diagram showing source type determination operation and playback mode in the source determination unit of FIG. It is a figure for demonstrating a mode discrimination
- FIG. 18 is a diagram for explaining a source type determination operation and a playback mode determination operation in the source determination unit of FIG.
- FIG. 19 is a flowchart for explaining the operation of the high cut control amount adjusting circuit according to the second embodiment of the present invention.
- This embodiment is a receiver that can stably maintain a good reception state and can realize an appropriate reception state according to the FM source.
- the purpose is to provide.
- FIG. 3 is a block diagram showing a configuration of a receiving apparatus according to the embodiment of the present invention.
- the receiving device includes an antenna 301, an RF unit 302 that also has RF circuit power, a mixer (MIX) 303, an IF unit 304 that also has IF circuit power, and an electric field strength meter. It comprises a stereo demodulator 305, an FM detector 306, a source half IJ additional U 307, an ARC 308, and a stereo demodulator 309 composed of an MP X circuit card.
- Each of these components 301 to 309 is connected to each other by a transmission line 310 formed by a substrate pattern, IC internal wiring, or the like.
- an antenna 301, an RF unit 302, a mixer 303, and an IF unit 304 are connected in series via a transmission line 310 in this order.
- the output side of the IF unit 304 and the input side of the ARC unit 308 have three transmission lines 310 formed in parallel, that is, the transmission line 310 having the signal meter unit 305 disposed therebetween, and FM detection.
- the part 306 is connected by the transmission line 310 disposed therebetween, and the source discriminating unit 307 is connected by the transmission line 310 disposed therebetween.
- the output side of the ARC unit 308 is further connected to the input side of the stereo demodulation unit 309 via the transmission line 310.
- an FM radio wave signal received by the antenna 301 is amplified at a high frequency in the RF unit 302.
- the amplified signal is output to the IF unit 304 via the mixer 303.
- IF section 304 the input signal is converted to an intermediate frequency and amplified.
- the signal processed by IF section 304 is output to signal meter section 305, FM detection section 306, and source determination section 307 through each transmission line 310.
- the electric field level of the signal output from the IF unit 304 is detected.
- the detection result force electric field level signal is output to the ARC unit 308.
- the FM detection unit 306 also detects the FM signal from the signal power output from the IF unit 304 and outputs it to the ARC unit 308 as an FM detection signal corresponding to the audio signal.
- the noise level of the signal is also detected based on the high frequency component included in the FM detection signal.
- the detection result force is output to the ARC unit 308 as a noise level signal.
- noise level detection is performed in FM detection section 306
- signal meter section 305 It may be a configuration.
- the noise level is detected based on the high frequency component included in the FM radio signal input to the signal meter unit 305.
- the detection result power is output to the ARC unit 308 as a noise level signal.
- the source determination unit 307 performs source determination, specifically, source type determination and source playback mode determination on the signal output from the IF unit 304.
- the determination result is output to the ARC unit 308 as a source information signal, that is, a source type determination signal and a playback mode determination signal.
- separation control is performed on the FM detection signal with an appropriate control amount in accordance with the input electric field level signal, noise level signal, and reproduction mode determination signal.
- high-cut control is performed on the FM detection signal with an appropriate control amount in accordance with the input electric field level signal, noise level signal, and source type determination signal.
- mute control is performed on the FM detection signal with an appropriate control amount according to the electric field level signal and the noise level signal.
- Stereo demodulator 309 obtains the left and right stereo signals (ie, L signal and R signal) of the FM detection signal power by the same method as in the past.
- the radio wave condition (specifically, the electric field level and the noise level) of the FM radio wave is determined by the separation control, the high cut control, and the mute control in the ARC unit 308.
- the reception status is automatically controlled appropriately and appropriately according to the FM source (specifically, the source type and playback mode). As a result, even if fluctuations occur in the radio wave conditions of FM radio waves, it is possible to stably achieve good reception, and it is possible to realize appropriate reception corresponding to the source.
- the receiving apparatus it is possible to perform reception state control focusing on noise reduction, and it is possible to execute appropriate reception state control corresponding to the contents of the FM source. Become. Therefore, the receiving apparatus can realize reception state control satisfying both viewpoints from the viewpoint of noise reduction and the contents of the FM source. In such a receiving apparatus, it is possible to realize a better audibility than in the conventional case where control is executed focusing only on the noise level reduction key.
