JP2002290845A - Digital broadcast program information processor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make effective signal level adjustments of a video signal and an audio signal. SOLUTION: Audio signals of respective series are divided by an X input voice word division part 18-1 and a Y input voice word division part 18-2 into subwords of (p) bits specified within the prescribed number of bits. A subtracter 41 subtracts a program raw material signal of a Y series from a program raw material signal of an X series having the subwords superposed, a multiplier 42 multiplies the subtraction output by a control coefficient determined according to a switching signal, and the result is passed through a filter 43 to find first reference values regarding the respective subwords and an adder 44 adds those first reference values and second reference values regarding the subwords of an audio signal of the Y series outputted from a delay compensator 46. Then a voice word reconstitution part 18-4 multiplies the addition value of an adder 44 by a digit muliplier determined according to the subwords to find third reference values regarding the subwords and the sum of the third reference values is found.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital broadcast program transmission system, and more particularly to a technique for controlling switching between two systems of video signals and audio signals.

[0002]

2. Description of the Related Art Conventionally, in broadcast transmission equipment, signal processing such as switching, synchronization, and multiplexing of a program information signal to be broadcast has been performed. Here, at the time of program switching or replacement of temporary information, the signal level of the program information signal as the switching source is gradually lowered and the signal level of the program information signal as the switching destination is gradually increased. Level adjustment is required. Therefore, a signal level adjusting circuit such as a fading amplifier (FA) circuit is used.

In the conventional analog broadcast transmission equipment, signal processing is performed by separate signal systems for the video signal system and the audio signal system. Therefore, it is sufficient to provide a dedicated FA circuit for each system. Met.

[0004] However, in a broadcast transmission facility for digital broadcasting, since an audio signal is superimposed on a video signal to perform signal processing, an FA circuit cannot be provided in each system as in analog broadcasting. In addition to the circuit, it is necessary to provide a signal separation circuit for separating the video signal and the audio signal. For this reason, there is a problem that the configuration of the system becomes large and the investment burden on the equipment increases.

[0005]

As described above, in the broadcast transmission equipment for digital broadcasting, an audio signal is superimposed on a video signal to perform signal processing, so that analog broadcasting technology cannot be applied as it is. Further, since a signal separating circuit for separating the video signal and the audio signal is required, the configuration of the system becomes large and the cost is increased.

SUMMARY OF THE INVENTION An object of the present invention is to provide a digital broadcast program information signal in which an audio signal is superimposed on a video signal without signal level adjustment according to program switching or information replacement without separating the video signal and the audio signal. It is an object of the present invention to provide a digital broadcast program information processing apparatus which can perform the processing and can reduce the cost of the system.

[0007]

According to a first aspect of the present invention, there is provided a digital broadcast program information signal in which a second material information signal having a prescribed number of bits is superimposed on a first material information signal.
The present invention is directed to a digital broadcast program information processing apparatus that performs a fading process according to a system switching signal and then selectively derives one of the signals as a transmission signal.

In order to achieve the above object, a second material information signal is provided from each program and extracted from the program information signal, and the second material information signals are mutually specified within a specified number of bits. (P is a natural number) a first signal dividing unit and a second signal dividing unit for dividing into a plurality of blocks having bits and superimposing on the program information signal, and a second signal from an output of the first signal dividing unit. Subtraction means for subtracting the output of the division means, first reference value generation means for calculating a first reference value for each of the plurality of blocks by multiplying the output of the subtraction means by a coefficient determined according to the system switching signal, A second reference value generator for calculating a second reference value for each of the plurality of blocks from an output of the second signal divider, an output of the first reference value generator, and an output of the second reference value generator. To generate the transmission signal And sending signal generating means for, in which as and a material information reconstructing means for reconstructing the second material information signal from the addition output by the sending signal generating means.

The material information reconstructing means multiplies an addition value for each of the plurality of blocks output from the transmission signal generating means by a digit multiplier determined in accordance with the block, to obtain a third reference for each of the plurality of blocks. After calculating the values, the second material information signal is reconstructed by calculating the sum of these third reference values.

Further, when the first material information signal is a video signal having a predetermined number of lines, the second material information signal is an audio signal superimposed on each line of the video signal.

