JP2010272914A - Diversity reception device and reception system switching method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve such a problem that a detection circuit is necessary for detecting reception quality since single reception and diversity reception are switched according to the reception quality such as CNR (Carrier to Noise Ratio) in switching control of single/diversity reception systems of the conventional technology, and the switching operation is not correctly performed in the case where the reception quality is near a switching threshold value. <P>SOLUTION: In the diversity reception device, a reception processing control unit detects switching conditions of an input changing switch through an input changing switch control unit at a time of reception through a wire input terminal, and the reception processing control unit stops signal processing of a second reception processing unit. Since the unit detects only switching condition of the input changing switch in this way, and performs power saving operation, power saving is certainly performed when the reception through the wire input terminal is made even in the case where the reception quality is near the switching threshold value comparing the conventional technology that detects the reception quality such as CNR, etc., and performs the power saving operation. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a diversity receiver and a reception method switching method.

  In recent years, digitalization of broadcasting and communication has progressed. Digitization facilitates the integration of signal processing circuits into LSIs, miniaturization and weight reduction of devices, and portable devices such as mobile phones and portable televisions are widely used. In many cases, the power source of a portable device is a rechargeable battery, and it is important to reduce the power consumption of the device itself for long-time operation.

  Japanese Patent Application Laid-Open No. 2004-133620 discloses a technique for reducing power consumption by controlling power supply ON / OFF to an antenna reception processing unit based on reception quality in a diversity receiver using a plurality of antennas. In Patent Document 1, the reception quality is compared with the reception method switching threshold. When the reception quality is equal to or higher than the reception method switching threshold, among the reception units including a plurality of series antennas, a radio demodulation unit, and a decoding unit, Switch to single reception using any one of the receivers, turn off the power of the remaining receivers that are not used, and if the reception quality is less than the reception system switching threshold, the antennas and radios of both branches A technique for switching to diversity reception using a demodulator and a decoder is disclosed. In Patent Document 1, since a threshold value that is a criterion for determining whether or not to start diversity reception is updated according to the reception rate, switching accuracy between diversity reception and single reception is improved, thereby achieving power saving. When applied to a small electronic device such as a cellular phone, the battery duration can be increased.

International Publication No. 2007/113902

  However, in the conventional single / diversity reception system switching control, a circuit for detecting reception quality is necessary to switch between single reception and diversity reception according to reception quality such as CNR (carrier-to-noise ratio), and the reception quality is near the switching threshold. In this case, there is a problem that the switching operation is not accurately performed.

  Accordingly, an object of the present invention is to solve the above-described problems by switching between single / diversity reception by a more reliable method that is not affected by reception quality, and thereby saving power.

  The diversity receiver of the present invention includes a first antenna and a second antenna that receive radio signals, a first reception processing unit that demodulates radio waves received by the first and second antennas, 2 is exclusively switched between the reception processing unit, a wired input terminal that inputs a signal from the outside to the first reception processing unit, and an input signal of the wired input terminal and an input signal of the first antenna. An input changeover switch and a reception processing control unit that controls the operation of the second reception processing unit, and stops signal processing of the second reception processing unit when the input changeover switch is a wired input; When the input selector switch is an input from the first antenna, the input signal from the first reception processing unit and the second reception processing unit operated by the reception processing control unit is combined with diversity. And diversity combining section which is intended to include a.

  With such a configuration, since single / diversity reception is switched based on the switching state of the input selector switch, it is possible to switch the reception method with a more reliable method that is not affected by the reception quality, thereby realizing power saving.

  Furthermore, in the above invention, a diversity combining control unit that controls the operation of the diversity combining unit and stops the combining process of the diversity combining unit when the input changeover switch is a wired input is provided. It may be.

  In this case, since the combining process of the diversity combining unit can be stopped in addition to the signal processing of the second reception processing unit, further power saving can be realized.

  Furthermore, in the above invention, a power control unit that controls power supply to the second reception processing unit and stops power supply to the second reception processing unit when the input changeover switch is a wired input. May be provided instead of the reception processing control unit.

