KR0172464B1 - Sound information signal transmitter receiver in vertical blanking interval - Google Patents

Abstract

The present invention relates to an apparatus for transmitting and receiving an audio information signal in a vertical blanking section of a composite video signal. The transmitting side compresses and inserts an analog audio information signal in a vertical blanking section of a composite video signal and transmits the analog video signal. By extending the sound information signal to the compression ratio at the transmitting side and restoring the original sound information, it is possible to provide sound information by raising the information providing service of the TV only through the conventional screen.

Description

Audio information signal transmitting and receiving device in the vertical blanking section

1 is a block diagram of an apparatus for transmitting acoustic information signals in a vertical blanking section of a composite video signal according to the present invention.

2 is a block diagram of an acoustic information signal receiving apparatus in a vertical blanking section of a composite video signal according to the present invention.

3 is a waveform diagram showing an embodiment in which an analog audio information signal is decompressed and reconstructed in an audio information signal transmitting and receiving device within a vertical blanking section of a composite video signal according to the present invention.

* Explanation of symbols for main parts of the drawings

11: controller of transmitter 12: A / D converter of transmitter

13 memory of transmitter 14 D / A converter of transmitter

15: Inserter 16: Clock Generator of Transmitter

21: controller of receiving device 22: high pass filter (HPF)

23: A / D converter of the receiver device 24: Memory of the receiver device

25: D / A converter of the receiving device 26: Clock generator of the receiving device

Ⓐ: original analog sound information signal in the embodiment of the present invention

Ⓑ: 5 times compressed analog acoustic information signal in the embodiment of the present invention

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information signal transmission and reception device for transmitting and receiving information in a vertical blanking section of a composite video signal. In particular, the present invention relates to compressing and transmitting an audio information signal in a vertical blanking section and decompressing an audio information signal received at a receiving side. The present invention relates to a sound information signal transmitting and receiving device capable of receiving a sound information service.

As the demand for various information increases rapidly in the information age such as the present day, service information about weather forecasts, stocks, cultural events, etc. is transmitted from broadcasting stations, and users can receive such information through individual TVs. Technology has developed.

Conventional technology used as an information providing service system using a TV is a text multicasting (Teletext), which transmits image information composed of letters or figures as a digital signal using a vertical blanking section of a TV signal. It is a system that receives various service information with TV receiver equipped with multicast adapter or text multicast decoder. The conventional technique of teletext is to decode the image or image signal transmitted from the broadcasting station on the receiving side using a character broadcast decoder and to reproduce the image of the character or figure so that it appears on the screen of the TV receiver. The main focus is on providing information from a visual point of view.

However, in order to provide a more complete and diverse information service, it is also urgently required to provide not only information on conventional visual aspects such as texts and figures but also information on auditory aspects such as voice or sound.

Therefore, in order to meet this demand, the present invention can transmit and insert a signal of the audio information service in the vertical blanking section of the composite video signal of the TV on the transmitting side, and decompress and restore the audio information signal received on the receiving side. By doing so, the level of information service using TV is further enhanced.

In order to achieve this object, the apparatus for transmitting acoustic information in the vertical blanking section of the present invention uses a clock generator to write a digital acoustic information signal to a memory at a frequency of a memory write clock, and a clock generator to use a much larger frequency than a memory write clock. By converting digital sound information from memory to the frequency of memory read clock of frequency and converting it to analog, consequently, the original analog sound information signal is compressed to the ratio of frequency of memory read clock to frequency of memory write clock, and then vertical blanking section of composite video signal. Insert it in and send it. In addition, in the present invention, the sound information receiving apparatus extends the compressed analog sound information through the reverse process from the transmitter and restores the original sound information signal.

Hereinafter, the operation of the apparatus for transmitting and receiving an acoustic information signal in the vertical blanking section of the present invention will be described in detail with reference to the accompanying drawings.