- Example 1
- FIG. 4 is a block diagram showing the configuration of the ARC unit 308 (see FIG. 3) of the receiving apparatus according to Embodiment 1 of the present invention.
- the ARC unit 308 includes a reception control unit 308a, a storage unit 308b, and a search unit 308c.
- the ARC unit 308 having such a configuration corresponds to reception control means.
- the reception control unit 308a of the ARC unit 308 includes a mute control unit 401 that performs mute control on the input FM detection signal, a high cut control unit 402 that performs high cut control, and a separation control that performs separation control. Part 403.
- the mute control unit 401 includes a mute circuit 404 and a mute control amount adjustment circuit 405 that adjusts the setting of the mute circuit 404 to adjust the control amount in the mute control operation executed by the circuit.
- the high cut control unit 402 includes a noise cut circuit 406, and a high cut control amount adjustment circuit 409 that adjusts a setting of the high cut circuit 406 to adjust a control amount in a high cut control operation executed by the circuit.
- the high cut circuit 406 includes an LPF 407 and a VCA 408, and can be directly input to the signal power VCA 408 output from the mute circuit 404 and can be input to the VCA 408 via the signal power SLPF 407.
- a transmission line is formed in parallel.
- the LPF 407 and the VCA 408 are controlled by a no-cut control amount adjustment circuit 409, and a high-cut control operation is executed according to the control amount set by the no-cut control amount adjustment circuit 409.
- the separation control unit 403 includes a separation circuit 410, a separation control amount adjustment circuit 412 that adjusts a setting in the separation circuit 410 and adjusts a control amount in a separation control operation executed by the circuit.
- the separation circuit 410 includes a VCA 411 and is input to the signal power VCA 411 output from the high cut control unit 402.
- the VCA 411 is controlled by the separation control amount adjustment circuit 412, and executes a separation control operation according to the control amount set by the separation control amount adjustment circuit 412.
- the storage unit 308b includes a control amount of the high cut control operation in the high cut control unit 402 of the reception control unit 308a, and a separation control operation control in the separation control unit 403. Stores data (specifically, data shown in Fig. 10 to be described later) to set the volume appropriately according to the electric field level and noise level of the FM radio signal and the contents of the FM source.
- the search unit 308c is based on the electric field level signal, the noise level signal, the source type determination signal, or the playback mode determination signal input to the high cut control amount adjustment circuit 409 and the separation control amount adjustment circuit 412. Accordingly, the optimum control amount is retrieved from the data stored in the storage unit 308b.
- the FM radio wave signal is sequentially input to the RF unit 302, the mixer 303, and the IF unit 304 and subjected to each processing. Further, the signal that has passed through the IF unit 304 is output to the signal meter unit 305, the FM detection unit 306, and the source determination unit 307.
- the signal meter unit 305 detects the electric field level of the input FM radio signal. Then, as shown in FIG. 4, the detection result is input as an electric field level signal to the mute control amount adjustment circuit 405, the high cut control amount adjustment circuit 409, and the separation control amount adjustment circuit 412 of the ARC unit 308, respectively. Is done.
- the FM detection unit 306 in FIG. 3 acquires the FM detection signal as the output signal power of the IF unit 304 and also detects the noise level of the FM detection signal.
- the FM detection signal acquired by the FM detection unit 306 is input to the ARC unit 308, and is sequentially output to the stereo demodulation circuit through the mute circuit 404, the high cut circuit 406, and the separation circuit 410.
- the detection result of the noise level is input as a noise level signal to the mute control amount adjustment circuit 405, the high cut control amount adjustment circuit 409, and the separation control amount adjustment circuit 412 of the ARC unit 308, respectively.
- the source discriminating unit 307 in FIG. 3 determines whether the FM source source type is either an audio source or a music source from the output signal of the IF unit 304, and the FM source playback mode is monaural mode. Determine whether the stereo mode is suitable for the shift. Details of this determination method will be described later with reference to FIG. As shown in Figure 4, the source discriminator 3 The information of the source type acquired in 07 (see FIG. 3) is output to the high cut control amount adjustment circuit 409 of the A RC unit 308 as a source type determination signal. On the other hand, the playback mode information of the FM source is output to the separation control amount adjustment circuit 412 of the ARC unit 308 as a playback mode discrimination signal.
