JP2002158623A - Bit-error rate confirming device for receiver for digital radio transmission system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an error rate confirming device for a receiver for a digital radio transmission system, where it is not always required for a supervisor to monitor a bit-error rate displayed on the receiver in digital radio transmission of image data. SOLUTION: This invention provides the device 10 for confirming the bit-error rate of a received signal, that is provided to a digital radio transmission system receiver 20 for image data transmission and the device 10 has a means that informs the supervisor in sound about transmission quality to which the bit-error rate relates. The sound notice means may be a means that changes a sound generating interval, corresponding to increase/decrease in the bit-error rate, changes an echoic sound corresponding to the bit-error rate, or changes a sound frequency, corresponding to the increase/decrease in the bit error rate, or may be by configured so as to be operated only when the bit-error rate exceeds a prescribed rate.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital radio transmission technology, and more particularly, to an FPU (Field Pick-Up Uni) for performing television relay broadcasting.
At t), the present invention relates to a technique for grasping a bit error situation of a received signal.

[0002]

2. Description of the Related Art In recent years, a digital radio transmission system has been adopted in television relay broadcasting instead of an analog radio transmission system, and it has become possible to produce a relay program with high quality video. For example, digital F used for digital wireless transmission
PUs mainly use OFDM (Ortho) in the 800 MHz band.
gonal Frequency DivisionM
By using a digital modulation wave such as multiplexing (orthogonal frequency division multiplexing) and transmitting a signal multiplexed with compressed data such as an MPEG2 codec, a limited frequency band can be effectively utilized.

In digital wireless transmission, bit errors may occur in digital signals received by a receiver such as a digital FPU receiver due to propagation conditions that change from moment to moment. However, one of the features of the digital wireless transmission system is that even if there is a bit error, the signal can be correctly received within the correction limit and the received image is not affected.

However, once demodulation breaks down beyond the bit error correction limit of the received signal, the effect becomes very large, and an image reproduced from the received signal cannot be used as an image at all. In order to avoid falling into such a situation that the received image cannot be used, in the analog wireless transmission system, the signal meter on the receiver checks the electric field strength of the received signal. It is indispensable to check not only the electric field strength but also the bit error rate. Therefore, the bit error rate is displayed on the receiver with an LED or the like to check it.If the bit error rate increases during signal reception, the direction of the receiving antenna is adjusted to correct the reception state, The reception is performed with a low bit error rate.

[0005]

However, regarding monitoring of the bit error rate in a receiver such as a conventional digital FPU receiver, the bit error rate is only displayed on the receiver, and therefore, before the start of the main relay. When adjusting the direction by moving the antenna up, down, left and right during
It was necessary for the person to frequently check the bit error rate display on the receiver or to read the display sequentially. Also, in the actual relay operation after the start of the main relay, it is necessary to constantly monitor that the bit error rate is within the correction limit while watching the display of the bit error rate even during the main relay. In addition, when there is an interruption of an obstacle between a heavy rainfall and a transmission / reception point, particularly in a marathon relay, when receiving a radio wave transmitted from a mobile relay van, the bit error rate may frequently change, It was necessary to constantly monitor the bit error rate.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems. In a digital wireless transmission for image data transmission, which needs to monitor the bit error rate of a received signal and the electric field strength separately, the present invention is applied to a receiver. It is an object of the present invention to provide a digital radio transmission system receiver error rate checking device which does not need to constantly monitor the bit error rate displayed in the receiver.

[0007]

SUMMARY OF THE INVENTION The present invention is an apparatus for confirming the bit error rate of a received signal provided in a digital radio transmission system receiver for image data transmission, wherein the bit error rate is related to the apparatus. A means for notifying the transmission quality by sound is provided.

Further, the means for notifying by sound corresponds to a change in a sound generation interval corresponding to the increase or decrease in the bit error rate, a change in an onomatopoeic sound corresponding to the bit error rate, or an increase or decrease in the bit error rate. Means for operating any of the changes in the frequency of the sound, and the means for notifying by the sound may be configured to operate only when the bit error rate exceeds a predetermined value. Well, further, the means for notifying by sound is configured to operate by increasing or decreasing the bit error rate;
There may be provided a means for selecting a configuration that operates only when a predetermined value is exceeded.