In the first invention, the audio signal in the program information signal of each system is divided into a plurality of p-bit blocks specified within a prescribed number of bits, and the program information signal of the first system is Subtracting the program information signal of the second system, multiplying the subtracted output by a coefficient determined according to the system switching signal to obtain a first reference value for each of the plurality of blocks;
The first reference value and the second reference values for each of the plurality of blocks obtained from the program information signal of the second system are added, and the added output is clearly connected before and after the switching to obtain information. A video signal that does not cause disturbance is generated. Then, a third reference value for each of the plurality of blocks is obtained by multiplying an addition value of the first reference value and the second reference value for each of the plurality of blocks by a digit multiplier determined according to the block. By calculating the sum, an audio signal having the original bit configuration is generated.

Therefore, one signal level adjusting circuit can be shared between the video signal and the audio signal, and the video signal and the audio signal can be separated by simply inputting the program information signal on which the video signal and the audio signal are superimposed. Signal processing can be realized. Therefore, the system configuration can be simplified, and the cost can be reduced and the reliability can be improved.

Further, in the second invention, in the above object, invalid data generating means for generating invalid data, and a program information signal and an output of the invalid data generating means are alternately switched to the first and second systems. An input switching means for outputting, and a p (p is a natural number) which is provided in the first system, extracts a second material information signal from the program information signal, and specifies the second material information signal within a specified number of bits. A) first signal dividing means for dividing into a plurality of blocks having bits and superimposing on the program information signal, and a second material information signal provided from a second system for extracting a second material information signal from the program information signal; A second signal dividing unit for dividing the two material information signals into a plurality of blocks having p (p is a natural number) bits specified within a prescribed number of bits and superimposing the blocks on the program information signal; Output of means Subtracting means for subtracting the output of the second signal dividing means; and first calculating the first reference value for each of the plurality of blocks by multiplying the output of the subtracting means by a first coefficient determined according to the system switching signal. Reference value generation means, second reference value generation means for calculating a second reference value for each of the plurality of blocks from the output of the second signal division means, output of the first reference value generation means, and second reference value generation Transmission signal generation means for generating a transmission signal by adding the output of the transmission means, material information reconfiguration means for reconstructing a second material information signal from the added output of the transmission signal generation means, Switching control means for inputting the program information signal to the previous system and switching the input switching means so as to input the output data generated by the invalid data generating means to the switching source system.

In the second invention, at the time of operation of the first system, a program information signal is input to the first system, and invalid data such as blackness or silence is input to the second system.
When switching to the second system, the program information signal is input to the second system and invalid data is input to the first system.

Therefore, in addition to the same operation and effect as the first aspect, the fading processing operation can be continued without being affected by other systems.

Further, in the second invention, when a signal level adjusting device for automatically adjusting the signal level of the second material information signal to a predetermined level is further provided,
First switching means for selectively deriving respective second material information signals extracted from the program information signals of the first and second systems to the signal level adjusting device; Correction coefficient generation means for generating a first correction coefficient corresponding to the program information signal of the second system and a second correction coefficient corresponding to the program information signal of the second system, and a second correction coefficient generated by the correction coefficient generation means. A second switching means for selectively deriving a first correction coefficient and a second correction coefficient;
A second correction coefficient determined according to the system switching signal and one of the first correction coefficient and the second correction coefficient output by the switching means, and a first correction value to be given to the first reference value generation means. It is characterized by comprising a coefficient generating means for generating a coefficient, and a control means for switching the first and second switching means so as to select a switching destination system when a system switching signal is input.

In this configuration, in order to maintain the level of the input audio signal at a constant level, the audio signal on the operation system side is input to the signal level adjustment device, and the output of the signal level adjustment device is used to correspond to the operation system. By generating a correction coefficient to be added to the coefficient of the multiplier for generating the first reference value, it is possible to control the level of the output audio signal to be constant. However, when fading processing such as system switching or temporary information replacement is required, if the signal level is automatically adjusted to a constant level by the signal level adjusting device, the transmitted signal will be adversely affected. ,
In the control by the signal level adjusting device, it is necessary to limit the operation period to only the steady period in which the switching of the program information signal and the fading process are not performed. Therefore, in the stationary period, if the program information signal is input to the operation system and invalid data is input to the other systems, the signal level control is performed only on the audio signal in the program information signal on the operation system side. It becomes possible.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Some embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a block diagram showing a main configuration of a system in a digital broadcasting station provided with the digital broadcast program information processing apparatus of the present invention.

