JPH1032507A - Teletext multiplex broadcast receiver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To store a voice signal and character data altogether. SOLUTION: In the receiver used for a teletext multiplex broadcast system where the main broadcast program sends a voice signal and a sub broadcast program sends character data, a signal received by an antenna 21 is tunned and detected by an AM tuner 22 and the resulting signal is outputted to an amplifier 23. An analog voice signal outputted from the amplifier 23 is converted into digital data by an A/D converter 26 when a user operates a switch 29 and the data are stored in an application RAM 28 under the control of a microcomputer 27. The digital voice data stored in the application RAM 28 are outputted to a D/A converter 30, in which the data are converted into an analog voice signal and outputted to the amplifier 23 and sounded form a speaker 24 as a sound.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a text multiplex broadcast receiving apparatus used in a text multiplex system for multiplexing and transmitting text data on broadcast radio waves.

[0002]

2. Description of the Related Art FM multiplex broadcasting, which transmits character information and the like by utilizing a gap between FM broadcasting radio waves, has been put to practical use.

[0003]

By the way, in a text multiplex broadcasting system in which sound is transmitted in a main broadcast and character data is transmitted in a sub broadcast, on the receiving side, the sound is processed as an analog signal and the character data is converted as digital data. It is processed. Therefore, the conventional receiving device cannot store the voice signal and the character data together.

[0004] It is an object of the present invention to be able to store voice signals and character data together.

[0005]

SUMMARY OF THE INVENTION The present invention relates to a receiver for use in a text multiplex broadcasting system for multiplexing and transmitting text data to broadcast radio waves, and a receiving apparatus for receiving a main broadcast audio signal and a sub broadcast text data. Means, analog / digital converting means for converting an analog voice signal received by the receiving means into digital data, and storing digital data converted by the analog / digital converting means and character data received by the receiving means. Storage means for converting the digital data stored in the storage means into an analog audio signal, and audio output means for outputting the audio signal converted by the digital / analog conversion means as audio. Display means for displaying character data stored in the storage means.

According to the present invention, digital voice data and character data stored in the storage means can be read and output as voice, and the character data can be displayed at the same time.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a circuit block diagram of a text multiplex broadcasting device that transmits an audio signal as a main broadcast and transmits text data as a sub broadcast.

The outputs of the microphone 1 and the audio devices 2 and 3 including a record player, a CD disk, and a recording / reproducing device are selected by a selection circuit 4 and output to an encoding circuit 5.
The selection circuit 4 selects one of a voice output from the microphone 1, or music or recorded voice output from the audio devices 2, 3,..., Or a plurality of them, and selects the voice or the voice. The result of mixing the tone and the musical tone is output to the encoding circuit 5.

[0009] The encoding circuit 5 encodes the voice and the like output from the selection circuit 4 into digital signals and temporarily stores them in a buffer 6. The digital signal stored in the buffer 6 is decoded by the decoding circuit 7 and converted into an analog audio signal, further converted into a stereo signal and output to the mixing circuit 8.

The input unit 9 is a key input unit for inputting character data and the like to be transmitted in the sub broadcast. The character data input from the input unit 9 is written into the character storage unit 11 under the control of the control circuit 10.

Here, the configuration of the character storage unit 11 will be described with reference to FIG. The character storage unit 11 includes a character data storage area 11a for storing character data, and a time data storage area 11b for storing time data indicated by the character data.
And a plurality of storage areas, each of which is a set of three storage areas of a control data storage area 11c for storing character control data such as a character blinking cycle and black-and-white inverted display information.

When transmitting character data, the control circuit 10 compares the time data stored in the character storage unit 11 with the current time measured internally, and determines the time indicated by the time data for a certain period of time. First, control data and character data are read and output to the multiplexing device 12.

In general, character data is read from the character storage unit 11 on the transmitting side, the read character data is encoded, and the time required for frequency-modulated transmission and the character data received on the receiving side are decoded. Since the total time required to display based on the control data is longer than the time from transmitting the audio signal to receiving it, the timing at which the character data is displayed on the receiving side and the timing at which the audio is output are different. It will be spelled out.