  In this case, since the power supply itself of the second reception processing unit can be stopped, further power saving can be realized as compared with the case where the signal processing is stopped.

  As described above, according to the diversity receiver of the present invention, since the single / diversity reception is switched based on the switching state of the input selector switch, the reception method is switched by a more reliable method that is not affected by the reception quality, thereby saving power. Can be realized.

FIG. 3 is a block diagram showing a configuration of a diversity receiver in the first embodiment. Flowchart showing the operation of the diversity receiver in the first embodiment FIG. 9 is a block diagram showing a configuration of a diversity receiver in the second embodiment. Flowchart showing the operation of the diversity receiver in the second embodiment. FIG. 10 is a block diagram showing a configuration of a diversity receiver in the third embodiment. Flowchart showing the operation of the diversity receiver in the third embodiment.

(Embodiment 1)
The diversity receiver according to the first embodiment of the present invention switches the reception method based on the switching state of the input selector switch and, in the case of wired input, stops signal processing of the signal received from the antenna. Plan

  FIG. 1 is a block diagram showing a configuration of diversity receiving apparatus 100 in the first embodiment. The diversity receiving apparatus of this embodiment is capable of receiving, for example, terrestrial digital broadcasting, and is used as a means for receiving broadcast waves transmitted from broadcasting stations or the like on the first antenna 110, the second antenna 190, and the rooftop. A wired input terminal 120 for inputting a signal received by an external antenna installed in a wired manner; The input selector switch 130 is an RF (Radio Frequency) switch that exclusively switches signals received from the first antenna 110 and the wired input terminal 120, and the input selector switch control unit 140 performs switching control of the input selector switch 130. .

  In the channel selection units 150 and 200, a desired physical channel is selected from a radio frequency (RF) signal received by the first antenna 110 or the wired input terminal 120 and the second antenna 190, respectively. Thereafter, the demodulation units 160 and 210 perform frequency conversion to a baseband signal and AD conversion from an analog signal to a digital signal.

  The channel selection unit 150 and the demodulation unit 160 for processing signals received from the first antenna 110 or the wired input terminal 120 are combined to select the signals received from the first reception processing unit 170 and the second antenna 190. The local unit 200 and the demodulation unit 210 are collectively referred to as a second reception processing unit 220.

  Diversity combining processing such as maximum ratio combining is performed on the signals output from the first reception processing unit 170 and the second reception processing unit 220 by the diversity combining unit 230, and signal degradation due to the effects of multipath and fading is performed. To improve. The signal processing unit 240 performs signal processing such as decoding processing of the diversity combining unit output signal, video signal size adjustment, image quality adjustment, and analog signal conversion of the audio signal, and the video display unit 250 displays the video and the audio output unit 260 Voice output.

  The reception processing control unit 180 controls the operation of the second reception processing unit 220 based on the switching state of the input selector switch 130 detected from the input selector switch control unit 140. That is, when the input changeover switch 130 exclusively passes the reception signal of the wired input terminal 120, the signal processing of the second reception processing unit 220 is stopped and unnecessary in the second reception processing unit 220. Reduce power consumption. On the other hand, when the input selector switch 130 passes the first antenna 110 reception signal exclusively, the second reception processing unit 220 performs signal processing in the same manner as the first reception processing unit 170. Details of the power saving operation will be described later.

  The operation of the diversity receiving apparatus 100 of the present invention configured as described above will be described with reference to FIG.

  The input selector switch controller 140 performs switching control of the input selector switch 130 that exclusively switches the passage of the first antenna 110 reception signal and the wired input terminal 120 reception signal. Then, the reception processing control unit 180 detects the switching state of the input selector switch control unit 140 (step S10).

  When the detection result is not the reception of the wired input terminal 120 (when the reception signal of the first antenna 110 is exclusively passed), the reception signal of the first antenna 110 is the first reception processing unit 170, the second antenna. The received signal 190 is demodulated in both the second reception processing units 220 (step S11).

  Then, diversity combining processing such as maximum ratio combining is performed in diversity combining section 230 using the first reception processing section 170 output signal and second reception processing section 220 output signal (step S12). By this diversity combining process, it is possible to obtain a good combined signal that maximizes the portion with excellent reception characteristics and suppresses the influence of multipath and fading.