- the ARC unit 308 Based on the electric field level signal, noise level signal, source type determination signal, and playback mode determination signal input as described above, the ARC unit 308 performs mute control, no-cut and i-cut for the FM detection signal. Each control of control and separation control is appropriately performed.
- the mute control amount adjustment circuit 405, the high cut control amount adjustment circuit 409, and the separation control amount adjustment circuit 412 of the ARC unit 308 correspond to each input signal.
- the control amount of each control operation in the mute circuit 404, the high cut circuit 406, and the separation circuit is adjusted.
- FIG. 5 is a diagram for explaining the electric field level signal.
- FIG. 6 is a diagram for explaining the noise level signal.
- FIG. 7 is a diagram for explaining the source type determination signal.
- FIG. 8 is a diagram for explaining the playback mode determination signal.
- the electric field level signal is set to a numerical value in each of 0 to 10 in order from the strongest electric field level to the weakest electric field level.
- the noise level signal has a low noise level and a numerical value is set in each step of 0 to 10 in that order.
- the source type determination signal is +2 when it can be clearly identified as an audio source, and is 2 when it can be clearly identified as a music source. If the music source cannot be discriminated as a deviation (ie, it is intermediate), the value is set to 0. The numerical value is set as +1 if it is determined to be an audio source, which is not as clear as the state of +2, but as 1 when it is determined that it is a music source but not as clear as the state of 1.
- the playback mode determination signal is +2 when it is clearly possible to determine that playback in monaural mode is appropriate, and clearly that playback in stereo mode is appropriate.
- the value is set to 2 if the discriminability can be discriminated, and the difference between the playback in monaural mode and the playback in stereo mode is suitable! /. . If it is determined that playback in monaural mode is suitable, although it is not as clear as the state of +2, it is determined that playback in stereo mode is appropriate, although it is not as clear as the state of +1, 1-2.
- the numerical value is set as 1 when the case is done.
- the electric field level signal and the noise level signal power thus numerically input are input to the mute control amount adjustment circuit 405 of the A RC unit 308 as shown in FIG.
- the control amount of the mute control operation in the mute circuit 404 is adjusted based on the numerical values of the input electric field level signal and noise level signal.
- the mute control amount adjustment circuit 405 starts the mute control operation of the mute circuit 404.
- the control amount is increased to promote the mute control operation, and as the numerical value of the signal decreases, the control amount is decreased to suppress the mute control operation. To do.
- the mute control amount adjustment circuit 405 sets the control amount of the mute control operation in the mute circuit 404 to zero. Thereby, the mute control operation is not executed.
- the FM detection signal input to the ARC unit 308 via the FM detection unit 306 of FIG. 3 is first input to the mute circuit 404, where the electric field level signal and Mute control based on the level signal.
- the FM detection signal that has passed through the mute circuit 404 is then output to the high cut circuit 406 and is subjected to the following high cut control.
- FIG. 9 is a flowchart for explaining the operation of the high cut control amount adjusting circuit 409 of FIG.
- FIG. 10 is a schematic diagram showing the contents of data stored in the storage unit 308b of FIG.
- the high cut control amount adjusting circuit 409 is based on the numerical values of the electric field level signal, noise level signal, and source type signal. Adjust the control amount of the high cut control operation in the cut circuit 406 (see Fig. 4). Specifically, first, the high cut control amount adjustment circuit 409 (see FIG. 4) acquires the electric field level signal value (step S901), the noise level signal value (step S902), and further, The numerical value of the source type determination signal is acquired (step S903).
- the i-cut control amount adjustment circuit 409 (see FIG. 4) based on the acquired values of the electric field level signal, noise level signal, and source type determination signal, through the search unit 308c (see FIG. 4), the storage unit 308b
- the optimal control value is also searched for the data force of FIG. 10 stored in (see FIG. 4) (step S904), and the optimal control value is obtained (step S905).
- the no-cut control amount adjustment circuit 409 adjusts the control amount in the high-cut control operation of the high-cut circuit 406 (step S906), and executes the high-cut control operation on the circuit 406. (Step S907).
- the optimal control value is set in each stage from 0 to 10, and the no-cut control amount adjustment number circuit 409 does not perform the high-force control operation at all.
