JPH0285765A - Digital television - Google Patents

Abstract

PURPOSE:To display the frequency spectrum of an input acoustic signal in the form of a bar graph, etc., by providing an A/D conversion section, digital signal processing section, picture memory, 1st and 2nd picture display processing sections, etc. CONSTITUTION:An A/D conversion section 3 samples acoustic signals picked up by a microphone 2 at a prescribed frequency and converts the sampled signals into digital signals. A digital signal processing section 4 performs arithmetic operations on the sampled data after high-speed Fourier transformation and analyzes the frequency of the inputted signals. After analysis, the section 4 converts the frequency spectrum data into picture data. A picture memory 5 stores the pictures data. The 1st picture display processing section 6 performs a display process for displaying a spectrum on a master screen in the form of a bar graph or graphic in accordance with the stored picture data. The 2nd picture processing section 7 performs a display process for displaying the spectrum on a slave screen in the form of a bar graph or graphic in accordance with the picture data. A changeover switch 8 switches the picture data stored in the memory 5 to the processing sections 6 and 7.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention is based on PIP (Picture In Pictu).
r) Digital television that has a function, more specifically, a digital television that can analyze the frequency spectrum of the sound picked up by a microphone and graphically display the spectrum as a bar plum or an image according to the spectrum. It's about John.

[Conventional example] In recent years, televisions have been made with transistorized circuits, IC
With the advancement of technology, including technology and LSI technology, digital signal processing has shifted from analog technology to digital technology. Digital signal processing has many advantages over analog signal processing in that it improves the performance of equipment and enables multifunctionality. Digital television with such advantages has a large capacity.

Lower-priced memory was added, and various functions were realized.

One of these functions is the PIF function. This PIF function can display video from another system as a sub screen and superimpose it on the four corners of the main screen, or display a part of the main screen or a TV broadcast of a counter program. It can be displayed on a sub screen.

On the other hand, those using the same digital signal processing technology,
I have a spectrum analyzer. A spectrum analyzer is a measurement device that samples a human signal waveform, performs fast Fourier transform, performs arithmetic processing, and analyzes and displays the frequency of the input signal.

[Problems to be Solved by the Invention] Incidentally, although digital televisions having various functions have been proposed, there is no one that analyzes and displays input signals like the spectrum analyzer. That is, adding an expensive item such as a spectrum analyzer becomes an obstacle to popularization in general households.

However, as the digital television mentioned above,
Displaying sound signals in some form can expand their use as a means of expression. On the other hand, for example, in audio equipment, there are some that display the audio balance and stereo balance in the form of bar graphs, which are appreciated by consumers because of their ease of viewing.

This invention expands the use of digital television by analyzing the frequency of an input sound signal like a spectrum analyzer and expressing the sound in a different way, such as by displaying the analyzed frequency spectrum as a bar graph or graphic. The aim was to provide a digital television that could visually enjoy sound in a new way.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides an A/D conversion means for sampling a sound signal picked up by a microphone at a predetermined frequency and converting it into a digital signal; digital signal processing means that uses frequency spectrum data obtained by frequency spectrum analysis as image data; image data storage means that stores the image data; and screen display that performs processing to display this image data on the screen. processing means, Fourier transforms the input sound signal to obtain its frequency spectrum, converts the frequency spectrum into image data, performs a predetermined display process on this image data, and displays a bar graph corresponding to the frequency spectrum on the screen. , or a graphic display of images.

[Function] In the above configuration, when a sound signal picked up by the microphone is input, the sound signal is sampled at a predetermined frequency by the AID conversion means and converted into a digital signal. The digital sound data is subjected to frequency spectrum analysis by the digital signal processing means, similar to a spectrum analyzer, to obtain frequency spectrum data of the picked up sound. The frequency spectrum data is stored as image data in the image data storage means, and processed by the screen display processing means to display a bar graph or graphic on the main screen or the child screen.

Then, the frequency spectrum of the input sound signal is displayed as a bar graph on the screen of the digital television, and the frequency spectrum is also displayed graphically. In a graphic display, the brightness, color, color, etc. of a pixel according to the frequency spectrum data is displayed on each divided part of the digital television screen, and each divided part of this screen shows the brightness, color, color, etc. of a pixel according to the frequency spectrum data. It can be changed in various ways depending on the frequency spectrum of the input sound signal.

[Example] Hereinafter, one embodiment of the present invention will be described based on the drawings.

In FIG. 1, a digital television 1 includes an A/D converter 3 that samples a sound signal (analog signal) picked up by a microphone 2 at a predetermined frequency and converts it into a digital signal.

A digital signal processing unit 4 performs arithmetic processing on the sampled data after fast Fourier transform, analyzes the frequency of the input signal, and converts the frequency spectrum data into image data, and an image memory 5 stores the image data. , a first screen display processing unit 6 that performs display processing to display a spectrum as a bar graph or graphic on a main screen according to the stored image data, and a first screen display processing unit 6 that performs display processing to display a spectrum as a bar graph or graphic on a sub screen according to the image data. ,
Alternatively, a second screen display processing section 7 performs display processing for displaying graphics, and the image data stored in the image memory 5 is transferred to the first screen display processing section 6 and the second screen display processing section 7. A changeover switch 8 is provided for switching to.

Although not shown in the figure, the digital television 1 is equipped with a circuit for inputting television signals, video signals, etc. and displaying an image on a picture tube in accordance with the signals, as in the conventional case. The operation of the digital television will be explained based on the display state diagrams of FIGS. 2 and 3.