[0009] The digital radio transmission system receiver may include a high-frequency unit and a control unit, and may include a unit that emits a sound to the high-frequency unit via a unit that notifies the user of the sound.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram of a circuit configuration showing an embodiment of a bit error rate confirmation device for a digital FPU receiver according to the present invention. FIG. 2 is a block diagram showing a circuit configuration of a first embodiment of the bit error rate checking device of the digital FPU receiver shown in FIG. FIG. 3 is a block diagram showing a circuit configuration of a second embodiment of the bit error rate checking device of the digital FPU receiver shown in FIG. FIG. 4 is an explanatory diagram of a sound generation interval that changes in accordance with an increase or a decrease in the bit error rate in the bit error rate confirmation device of the digital FPU receiver shown in FIG. FIG. 5 shows the digital F shown in FIG.
FIG. 7 is an explanatory diagram of a unit that emits a warning sound only when a predetermined bit error rate is exceeded in a bit error rate confirmation device of a PU receiver. FIG. 6 is an explanatory diagram of an audio frequency that changes in response to an increase or a decrease in the bit error rate in the bit error rate confirmation device of the digital FPU receiver shown in FIG.

As shown in FIG. 1, a bit error rate checking device (hereinafter referred to as a bit error checking device 10) of a digital FPU receiver which is a receiver for a digital wireless transmission system according to an embodiment of the present invention is a digital FPU receiver. 20 IFs (Inte
rmediate Frequency: intermediate frequency)
This device includes means for notifying, by voice, the transmission quality related to the bit error rate of the received signal by a signal from the amplifier 26 or a signal from the digital demodulation circuit 33. still,
The digital FPU receiver 20 described here includes a high-frequency unit 2
1 and a control unit 22, and a coaxial cable 29
It is a configuration of connecting with.

A digital FPU receiver 20 shown in FIG. 1 used in a digital FPU in which a digital modulation wave such as OFDM in the 800 MHz band is used receives a digital modulation wave transmitted from a television relay vehicle or the like by an antenna 23. , An RF (Radio Frequency: radio frequency) amplifier 24 amplifies the received signal and
5, the frequency is converted to an intermediate frequency in the IF amplifier 26, and the signal is amplified to synthesize / divide the signal.
Pass through 8. The combiner / distributor 28 carries a power supply, various control signals, and communication signals on a single coaxial cable 29 by frequency multiplexing in addition to a digital signal (mainly a compressed television signal) received by the antenna 23.
The signal synthesized by the synthesizer / distributor 28 is transmitted to a coaxial cable 29
And sent from the high frequency unit 21 to the control unit 22.
In the control unit 22, the signal synthesized by the synthesis distributor 30 is distributed to a digital signal (mainly a compressed television signal) and a control signal. The distributed digital signal (mainly a compressed television signal) is amplified by the IF amplifier 31 on the control unit 22 side, and the digital demodulation unit 33 demodulates the digital signal (mainly a compressed television signal). And outputs a data output 34.
The data output 34 is input to a codec decoder (decoder) such as MPEG2.

The digital FPU receiver 2 has been described so far.
Although 0 has been described as a configuration in which the high-frequency unit 21 and the control unit 22 are separated from each other, they may be integrated. In this case, the functions relating to the connection of both the components, the combiners / distributors 28 and 30, the coaxial cable 29, the modems 37 and 38,
Further, a configuration without the speaker 40, the transmission quality display unit 39, the IF amplifier 31, and the electrolytic strength display unit 32, which are one of the functions that are duplicated in both the configurations, is also possible.

A signal is sent from the digital demodulation section 33 to the bit error detection section 11 of the bit error rate confirmation device 10, which is a means for notifying the bit error rate by sound, and a bit error is detected. The bit error rate is calculated. Then, the signal of the bit error rate is analyzed in the various audio table sections 12, and a sound or the like corresponding to the means is output from the speaker 13. Also, the bit error detection unit 11
Sends a signal corresponding to the bit error or the bit error rate to the transmission quality display unit 35, and the transmission quality is changed to LE.
D is displayed. The means for notifying by the sound includes a change in the sound generation interval corresponding to the increase or decrease of the bit error rate, a change of the onomatopoeic sound corresponding to the bit error rate, or the frequency of the sound corresponding to the increase or decrease of the bit error rate. It is preferable that the device be configured to operate any of the above-mentioned changes or to be operated only when the bit error rate exceeds a predetermined value. It is preferable to provide a means for selecting a configuration that operates only when the operation is performed.

Of the electric field strength and bit error rate of the received signal, which are indications of the transmission state, the electric field strength has conventionally been measured by the analog meters of the electric field strength display sections 27 and 32 in the high frequency section 21 and the control section 22 shown in FIG. It is grasped by the voice converted by the voltage-voice frequency converter 36.

In the digital FPU receiver 20 provided with the bit error rate confirmation device 10, a conventional transmission quality display 35,
Bit Error Rate Confirmation Device 10 with 39 LED Display
The bit error rate can be ascertained for various types of voices. That is,
The voice generation interval or voice frequency is continuously changed in accordance with the level of the bit error rate, and the operator can adjust the direction of the antenna 23 while listening to the voice.