- the maximum amount of control is 10 and the amount of control in high-cut control increases as the optimal control value increases.
- the high cut control unit 402 of the ARC unit 308 performs a high cut control operation according to the electric field level signal and the noise level signal in the same manner as in the past, and the source type is also determined based on the source type determination signal. Take this action in consideration. Therefore, the high-cut control operation reduces the noise contained in the FM detection signal, and it is also good to properly correspond to the type of FM source, that is, whether it is a music source or an audio source. Can be realized.
- the FM detection signal processed by the high cut control unit 402 in this manner is then input to the separation circuit 410.
- the separation control operation in the separation circuit 410 is adjusted by the control amount force separation control amount adjustment circuit 412.
- Separation control amount adjustment circuit As in the case of the high-cut control operation shown in FIG. 9 described above, 412 detects the optimum control value for the data force stored in advance in the storage unit 308b (see FIG. 4) via the search unit 308c (see FIG. 4). The separation circuit 410 is controlled based on the obtained optimum control value.
- the separation control amount adjustment circuit 412 uses a numerical value as shown in FIG. 8 as a reproduction mode determination signal instead of the source type determination signal. Is used to control the separation circuit 410. That is, in this case, data in which the numerical value of the playback mode determination signal is set instead of the source type determination signal in the data shown in FIG. 10 is stored in advance in the storage unit 308b (see FIG. 4). The data search is performed based on the electric field level signal, the noise level signal, and the reproduction mode determination signal. Then, the optimal control value of the separation control operation is set by a powerful search, and the separation control amount adjustment circuit 412 adjusts the control amount in the high-cut control operation of the separation circuit 410 based on the optimal control value. Then, the operation is controlled.
- the high cut control unit 402 of the ARC unit 308 performs a separation control operation according to the electric field level signal and the noise level signal as in the conventional case, and further, an appropriate playback mode based on the playback mode determination signal.
- This operation is performed in consideration of the above. Therefore, the separation control operation reduces the noise contained in the FM detection signal, and furthermore, the optimal playback mode of the FM source, that is, either the stereo mode or the monaural mode is set to an appropriate mode. Correspondingly, it is possible to realize a good audibility.
- the FM detection signal processed in this way by the separation control unit 403 is then output to the stereo demodulation unit 309 (see FIG. 3).
- FIG. 11 is a block diagram illustrating an example of the configuration of the source determination unit 307 in FIG.
- the source discriminator 307 includes an FFT (Fast Fourier 'cosine' sine transform) analyzer 1101, a music Z audio source discriminator circuit 1102, and a stereo Z monaural mode discriminator. And another circuit 1103.
- the source discrimination unit 307 receives an output signal from the IF unit 304 (see FIG. 3) or an output signal from the FM detection unit 306 (see FIG. 3). Any of the above signals may be input to the source discriminating unit 307. However, it is preferable that the FM detector 306 (see FIG. 3) be an output signal.
- the FFT analyzer 1101 performs FFT conversion on the signal input to the source determination unit 307, and generates a spectrum for each band. Then, the generated spectrum information is output to the music Z sound source discrimination circuit 1102 and to the stereo / monaural mode discrimination circuit 1103.
- the music Z audio source discriminating circuit 1102 determines whether it is an FM source power music source or an audio source based on the input spectrum information. Determine.
- the FM source is determined according to the presence / absence of the high-frequency component of the acquired spectrum and the output level of the component. Specifically, if the output level of the high frequency component is equal to or higher than a predetermined value, it is determined as a music source, and if it is lower than the predetermined value, it is determined as an audio source.
- the 1S source type determination signal is output to the high cut control amount adjustment circuit 409 (see FIG. 4) of the ARC unit 308 (see FIG. 4) as described above.
- the stereo Z monaural mode discriminating circuit 1103 determines whether the moral mode or the stereo mode is appropriate as the FM source playback mode based on the spectrum information acquired by the FFT analyzer 1101. Determine. Then, this determination result force reproduction mode determination signal is output to the separation control amount adjustment circuit 412 (see FIG. 4) of the ARC unit 308 (see FIG. 4) as described above.
- the FM source for stereo broadcasting is the main signal (ie, (L)
- the stereo / monaural mode discriminating circuit 1103 detects the presence / absence of a sub signal based on the acquired spectrum, and thereby discriminates an appropriate reproduction mode of the FM source.