As shown in FIG. 1, the system includes a switcher (SW) 11 and a program material transmission control device (AP).
C) 12, a video encoder (video ENC) 13, an audio encoder (audio ENC) 14, a multiplexer (MUX) 15, a multiplex control device (SCS) 16, a data server (DS) 17, An amplifier (FA) 18 is provided.

The switcher 11 selectively outputs various program material signals.

The program material transmission control device 12 controls the switcher 11 and the fading amplifier 18 based on the program data provided from the data server 17.

The video encoder 13 has a fader
The video signal output from the amplifier 18 is subjected to variable-length compression encoding based on the MPEG2 encoding method, and is converted into an MPEG2 transport stream packet.

The audio encoder 14 has a fading
The audio signal output from the amplifier 18 is subjected to variable-length compression encoding based on the MPEG2 encoding method, and is converted into an MPEG2 transport stream packet.

The multiplexer 15 is provided for each encoder 1
Various control data are packet-multiplexed with the output packets 3 and 14 and transmitted as a digital broadcast TS.

The multiplex control device 16 controls the multiplexer 15 based on the program data from the data server 17.

(First Embodiment) This embodiment is similar to FIG.
In the fading amplifier 18 in FIG.

FIG. 2 is a block diagram showing a specific configuration of the fading amplifier 18 as the first embodiment of the digital broadcast program information processing apparatus according to the present invention.

The fading amplifier 18 includes an X-input audio word division unit 18-1, a Y-input audio word division unit 18-2, a video FA processing unit 18-3, and an audio word reconstruction unit 18-. 4, a voice extraction / superposition processing unit 18-
5, 18-6. Among them, the audio extraction / superimposition processing section 18-5 has a buffer for outputting and holding the X-system program material signal for a predetermined time, and extracts the audio signal from the program material signal held in the buffer to extract the X signal. It is supplied to the input audio word division unit 18-1, and the output from the X input audio word division unit 18-1 is superimposed on the program material signal held in the buffer and output to the video FA processing unit 18-3.

The audio extraction / superimposition processing section 18-6 has a buffer for outputting and holding a Y-system program material signal for a predetermined period of time. The audio signal is extracted from the program material signal held in the buffer to extract the Y signal. It is supplied to the input audio word division unit 18-2, and the output from the Y input audio word division unit 18-2 is superimposed on the program material signal held in the buffer and output to the video FA processing unit 18-3.

The X-input audio word division unit 18-1 converts the X-system audio signal output from the audio extraction / superposition processing unit 18-5 by the audio separation / subword division circuit 21.
The data is divided into n (n is a natural number) subwords of p (p is a natural number) bits, converted into serial data by the subword serialization circuit 22, and then output to the audio extraction / superposition processing unit 18-5.

The Y-input speech word dividing section 18-2 is similar to the X-input speech word dividing section 18-1 in that it extracts and extracts speech.
The Y-system audio signal output from the superposition processing unit 18-6 is divided into a plurality of p-bit subwords by an audio separation / subword division circuit 31 and converted into serial data by a subword serialization circuit 32. Extraction
Output to superimposition processing section 18-6.

The video FA processing section 18-3 includes a subtractor 41
, A multiplier 42, a filter 43, an adder 44, a filter 45, and a delay compensator 46.

The subtractor 41 subtracts the Y-system program material signal from the X-system program material signal, and outputs the subtracted value to the multiplier 4.
Output to 2. The multiplier 42 multiplies the output value of the subtracter 41 by a control coefficient and outputs the result to the filter 43. Filter 4
3 generates first reference values for each of the n subwords by passing a value of the decimal point or more from the output value of the multiplier 42, and outputs the first reference values to the adder 44. The adder 44 adds the first reference value and the second reference value output from the delay compensator 46, and outputs the added value to the filter 45 and the speech word reconstruction unit 18-4. Filter 4
5 generates a transmission signal by passing only the value of the decimal point or more from the output value of the adder 44, and
Output to

The delay compensator 46 receives the Y-system program material signal and delays the input signal by a delay time corresponding to the total processing time of the subtractor 41, the multiplier 42 and the filter 43, thereby obtaining the second reference value. Is generated and output to the adder 44.

