JP2005236900A - Television receiver and signal processor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a television receiver which has no need of a high power amplifier and is usable for viewing without bothering people around a user even in a noisy environment. <P>SOLUTION: The television receiver 100 comprises a microcomputer 6, a comparator 5 connected to the microcomputer 6, a detector 3 connected to the comparator 5, a microphone 1 connected to the detector 3 through a microphone amplifier 2, and a memory 4 connected to the comparator 5 for storing a specified set value N1. When the output of the detector 3 is greater than a specified set value N1 in the memory 4, the microcomputer 6 turns on a changeover switch 13 to send out the output of a character information circuit 12 to a synthesizer 14. The synthesizer 14 combines picture signals output from a TV receiving demodulator circuit 8 with character information output from the character information circuit 12, and a display 15 displays a picture of picture signals of the demodulator circuit 8 and superimposed character information of the character information circuit 12 thereon. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a television receiver and a signal processing device, and more particularly to a television receiver and a signal processing device that are viewed in a noisy environment.

  A conventional television receiver such as a mobile TV or a portable television has a speaker that outputs sound at a predetermined output level, an amplifier that drives the speaker, a microphone that detects sound output from the speaker together with ambient noise, and a digital An adaptive filter comprising a signal processor (DSP) is provided.

The television receiver separates the sound from the speaker from the sound detected by the microphone, extracts only the ambient noise, and increases the output level of the speaker in proportion to the sound pressure level of the extracted noise. The sound from the speaker is heard by the user (for example, see Patent Document 1).
JP 05-259779 A

  However, in the above television receiver, there is a limit to increase the output level of the speaker so that the sound from the speaker can be sufficiently heard even in a noisy environment. One reason is that there is a limit to the ability of the amplifier that drives the speaker, and the other reason is that if a loud sound is output to the surroundings, the surrounding people will be inconvenienced.

  An object of the present invention is to provide a television receiver that can be viewed without disturbing the surrounding people even in a noisy environment and can eliminate the need for an amplifier with a large output.

  In order to achieve the above object, a television receiver according to claim 1 includes a receiving means for receiving a television broadcast, a noise collecting means for collecting ambient noise and outputting an ambient noise signal, and the receiving means. In accordance with the level of the ambient noise signal output from the noise collecting means, the generating means for generating the character information according to the received audio signal of the television broadcast, the display device for displaying the generated character information Control means for controlling the generated display device so as to display the character information.

  The television receiver according to claim 2 is the television receiver according to claim 1, wherein the control means generates the generation when the level of the ambient noise signal output from the noise collecting means is higher than a predetermined set value. The display device is controlled to display the generated character information and to delete the generated character information when the character information is lower than the predetermined set value.

  The television receiver according to claim 3 is the television receiver according to claim 1, wherein the display device is a first display device that displays the generated character information and the television received by the receiving means. A second display device for displaying a broadcast video signal, wherein the control means displays the generated character information according to the level of the ambient noise signal output from the noise collecting means. The first display device is controlled.

  The television receiver according to claim 4 is the television receiver according to claim 3, wherein the control means generates the generation when the level of the ambient noise signal output from the noise collecting means is higher than a predetermined set value. The first display device is controlled to display the written character information.

  The television receiver according to claim 5 is the television receiver according to any one of claims 1 to 4, further comprising an audio output device that outputs an audio signal of the television broadcast received by the receiving means as audio. The control means controls the audio output device so that the output level becomes a predetermined constant value regardless of the level of the ambient noise signal output from the noise collecting means.

  The television receiver according to claim 6 is the television receiver according to any one of claims 1 to 4, further comprising an audio output device that outputs an audio signal of the television broadcast received by the receiving means as audio. The control means controls the audio output device so that the output level increases or decreases according to the level of the ambient noise signal output from the noise collecting means.

  The television receiver according to claim 7 is the television receiver according to claim 6, wherein the control means outputs in accordance with a difference between a level of the output ambient noise signal and an output level of the controlled sound. The audio output device is controlled so that the level increases or decreases.