- a specific determination method in music Z audio source determination circuit 1102 and stereo Z monaural mode determination circuit 1103 will be described below. 12 to 14 are diagrams for explaining the source type determination operation and the playback mode determination operation in the source determination circuit 307 of FIG.
- the high-frequency component A of the main signal indicated by the arrow in the figure, the pilot signal B indicated by the arrow in the figure, and the sub-signal C indicated by the arrow in the figure are processed separately.
- the music Z audio source discrimination circuit 1102 (see Fig. 11) discriminates the source type of the FM source as the music source.
- stereo Z monaural mode discriminating circuit 1103 (see FIG. 11) discriminates that the FM source is suitable for playback in stereo mode!
- the spectrum is acquired by the arrow in the figure.
- the stereo Z monaural mode discriminating circuit 1103 determines the source type of the FM source as the music source.
- a spectrum is acquired for each of main signal A indicated by an arrow in the figure, pilot signal B indicated by an arrow in the figure, and sub-signal C indicated by an arrow in the figure.
- the music Z audio source discrimination circuit 1102 discriminates the source type of the FM source as the audio source, and sub-signal C Therefore, the stereo Z monaural mode discriminating circuit 1103 (see Fig. 11) discriminates that the FM source is suitable for playback in the stereo mode.
- the source determination unit 307 includes the FFT analyzer 1101 .
- a configuration including a wavelet analyzer may also be used.
- the wavelet analyzer is used to display Figs. It becomes possible to acquire the high-frequency component of the main signal as shown in Fig. 4, the spectrum of the pilot signal and sub signal.
- the source discrimination circuit 307 Besides performing spectrum analysis using the FFT analyzer 1101 and the wavelet analyzer, the source discrimination circuit 307 easily separates the high-frequency component and sub-signal of the main signal using BPF. It may be a configuration.
- FIG. 15 is a block diagram illustrating another example of the configuration of the source determination unit 307.
- the source discriminating unit 307 in this case is different from the source discriminating unit 307 of FIG. 11 provided with a point power BPF 1501 instead of the FFT analyzer 1101 of FIG.
- the same components as those in FIG. 11 are denoted by the same reference numerals.
- the BPF 1501 separates the high frequency component of the main signal and the sub signal from the FM radio wave signal.
- Each of the music Z sound source discriminating circuit 1102 and the stereo Z monaural mode discriminating circuit 1103 arranged after the BPF 1501 is based on the high-frequency component and sub-signal of the separated main signal! / Turn to determine the source type and playback mode.
- the source discriminating unit 307 with BPF1501 has a lower discrimination accuracy than the source discriminating unit 307 with the FFT analyzer 1101 and wavelet analyzer in Fig. 11, but the configuration is simplified and the circuit size is reduced. This is effective.
- FIGS. 16 to 18 are diagrams for explaining the source type determination operation and the reproduction mode determination operation in the source determination unit 307 of FIG. Specifically, BPF1501 in Fig. 15 is used.
- V shows the high-frequency component and sub-signal of the main signal separated!
- the music Z audio source discrimination circuit 1102 discriminates the source type of the FM source as a music source.
- the stereo Z monaural mode discriminating circuit 1103 discriminates that the FM source is suitable for reproduction in the stereo mode.
- the stereo Z monaural mode discrimination circuit 1103 determines that the FM source is suitable for playback in stereo mode.
- the music Z audio source determination circuit 1102 determines the source type of the FM source as a music source.
- the high-frequency component D of the main signal indicated by the arrow in the figure and the sub-signal E indicated by the arrow in the figure are respectively acquired. If the output level is lower than the specified value, the music Z audio source discriminating circuit 1102 (see Fig. 15) discriminates the source type of the FM source as an audio source, and the stereo Z monaural mode discriminating circuit 1103 (see Fig. 15). ) Determines that the FM source is suitable for playback in stereo mode because sub-signal E exists.
- the mute control of the FM detection signal is performed according to the information on the electric field level, the noise level, and the contents of the FM source (that is, the source type and the playback mode).