The audio word reconstructing section 18-4 extracts only audio subwords from the output value of the adder 44 by the audio section gating circuit 51,
After being parallelized by the product-sum operation circuit 53,
The parallelized n sub-words are multiplied by a digit multiplier determined according to the sub-words to calculate third reference values for each of the n sub-words, and the sum of these third reference values is obtained to obtain the original bit-structured audio signal. Is reconstructed and output to the audio encoder 14.

Next, the operation of the fading amplifier 18 configured as described above will be described. Here,
As shown in FIG. 3A, the AES is applied to each line of the video signal.
The operation will be described assuming that a program material signal on which a 16-24 bit audio signal according to the / EBU standard is superimposed.

The X-system program material signal and the Y-system program material signal output from the switcher 11 are
An audio signal is extracted by the input audio word division unit 18-1 and the Y input audio word division unit 18-2, and FIG.
After being divided into p-bit n subwords as shown in
This output signal is again superimposed on the program material signal, and
1, respectively.

In the subtracter 41, the Y-system program material signal is subtracted from the X-system program material signal, and the subtracted value is given to the multiplier 42. In the multiplier 42, the subtraction value is multiplied by a control coefficient k given by the program material transmission control device 12. This control coefficient k is varied in the range of 0 to 1,
For the program material signal to be ended, the signal level is set to be gradually attenuated from 1 to 0, and for the program material signal to be started, the signal level is set to be gradually increased from 0 to 1.

The output value of the multiplier 42 is applied to a filter 43
To generate a first reference value for each of the n sub-words and input to the adder 44. The adder 44 adds the input first reference value and the second reference value obtained by delaying the Y-system program material signal by the delay compensator 46 so as to eliminate the time difference from the first reference value.
This addition value is generated as a video signal by passing through the filter 45. This video signal satisfies the following relationship. kx + (1-k) y = k (xy) + y Note that x indicates an X-system program material signal, and y indicates a Y-system program material signal.

On the other hand, from the output value of the adder 44, only the audio subwords are extracted by the audio section gate circuit 51 of the audio word reconstruction section 18-4, and these subwords are parallelized by the subword parallelizing circuit 52. Thereafter, it is input to the product-sum operation circuit 53. The product-sum operation circuit 53 multiplies each of the input n sub-words by a digit multiplier determined according to the sub-word to calculate a third reference value for each of the n sub-words, and obtains the sum of these third reference values. As a result, an audio signal having the original bit configuration is generated.

That is, the output of the speech word reconstruction unit 18-4 is as follows. Aout = kS1 + k2pS2 +... + K2npSn = (S1 + 2pS2 +... + 2npSn) .k = Ain.k Note that k.S1, k.2p.S2,... K.2np.Sn
Is the third reference value for each of the subwords.

As described above, in the first embodiment, the audio signal in the program material signal of each system is divided into the specified number of bits by the X-input audio-word division unit 18-1 and the Y-input audio-word division unit 18-2. Is divided into the p-bit n sub-words specified in the above. Then, the Y-system program material signal is subtracted from the X-system program material signal by a subtractor 41, and the subtracted output is multiplied by a multiplier 42 by a control coefficient determined according to a system switching signal, and passed through a filter 43. A first reference value for each of the n subwords is obtained, and the first reference value and a second reference value for each of the n subwords obtained from the Y-system program material signal by the delay compensator 46 are added by the adder 44. By passing through the filter 45, a video signal is generated that is beautifully connected before and after switching, and does not cause disturbance in information. Subsequently, the audio word reconstruction unit 18-4 obtains third reference values for each of a plurality of subwords obtained by multiplying the addition value of the adder 44 by a digit multiplier determined according to the subword, and sums up the third reference values. By calculating, an audio signal having the original bit configuration is generated.