  The television receiver according to claim 8 is the television receiver according to any one of claims 1 to 7, wherein the control means is configured to display the sound when the display device displays the generated character information. The voice output device is controlled so as not to output the signal.

  The television receiver according to claim 9 is the television receiver according to any one of claims 1 to 8, wherein a character information signal corresponding to an audio signal of the television broadcast is multiplexed with the television broadcast. The generating means generates the character information using a character information signal included in the television broadcast received by the receiving means.

  In order to achieve the above object, the signal processing apparatus according to claim 10 is a reception means for receiving an audio signal, a noise collection means for collecting ambient noise and outputting an ambient noise signal, and reception by the reception means. In a signal processing device comprising a generation means for generating character information according to the generated voice signal and a display device for displaying the generated character information, the signal processing apparatus according to the level of the ambient noise signal output from the noise collection means Control means for controlling the display device so as to display the generated character information.

  According to the television receiver of claim 1, since the display device is controlled so as to display the character information according to the level of the ambient noise signal, the user can view without disturbing the surrounding people even in the noise environment. In addition, an amplifier with a large output can be dispensed with.

  According to the television receiver of claim 2, when the ambient noise signal level is higher than a predetermined set value, the display device is controlled to display character information. Can be viewed without inconvenience, and an amplifier with a large output can be dispensed with.

  According to the television receiver of the third aspect, the display device includes the first display device that displays the character information and the second display device that displays the video information of the television broadcast. Therefore, it is possible to reliably read the character information by avoiding overlapping with the image of the television broadcast.

  According to the television receiver of claim 4, when the level of the ambient noise signal is higher than a predetermined set value, the first display device is controlled to display character information. You can watch without disturbing the people around you.

  According to the television receiver of claim 5, since the audio output device is controlled so that the output level becomes a predetermined constant value regardless of the level of the ambient noise signal, the output level of the audio output device is arbitrarily set. can do.

  According to the television receiver of claim 6, since the output level of the audio output device is increased or decreased according to the level of the ambient noise signal, the audio can be output at an appropriate output level without adjusting the output level of the audio output device. Can be output.

  According to the television receiver of claim 7, since the audio output device is controlled so as to increase or decrease the output level according to the difference between the level of the ambient noise signal and the audio output level, an appropriate output can be achieved even in a noise environment. Sound can be output at level.

  According to the television receiver of claim 8, since the audio output device is controlled so as not to output audio when the display device displays character information, it is possible to reliably eliminate the need to use an amplifier with a large output, Power consumption can be reduced.

  According to the television receiver of the ninth aspect, since the character information is generated using the character information signal included in the television broadcast, the character information can be accurately displayed.

  According to the signal processing device of claim 10, the character information corresponding to the received voice signal is generated, and the display device is controlled to display the character information according to the level of the ambient noise signal. It is possible to listen to the sound without disturbing the surrounding people, and an amplifier with a large output can be dispensed with.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a block diagram of a television receiver according to the first embodiment of the present invention.

  1, the television receiver 100 of FIG. 1 includes a TV reception demodulation circuit 8, an antenna 7 (reception means), a volume controller 9, and a character information conversion circuit 12 (generation) connected to the TV reception demodulation circuit 8, respectively. And a speaker 11 (audio output device) connected to the volume adjuster 9 via a speaker amplifier 10.

  The television receiver 100 also includes a microcomputer 6 (control means), a comparator 5 whose output terminal is connected to the microcomputer 6, a detector 3 connected to one input terminal of the comparator 5, A microphone 1 (noise collecting means) connected to the detector 3 via the microphone amplifier 2 and a storage device 4 connected to the other input terminal of the comparator 5 and storing a predetermined set value N1 are provided.

  The television receiver 100 is further connected to the character information conversion circuit 12 and the microcomputer 6, and a changeover switch 13 for turning on / off the output of the character information conversion circuit 12 according to the output of the microcomputer 6, and the TV reception demodulation circuit 8. And a synthesizer 14 which is connected to the changeover switch 13 and synthesizes both outputs, and a display 15 (display device) connected to the synthesizer 14.