  The signal output from the diversity combining unit 230 is subjected to signal processing such as decoding processing, video signal size adjustment, image quality adjustment, and audio signal analog signal conversion in the signal processing unit 240, and an LCD (Liquid Crystal Display) panel or the like. The video display unit 250 performs video display and the audio output unit 260 such as a speaker performs audio output (step S13).

  On the other hand, the switching state of the input selector switch control unit 140 is detected (step S10), and in the case of reception of the wired input terminal 120, the signal processing of the second reception processing unit 220 is stopped by the reception processing control unit 180 (step S10). S14).

  Then, the signal received by the wired input terminal 120 is demodulated by the first reception processing unit 170 and output to the diversity combining unit 230. On the other hand, the signal received by the second antenna 190 is stopped in the second reception processing unit 220, and the signal output to the diversity combining unit 230 is not performed (step S15). Thereby, unnecessary power consumption in the second reception processing unit 220 can be suppressed.

  Diversity combining section 230 performs diversity combining processing of the first reception processing section 170 output signal and the second reception processing section 220 output signal (no signal). The maximum ratio combining process is a method in which the amplitude of each branch is weighted so that the SNR (signal-to-noise ratio) after combining is the best, and a no signal, that is, a signal with zero amplitude is theoretically combined. Will not contribute.

  Then, the signal output from the diversity combining unit 230 is subjected to signal processing by the signal processing unit 240, video display by the video display unit 250, and audio output by the audio output unit 260 (step S13).

  As described above, according to the first embodiment of the present invention, when the diversity receiving apparatus receives the wired input terminal 120, the switching state of the input changeover switch 130 is changed, and the reception processing control unit 180 sets the input changeover switch control unit 140. The reception processing control unit 180 stops the signal processing of the second reception processing unit 220.

  Since the power saving operation is performed by detecting only the switching state of the input changeover switch 130 in this way, reception is performed in comparison with the conventional technology that detects the reception quality such as CNR (carrier-to-noise ratio) and performs the power saving operation. Even when the quality is in the vicinity of the switching threshold, it is possible to reliably save power when the wired input terminal 120 is received.

  Furthermore, by combining the first antenna 110 and the reception processing unit for signals received at the wired input terminal 120, the number of reception processing units necessary for the device can be reduced, and the device can be simplified. Can do.

(Embodiment 2)
The diversity receiver according to the second embodiment of the present invention switches the reception method based on the switching state of the input switch, stops signal processing of the signal received from the antenna in the case of wired input, and combines diversity Further power saving will be achieved by stopping the processing.

  FIG. 3 is a block diagram showing a configuration of diversity receiving apparatus 300 in the second embodiment. In addition, about the thing which has the structure similar to Embodiment 1, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  In FIG. 3, a configuration different from that of the first embodiment will be described. The diversity combining control unit 310 controls the operation of the diversity combining unit 230 in addition to the second reception processing unit 220 based on the switching state of the input changeover switch 130 detected from the input changeover switch control unit 140. That is, when the input changeover switch 130 exclusively passes the reception signal of the wired input terminal 120, the signal processing in the second reception processing unit 220 is stopped and the diversity combining processing in the diversity combining unit 230 is also performed. The output signal of the first reception processing unit 170 is passed through and input to the signal processing unit 240. Thereby, unnecessary power consumption in the diversity combining unit 230 is suppressed. On the other hand, when the input changeover switch 130 passes the first antenna 110 reception signal exclusively, the second reception processing unit 220 performs signal processing and the diversity combining unit 230 also performs combining processing. Details of the power saving operation will be described later.

  The operation of the diversity receiving apparatus 300 of the present invention configured as described above will be described with reference to FIG.

  The input selector switch controller 140 performs switching control of the input selector switch 130 that exclusively switches the passage of the first antenna 110 reception signal and the wired input terminal 120 reception signal. Then, the reception processing control unit 180 detects the switching state of the input selector switch control unit 140 (step S20).

