JP2914179B2 - TV receiver capable of deleting specific audio - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a TV receiver, and more particularly, to a TV receiver capable of eliminating a specific sound.

[0002]

2. Description of the Related Art FIG. 4 is a block diagram showing a configuration of a general TV receiver. This TV receiver receives a TV signal including a video signal and an audio signal from a broadcasting station, and
Selects a TV channel and converts the frequency to an intermediate frequency. The TV signal, which has been converted to an intermediate frequency signal, is amplified in the intermediate frequency amplifying circuit 2 and is split into two signals, a video signal and an audio signal. Synchronous circuit 4
, A synchronization signal is extracted, a video signal is detected by a video circuit 5, and a CRT (cathode ray tube) 7 is passed through a video output circuit 6.
And an image is obtained on a CRT. The audio signal is detected by the audio circuit 11 and is amplified by the amplifier circuit 12.
, A sound is obtained from the speaker 13.

[0003]

As described above, the conventional TV
The receiver faithfully reproduces a video signal and an audio signal based on a TV signal from a broadcasting station. In particular, the audio signal is configured such that demodulated audio is directly output from a speaker. As for this sound, even when a main sound, a sub sound, or the like is selected in the recent sound multiplexing method, all sounds included in the selected sound channel are demodulated and output as sounds. For this reason, TV
When you want to select and output only specific audio that is output continuously or discontinuously while receiving an image with a receiver, for example, while outputting the audio of the audience in live broadcast of baseball or soccer, announcer and commentary When it is desired to delete only the voice of the user, it is impossible to prevent only such specific voice from being output from the speaker.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a TV receiver capable of erasing only a part of the sound received by the TV receiver so that the user can view the TV. Another object of the present invention is to provide a TV receiver capable of deleting only a desired specific sound.

[0005]

The TV receiver of the present invention comprises:
An audio circuit for obtaining audio from a received TV signal includes an audio processing circuit including a memory for storing a specific audio signal and an erasing circuit for erasing a component of the specific audio signal stored from the sequentially input audio signal. And a video circuit for obtaining a video from the received TV signal is provided before the audio processing circuit .
A process of obtaining a video from the video signal for a time corresponding to a time required for the erasing process of the audio signal component in the erasing circuit.
A delay circuit having a delay time for delay is provided.

For example, the audio processing circuit includes a memory for storing a specific audio signal, a processing circuit for obtaining frequency distribution data of the stored specific audio signal, and a processing circuit for obtaining frequency distribution data of a sequentially input audio signal. And a comparing means for comparing each frequency distribution data of the specific audio signal and the audio signal sequentially inputted, and an audio signal corresponding to the frequency distribution data from the sequentially inputted audio signal when both frequency distribution data match. And an erasing circuit for erasing.

Alternatively, the audio processing circuit includes a processing circuit for obtaining frequency distribution data of an input audio signal, a memory for storing frequency distribution data of a specific audio signal, and a memory for storing frequency distribution data of a sequentially input audio signal. A configuration including comparison means for comparing stored frequency distribution data and an erasing circuit for erasing an audio signal corresponding to the frequency distribution data from sequentially input audio signals when the two frequency distribution data match. Is also good.

Further, the processing circuit to obtain a frequency distribution data, for example, a Fourier transform circuit for Fourier transforming the audio digital signal, the formant processing circuit for obtaining the formant distribution from the output of the Fourier transform circuit.

[0009]

When the specific audio signal to be deleted is stored in the memory, the frequency distribution data of the sequentially input audio signal and the specific audio signal are compared, and when they match, the audio corresponding to the frequency distribution data is obtained. The signal is deleted from the input audio signal. For this reason, a sound from which only the specific sound signal has been deleted is output from the sound circuit, and it is possible to view the sound with only the sound desired by the viewer deleted.