  The TV reception demodulation circuit 8 demodulates the radio wave received by the antenna 7 into a video signal, an audio signal, and a character information signal corresponding to the audio signal. In the present embodiment, in the television signal received by the antenna 7, character information corresponding to sound is multiplexed as digital data in addition to video and audio signals of the broadcast program. The TV reception demodulation circuit 8 detects and processes these video signals, audio signals, and character information signals from the television broadcast signal received by the antenna 7.

  The volume adjuster 9 controls the level of the audio signal output from the TV reception demodulation circuit 8, the speaker amplifier 10 amplifies the audio signal output from the volume adjuster 9, and the speaker 11 The audio signal output from is converted into audio and output. The output level of the speaker 11 is constant at the level set by the user regardless of the level of ambient noise.

  The character information conversion circuit 12 converts the character information signal output from the TV reception demodulation circuit 8 into character information.

  The microphone 1 detects the sound output from the speaker 10 together with ambient noise, the microphone amplifier 2 amplifies the sound signal output from the microphone 1, and the detector 3 outputs the sound signal output from the microphone amplifier 2. Measure the level.

  The storage device 4 stores a predetermined set value N1 related to the level of the audio signal output from the microphone amplifier 2 (FIG. 2), and the comparator 5 stores the output level of the detector 3 and the storage device 4. The predetermined set value N1 is compared, and the comparison result is sent to the microcomputer 6.

  The changeover switch 13 turns on and off the output of the character information conversion circuit 12 according to a command from the microcomputer 6. The synthesizer 14 synthesizes the video signal output from the TV reception demodulation circuit 8 and the character information sent from the character information conversion circuit 12, and the display 15 displays the video synthesized by the synthesizer 14.

  When the output level of the detector 3 is larger than the predetermined set value N1 of the storage device 4 (FIG. 2), the microcomputer 6 turns on the changeover switch 13 and sends the output of the character information conversion circuit 12 to the synthesizer 14. To do. Thus, the synthesizer 14 synthesizes the video signal output from the TV reception demodulation circuit 8 and the character information transmitted from the character information conversion circuit 12, and the display unit 15 converts the video information and character information of the TV reception demodulation circuit 8 from each other. An image on which the character information of the circuit 12 is superimposed is displayed (FIG. 3).

  Further, when the output level of the detector 3 is smaller than the predetermined set value N1 of the storage device 4 (FIG. 2), the microcomputer 6 turns off the changeover switch 13 and cuts off the output of the character information conversion circuit 12. Thereby, the synthesizer 14 does not accept the character information output from the character information conversion circuit 12, and the display 15 displays only the video information of the TV reception demodulation circuit 8 (FIG. 4).

  FIG. 5 is a block diagram of a television receiver according to the second embodiment of the present invention.

  The television receiver 101 of FIG. 5 has basically the same configuration as the apparatus of FIG. 1, and the same components as those of the apparatus of FIG. Only the parts different from the apparatus 1 will be described.

  The television receiver 101 of FIG. 5 does not include the synthesizer 14, and the display 15 (first display device) is directly connected to the TV reception demodulation circuit. The changeover switch 13 is connected to a display 16 (second display device) that displays only character information.

  When the output level of the detector 3 is greater than the predetermined set value N1 of the storage device 4 (FIG. 2), the microcomputer 6 turns on the switch 13 and sends the output of the character information conversion circuit 12 to the display 16. Thus, the display 16 displays the character information of the TV reception demodulation circuit 8. The display 15 always displays only the video information of the TV reception demodulation circuit 8 (FIG. 6).

  Further, when the output level of the detector 3 is smaller than the predetermined set value N1 of the storage device 4 (FIG. 2), the microcomputer 6 turns off the changeover switch 13 to cut off the output of the character information conversion circuit 12, Thereby, the display 16 does not display anything. The display 15 always displays only the video information of the TV reception demodulation circuit 8 (FIG. 7).