- Each control of high cut control and separation control is performed. Therefore, even if the FM radio wave condition (for example, the electric field level) fluctuates due to movement and the reception condition changes, the noise can be reduced and an appropriate state is maintained according to the FM source. It becomes possible to do. Therefore, it is possible to stably realize a better audibility than a conventional receiving apparatus that performs each control focusing only on noise reduction.
- the receiving device in the second embodiment of the present invention has the same configuration as the receiving device in the first embodiment shown in FIG. 3, and the configuration of the reception control unit 308a of the ARC unit 308 shown in FIG.
- the ARC unit 308 of the second embodiment is configured only by the reception control unit 308a, and the storage unit 308b and the search unit 308c as in the first embodiment are unnecessary.
- Control amount of the high cut control operation in the high cut control unit 402 (both see Fig. 4) of the ARC unit 308 of the embodiment 2 that works well and the separation in the separation control unit 403 (see Fig. 4)
- the method for adjusting the control amount of the control operation is different from that of the first embodiment in the following points.
- the high-cut control operation in the no-cut control unit 402 (see Fig. 4) will be described.
- the characteristic configuration of the second embodiment will be described by exemplifying a control amount adjustment method.
- the separation control operation in the separation control unit 403 (see FIG. 4) is similar to the control amount adjustment method in the high-cut control operation. The control amount is adjusted by this method.
- FIG. 19 is a flowchart for explaining the operation of the high cut control amount adjustment circuit 409 (see FIG. 4) of the high cut control unit 402 (see FIG. 4) of the second embodiment.
- the high cut control amount adjustment circuit 409 receives the input electric field level signal and noise level signal from FIG. And the electric field level signal and noise level signal numerically input as shown in FIG. 6 are acquired (step S1901 and step S1902).
- the high-cut control amount adjustment circuit 409 compares the electric field level signal and noise level signal obtained in this way, and obtains the value of the signal with the larger numerical value as the reference control value. (Step S 1903).
- the high-cut control amount adjustment circuit 409 receives the source type determination signal expressed numerically as shown in FIG. 7 in addition to the electric field level signal and the noise level signal. The numerical value of the signal is acquired (step S 1904). Then, the high cut control amount adjustment circuit 409 (see FIG. 4) determines the optimum of the high cut control adjustment circuit 409 (see FIG. 4) for the high cut circuit 406 from the obtained value of the source type determination signal and the above-described reference control value. A control value is acquired (step S 1905).
- the high cut control amount adjustment circuit 409 includes an adder, and the numerical value of the source type determination signal is added to the reference control value acquired from the electric field level signal and the noise level signal. Is added to calculate the optimal control value.
- the optimal control value is the control of the high-cut control amount adjustment circuit 409 (see Fig. 4) that can reduce noise and realize the optimal no-cut control operation corresponding to the source type. Value.
- the high-cut control amount adjustment circuit 409 (see Fig. 4) that has acquired the optimal control value as described above is based on the optimal control value and the control amount of the high-cut control operation in the high-cut circuit 406 (see Fig. 4). Is adjusted (step S 1906). For example, the optimal control value is set at each stage from 0 to: L0, and the high cut control amount adjustment circuit 409 (see FIG. 4) does not perform the high cut control operation at all. The state that is done in the limit 1 A high cut control operation is promoted as the value increases. Then, the no-cut circuit 406 (see FIG. 4) executes a high-cut control operation based on the control amount adjusted in this way (step S 1907).
- the high cut control unit 402 of the ARC unit 308 of the second embodiment provides the same effects as those described in the first embodiment.
- the separation control unit 403 (both see FIG. 4) of the ARC unit 308 of the second embodiment uses a playback mode discrimination signal instead of the source type discrimination signal.
- the separation control amount adjustment circuit 412 the control amount of the separation control operation similar to that of the high cut control amount adjustment circuit 409 (see FIG. 4) is adjusted. Thereby, the same effects as those described in the first embodiment can be obtained. Therefore, in the receiving apparatus of the second embodiment, the same effects as those described above can be obtained in the receiving apparatus of the first embodiment.
- first and second embodiments are examples of the receiving device according to the present invention, and the receiving device according to the present invention is not limited to this.
- a force exemplifying the case where both the control amount of the high cut control operation and the control amount of the separation control operation are adjusted according to the FM source For example, either the high cut control operation or the separation control operation.
- One control operating force may be controlled according to the SFM source.