Therefore, in the present embodiment, the time required for the transmission side to encode and transmit the control data and character data stored in the character storage unit 11 and the control data and the character data to be restored on the receiving side. The total time (predetermined time) required for display is calculated in advance, and when the current time is a predetermined time before the predetermined time indicated by the time data stored in the character storage unit 11, the time is calculated. Character control data and character data corresponding to the data are read and transmitted, and when a predetermined time has elapsed and a predetermined time has come, voice data is transmitted.

By doing so, on the receiving side,
At a predetermined time, character data can be restored and displayed, and a voice signal can be received and output at that time. For example, the time is reported by text and voice at the exact time when a time signal should be reported. can do.

Returning to FIG. 1, the mixing circuit 8 mixes the stereo signal, the audio data output from the decoding circuit 7 and the encoded character data output from the multiplexing device 12, and , And the signals are frequency-modulated in the FM transmitter 13 and transmitted from the antenna 14.

Next, the configuration of a receiver for receiving broadcast waves transmitted from the teletext broadcasting apparatus described above will be described with reference to FIG. The FM tuner 22 demodulates the signal received by the antenna 21 based on the phase control signal output from the PLL circuit 25. The demodulated audio signal is amplified by the amplifier 23 and output from the speaker 24 as audio. The analog audio signal output from the amplifier 23 is converted to digital data by the A / D converter 26 and output to the microcomputer 27 when the user operates the recording switch 29A of the switch input unit 29. The microcomputer 27 stores digital voice data in a voice storage area 28a of the application RAM 28. This application RAM 28
Is read out by the microcomputer 27 and output to the D / A converter 30 as described later. And the D / A converter 3
The signal is converted to an analog audio signal by 0, output to the amplifier 23 described above, and output from the speaker 24 as audio.

From the signal tuned by the FM tuner 22, a signal of a specific band (sub broadcast signal) is extracted by a band-pass filter 31, detected by a detection LSI 32, and output to a microcomputer 27. The microcomputer 27 processes the character data according to the character control data among the digital data output from the detection LSI 32, that is, the character control data and the character data, and
The image is displayed on the LCD panel 34 via the D driver 35. When the recording switch 29a is operated, the digital data output from the detection LSI 32 is stored in the audio storage area 28a of the application RAM 28.
Is stored in the character storage area 28b corresponding to.

As described above, the voice and the character transmitted from the broadcasting station are output from the speaker 24 and the LCD panel 34, respectively, and when the switch 29a is operated, the analog voice signal is converted into a digital signal and the application RAM 28 By storing digital character control data and character data in the application RAM 28, both the voice and the character data are read out in synchronization with each other, and the voice is output simultaneously with the display of the character, as described later. Is what you can do.

The font ROM 33 includes an LCD panel 34
Is a ROM for storing character fonts to be displayed on the ROM. When displaying the received character data and the character data stored in the application RAM 28 on the LCD panel 34, the microcomputer 27 reads font data corresponding to the character data from the font ROM 33 and outputs the font data to the LCD driver 35. Display of character data is performed.

Next, the relationship between the transmission timing of audio data and text data and the output timing of audio and the display timing of text data in the multiplex broadcasting apparatus and receiver having the above-described configuration will be described with reference to FIG. .

The audio data transmitted as the main broadcast signal is output from the selection circuit 4 a predetermined time T1 before the predetermined time indicated by the time data. In FIG. 4, the predetermined time T1 is equal to the time T2 + T3 required for the receiver to restore the control data and the character data,
The time T1 can be set arbitrarily by controlling the time until the audio data stored in the buffer 6 is read. The audio data output from the selection circuit 4 is encoded and written into the buffer 6, read out from the buffer 6 at a timing such that it can be transmitted at a predetermined time, decoded into analog audio data, and transmitted.