[0010]

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing an example of the TV receiver of the present invention. There is a tuner 1 for selecting a TV signal of a required channel from a plurality of received TV signals, and the TV signal received by the tuner 1 is frequency-converted as an intermediate frequency signal. This intermediate frequency signal is amplified by the intermediate frequency amplifier circuit 2 and is divided into two parts, a video signal and an audio signal. The video circuit that processes the video signal has a delay circuit 3 that delays the signal by a predetermined time as described later. The output of the delay circuit 3 is branched into two, and one of the signals is input to the synchronization circuit 4, where the synchronization signal is extracted and amplified. The other signal is input to the video circuit 5, where the video signal is detected,
And amplify this. Then, the synchronization signal and the video signal are input to the video output circuit 6, where the video signal is synchronized, and the CRT 7 outputs a video.

On the other hand, among the outputs of the intermediate frequency amplifying circuit 2, the audio signal input to the audio signal processing circuit side is converted into a digital signal in an A / D conversion circuit 8. Then, in the state of the digital signal, the sound processing circuit 9 performs a process of deleting a desired sound signal.
The audio signal for which this processing has been completed is output to the D / A conversion circuit 10.
Is returned to an analog signal, detected by an audio circuit 11, amplified by an amplifier circuit 12, and output from a speaker 13 as audio.

As shown in FIG. 2, the audio processing circuit 9 has a function of erasing only a desired audio signal from an input audio signal, and a memory 21 for recording a part of the audio signal to be erased. If formant to obtain Fourier transform circuit 22a to Fourier transform the audio signal stored in the audio signal and a memory 21 that has been input, and 22b, the formant distribution as voiceprint and formant processing each audio signal Fourier transform A processing circuit 23a, 23b, a formant comparison circuit 24 for comparing the input audio signal from which a formant distribution is obtained with the stored audio signal in the formant processing circuit, and a component of the input audio signal when both match. An audio erasing circuit 25 for canceling and erasing an input audio signal is provided, and a control circuit 26 for controlling each of the circuits is provided. .

In order to store a desired audio signal, a switch 27 which is turned on only when the audio signal to be stored is output from the TV receiver is connected to the memory 21. I have. This switch 27
For example, it is configured to be turned on under the control of the control circuit 26 based on the operation of the viewer. The formant distribution described above is used as a voiceprint.
The individual difference is clear, and is already used as a method for determining a specific speaker.

In this TV receiver, a circuit for processing a video signal performs processing such as detection and amplification of a received video signal, except that the video signal is delayed by a predetermined time in a delay circuit 3. Outputting an image to a CRT is the same as that of a conventional TV receiver, and a detailed description thereof will be omitted. The operation of the audio processing circuit is the same as the operation of the audio circuit of the conventional TV receiver except for the A / D conversion circuit 8, the D / A conversion circuit 10, and the audio processing circuit 9, so that the audio processing is performed. Except for once converting a signal into a digital signal and performing a process of detecting and amplifying a received voice signal and outputting voice from a speaker, except that a voice erasing operation is performed in the voice processing circuit 9, This is the same as a conventional TV receiver, and a detailed description thereof will be omitted.

Here, when the viewer desires to delete a specific voice, particularly a specific speaker's voice and not output the voice from the speaker 13, at the timing when the voice of the speaker is output from the speaker 13. The switch 27 is turned on for a predetermined short time via the control circuit 26. Thus, the voice signal of the speaker (hereinafter, referred to as a specific voice signal) is stored in the memory 21 as an A / D converted voice digital signal. Then, the control by the control circuit 26, the particular audio signal stored in the memory 21 is subjected to Fourier transform in the Fourier transform circuit 22b, the formant distribution is obtained in the further formant processing circuit 23b, and data formant comparison of formant distribution Input to the circuit 24.

At the same time, the audio signals received over time are sequentially A / D converted and input to the audio processing circuit 9. Therefore, the input audio digital signal is Fourier transform of <br/> are in sequential Fourier transform circuit 22a, further formant distribution is obtained in the formant processing circuit 23a, the data is formant comparator circuit 24
Is input to Then, in the formant comparison circuit 24,
The formant distribution data of the specific audio signal is compared with the formant distribution data of the sequentially input received signal.
As a result of the comparison, when they match, in the sound elimination circuit 25, the data portion of the sound digital signal corresponding to the formant distribution data matched by the comparison is canceled from the sound digital signal sequentially input.