Therefore, one fading amplifier 18 can be shared by the video signal and the audio signal, and the program material signal on which the video signal and the audio signal are superimposed is input to the fading amplifier 18 as it is. In addition, the video and the audio can be faded separately. Therefore, the system configuration can be simplified, and the cost can be reduced and the reliability can be improved.

In the first embodiment, since the video and the audio are processed in different periods, the control coefficient k is also changed in each of the video and audio periods as shown in FIG. It is also possible to switch and set and control different coefficients in a time-division manner.

(Second Embodiment) This embodiment is similar to FIG.
In the fading amplifier 18 in FIG.

FIG. 4 is a block diagram showing a specific configuration of the fading amplifier 18 according to the second embodiment. In FIG. 4, the same portions as those in FIG. 2 are denoted by the same reference numerals, and detailed description thereof will be omitted.

That is, the fading amplifier 18 according to the second embodiment includes an invalid data generator 61,
Input switches 62 and 63 and an automatic level controller (AL
C) 64, switch 65, inverting circuit 66, switch 6
7, switching controllers 68 and 69, and an adder 70.

The invalid data generator 61 generates invalid data such as blackness or silence.

The input switch 62 selectively derives the program material signal output from the switcher 11 and the invalid data output from the invalid data generator 61 to the X system.

The input switch 63 selectively derives the program material signal output from the switcher 11 and the invalid data output from the invalid data generator 61 to the Y system.

The automatic level control device 64 automatically adjusts the signal level of the audio signal so as to maintain the signal level at a constant level.

The switch 65 includes a voice extraction / superposition processing unit 18
The X-level audio signal output from -5 and the Y-type audio signal output from the audio extraction / superposition processing unit 18-6 are selectively derived to the automatic level control device 64.

The inverting circuit 66 includes an automatic level control device 64
Generates an inverted value of the correction coefficient obtained by

The switch 67 selectively derives the output of the automatic level controller 64 and the output of the inverting circuit 66.

The switching controller 68 includes input switching units 62 and 63
Is controlled in accordance with a switching signal provided from the program material transmission control device 12.

The switching controller 69 performs switching control of the connection between the switching units 65 and 67 in accordance with a switching signal given from the program material transmission control unit 12.

The adder 70 adds the correction coefficient derived by the switch 67 and the fader control coefficient given from the program material transmission control device 12, and gives the added value to the multiplier 42.

Next, the operation of the fading amplifier 18 configured as described above will be described. The level of the audio signal input to the fading amplifier 18 is not always constant due to various deviations that occur during the production or transmission stage. On the other hand, when transmitting as a broadcast program, since it is required that the amplitude does not exceed a certain allowable amplitude,
In the output of the broadcast transmission equipment, the automatic level control device 6
4 will be used. This automatic level control device 6
Reference numeral 4 denotes a device which constantly measures the signal level and controls the signal level so as to keep the amplitude constant.

Therefore, in the second embodiment, the correction coefficient obtained by the automatic level control device 64 is added to the control coefficient given to the multiplier 42 by the adder 70, so that the level of the output sound is kept at a certain level. Can be controlled. However, in this case, it is necessary to limit the operation period to only a steady period that requires a constant audio amplitude without switching or fading processing of the program material signal. This can be realized by adding control to the circuit operation mode according to the program operation program from the program material transmission control device 12.

That is, in the stationary period, the connection of the input switches 62 and 63 is set to one of SW1 = A, SW2 = D or SW1 = B, SW2 = C. k = 1 is set, and in the latter case, k = 0 is set. In the former case, the connection of the switch 65 is set to SW3 = E, and the connection of the switch 67 is set to SW4 = G. This allows
A correction coefficient -k1 is obtained from the output of the automatic level control device 64, and the correction coefficient -k1 is added to the fader coefficient k = 1 by the adder 70. As a result, the result becomes 1-k1, and the X-system audio signal is obtained. Is controlled. On the other hand, for the Y-system input, a level corresponding to k1 is generated.
Since the output of No. 1 is selected, it is not actually output.