On the other hand, the character control data and character data transmitted as sub-broadcast signals are transmitted to the antenna 14 before the times T2 and T3 required to restore the data on the receiving side.
Respectively. In this case, the control data and the character data are transmitted a predetermined time T2 + T3 before the predetermined time at which the character data is to be displayed, so that the receiving side restores the control data encoded during the time T2, The character data is restored during T3, and the character data is restored at a predetermined time based on the restored control data on the LCD panel 3.
4 can be displayed.

Thus, the display of the character data indicating the time and the notification by voice are performed at the same timing. Next, when reading out the voice data and character data stored in the application RAM 28, the reproduction switch 29b of the switch input unit 29 is operated. When the reproduction switch 29b is operated, the microcomputer 27
Is a voice storage area 28a of the application RAM 28.
And the character data stored in the character storage area 28b are read out in synchronization with each other, and the voice data is output as sound from the speaker 24 via the D / A converter 30 and the amplifier 23. Is displayed on the LCD panel 34 via the LCD driver 35.

As described above, in the above-described embodiment, the analog voice signal is converted into digital data and stored in the RAM 28, and the digital character data is stored in the RAM 28. It is possible to simultaneously read out and output voice and display characters.

In the above-described embodiment, when a user operates the switch 29, an analog voice signal is converted into digital data and stored in the application RAM 28. However, a voice recognition circuit, voice feature detection processing, etc. By adding, the feature of the audio signal may be detected and the audio signal may be automatically converted to digital data.

Contrary to the embodiment, digital character data is converted into analog data and stored in an analog storage medium. The analog data is converted into digital character data by an A / D converter, and the LCD panel 34 May be displayed.

The present invention can be applied not only to the FM broadcasting described in the embodiment but also to AM broadcasting, television broadcasting, digital communication and the like.

[0029]

According to the present invention, since an analog voice signal is converted into a digital signal and stored in a RAM or the like, voice and character data can be read out and output together. Alternatively, a similar effect can be obtained by converting digital character data into an analog signal and storing it in the storage means.

[Brief description of the drawings]

FIG. 1 is a circuit block diagram of a teletext broadcasting device according to an embodiment of the present invention.

FIG. 2 is a diagram illustrating a configuration of a RAM of the teletext broadcasting apparatus.

FIG. 3 is a circuit block diagram of a receiver.

FIG. 4 is a diagram showing the relationship between the transmission timing of audio data and character data and the output timing of audio and display timing of character data.

[Explanation of symbols]

 21 FM tuner 24 Speaker 26 A / D converter 27 Microcomputer 28 Application RAM 30 D / A converter 34 LCD panel

Claims (3)

[Claims] 1. A text multiplex broadcast receiving apparatus used for a text multiplex broadcast system for multiplexing text data with broadcast radio waves and transmitting the multiplexed text data, receiving means for receiving a main broadcast audio signal and a sub broadcast text data, Analog / digital conversion means for converting an analog voice signal received by the means into digital data; and storage for storing the digital data converted by the analog / digital conversion means and the digital character data received by the reception means. Means; digital / analog conversion means for converting digital data stored in the storage means into analog voice signals; voice output means for outputting voice signals converted by the digital / analog conversion means as voice; Display means for displaying character data stored in the storage means. Teletext receiver characterized and. 2. The teletext receiving apparatus according to claim 1, wherein an audio signal is identified from the signals received by said receiving means, and the audio signal identified by said analog / digital conversion means is converted into digital data. A text multiplex broadcast receiving apparatus, further comprising an instruction means for instructing the text multiplex broadcasting. 3. A text multiplex broadcast receiving apparatus used in a text multiplex broadcasting system for multiplexing text data with broadcast radio waves and transmitting the multiplexed text data, receiving means for receiving a main broadcast audio signal and a sub broadcast text data, Digital / analog converting means for converting the digital character data received by the means into analog data; and storage for storing the analog data converted by the digital / analog converting means and the analog voice signal received by the receiving means. Means; analog / digital conversion means for converting analog character data stored in the storage means into digital data; display means for displaying the character data converted by the analog / digital conversion means; Audio output means for outputting the read audio signal as audio Teletext receiving apparatus characterized.