JP2012015806A - Modulation signal processing device and modulation signal processing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a modulation signal processing device capable of excellently dealing with overmodulation signals.SOLUTION: The modulation signal processing device according to an embodiment includes setting means, storage means, channel selection means, and signal processing means. The setting means sets one signal processing mode selected from a plurality of signal processing modes for respective channels. The storage means stores the signal processing modes set for each of the channels. The channel selection means selects a channel. The signal processing means performs processing of the modulation signal of the selected channel, on the basis of the signal processing mode set for the channel selected by the channel selection means.

Description

  Embodiments described herein relate generally to a modulation signal processing apparatus and a modulation signal processing method for processing a modulation signal.

  Audio signals such as television broadcasts from each broadcasting station are modulated with a prescribed modulation degree. Therefore, the television broadcast receiving apparatus can appropriately process and output the specified modulated audio signal from each broadcast station by the audio processing corresponding to the specified modulation degree.

  However, in some countries or regions, an overmodulated audio signal whose modulation amplitude is wider than the specified modulation amplitude may be broadcast. That is, there may be a mixture of broadcast stations that broadcast the prescribed modulated audio signal and broadcast stations that broadcast the overmodulated audio signal.

  When a television broadcast receiver as described above receives an overmodulated audio signal, the overmodulated audio signal cannot be appropriately processed and output, and the output audio may be distorted.

  Therefore, a technique has been proposed in which the gain of the received audio signal is adjusted, the adjusted gain is stored, and the overmodulated audio signal is supported.

JP 2008-205762 A

  However, when the gain is adjusted according to the reception of the audio signal, a slightly different gain may be set every time. For example, although the overmodulation degree of the overmodulation signal is constant, a slightly different gain may be set every time, and the audio output may become unstable. As described above, there is a problem that the response to the overmodulation signal is insufficient.

  An object of the present invention is to provide a modulation signal processing apparatus and a modulation signal processing method which are excellent in dealing with overmodulation signals.

  The modulation signal processing apparatus according to the embodiment includes a setting unit, a storage unit, a channel selection unit, and a signal processing unit. The setting means sets one signal processing mode selected from a plurality of signal processing modes for each channel. The storage means stores a signal processing mode set for each channel. The channel selection means selects a channel. The signal processing means processes the modulated signal of the selected channel based on the signal processing mode set for the selected channel selected by the channel selecting means.

It is a figure which shows an example of schematic structure of the broadcast receiving apparatus common in 1st and 2nd embodiment. It is a flow chart for explaining an example of proper use of the first modulated audio signal processing mode (Mono1) and the second modulated audio signal processing mode (Mono2). It is a figure which shows an example of a process of the modulation | alteration audio | voice signal and an overmodulation audio | voice signal by the 1st modulation | alteration audio | voice signal processing mode (Mono1) and the 2nd modulation | alteration audio | voice signal processing mode (Mono2). It is a figure which shows an example of a signal processing mode setting screen.

  The first and second embodiments will be described below with reference to the drawings.

  FIG. 1 is a diagram illustrating an example of a schematic configuration of a broadcast receiving apparatus common to the first and second embodiments. In the first and second embodiments, an example of modulated audio signal processing by a broadcast receiving apparatus including one or more tuners will be described. However, the present invention is not limited to the modulated audio signal processing by such a broadcast receiving apparatus. For example, the modulated audio signal processing described below can be realized by a program recording apparatus such as an HDD recorder equipped with one or more tuners, a BD (Blu-ray) (registered trademark) recorder, and a DVD recorder. It is also possible to realize the modulated audio signal processing described below by a set top box composed of one or more tuners. Note that the broadcast receiving device, the program recording device, and the set-top box all receive broadcast signals such as cable television broadcast, satellite broadcast, terrestrial broadcast, and IP broadcast, and are included in the received broadcast signal. The video signal is converted into a signal that can be viewed on a display device and output, and the modulated audio signal included in the received broadcast signal is converted into a signal that can be output by a speaker and output.

  As shown in FIG. 1, the broadcast receiving apparatus includes a tuner 102, a signal processing module 103, a video processing module 104, a display processing module 105, a video display unit 106, an audio processing module 107, a speaker 108, a control module 110, and a memory unit 111. ROM 112, input unit 113, remote controller 114, light receiving unit 115, USB connector 116, card connector 117, and the like.

  The tuner 102 is a digital broadcast receiving tuner, for example, and functions as channel selection means. The broadcast receiving apparatus shown in FIG. 1 is composed of one tuner 102, but may be composed of a plurality of tuners.