Accordingly, only the X-system audio signal is signal-level controlled by the automatic level controller 64. Even when the connection of the input switch 63 is set to SW2 = C, the signal level of only the Y-system audio signal is controlled by the automatic level control device 64 according to the same procedure as described above.

As described above, in the second embodiment, when the automatic level control device 64 is provided, the audio signal on the operating system side is input to the automatic level control device 64 by the switch 65, and the automatic level control device 64 Inverting circuit 6 from the output of
6 and a switch 67 are used to generate a correction coefficient corresponding to the operating system and to add the correction coefficient to the control coefficient to be applied to the multiplier 42 so that the level of the output audio signal is controlled to be constant. At the same time, when the X system is operated, a program material signal is input to the X system, invalid data such as blackness or silence is input to the Y system, and a program material signal is input to the Y system when switching to the Y system. Then, the input switches 62 and 63 are switched to input invalid data to the X system.

Therefore, the signal level control by the automatic level control device 64 can be performed only on the audio signal in the program material signal on the operating system side without being affected by other systems.

In the second embodiment, the use of the automatic level control device 64 makes it possible to always maintain a constant signal level for the audio signal on the operating system side, As a result, a highly reliable system can be realized.

(Other Embodiments) The present invention is not limited to the above embodiments. For example, in the first embodiment, the invalid data generator 61, the input switches 62 and 63, and the switching controller 68 provided in the second embodiment may be provided. In this case, X
During system operation, a program material signal is input to the X system, invalid data such as blackness or silence is input to the Y system, and when switching to the Y system, a program material signal is input to the Y system and the X system is input. The input switches 62 and 63 may be switched so as to input invalid data to the input device.

In this way, the fading processing operation can be continued without being affected by other systems.

In each of the above embodiments, an example has been described in which a program material signal in which a video signal and an audio signal are superimposed is handled. For example, a program material signal in which a video signal and a data signal are superimposed, and an audio signal and a data signal are superimposed. Of course, the present invention can be implemented even when the program material signal is handled.

In addition, the system configuration, fading,
The configuration of the amplifier, the types of video signals and audio signals to be handled, and the like can be variously modified without departing from the scope of the present invention.

[0070]

As described in detail above, according to the present invention,
A digital broadcast program information signal in which an audio signal is superimposed on a video signal can perform signal level adjustment according to program switching and information replacement without separating into a video signal and an audio signal. It is possible to provide a digital broadcast program information processing device capable of reducing costs.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a main configuration of a system in a digital broadcasting station provided with a digital broadcast program information processing device of the present invention.

FIG. 2 is a block diagram showing a specific configuration of a fading amplifier as a first embodiment of the digital broadcast program information processing apparatus according to the present invention.

FIG. 3 is a view for explaining a processing operation of the fading amplifier shown in FIG. 2;

FIG. 4 is a block diagram showing a specific configuration of a fading amplifier as a digital broadcast program information processing apparatus according to a second embodiment of the present invention.

[Explanation of symbols]

 11: switcher (SW), 12: program material transmission control device (APC), 13: video encoder (video ENC), 14: audio encoder (audio ENC), 15: multiplexer (MUX), 16: multiplex control device (SCS) 17) Data server (DS) 18 Fading amplifier (FA) 18-1 X input audio word division unit 18-2 Y input audio word division unit 18-3 FA processing for video , 18-4: voice word reconstruction unit, 18-5: voice extraction / superposition processing unit, 18-6: voice extraction / superposition processing unit, 21, 31: voice separation / subword division circuit, 22, 32: subword Serialization circuit, 41: subtractor, 42: multiplier, 43, 45: filter, 44: adder, 46: delay compensator, 51: audio gate circuit, 52: sub word Parallel processing circuit, 53: product-sum operation circuit, 61: invalid data generator, 62, 63: input switch, 64: automatic level control device (ALC), 65, 67: switch, 66: inverting circuit, 68 , 69: switching controller, 70: adder.