As a result, the audio digital signal output from the audio elimination circuit 25 has the audio digital signal having the same formant distribution as the specific audio signal stored in the memory 21 removed. Then, the digital audio signal output from the audio elimination circuit 25 is converted into an analog audio signal in the D / A conversion circuit 10, and output as audio from the speaker 13 via the audio circuit 11 and the amplifier circuit 12. As a result, as for the sound from the speaker 13, only the specific sound signal is deleted, and the other sounds are output as they are. Thus, for example, it is possible to output only the voice of the commentator while outputting the voice of the spectator in the live broadcast of the competition. Alternatively, it is possible to delete only the sound of a specific actor in a play movie.

Since the audio processing circuit 9 requires a certain amount of time, the above-mentioned delay circuit 3 is provided on the video circuit side to synchronize with the video signal. If the delay time in the delay circuit 3 is made to correspond to the time required for processing in the audio processing circuit 9, regardless of the audio delay in the audio processing circuit 9,
Video on the CRT 7 can be synchronized with audio.

If a rewritable memory is used as the memory 21, a new specific audio signal is stored every time the switch 27 is operated, so that the specific audio signal to be deleted can be changed at any time. In addition, various arithmetic circuits such as a subtractor can be used as the voice elimination circuit 25.

Here, as shown in FIG. 3, the voice processing circuit previously obtains a formant distribution of the voice of the speaker to be erased, stores this distribution in a memory, and reads out this distribution from the memory. You may comprise so that it may compare with the audio signal of a received signal. That is, in the drawing, the audio digital signal obtained from the A / D conversion circuit 8 is sequentially obtained through a Fourier transform circuit 22 and a formant processing circuit 23 to obtain a formant distribution.

When the switch 27 is turned on in synchronization with the voice of the speaker to be deleted, the memory 21 stores the formant distribution data of the specific voice signal of the speaker. Thereafter, the formant distribution of the sequentially received audio digital signal is obtained, and the formant distribution data is compared with the formant distribution data stored in the memory 21 in the formant comparison circuit 24. By canceling and canceling the audio digital signal corresponding to the formant distribution, it becomes possible to erase only the specific audio signal as in the case of the above embodiment. In this configuration, only one Fourier transform circuit 22 and one formant processing circuit 23 are required, and the configuration can be simplified.

In the above embodiment, the formant distribution is used to distinguish the speaker's voice from other voices.
The voice of the speaker may be determined using other frequency distribution characteristics. In this case, the formant processing circuit and the formant comparison circuit in each of the above embodiments may be replaced with unique frequency distribution processing circuits and frequency distribution comparison circuits, respectively.

[0023]

As described above, according to the present invention, the audio circuit includes a memory for storing a specific audio signal, and an erasing circuit for erasing a component of the specific audio signal stored from the sequentially input audio signal. And the video circuit is provided with a delay circuit having a delay time corresponding to the processing time in the audio processing circuit. Can erase the specific audio signal stored in the memory from the sequentially input audio signal. For this reason, a sound from which only the specific sound signal has been deleted is output from the sound circuit, and it is possible to view the sound with only the sound desired by the viewer deleted. In this case, the delay circuit provided in the video circuit is used.
Path to remove audio signal components in the audio processing circuit.
Video from the video signal for the required time
By delaying the processing, the temporal coincidence between the video and the audio can be ensured.

Therefore, for example, in the broadcast of foreign language education, the voice of a specific speaker is erased, and the listener speaks the part, and the ability is further promoted. If the player is well aware of the content of the competition, the use of viewing by TV receivers will be expanded, such as by eliminating the commentator's voice, transmitting only the cheering sounds of the stadium, and allowing the viewer to view without losing the sense of presence. There are obtained effects such as enabling viewing in an environment suitable for each individual.

Here, the audio processing circuit obtains the frequency distribution data of the specific audio signal after storing the specific audio signal in the memory and obtains the frequency distribution data of the audio signal sequentially inputted. By comparing each frequency distribution data of the audio signal and erasing the specific audio signal from the input audio signal based on the comparison result,
Once the specific voice has been stored, it is possible to realize the viewing with the specific voice deleted thereafter.