  For example, the remote controller 114 includes a plurality of channel keys, mode setting keys, menu keys, direction keys, determination keys, and the like. The input unit 113 also includes similar keys. The remote controller 114 and the input unit 113 function as signal processing mode selection means. For example, the user can specify a desired channel via the channel key of the remote controller 114.

  The tuner 102 receives digital broadcast signals such as BS, CS, and terrestrial waves received by the antenna 101, and selects and outputs a broadcast signal of a desired channel designated by the user via the remote controller 114 or the like.

  The signal processing module 103 outputs the video signal included in the broadcast signal to the video processing module 104, and outputs the audio signal included in the broadcast signal to the audio processing module 107.

  The video processing module 104 processes the video signal according to the screen size of the video display unit 106. The display processing module 105 synthesizes the video signal and graphics such as character information and outputs a synthesized video signal. The display unit 106 displays a video based on the composite video signal.

  The audio processing module 107 applies acoustic processing such as amplification to the audio signal. The speaker 108 outputs sound based on the sound signal processed by the sound processing module 107.

  The control module 110 is composed of, for example, a microcomputer, and video / audio such as the tuner 102, the signal processing module 103, the video processing module 104, the display processing module 105, and the audio processing module 107 via a communication line such as IIC-BUS. Connected to the processing module. Thereby, the control module 110 can control the video / audio processing module via a communication line such as IIC-BUS.

  Further, the control module 110 is connected to the memory unit 111, the ROM 112, the input unit 113, and the light receiving unit 115. The control module 110 reads data such as an operation program from the ROM 112, writes various data to a volatile memory (RAM) and a nonvolatile memory (NVRAM) included in the memory unit 111, and configures the memory unit 111. Various data are read from the volatile memory and the nonvolatile memory.

  Further, the control module 110 is connected to the input unit 113 and the light receiving unit 115. As a result, the control module 110 receives various instructions via the input unit 113 and receives various instructions from the remote controller 114 via the light receiving unit 115.

  Further, the control module 110 is connected to the USB connector 116 and the card connector 117. Thereby, the control module 110 can transmit data to the USB device 118 connected to the USB connector 116 via the USB connector 116, and can receive data from the USB device 118. Similarly, the control module 110 can transmit data to the media card 119 connected to the card connector 117 via the card connector 117 and receive data from the media card 119.

  Next, the modulated audio signal processing by the broadcast receiving apparatus described above will be described.

(First embodiment)
Depending on the country or region, the modulated audio signal (first modulated audio signal) modulated with a specified modulation factor (first modulation factor) and a modulation factor different from the specified modulation factor (second modulation factor) are modulated. An overmodulated audio signal (second modulated audio signal) may be broadcast.

  The control module 110 of the broadcast receiving apparatus selects one modulated audio signal processing mode (one signal processing mode) selected from a plurality of modulated audio signal processing modes (a plurality of signal processing modes) for each channel. The modulated audio signal processing mode (signal processing mode) set for each channel can be stored. For example, the memory unit 111 stores a plurality of modulated audio signal processing modes, and further stores a modulated audio signal processing mode set for each channel.

  Thereby, the audio processing module 107 of the broadcast receiving apparatus refers to the modulated audio signal processing mode of each channel stored in the memory unit 111, and sets the modulated audio signal processing mode (signal processing) set for the selected channel. Mode), the modulated audio signal (modulated signal) of the selected channel can be processed.

  For example, when the user instructs selection of the first channel via the first channel key of the remote controller 114, the tuner 102 responds to the first broadcast of the first channel from the received broadcast signal. The video processing module 104 processes and outputs the video signal included in the first broadcast signal, and the audio processing module 107 selects the first or second signal set for the first channel. Based on the second modulated audio signal processing mode, the audio signal included in the first broadcast signal is processed and output. That is, the video display unit 106 displays video based on the video signal included in the first broadcast signal, and the speaker 108 outputs audio based on the audio signal included in the first broadcast signal.

  The first modulated audio signal processing mode is a mode for processing the first modulated audio signal modulated with the first modulation degree. For example, the first modulated audio signal processing mode is a mode for processing a modulated audio signal without correcting the modulated audio signal. The second modulated audio signal processing mode is a mode for processing the second modulated audio signal modulated with the second modulation factor. For example, the second modulated audio signal processing mode is a mode for correcting the modulated audio signal and processing the modulated audio signal.

  As described above, with the first channel selected (when the first broadcast signal of the first channel is output), the user can select the first channel via the mode setting key of the remote controller 114. The first or second modulated audio signal processing mode set for each channel can be changed.