  When the detection result is not the reception of the wired input terminal 120 (when the reception signal of the first antenna 110 is exclusively passed), the reception signal of the first antenna 110 is the first reception processing unit 170, the second antenna. The received signal 190 is demodulated by both the second reception processing unit 220 (step S21).

  Then, diversity combining processing such as maximum ratio combining is performed in diversity combining section 230 using the first reception processing section 170 output signal and second reception processing section 220 output signal (step S22). By this diversity combining process, it is possible to obtain a good combined signal that maximizes the portion with excellent reception characteristics and suppresses the influence of multipath and fading.

  The signal output from the diversity combining unit 230 is subjected to signal processing such as decoding processing, video signal size adjustment, image quality adjustment, and audio signal analog signal conversion in the signal processing unit 240, and a video display unit 250 such as an LCD panel. In step S23, an audio output is performed by the audio output unit 260 such as a video display or a speaker.

  On the other hand, the switching state of the input changeover switch control unit 140 is detected (step S20). When the wired input terminal 120 is received, the signal processing of the second reception processing unit 220 is stopped by the reception processing control unit 180 (step S20). S24).

  Then, the signal received by the wired input terminal 120 is demodulated by the first reception processing unit 170 and output to the diversity combining unit 230. On the other hand, the signal received by the second antenna 190 is stopped in the second reception processing unit 220, and the signal output to the diversity combining unit 230 is not performed (step S25). Thereby, unnecessary power consumption in the second reception processing unit 220 can be suppressed.

  Then, the diversity combining unit 230 detects that the wired input terminal 120 is received from the input changeover switch control unit 140, stops the diversity combining process, passes through the output signal of the first reception processing unit 170, and passes through the signal processing unit 240. Output to. Then, the signal that has passed through the diversity combining unit 230 is subjected to signal processing by the signal processing unit 240, video display by the video display unit 250, and audio output by the audio output unit 260 (step S23). Thereby, in addition to the second reception processing unit 220, the diversity combining unit 230 can suppress unnecessary power consumption.

  As described above, according to the first embodiment of the present invention, the diversity receiving device changes the switching state of the input changeover switch 130 via the input changeover switch control unit 140 when receiving the wired input terminal 120. 180, the reception processing control unit 180 stops the signal processing of the second reception processing unit 220, and the diversity combining control unit 310 stops the combining processing of the diversity combining unit 230.

  In addition to the first embodiment in which only the signal processing of the second reception processing unit 220 is stopped, the combination processing of the diversity combining unit 230 is also stopped, so that further power saving can be realized.

  In addition, when the wired input terminal 120 is received, the diversity combining process is stopped, and the output signal of the first reception processing unit 170 is passed through the diversity combining unit 230 and used by the signal processing unit 240. The signal processing unit 240 can be prevented from deteriorating without being affected by unnecessary diversity combining with noise jumping into the signal (no signal).

(Embodiment 3)
The diversity receiver according to the third embodiment of the present invention switches the reception method based on the switching state of the input selector switch, and stops the power supply to the signal processing unit of the signal received from the antenna in the case of wired input To achieve further power saving.

  FIG. 5 is a block diagram showing a configuration of diversity receiving apparatus 400 in the third embodiment. In addition, about the thing which has the structure similar to Embodiment 1, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  A configuration different from that of the first embodiment will be described with reference to FIG. The power controller 410 controls power supply to the second reception processor 220 based on the switching state of the input selector switch 130 detected from the input selector switch controller 140. That is, when the input changeover switch 130 allows the reception signal of the wired input terminal 120 to pass exclusively, the power supply to the second reception processing unit 220 is stopped and unnecessary in the second reception processing unit 220. To reduce power consumption. On the other hand, when the input change-over switch 130 passes the first antenna 110 reception signal exclusively, power is supplied to the second reception processing unit 220. Details of the power saving operation will be described later.

  The operation of the diversity receiving apparatus 400 of the present invention configured as described above will be described with reference to FIG.

  The input selector switch controller 140 performs switching control of the input selector switch 130 that exclusively switches the passage of the first antenna 110 reception signal and the wired input terminal 120 reception signal.