  FIG. 8 is a block diagram of a television receiver according to the third embodiment of the present invention.

  The television receiver 102 in FIG. 8 is basically the same in configuration as the device in FIG. 1, and the same components as those in the device in FIG. Only portions different from the processing of FIG. 1 will be described.

  8 includes a detector 17 that detects the output level of the volume adjuster 9, one input terminal connected to the detector 17, the other input terminal connected to the detector 3, and an output terminal. Is connected to the microcomputer 6, and includes a comparator 18 that compares the output level of the detector 17 with the output level of the detector 3 and sends the comparison result to the microcomputer 6. The microcomputer 6 further includes a comparator. The volume controller 9 is controlled based on the comparison result sent from 18.

  The microcomputer 6 compares the difference A (= L1−) between the output level L1 of the detector 17 when the volume adjuster 9 outputs the reference volume level and the output level L2 of the detector 3 when the surroundings are silent. L2) is stored (FIG. 10), and the volume controller 9 is controlled so that the difference between the output level of the detector 17 and the output level of the detector 3 is always equal to A. Thereby, when the output level of the detector 3 becomes low, the microcomputer 6 sets the output level of the volume adjuster 9 so that the difference between the output level of the detector 17 and the output level of the detector 3 becomes equal to A. On the contrary, when the output level of the detector 3 is increased, the microcomputer 6 increases the output level of the volume controller 9.

  Similarly to the apparatus of FIG. 1, the microcomputer 6 turns on the changeover switch 13 when the output level of the detector 3 is larger than the predetermined set value N1 stored in the storage device 4 (FIG. 9). Then, the output of the character information conversion circuit 12 is sent to the synthesizer 14, and when it is smaller than the predetermined set value N1 (FIG. 9), the changeover switch 13 is turned off to shut off the output of the character information conversion circuit 12.

  As a result, when the output level of the detector 3 is higher than the predetermined set value N1 of the storage device 4 (FIG. 9), the display 15 displays the video information of the TV reception demodulation circuit 8 and the character information of the character information conversion circuit 12 as follows. When the superimposed image is displayed and the output level of the detector 3 is smaller than the predetermined set value N1 of the storage device 4 (FIG. 9), the output of the volume controller 9 increases as the ambient noise level increases, and the ambient noise As the level decreases, the output level of the volume adjuster 9 also decreases.

  FIG. 11 is a block diagram of a television receiver according to the fourth embodiment of the present invention.

  The television receiver 103 in FIG. 11 is basically the same in configuration as the device in FIG. 8, and the same components as those in the device in FIG. Only portions different from the processing of FIG. 8 will be described.

  The apparatus 103 of FIG. 11 does not include the synthesizer 14, and the display 15 is directly connected to the TV reception demodulation circuit. In addition, a display 16 that displays only character information is connected to the changeover switch 13.

  When the output level of the detector 3 is smaller than the predetermined set value N1 of the storage device 4 (FIG. 9), the microcomputer 6 turns off the changeover switch 13 to shut off the output of the character information conversion circuit 12, and FIG. The output level of the volume adjuster 9 is adjusted in the same manner as in the apparatus (FIG. 10).

  When the output level of the detector 3 is greater than the predetermined set value N1 of the storage device 4 (FIG. 9), the microcomputer 6 turns on the switch 13 and sends the output of the character information conversion circuit 12 to the display 16. Thus, the display 16 displays the character information of the TV reception demodulation circuit 8.

  In the first to fourth embodiments, when the output level of the detector 3 is higher than the predetermined set value N1 of the storage device 4, it is possible to control so that the speaker does not output sound.

  The signal processing device of the present invention includes a television receiver, a radio receiver with a display device, and a transceiver with a display device.