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Susumu Yamaguchi 3-3-1 Shinmachi, Ome-shi, Tokyo Toshiba Digital Media Engineering Co., Ltd. In-house F-term (reference) 5C025 AA08 AA09 AA10 DA01

Claims (5)

[Claims] 1. A two-system digital broadcast program information signal in which a second material information signal having a prescribed number of bits is superimposed on a first material information signal is input, and fading processing is performed according to a switching signal. Then, in a digital broadcast program information processing apparatus that selectively derives one signal as a transmission signal, the digital broadcast program information processing apparatus is provided in each system and extracts the second material information signal from the program information signal. A first signal dividing unit and a second signal dividing unit for dividing a signal into a plurality of blocks having p (p is a natural number) bits specified within a prescribed number of bits and superimposing the blocks on the program information signal; Subtracting means for subtracting the output of the second signal dividing means from the output of the first signal dividing means; and multiplying the output of the subtracting means by a coefficient determined in accordance with the switching signal to each of the plurality of blocks. The first about
First reference value generation means for calculating a reference value; second reference value generation means for calculating a second reference value for each of the plurality of blocks from an output of the second signal division means; and the first reference value Transmission signal generation means for adding the output of the generation means and the output of the second reference value generation means to generate the transmission signal; and reconstructing the second material information signal from the added output by the transmission signal generation means A digital broadcast program information processing apparatus comprising: 2. A two-system digital broadcast program information signal in which a second material information signal having a prescribed number of bits is superimposed on a first material information signal is input, and fading processing is performed according to a switching signal. Then, in a digital broadcast program information processing device for selectively deriving one of the signals as a transmission signal, an invalid data generating means for generating invalid data; and a program information signal and an output of the invalid data generating means, And input switching means for alternately switching and outputting to the second system, provided in the first system, extracting the second material information signal from the program information signal, and combining the second material information signal with each other. A first signal dividing means for dividing into a plurality of blocks having p (p is a natural number) bits specified within a prescribed number of bits and superimposing the blocks on the program information signal; Extracting the second material information signal from the program information signal, dividing the second material information signal into a plurality of blocks having p (p is a natural number) bits specified within a specified number of bits, and A second signal dividing unit that superimposes on a signal; a subtracting unit that subtracts an output of the second signal dividing unit from an output of the first signal dividing unit; The first to be determined
A first reference value generating means for calculating a first reference value for each of the plurality of blocks by multiplying a coefficient of Second reference value generation means for calculating; transmission signal generation means for adding the output of the first reference value generation means and the output of the second reference value generation means to generate the transmission signal; A material information reconstructing means for reconstructing the second material information signal from the addition output by the means; and a program information signal input to a system to be switched to when the system is switched,
A digital broadcast program information processing apparatus, comprising: switching control means for switching the input switching means so as to input output data generated by the invalid data generating means to a switching source system. 3. The apparatus according to claim 1, further comprising a signal level adjusting device for automatically adjusting a signal level of the program information signal to a predetermined level, wherein each of the signal levels is extracted from the first and second system program information signals. A first switching means for selectively deriving a second material information signal of the first level to the signal level adjusting device; and a second switch corresponding to the second material information signal of the first system from an output of the signal level adjusting device. Correction coefficient generation means for generating a first correction coefficient and a second correction coefficient corresponding to the second material information signal of the second system; and a first correction coefficient and a second correction coefficient generated by the correction coefficient generation means. A second switching means for selectively deriving a second correction coefficient, and one of the first correction coefficient and the second correction coefficient output by the second switching means and the switching signal, the second correction coefficient being determined in accordance with the switching signal. The second coefficient A coefficient generating means for calculating a first coefficient to be given to the first reference value generating means, and when the switching signal is inputted, selecting the first and second switching means to select a switching system. 3. The digital broadcast program information processing apparatus according to claim 2, further comprising: control means for performing switching. 4. The material information reconstructing means multiplies an addition value for each of the plurality of blocks output from the transmission signal generating means by a digit multiplier determined according to the block, and outputs each of the plurality of blocks. Third about
3. The digital broadcast program information processing apparatus according to claim 1, wherein the second material information signal is reconstructed by calculating a sum of the third reference values after calculating the reference values. 5. When the first material information signal is a video signal having a predetermined number of lines, the second material information signal is:
The digital broadcast program information processing apparatus according to claim 1, wherein the digital broadcast program information processing apparatus is an audio signal superimposed on each line of the video signal.