  For example, when the mode setting key of the remote controller 114 is pressed in a state where the first channel is selected and the first modulated audio signal processing mode is set for the first channel, the control module 110 sets the second modulated audio signal processing mode for the first channel, and the memory unit 111 stores the second modulated audio signal processing mode set for the first channel.

  Further, when the mode setting key of the remote controller 114 is pressed in a state where the first channel is selected and the second modulated audio signal processing mode is set for the first channel, the control module 110 sets the first modulated audio signal processing mode for the first channel, and the memory unit 111 stores the first modulated audio signal processing mode set for the first channel.

  For example, when the modulated audio signal of the first channel is the first modulated audio signal modulated with the first modulation factor, the first modulated audio signal processing mode is set for the first channel. For example, the modulated audio signal of the first channel is appropriately processed, and good audio with less distortion is output from the speaker 108.

  Conversely, when the modulated audio signal of the first channel is the second modulated audio signal modulated with the second modulation factor, the first modulated audio signal processing mode is set for the first channel. For example, the modulated audio signal of the first channel is not appropriately processed, and distorted audio is output from the speaker 108.

  In this case, the user sets the second modulated audio signal processing mode for the first channel via the mode setting key of the remote controller 114. As a result, the modulated audio signal of the first channel is appropriately processed, and good audio with less distortion is output from the speaker 108.

  Similarly to the above, the first or second modulated audio signal processing mode can be set for the second and third channels. That is, the first or second modulated audio signal processing mode can be set for each channel. Therefore, whether the modulated audio signal of each channel is the first modulated audio signal or the second modulated audio signal, the first or second modulated audio signal processing mode is set for each channel. By setting, it is possible to output good sound with less distortion from the speaker 108.

  For example, in the initial state, the control module 110 can set the second modulated audio signal processing mode for each channel. That is, in the initial state, the memory unit 111 stores the second modulated audio signal processing mode set for each channel.

  For example, in a country or region where the number of broadcasting stations broadcasting a program using the second modulated audio signal is larger than the number of broadcasting stations broadcasting the program using the first modulated audio signal, It is more convenient to use the second modulated audio signal processing mode for the channel.

  FIG. 2 is a flowchart for explaining an example of proper use of the first modulated audio signal processing mode (Mono1) and the second modulated audio signal processing mode (Mono2).

  For example, when channel N is selected and the last mode (memory) set for channel N is Mono1 (ST1, YES), control module 110 sets Mono1 (ST2). Therefore, the audio processing module 107 processes the modulated audio signal of the selected channel N based on Mono1.

  If Mono1 is selected in a state where channel N is selected (in a state where a broadcast signal of channel N is output) (ST3) (ST4, YES), control module 110 causes Mono1 to be the last memory again. Control (ST5), the memory unit 111 stores the Mono1 as the last memory again. Accordingly, the audio processing module 107 continues to process the modulated audio signal of the selected channel N based on Mono1.

  If Mono2 is selected in a state where channel N is selected (in a state where a broadcast signal of channel N is output) (ST3) (ST4, NO), the control module 11 performs control so that Mono2 is stored in the last memory. Then (ST9), the memory unit 111 last-stores Mono1. Thereby, the audio processing module 107 processes the modulated audio signal of the selected channel N based on Mono2.

  After that, when channel N is selected, since the last mode (memory) set for channel N is Mono2 (ST1, NO), control module 110 sets Mono2 (ST6). Therefore, the audio processing module 107 processes the modulated audio signal of the selected channel N based on Mono2.

  If Mono2 is selected in a state where channel N is selected (in a state where a broadcast signal of channel N is output) (ST7) (ST8, YES), the control module 110 causes the Mono2 to be the last memory again. Control (ST9), the memory unit 111 last memory of Mono2 again. Thereby, the audio processing module 107 continues to process the modulated audio signal of the selected channel N based on Mono2.

  If Mono1 is selected in a state where channel N is selected (in a state where a broadcast signal of channel N is output) (ST7) (ST8, NO), the control module 110 performs control so that Mono1 is stored in the last memory. Then (ST5), the memory unit 111 last-stores Mono1. Thereby, the audio processing module 107 processes the modulated audio signal of the selected channel N based on Mono1.

  When the audio processing module 107 processes an overmodulated audio signal using Mono1, a partially interrupted audio or noise may be output from the speaker 108. Mono2 is an audio signal processing mode suitable for processing an overmodulated audio signal. Therefore, when the audio signal processing module 107 processes an overmodulated audio signal with Mono2, audio with relatively good sound quality is output from the speaker 108.