- the data related to the setting of the optimum control value in the high cut control operation and the data related to the setting of the optimum control value in the separation control operation are stored in the common storage unit 308b.
- the case where the optimum control value of each control operation is searched for these data forces through the common search unit 308c has been described as an example, but it corresponds to each of the high cut control unit 402 and the separation control unit 403.
- the storage unit 308c and the search unit 308c may be individually arranged in each of the control units 402 and 403.
- the present invention can also be applied to an AM broadcast receiving apparatus.
- AM detection In addition to the electric field level and noise level of the signal, the control amount of the high cut control operation in the ARC section may be adjusted corresponding to the AM source.
- the receiving device according to the present invention as described above can be used for various purposes. For example, it is effective when applied to a vehicle-mounted receiving device such as a vehicle in which the state of FM radio waves varies significantly due to movement. The effect is played.
Abstract
Description
Claims
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Citations (11)
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JPS61257126A (ja) * | 1985-05-08 | 1986-11-14 | 福井 良明 | 水耕栽培装置 |
JPH03259624A (ja) * | 1990-03-09 | 1991-11-19 | Pioneer Electron Corp | ノイズ低減回路 |
JPH0454632A (ja) * | 1990-06-22 | 1992-02-21 | Hitachi Ltd | 演算制御icおよび情報処理装置 |
JPH04301907A (ja) * | 1991-03-28 | 1992-10-26 | Sharp Corp | 音声信号再生装置 |
JPH04359298A (ja) * | 1991-06-06 | 1992-12-11 | Matsushita Electric Ind Co Ltd | 音楽音声判別装置 |
JPH06315016A (ja) * | 1993-04-28 | 1994-11-08 | Sanyo Electric Co Ltd | ラジオ受信機のノイズ低減回路 |
JPH0713586A (ja) * | 1993-06-23 | 1995-01-17 | Matsushita Electric Ind Co Ltd | 音声判別装置と音響再生装置 |
JPH0944984A (ja) * | 1995-07-26 | 1997-02-14 | Sony Corp | ディスク再生装置 |
JP2000124752A (ja) * | 1998-10-20 | 2000-04-28 | Sony Corp | オーディオアンプ |
JP2001245236A (ja) * | 1993-08-03 | 2001-09-07 | Victor Co Of Japan Ltd | テレビジョン受像機 |
JP2003283395A (ja) * | 2002-03-25 | 2003-10-03 | Clarion Co Ltd | ダイバーシティ受信装置 |
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2005
- 2005-11-18 WO PCT/JP2005/021260 patent/WO2006054702A1/ja active Application Filing
- 2005-11-18 JP JP2006545169A patent/JPWO2006054702A1/ja active Pending
Patent Citations (11)
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JPS61257126A (ja) * | 1985-05-08 | 1986-11-14 | 福井 良明 | 水耕栽培装置 |
JPH03259624A (ja) * | 1990-03-09 | 1991-11-19 | Pioneer Electron Corp | ノイズ低減回路 |
JPH0454632A (ja) * | 1990-06-22 | 1992-02-21 | Hitachi Ltd | 演算制御icおよび情報処理装置 |
JPH04301907A (ja) * | 1991-03-28 | 1992-10-26 | Sharp Corp | 音声信号再生装置 |
JPH04359298A (ja) * | 1991-06-06 | 1992-12-11 | Matsushita Electric Ind Co Ltd | 音楽音声判別装置 |
JPH06315016A (ja) * | 1993-04-28 | 1994-11-08 | Sanyo Electric Co Ltd | ラジオ受信機のノイズ低減回路 |
JPH0713586A (ja) * | 1993-06-23 | 1995-01-17 | Matsushita Electric Ind Co Ltd | 音声判別装置と音響再生装置 |
JP2001245236A (ja) * | 1993-08-03 | 2001-09-07 | Victor Co Of Japan Ltd | テレビジョン受像機 |
JPH0944984A (ja) * | 1995-07-26 | 1997-02-14 | Sony Corp | ディスク再生装置 |
JP2000124752A (ja) * | 1998-10-20 | 2000-04-28 | Sony Corp | オーディオアンプ |
JP2003283395A (ja) * | 2002-03-25 | 2003-10-03 | Clarion Co Ltd | ダイバーシティ受信装置 |
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