  Each of the radio receiver and the transceiver includes an antenna (receiving means) that receives an audio signal, a microphone (noise collecting means) that collects ambient noise and outputs an ambient noise signal, and an audio signal received by the antenna. A character information conversion circuit (generating means) that generates character information according to the above, a display (display device) that displays the generated character information, and a microcomputer (control means), and the surroundings output from the microphone The display is controlled to display character information according to the level of the noise signal.

  With such a configuration, the same effects as those of the television receiver can be obtained.

It is a block diagram of the television receiver which concerns on the 1st Embodiment of this invention. It is a graph which shows the relationship between the output level of the detector in FIG. 1, and the level of ambient noise. It is a figure used for demonstrating the example of a display of the indicator in FIG. It is a figure used for demonstrating the example of a display of the indicator in FIG. It is a block diagram of the television receiver which concerns on the 2nd Embodiment of this invention. It is a figure used for demonstrating the example of a display of the indicator in FIG. It is a figure used for demonstrating the example of a display of the indicator in FIG. It is a block diagram of the television receiver which concerns on the 3rd Embodiment of this invention. It is a graph which shows the relationship between the output level of the detector in FIG. 8, and an ambient noise level. It is a graph which shows the relationship between the input level and output level of the detector in FIG. It is a block diagram of the television receiver which concerns on the 4th Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Microphone 3 Detector 4 Memory | storage device 5 Comparator 6 Microcomputer 8 TV reception demodulation circuit 9 Volume controller 11 Speaker 12 Character information conversion circuit 13 Changeover switch 14 Synthesizer 15 Display

Claims (10)

  Receiving means for receiving a television broadcast, a noise collecting means for collecting ambient noise and outputting an ambient noise signal, and generating character information corresponding to the audio signal of the television broadcast received by the receiving means Means, a display device for displaying the generated character information, and a control for controlling the display device to display the generated character information according to the level of the ambient noise signal output from the noise collecting means And a television receiver.   The control means displays the generated character information when the level of the ambient noise signal output from the noise collecting means is higher than a predetermined set value, and generates the generated character information when the level is lower than the predetermined set value. 2. The television receiver according to claim 1, wherein the display device is controlled to erase the character information.   The display device includes a first display device that displays the generated character information, and a second display device that displays a video signal of a television broadcast received by the receiving unit, and the control 2. The television according to claim 1, wherein means controls the first display device to display the generated character information in accordance with a level of an ambient noise signal output from the noise collecting means. Receiver device.   The control means controls the first display device to display the generated character information when the level of the ambient noise signal output from the noise collecting means is higher than a predetermined set value. The television receiver according to claim 3.   It further comprises an audio output device that outputs the audio signal of the television broadcast received by the receiving means as sound, and the control means has an output level irrespective of the level of the ambient noise signal output from the noise collecting means. 5. The television receiver according to claim 1, wherein the audio output device is controlled to be a predetermined constant value. 6.   The apparatus further includes an audio output device that outputs the audio signal of the television broadcast received by the receiving unit as audio, and the control unit increases or decreases the output level according to the level of the ambient noise signal output from the noise collecting unit. The television receiver according to any one of claims 1 to 4, wherein the audio output device is controlled to do so.   The said control means controls the said audio | voice output apparatus so that an output level may increase / decrease according to the difference of the level of the said output surrounding noise signal and the output level of the said controlled audio | voice. 6. The television receiver according to 6.   The said control means controls the said audio | voice output apparatus so that the said audio | voice is not output when the said display apparatus displays the produced | generated character information. The television receiver described.   A character information signal corresponding to the audio signal of the television broadcast is multiplexed in the television broadcast, and the generating means uses the character information signal included in the television broadcast received by the receiving means to use the character information signal. 9. The television receiver according to claim 1, wherein information is generated.   Receiving means for receiving an audio signal; noise collecting means for collecting ambient noise and outputting an ambient noise signal; generating means for generating character information corresponding to the audio signal received by the receiving means; And a display device for displaying the character information, wherein the display device is controlled to display the generated character information according to the level of the ambient noise signal output from the noise collecting means. A signal processing apparatus comprising a control means.

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