  Here, with reference to FIG. 3, a supplementary description will be given of the processing of the modulated audio signal and the overmodulated audio signal in the first modulated audio signal processing mode (Mono1) and the second modulated audio signal processing mode (Mono2). FIG. 3 is a diagram illustrating an example of processing of the modulated audio signal and the overmodulated audio signal in the first modulated audio signal processing mode (Mono1) and the second modulated audio signal processing mode (Mono2).

  When trying to process the overmodulated audio signal S2 with Mono1, the signal components S21 and S22 of the overmodulated audio signal S2 are not processed. Therefore, Mono1 cannot properly process the overmodulated audio signal S2.

  If the modulated audio signal S1 is to be processed by Mono2, the signal components S11 and S12 (noise components) of the modulated audio signal S1 are included in the processing target, and distortion occurs in the audio output. Therefore, Mono2 cannot properly process the modulated audio signal S1.

  That is, by processing the modulated audio signal S1 with Mono1, the modulated audio signal S1 can be appropriately processed, and sound with good sound quality can be output. Further, by processing the overmodulated audio signal S2 with Mono2, the overmodulated audio signal S2 can be appropriately processed, and sound with good sound quality can be output.

  The broadcast receiving apparatus described above can set and store Mono1 or Mono2 for each channel. Therefore, the broadcast receiving apparatus can process the modulated audio signal of the switched channel by Mono1 or Mono2 set to the switched channel according to the channel switching by the user. That is, the user does not need to set Mono1 or Mono2 every time the channel is switched, which is excellent in convenience.

  Moreover, assuming that the modulation degree of the overmodulated audio signal is known in advance, it is possible to set Mono2 suitable for processing of the overmodulated audio signal with the modulation degree already known. For example, each time a signal is received, the overmodulated audio signal included in the received signal is analyzed, and when the audio processing mode adjusted according to the analysis result of the overmodulated audio signal is set, the change in the received signal and the signal It is conceivable that the set voice processing mode changes due to an analysis error or the like. That is, although the degree of modulation of the overmodulated audio signal is constant, the audio output result also changes when the audio processing mode for processing the overmodulated audio signal changes.

  On the other hand, since the broadcast receiving apparatus can process the overmodulated audio signal with Mono2 suitable for processing the overmodulated audio signal having the modulation degree that has been known in advance, the broadcast receiving apparatus stably processes the overmodulated audio signal. can do. That is, a stable and good audio output result can be obtained.

  In the above description, the case where the broadcast receiving apparatus sets and stores one of the two modulated audio signal processing modes (Mono1 / Mono2) for each channel has been described. Can set and store any of three or more modulated audio signal processing modes.

  That is, it has been found that there is a first modulated audio signal having the first modulation factor, a second modulated audio signal having the second modulation factor, and a third modulated audio signal having the third modulation factor. The broadcast receiving apparatus has a first modulated audio signal processing mode capable of appropriately processing the first modulated audio signal, and a second capable of appropriately processing the second modulated audio signal. A modulated audio signal processing mode and a third modulated audio signal processing mode capable of appropriately processing the third modulated audio signal are stored, and the first, second, and third modes are stored for each channel. Any mode of the modulated audio signal processing mode can be set and stored.

  In the above description, the merit of setting the second modulated audio signal processing mode for each channel in the initial state has been described. As described above, when the second modulated audio signal processing mode is set for each channel in the initial state, for example, after that, the user can set each channel via the mode setting key of the remote controller 114. On the other hand, the second modulated audio signal processing mode initially set can be changed to the first modulated audio signal processing mode.

  Alternatively, the audio processing module 107 can analyze the modulated audio signal, and the control module 110 can set the first or second modulated audio signal processing mode based on the signal analysis result. For example, when the channel N is selected and the control module 110 determines that the modulated audio signal of the channel N corresponds to the first modulated audio signal based on the analysis result of the modulated audio signal of the channel N, 1 modulation audio signal processing mode is set. When the control module 110 determines that the modulated audio signal of channel N corresponds to the second modulated audio signal, the control module 110 sets the second modulated audio signal processing mode for channel N. Thus, even if the user does not set the first or second modulated audio signal processing mode for each channel, the first or second modulated audio signal processing is automatically performed for each channel. The mode can be set.

(Second Embodiment)
In the first embodiment, the first mode setting for setting the first modulated audio signal processing mode (Mono1) or the second modulated audio signal processing mode (Mono2) for the selected channel at the time of channel selection will be described. did. In the second embodiment, the first modulated audio signal processing mode (Mono1) or the second modulated audio signal processing mode (Mono2) is set for each channel via the signal processing mode setting screen as shown in FIG. The second mode setting for setting) will be described.