The audio processing circuit obtains the frequency distribution data of the input audio signal, stores the frequency distribution data of the specific audio signal in the memory, and stores the frequency distribution data of the input audio signal together with the frequency distribution data of the input audio signal. By comparing the frequency distribution data and the specific audio signal from the input audio signal based on the comparison result, the processing circuit for obtaining the frequency distribution data is simplified, The configuration of the audio processing circuit can be simplified.

Further, as a processing circuit for obtaining frequency distribution data, a Fourier transform for performing a Fourier transform on the audio digital signal is performed .
A conversion circuit, by providing a formant processing circuit for obtaining the formant distribution from the output of the Fourier transform circuit, for formant distribution individual differences are clear, it erases only the very high precision speech of a particular speaker It becomes possible. .

[Brief description of the drawings]

FIG. 1 is a block diagram showing a schematic configuration of a TV receiver according to the present invention.

FIG. 2 is a block diagram illustrating an internal configuration of an embodiment of a voice processing circuit.

FIG. 3 is a block diagram showing an internal configuration of an audio processing circuit according to another embodiment of the present invention.

FIG. 4 is a block diagram showing a schematic configuration of a conventional general TV receiver.

[Description of Signs] 1 Tuner 3 Delay circuit 4 Synchronization circuit 5 Video circuit 7 CRT 8 A / D conversion circuit 9 Audio processing circuit 10 D / A conversion circuit 11 Audio circuit 13 Speaker 21 Memory 22 (22a, 22b) Fourier conversion circuit 23 (23a, 23b) Formant processing circuit 24 Formant comparison circuit 25 Voice elimination circuit 26 Control circuit 27 Switch

Claims (5)

(57) [Claims] 1. A TV receiver comprising: a video circuit that obtains an image based on a video signal in a received TV signal; and an audio circuit that obtains audio based on an audio signal in the received TV signal. Comprises an audio processing circuit including a memory for storing a specific audio signal, and an erasing circuit for erasing a component of the stored specific audio signal from the sequentially input audio signal. said circuit
The process of obtaining an image from the video signal is delayed by a time corresponding to the time required for the erasing process of the audio signal component in the erasing circuit.
A TV receiver capable of erasing a specific sound, comprising a delay circuit having a delay time for extending the delay time. Wherein said audio circuit, the TV signal A / D
An A / D conversion circuit for converting, a voice processing circuit for performing voice erasure processing on the digitally converted signal, a D / A conversion circuit for performing D / A conversion of the voice erasure-processed signal, and an analog-converted signal The TV receiver capable of erasing specific sound according to claim 1 , further comprising an audio circuit for detecting a signal, and an amplifier circuit for amplifying the detected signal and outputting the amplified signal from a speaker. 3. A sound processing circuit comprising : a memory for storing a specific audio signal; a processing circuit for obtaining frequency distribution data of the stored specific audio signal; and a processing for obtaining frequency distribution data of a sequentially input audio signal. A circuit, comparing means for comparing each frequency distribution data of the audio signal sequentially input with the specific audio signal, and an audio signal sequentially inputting an audio signal corresponding to the frequency distribution data when both frequency distribution data match. The TV receiver capable of erasing a specific sound according to claim 2 , further comprising an erasing circuit for erasing the signal. 4. An audio processing circuit comprising : a processing circuit for obtaining frequency distribution data of an input audio signal; a memory for storing frequency distribution data of a specific audio signal; and a frequency distribution data of a sequentially input audio signal. And comparison means for comparing the stored frequency distribution data with the stored frequency distribution data, and an erasing circuit for erasing an audio signal corresponding to the frequency distribution data from the sequentially input audio signal when the two frequency distribution data match. erasable TV receiver specific audio according to claim 2. 5. The processing circuit for obtaining the frequency distribution data comprises a Fourier transform circuit for performing a Fourier transform on the audio digital signal, and a formant processing circuit for obtaining a formant distribution from an output of the Fourier transform circuit. erasable TV receiver a particular voice as described in 4.