First, it is assumed that the digital television is operated, for example, by displaying a bar graph on the main screen, and the selector switch 8 is switched to the terminal a side.

Then, the sound from the sound source 0 is picked up by the microphone 2, and the sound signal is sampled at a predetermined frequency by the A/L converter 3 and converted into digital data. In the digital signal processing section 4, the digital data is read and processed for fast Fourier transformation and display.

At this time, similarly to the spectrum analyzer, the five read time series data are stored in a permuted order for the fast Fourier transform processing, but window function processing is also performed on them.

Subsequently, the stored data is subjected to Fourier transform processing and cumulative processing is performed.

That is, the average of the results of multiple Fourier transforms is taken, mixed noise, etc. are removed, and the original signal data is extracted. The original data corresponds to the frequency spectrum data of the input sound signal, and this data is stored in the image memory 5 as image data.

In this way, the data stored in the image memory 5 is manually input to the first screen display processing section 6 via the changeover switch 8. In the first screen display processing section 6, display processing is performed on the input image data to display the frequency spectrum of the input sound signal in a bar graph, as shown in FIG. output to the section. Then,
The frequency spectrum of the analyzed sound signal is displayed in the form of a bar graph on the main screen of the picture tube. Moreover, the bar graph changes depending on the input sound signal.

Sound is expressed in the form of images.

It is also assumed that the operation of the digital television 1 is displayed as a bar graph on the sub-screen, for example, and the changeover switch 8 is switched to the terminal side.

Then, the image data read from the image memory 5 is processed by the second screen processing section 7.

The frequency spectrum of the input sound signal is displayed in the form of a bar graph on a sub-screen superimposed on the main screen of the picture tube.

In addition, instead of the sound go, as shown in FIG.
2 and an equalizer circuit 11 for flattening the amplitude frequency characteristics of a speaker 13 and the like is input to the microphone 2. Then, the frequency spectrum of the sound signal is displayed in the form of a bar graph on the picture tube of the digital television 1. Therefore, by adjusting the equalizer circuit 1l while looking at the bar graph, the frequencies can be equalized. By inputting a music source to the adjusted equalizer system, it is possible to enjoy music with even higher fidelity and a sense of realism.

In addition, the operation of digital television.

It is assumed that the main screen is displayed graphically and the selector switch 8 is switched to the terminal a side. Then, as shown in FIGS. 4 and 5, the digital signal processing section 4 processes spectrum data 1, 2, . . . obtained at each IHz interval, for example. ....

n is stored in the image memory 5 as image data.

In this way, the data stored in the image memory 5 is input to the first screen display processing section 6 via the changeover switch 8. In the first screen display processing section 6.

As shown in FIG. 6, the input image data is subjected to a graphic display process of converting it into data such as pixel brightness, color and saturation, and the graphic display signal is output to the picture tube. Then, the brightness of each pixel, the color saturation, and the like are changed and displayed on the main screen according to the frequency spectrum of the sound picked up by the microphone 2. Furthermore, if the picked-up sound is music, the areas 1, 2, etc. are equally divided depending on the music. ..., since the brightness and saturation of one pixel in the n part can be changed, it changes like an abstract painting, allowing you to enjoy unusual images while listening to music, expanding the use of digital television. .

[Effects of the Invention] As explained above, the digital television of the present invention has an analysis function that spectrally analyzes the sound signal picked up by the microphone, and stores frequency spectrum data generated by the analysis function as image data. Since it is equipped with an image data storage means and a screen display function that displays bar graphs and graphics such as pixel brightness, color, and saturation based on the image data, it can be displayed on the digital television screen (main screen, sub screen). can display the frequency spectrum of the input sound signal in the form of a bar graph, and can also graphically display a colored image according to the frequency spectrum. This has the effect of expanding its use.

[Brief explanation of the drawing]

FIG. 1 is a schematic partial block diagram of a digital television showing an embodiment of the present invention, FIGS. 2 and 6 are state diagrams showing the display screen of the digital television, and FIG. 3 is a state diagram showing the display screen of the digital television. - A schematic block diagram of a sound source device used in a television, FIGS. 4 and 5 are diagrams for explaining the operation of the digital television. In the figure, 1 is a digital television, 2 is a microphone, 3 is an AID converter, 4 is a digital signal processor,
5 is an image memory, 6 is a first screen display processing section, and 7 is a second screen display processing section.
This is the screen display processing section. Patent applicant: Fujitsu General Co., Ltd. Representative, Patent attorney: Takuya Ohara Figure 4 and Figure 6

Claims (2)

[Claims] (1) A that samples the sound signal picked up by a microphone at a predetermined frequency and converts it to digital.
/D conversion means, digital signal processing means for converting frequency spectrum data obtained by frequency spectrum analysis of the sound signal into image data, image data storage means for storing the image data, and displaying the image data on the screen. screen display processing means for performing processing for display;
The input sound signal is Fourier-transformed to obtain its frequency spectrum, and the frequency spectrum is used as image data, and this image data is subjected to predetermined display processing to graphically display a bar graph or an image according to the frequency spectrum on the screen. Digital television characterized by: (2) The screen display processing means includes a first and a second screen display processing section, the first screen display processing section displays the image data on the main screen of the screen, and the second screen display processing section displays the image data on the main screen of the screen. The digital television according to claim 1, wherein the processing section displays the image data on a sub-screen of the screen.