  For example, the user can instruct the display of the signal processing mode setting screen via the menu key of the remote controller 114. The control module 110 of the broadcast receiving apparatus controls the display of the signal processing mode setting screen in response to the display instruction of the signal processing mode setting screen. Thereby, the video display unit 106 displays a signal processing mode setting screen as shown in FIG.

  When the user instructs setting of Mono1 for the channel 101 on the signal processing mode setting screen via the direction key and the enter key of the remote controller 114, the control module 110 sets Mono1 for the channel 101. The memory unit 111 stores Mono1 for the channel 101.

  Alternatively, when the user instructs the setting of Mono2 for the channel 101 on the signal processing mode setting screen via the direction key and the decision key of the remote controller 114, the control module 110 sets Mono2 for the channel 101. The memory unit 111 stores Mono1 for the channel 102.

  Similarly, Mono1 or Mono2 can be set for the channels 102, 103, and the like, and the memory unit 111 stores Mono1 or Mono2 for the channels 102, 103, and the like.

  The contents set by the first mode setting described in the first embodiment can also be confirmed on the signal processing mode setting screen shown in FIG. That is, when the user instructs display of the signal processing mode setting screen via the menu key of the remote controller 114, the video display unit 106 displays the signal processing mode setting screen (current signal processing mode of the current signal processing mode) as shown in FIG. Display the setting status.

  According to the first and second embodiments described above, it is possible to provide a modulation signal processing apparatus and a modulation signal processing method that are excellent in dealing with overmodulated signals.

  The module described above may be realized by hardware, or may be realized by software using a CPU or the like.

  Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

  DESCRIPTION OF SYMBOLS 102 ... Tuner, 103 ... Signal processing module, 104 ... Video processing module, 105 ... Display processing module, 106 ... Video display unit, 107 ... Audio processing module, 108 ... Speaker, 110 ... Control module, 111 ... Memory unit, 112 ... ROM 113 ... Input unit 114 ... Remote controller 115 ... Light receiving unit

Claims (9)

Setting means for setting one signal processing mode selected from a plurality of signal processing modes for each channel;
Storage means for storing the signal processing mode set for each channel;
Channel selection means for selecting a channel;
Signal processing means for processing the modulation signal of the selected channel based on the signal processing mode set for the selected channel selected by the channel selecting means;
A modulation signal processing apparatus comprising: The setting means sets one modulated audio signal processing mode selected from a plurality of modulated audio signal processing modes for each channel,
The storage means stores a modulated audio signal processing mode set for each channel;
The modulated signal processing apparatus according to claim 1, wherein the signal processing means processes the modulated audio signal of the selected channel based on a modulated audio signal processing mode set for the selected channel. The setting means, for each channel, a first modulated audio signal processing mode for processing a modulated audio signal of the first modulation degree or a second for processing a modulated audio signal of the second modulation degree. Set the modulated audio signal processing mode for
The storage means stores the first or second modulated audio signal processing mode set for each channel;
2. The modulation signal processing apparatus according to claim 1, wherein the signal processing unit processes the modulated audio signal of the selected channel based on the first or second modulated audio signal processing mode set for the selected channel. . The setting means is configured to process, for each channel, a first modulated audio signal processing mode for processing a modulated audio signal having a specified modulation degree or an overmodulated audio signal having a modulation degree different from the specified modulation degree. 2 modulation audio signal processing mode,
The storage means stores the first or second modulated audio signal processing mode set for each channel;
2. The modulation signal processing apparatus according to claim 1, wherein the signal processing unit processes the modulated audio signal of the selected channel based on the first or second modulated audio signal processing mode set for the selected channel. .   5. The modulated signal processing device according to claim 3, wherein the storage unit stores the second modulated audio signal processing mode set for each channel in an initial state. 6.   The modulation signal processing apparatus according to claim 1, further comprising signal processing mode selection means for selecting the one signal processing mode from the plurality of signal processing modes. Comprising output means for outputting display information for displaying a signal processing mode setting screen;
The modulation signal processing apparatus according to claim 6, wherein the setting unit sets the one signal processing mode selected by the selection unit for each channel via the signal processing mode setting screen.   The modulation signal processing apparatus according to claim 1, wherein the output unit outputs display information for displaying a signal processing mode set for each channel. For each channel, set one signal processing mode selected from multiple signal processing modes,
Stores the signal processing mode set for each channel,
Select a channel,
A modulation signal processing apparatus that processes a modulation signal of the selected channel based on a signal processing mode set for the selected selection channel.

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