  Then, the reception processing control unit 180 detects the switching state of the input selector switch control unit 140 (step S30).

  When the detection result is not the reception of the wired input terminal 120 (when the reception signal of the first antenna 110 is exclusively passed), the reception signal of the first antenna 110 is the first reception processing unit 170, the second antenna. The 190 received signal is demodulated in both the second reception processing units 220 (step S31).

  Then, diversity combining processing such as maximum ratio combining is performed in diversity combining section 230 using the first reception processing section 170 output signal and second reception processing section 220 output signal (step S32). By this diversity combining process, it is possible to obtain a good combined signal that maximizes the portion with excellent reception characteristics and suppresses the influence of multipath and fading.

  The signal output from the diversity combining unit 230 is subjected to signal processing such as decoding processing, video signal size adjustment, image quality adjustment, and audio signal analog signal conversion in the signal processing unit 240, and a video display unit 250 such as an LCD panel. In step S33, a sound is output by the sound output unit 260 such as a video display and a speaker.

  On the other hand, the switching state of the input changeover switch control unit 140 is detected (step S30), and when the wired input terminal 120 is received, the power supply control unit 410 stops the power supply to the second reception processing unit 220 (step S30). S34).

  Then, the signal received by the wired input terminal 120 is demodulated by the first reception processing unit 170 and output to the diversity combining unit 230. On the other hand, the signal received by the second antenna 190 is no longer processed by the second reception processing unit 220, and no signal is output to the diversity combining unit (step S35). Thereby, unnecessary power consumption in the second reception processing unit 220 can be suppressed.

  Diversity combining section 230 performs diversity combining processing of the first reception processing section 170 output signal and the second reception processing section 220 output signal (no signal). The maximum ratio combining process is a method in which the amplitude of each branch is weighted so that the SNR (signal-to-noise ratio) after combining is the best, and a no signal, that is, a signal with zero amplitude is theoretically combined. Will not contribute.

  As in the case of the first antenna 110 reception, the signal output from the diversity combining unit 230 is subjected to signal processing by the signal processing unit 240, video display by the video display unit 250, and audio output by the audio output unit 260. Audio output is performed (step S33).

  As described above, according to the third embodiment of the present invention, the diversity receiving apparatus determines the switching state of the input selector switch 130 when the wired input terminal 120 is received, and the power controller 410 determines the input selector switch controller 140. And the power supply control unit 410 stops the power supply to the second reception processing unit 220, and the signal processing in the second reception processing unit 220 is stopped.

  By stopping the power supply itself to the second reception processing unit 220, further power saving can be realized as compared with the first embodiment in which only the signal processing is stopped.

  In the third embodiment of the present invention, as in the second embodiment, the diversity combining control unit detects the switching state of the input switch 130 via the input switch control unit 140 when the wired input terminal 120 is received. The diversity combining control unit may stop the combining process of the diversity combining unit 230.

In this case, in addition to stopping the power supply to the second reception processing unit 220, the combining process of the diversity combining unit 230 is also stopped, so that further power saving can be realized.
In addition, when the wired input terminal 120 is received, the diversity combining process is stopped, and the output signal of the first reception processing unit 170 is passed through the diversity combining unit 230 and used by the signal processing unit 240. The signal processing unit 240 can be prevented from deteriorating without being affected by unnecessary diversity combining with noise jumping into the signal (no signal).

(Other embodiments)
As described above, Embodiments 1 to 3 have been described as examples of the present invention. However, the present invention is not limited to these. Therefore, another embodiment of the present invention will be described below.
In the first to third embodiments, the method of saving power in the diversity receiver that receives television broadcast waves such as terrestrial digital broadcasting has been described. However, the present invention is not limited to this. For example, with respect to an apparatus that receives other high-frequency signals such as a wireless LAN signal, it is possible to save power by using the same method as in the first to third embodiments of the present invention.