1 shows a transmitting device of an audio information signal transmitting and receiving device in a vertical blanking section of the present invention, wherein the controller 11 for controlling the entire transmitting device by a synchronization signal separated from a composite video signal, and the original analog audio information signal A / D converter 12 for converting to digital signal, memory 13 for storing digital sound information signal until inserted into vertical blanking section of composite video signal according to control signal, and digital sound information signal from memory D / A converter 14 for converting the sound information signal, synthesizer 15 for inserting the analog sound information signal into the vertical blanking section of the composite video signal according to the control signal, and the frequency when the analog sound information signal is read from the memory. A clock generator that generates a memory write clock and a memory read clock to compress the frequency ratio when writing to memory. Contains vitality 16. Here, the sound information signal may include a channel number, a program name, a broadcast time, and the like.

Hereinafter, the specific operation of each component of the apparatus for transmitting sound information in the vertical blanking section of the present invention will be described.

First, the original analog sound information signal to be transmitted by the A / D converter 12 is converted into a digital signal. At this time, the frequency of the sound signal is twice or more than that of the sound signal so as not to lose the information of the analog signal.

The compression of the acoustic information signal for inserting all of the acoustic information signals to be serviced in the vertical blanking section of a limited period of time records the sound information signal into the memory once in order to synthesize the acoustic information signal with the vertical blanking signal of the composite video signal. It is done in the process of reading and reading, and the steps are as follows.

Sound generated by the A / D converter 12 and converted into a digital signal by generating a memory write clock having a sampling frequency (for example, n hertz) of the A / D converter 12 with the clock generator 16. The information signal is recorded in the memory 13. The digital sound information signal recorded in the memory 13 is read from the memory 13 to be inserted into the vertical blanking section of the composite video signal according to the control signal of the controller 11. At this time, the clock generator 16 generates and reads a memory read clock having a frequency much larger than that of the memory write clock (for example, N hertz and Nn), and then converts the analog signal into an analog signal using the D / A converter 14. As a result, the original analog sound information signal becomes an analog sound information signal compressed with the ratio of the frequency of the memory read clock to the frequency of the memory write clock (N / n) with respect to the time axis.

3 shows the compression effect of the analog sound signal in the transmission apparatus in the case of the embodiment of the present invention in which the frequency n of the first clock is 1K hertz and the frequency N of the second clock is 5K hertz. , Ⓐ is the original sound information signal and ⓑ is 5 times compressed sound information signal. In practice, the rate of compression is much greater than in the case of FIG. 3 (N / n = 5).

The synthesizer 15 inserts the compressed sound information signal only within the vertical blanking section of the composite video signal according to the control signal of the controller 11 and transmits the synthesized signal.

2 shows a receiving device of an acoustic information signal transmitting and receiving device in a vertical blanking section according to the present invention. The controller 21 controls the receiving device according to a signal according to a receiver's selection, and the compressed acoustic information signal is inserted into the vertical blanking section. A high pass filter 22 for removing low frequency components from the received composite video signal, an A / D converter 23 for converting an analog sound information signal into a digital sound information signal, and a digital sound information signal. Memory 24 for storing a digital sound information signal, a D / A converter 25 for converting a digital sound information signal into an analog sound information signal, and a memory write clock and a memory to restore the compressed analog sound information signal to the original analog sound information signal. A clock generator 26 for generating a read clock is included.

Hereinafter, the specific operation of each component of the acoustic information receiving apparatus in the vertical blanking section of the present invention will be described.

The high pass filter (HPF) 22 removes low frequency components such as a horizontal synchronous signal from the received composite video signal, and the low frequency component is removed by the controller 21 control signal only in the vertical blanking section of the composite synchronous signal. It is input to the D converter 23.

The process of restoring the original sound information signal is performed in the process of recording the received sound information signal into the memory 24 and reading it from the memory 24 until the time for which the receiver wants to receive the information. The step is performed in reverse of the compression process of the acoustic information signal in the transmitting apparatus as follows.