As described above, the transmission quality related to the bit error rate of the received signal is notified by voice through the speakers 40 and 13 in the high frequency unit 21 and the control unit 22, so that the transmission in the high frequency unit 21 and the control unit 22 is performed. It is not necessary to frequently check the LED display of the quality display sections 39 and 35, and even one person can move the antenna 23 up, down, left and right to adjust the direction. The sound may be a sound such as an oscillating sound.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a bit error rate checking device 10 shown in FIG.
An example will be described.

(Embodiment 1) As shown in FIG. 2, a signal from a digital demodulation unit 33 shown in FIG. 1 is input to a bit error rate confirmation device 50 of a digital FPU receiver according to a first embodiment of the present invention. It comprises a bit error detection section 51, a voice generation interval conversion section 52, a threshold detection voice conversion section 53, an adjustment / operation switch 54, a voice amplification section 55, and a speaker 56.

At the time of adjustment before the start of television relay or the like, the adjustment-operation switch 54 shown in FIG. 2 is switched to the sound generation interval conversion unit 52 side. According to the characteristic shown in FIG. 4, the voice generation interval conversion unit 52 increases the voice generation interval when the bit error rate is low, and shortens the voice generation interval when the bit error rate is high. Note that the bit error rate in the figure is expressed in logarithm. When the bit error rate gradually increases, and when the bit error rate exceeds a certain value, the interval of sound generation is made constant. The sound output signal from the sound generation interval conversion unit 52 is amplified by the sound amplification unit 55, and sound is output from the speaker 56.

The speaker 56 represents the speakers 40 and 13 in the high frequency section 21 and the control section 22 shown in FIG. An audio amplifier 55 is provided to the speaker 40 of the high frequency unit 21.
The amplified sound is transmitted from the modem 37 through the modem 38, so that the speaker 40 in the high frequency unit 21 can hear the same sound.

Thus, the operator of the antenna 23 can operate the antenna 23 while directly listening to the voice. The adjustment-operation switch 54 is a digital FPU
Although it is provided in the control unit 22 of the receiver 20, it may be one that can be switched by control from the high frequency unit 21 by control means (not shown).

After the start of the television relay or the like, the adjustment-operation switch 54 is set to the threshold detection sound conversion unit 53.
Switch to side. According to the characteristic shown in FIG. 5, the threshold detection sound conversion unit 53 issues a warning sound when the bit error rate exceeds the threshold value, and this warning sound output signal is amplified by the sound amplification unit 55 and A beep sounds. Note that the bit error rate in the figure is expressed in logarithm. The interval and frequency of the warning sound are constant. If the bit error rate does not exceed the threshold, no warning sound is emitted.

(Embodiment 2) As shown in FIG. 3, an error rate checking device 6 for a digital FPU receiver according to a second embodiment of the present invention.
0 is a bit error detecting section 61 to which a signal from the digital demodulating section 33 shown in FIG.
2, audio frequency converter 63, threshold detection audio converter 6
4. An adjustment switch 65, an adjustment-operation switch 66, an audio amplifier 67, and a speaker 68.

The speaker 68 represents the speakers 40 and 13 in the high frequency section 21 and the control section 22 shown in FIG. An audio amplifier 67 is provided to the speaker 40 of the high frequency unit 21.
The amplified sound is transmitted from the modem 37 through the modem 38, so that the same sound can be heard by the speaker 40 in the high frequency unit 21.

At the time of adjustment before the start of television relay or the like, the adjustment-operation changeover switch 66 is switched to the adjustment changeover switch 65 side, and the adjustment changeover switch 65 is changed according to the location condition at the time of relaying and the weather condition. Switching to the announcement sound conversion unit 62 side or the sound frequency conversion unit 63 side. still,
Adjustment changeover switch 65 and adjustment-operation changeover switch 66
Are in the control unit 22 of the digital FPU receiver 20, but are controlled by a control unit (not shown).
Switching may also be performed by control from one.

For example, when the transmission side is poor due to heavy rain, fading becomes a problem, and it is necessary to grasp the bit error rate and the electric field strength at the same time. Switch to.
For example, when the bit error rate falls from the threshold value 1 to the threshold value 4 in the announcement sound conversion unit 62, a sound having a bit error value based on a prepared human voice from the sound 1 to the sound 4 is output. This audio output signal is amplified by the audio amplifier 67, and a sound is output from the speaker 68. The bit error rate and the electric field intensity can be simultaneously grasped by using the audio and the display of the electric field intensity display units 27 and 32 in the high frequency unit 21 and the control unit 22 or the voltage-audio frequency conversion unit 36 shown in FIG. Thus, the antenna 23 can be easily adjusted to the optimum direction.