  In the first to third embodiments, the case where the first antenna 110 and the second antenna 190 have two antennas as radio wave receiving means for broadcasting waves transmitted from a broadcasting station or the like has been described. However, the present invention is not limited to this, and power saving can be realized for a diversity receiver having three or more antennas by using the same method as in Embodiments 1 to 3 of the present invention. .

  In the diversity receiver having three or more antennas, it is possible to stop the signal processing and diversity combining processing of two or more reception processing units in the case of reception of the wired input terminal 120, so that further power saving can be achieved. Can be realized.

  According to the present invention, power saving can be realized in a diversity receiver having an antenna that is a wireless receiver and a wired input terminal, which is useful in portable receivers and the like.

100, 300, 400 Diversity receiver 110 First antenna 120 Wired input terminal 130 Input changeover switch 140 Input changeover switch control unit 150, 200 Channel selection unit 160, 210 Demodulation unit 170 First reception processing unit 180 Reception processing control unit 190 Second antenna 220 Second reception processing unit 230 Diversity combining unit 240 Signal processing unit 250 Video display unit 260 Audio output unit 310 Diversity combining control unit 410 Power supply control unit

Claims (8)

A first antenna for receiving a radio signal, and a second antenna;
A first reception processing unit and a second reception processing unit for demodulating radio waves received by the first and second antennas, respectively;
A wired input terminal for inputting a signal from the outside to the first reception processing unit in a wired manner;
An input changeover switch for exclusively switching an input signal of the wired input terminal and an input signal of the first antenna;
A reception processing control unit that controls the operation of the second reception processing unit and stops signal processing of the second reception processing unit when the input changeover switch is a wired input;
When the input selector switch is an input from the first antenna, diversity combining is performed on the input signals from the first reception processing unit and the second reception processing unit operated by the reception processing control unit. Diversity synthesis unit to
A diversity receiver characterized by comprising: A diversity combining control unit that further stops the combining processing of the diversity combining unit when the input selector switch is a wired input;
The diversity receiver according to claim 1, further comprising: Three or more antennas for receiving radio signals,
Three or more reception processing units that respectively demodulate radio waves received by the three or more antennas;
The diversity receiving apparatus according to claim 1, further comprising a wired input terminal that inputs a signal from outside to the one of the three or more reception processing units by wire. A first antenna for receiving a radio signal, and a second antenna;
A first reception processing unit and a second reception processing unit for demodulating radio waves received by the first and second antennas, respectively;
A wired input terminal for inputting a signal from the outside to the first reception processing unit in a wired manner;
A power control unit that controls power supply to the second reception processing unit and stops power supply to the second reception processing unit when the input selector switch is a wired input;
When the input selector switch is an input from the first antenna, diversity combining is performed on input signals from the first reception processing unit and the second reception processing unit supplied with power by the power control unit. Diversity synthesis unit to
A diversity receiver characterized by comprising: A diversity combining control unit that further stops the combining processing of the diversity combining unit when the input selector switch is a wired input;
The diversity receiver according to claim 4, further comprising: Three or more antennas for receiving radio signals,
Three or more reception processing units that respectively demodulate radio waves received by the three or more antennas;
The diversity receiving apparatus according to claim 4 or 5, comprising: The first antenna for receiving a radio wave signal and the second antenna;
The first reception processing unit and the second reception processing unit for demodulating radio waves received by the first and second antennas, respectively;
The wired input terminal for inputting a signal from the outside in a wired manner to the first reception processing unit;
The input changeover switch for exclusively switching an input signal of the wired input terminal and an input signal of the first antenna;
The diversity combining section for diversity combining input signals from the first reception processing section and the second reception processing section;
In a reception method switching method between single reception and diversity reception in a diversity reception device comprising:
When the input changeover switch is a wired input, switch to single reception using only the input signal from the first reception processing unit,
When the input changeover switch is an input from the first antenna, it switches to diversity reception using both input signals from the first reception processing unit and the second reception processing unit. Receiving method switching method. The three or more antennas for receiving radio signals;
The three or more reception processing units that respectively demodulate radio waves received by the three or more antennas;
The reception method switching method according to claim 7, further comprising: the wired input terminal that inputs a signal from the outside to the one of the three or more reception processing units by wire.

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