The clock generator 26 generates a memory write clock having the same frequency as the frequency (N hertz) of the memory read clock of the transmitter, and converts the acoustic information signal converted into a digital signal by the A / D converter 23 to A / D. Write to memory 24 of transducer. The digital sound information signal recorded in the memory 4 is generated by the clock generator 26 to generate a memory read clock having a frequency equal to the frequency n of the memory write clock of the transmitter, and read from the memory. When converted into an analog signal through the converter 25, the analog acoustic information signal compressed and received at the transmitting side is converted to the frequency of the memory write clock of the receiver (= frequency of the memory read clock of the transmitter, N) with respect to the time axis. The analog sound information signal compressed at the rate of N / n at the transmitter is expanded to the frequency of the memory read clock of the transmitter (= frequency at the transmitter's memory write clock, n). The original analog sound information signal is restored to be expanded.

In the signal selector 27, the audio information signal in the vertical blanking section of the composite video signal transmitted from the broadcasting station, that is, the audio information signal recovered from the channel number, program name, broadcast time, etc., and one of the general sound signals carried in the program are displayed. The output is sorted according to the consumer's choice. Accordingly, the user can select and listen to the vertical sound information signal or the general sound signal.

FIG. 3 shows the effect that the analog acoustic information signal at the receiver is extended and restored when the frequency N of the memory write clock of the receiver is 5K hertz and the frequency n of the memory read clock of the receiver is 1K hertz. This is a waveform diagram showing that the receiving device restores ⓑ to ⓐ. In practice, the rate of expansion is much greater than in the case of FIG. 3 (N / n = 5).

As described above, the audio information signal compressed and transmitted in the vertical blanking section and then restored by the receiving device may be selectively output with the general sound signal according to the user's selection, and is a conventional text information transmission / reception system. It may also be provided with).

As described above, the audio information transmitting and receiving apparatus of the present invention compresses the analog audio information signal at the transmitting side, inserts the same into the vertical blanking section of the composite video signal, and transmits the same. By extending the information to the original sound information restored to provide the sound information by raising the information providing service of the TV only through the screen in the prior art.

Claims (9)

An information signal transmitting apparatus for carrying information in a vertical blanking section of a composite video signal, wherein the information signal transmitting device carries an analog sound information signal in a vertical blanking section of the composite video signal. The apparatus of claim 1, wherein the transmitting device controls a transmitting device according to a synchronization signal separated from a composite video signal; And an A / D converter converting the analog sound information signal into a digital signal. And a memory for storing the digital sound information signal; And a D / A converter for converting the digital sound information signal read from the memory into an analog sound information signal according to the control signal. And a synthesizer for inserting the analog sound information signal into the vertical blanking section of the composite video signal according to the control signal. The apparatus of claim 1 or 2, wherein the transmitter comprises a clock generator for generating a memory write clock and a memory read clock. 4. The apparatus of claim 3, wherein the clock generator generates a memory write clock and a memory read clock having a frequency greater than that of the memory write clock to compress the analog sound information signal with respect to the time axis. An information signal receiving apparatus for receiving an information signal in a vertical blanking section of a composite video signal, characterized by receiving an analog sound information signal inserted in a vertical blanking section of the composite video signal. The apparatus of claim 5, wherein the receiving device comprises: a controller controlling the receiving device according to a synchronization signal separated from the composite video signal; And a high pass filter for removing low frequency components from the received composite video signal into which the audio information signal is inserted. And an A / D converter converting the analog sound information signal into a digital signal. And a memory for storing the digital sound information signal; And a D / A converter for converting the digital sound information signal read from the memory into an analog sound information signal according to the control signal. 7. The acoustic information signal receiving apparatus as claimed in claim 5 or 6, wherein the receiving apparatus includes a clock generator for generating a memory write clock and a memory read clock. 8. The sound generator as claimed in claim 7, wherein the clock generator generates a memory write clock and a memory read clock having a frequency smaller than that of the memory write clock in order to expand and restore the analog sound information signal compressed on the time axis. Information signal receiver. The apparatus of claim 5 or 6, wherein the receiver further comprises a signal classifier capable of selectively outputting a sound information signal and a general sound signal in a vertical blanking section of the composite video signal according to a consumer's selection. A sound information signal receiving apparatus.