In a place where high-rise buildings are lined up, multipath becomes a problem, and the bit error rate may be extremely high even when the electric field strength is good. In such a case, the adjustment changeover switch 65 shown in FIG. The audio frequency conversion unit 63 increases the audio frequency when the bit error rate is low, according to the characteristics shown in FIG.
When the bit error rate is high, the voice frequency is lowered. still,
The bit error rate in the figure is expressed in logarithm. When the bit error rate gradually increases and exceeds a certain value, the audio frequency is made constant. This audio output signal is amplified by the audio amplifier 67, and a sound is output from the speaker 68. This allows the antenna 23 to focus on the bit error rate.
Direction can be adjusted.

As described above, in the digital FPU receiver according to the embodiment of the present invention, in which it is necessary to monitor the bit error rate of the received signal and the electric field strength separately, the bit error rate, which has not been conventionally provided, is added to the voice. It is not necessary for the observer to always look at the bit error rate displayed on the receiver as in the prior art.

Note that the digital FPU receiver is a digital radio transmission system TSL (Transmitter-S
The receiver may be another digital wireless transmission system receiver for image data wireless transmission such as a video link, etc. In such a case, the bit error rate can be confirmed by voice or the like in the same manner as described above.

[0031]

According to the present invention, there is no need for the observer to constantly watch the bit error rate displayed on the receiver, and the direction of the antenna can be easily adjusted by one person.

[Brief description of the drawings]

FIG. 1 is a circuit configuration block diagram showing an embodiment of a bit error rate confirmation device for a digital FPU receiver according to the present invention.

FIG. 2 is a block diagram showing a circuit configuration of a first embodiment of a bit error rate checking device of the digital FPU receiver shown in FIG. 1;

FIG. 3 is a block diagram showing a circuit configuration of a second embodiment of the bit error rate checking device of the digital FPU receiver shown in FIG. 1;

4 is an explanatory diagram of a sound generation interval that changes according to an increase or a decrease in the bit error rate in the bit error rate confirmation device of the digital FPU receiver illustrated in FIG. 2;

5 is an explanatory diagram of a unit that emits a warning sound only when a predetermined bit error rate is exceeded in the bit error rate confirmation device of the digital FPU receiver illustrated in FIG. 2;

6 is an explanatory diagram of an audio frequency that changes in response to an increase or a decrease in the bit error rate in the bit error rate checking device of the digital FPU receiver illustrated in FIG. 3;

[Explanation of symbols]

 10, 50, 60 bit error rate checking device 11, 51, 61 bit error detection unit 12 various audio table units 13, 40, 56, 68 speaker 20 digital FPU receiver 21 high frequency unit 22 control unit 23 antenna 24 RF amplifier 25 frequency Conversion units 26, 31 IF amplifiers 27, 32 Electric field strength display unit 28, 30 Combining / distributing unit 29 Coaxial cable 33 Digital demodulation unit 34 Data output 35, 39 Transmission quality display unit 36 Voltage-voice frequency conversion unit 37, 38 Modem 52 Voice generation interval conversion unit 53, 64 Threshold detection voice conversion unit 54, 66 Adjustment-operation switch 55, 67 Audio amplification unit 62 Announcement voice conversion unit 63 Voice frequency conversion unit 65 Adjustment changeover switch

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) H04N 17/00 H04N 7/13 A

Claims (5)

[Claims] 1. A device for checking a bit error rate of a received signal provided in a receiver for a digital wireless transmission system for image data transmission, wherein a transmission quality related to the bit error rate is notified by sound. A bit error rate confirmation device for a digital radio transmission system receiver, comprising: 2. The means for notifying by sound corresponds to a change in a sound generation interval corresponding to the increase or decrease in the bit error rate, a change in an onomatopoeic sound corresponding to the bit error rate, or an increase or decrease in the bit error rate. 2. The bit error rate checking device for a digital wireless transmission system receiver according to claim 1, wherein the bit error rate checking device is a means for performing any one of a change of a sound frequency. 3. The digital radio transmission system receiver according to claim 1, wherein said sound notification means is configured to operate only when said bit error rate exceeds a predetermined value. Bit error rate confirmation device. 4. The system according to claim 1, wherein said means for notifying by sound comprises means for selecting between a configuration that operates by increasing or decreasing said bit error rate and a configuration that operates only when the bit error rate exceeds a predetermined value. The bit error rate confirmation device for a digital wireless transmission system receiver according to any one of claims 1 to 3. 5. The digital radio transmission system receiver according to claim 1,
5. The high frequency section according to claim 1, further comprising: a high frequency section and a control section, wherein the high frequency section includes a unit that emits a sound through a unit that notifies the user of the sound. 6. Bit error rate confirmation device for digital wireless transmission system receiver.