JPH11289522A - Television data broadcast receiver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the television data broadcast receiver that receives a signal in an excellent way even in the case that the reception state is not excellent and two kinds of signals multiplexed on two subcarriers are respectively received. SOLUTION: The television data broadcast receiver is provided with a selection means 118 that selects a data signal output with a best reception state from data signal outputs extracted by at least two extract means 110-115 or over to extract a data signal multiplexed on a subcarrier of 4.5 fH or a data signal multiplexed on a subcarrier of 7.5 fH from a reception output by at least two reception means 103-109 or over to receive the same television broadcast wave that is broadcast by being multiplexed on 2-channel subcarriers of 4.5 fH and 7.5 fH in a voice band of the television broadcast wave based on a measurement result by measuring means 116, 117 that measure each reception state and with processing means 119-125 that process the selected data signals.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a television data broadcast receiving apparatus for receiving a data broadcast multiplexed and broadcast on two subcarriers of 4.5 fH and 7.5 fH in the audio band of a television broadcast wave. It concerns the device.

[0002]

2. Description of the Related Art An audio subcarrier multiplexing system for multiplexing data on a subcarrier in an audio band of a television broadcast wave is scheduled to be newly commercialized in 1998. No. 83, “Technical conditions for terrestrial data broadcasting”, “Technical conditions for terrestrial data broadcasting using a transmission path using a subcarrier”, January 25, 1996).
According to this, data can be decoded as long as the audio signal can be demodulated.

A conventional television data broadcast receiving apparatus of this type will be described below with reference to FIG. FIG.
Wherein 1 is an antenna for receiving a television signal,
2 is a tuner for tuning and selecting a specific television signal,
Reference numeral 3 denotes an audio detector for detecting an audio signal in the tuned television signal, and reference numeral 4 denotes an A / D converter for converting the analog audio signal detected by the audio detector 3 into a digital audio signal.
It is a converter.

A clock generating unit 5 generates two kinds of clock signals phase-locked to the carrier extracted from the data signal. The clock generating unit 5a generates a 4.5fH clock signal, and a 4.5fH clock generating unit 5a and a 7.5fH clock signal. A 7.5fH clock generator 5b for generating a clock signal of
It has a switch 5c for switching the output between the 4.5fH clock generator 5a and the 7.5fH clock generator 5b.

Note that fH indicates the horizontal scanning frequency of the NTSC television signal. Here, the 4.5 fH clock generator 5a uses 288 kHz, and the 7.5 fH clock generator 5b uses 480 kHz.

Reference numeral 6 denotes a digital filter for extracting either a 4.5 fH data signal or a 7.5 fH data signal multiplexed on the subcarrier of the television signal in accordance with the setting of the switch 5 c. A 4-phase PSK demodulator for demodulating a 4-phase PSK-modulated data signal, 8 is a differential decoder for decoding I and Q signals of data, 9 is a scrambler and an interleaver which are processed for each frame on the transmission side. Is a descrambling / deinterleaving unit for restoring the

Reference numeral 10 denotes an FC synchronous reproduction unit for detecting a frame signal from a data signal, 11 an error correction unit for detecting and correcting a code error of a received data signal, and 12 a display unit 13 for displaying input packet data. A packet output interface 13 converts necessary data, a clock, and a strobe signal and outputs the converted signal. A display unit 13 displays the data signal on a display or the like. Reference numeral 14 denotes an operation unit that operates the system, and 15 denotes a control unit that controls the above-described circuit blocks 2 to 12 based on an operation input of the operation unit 14.

With the above-described configuration, the data signal multiplexed on the audio subcarrier of the television signal is extracted by one digital filter 6 and is subjected to predetermined processing by the descrambling / deinterleaving section 9 to the packet output interface 12. , It can be displayed on the display unit 13.

On the other hand, there has been conventionally known an automobile TV antenna apparatus which can receive a television signal in a good reception state at all times by using a plurality of antennas. FIG. 11 shows this TV antenna device for a vehicle.
This will be described below. In FIG. 11, reference numeral 21 denotes a rear glass of an automobile. The rear glass 21 is provided with four antennas 23, 24, 25, and 26 for receiving television broadcasts in addition to the heater wire 22.

Reference numeral 27 denotes each antenna 23, 24, 25, 26
A TV amplifier that amplifies each of the television signals received at step (a) and amplifies the four television signals to a level that can be processed by the diversity unit 28 at the subsequent stage, and outputs the television signals. Among them, a diversity unit 29 that selects and outputs a signal having the highest SN ratio level, for example, and a TV (television receiver) 29 that receives and displays a television signal from the diversity unit 28.

With the above configuration, the TV 29 always receives the supply of the best television signal among the four television signals received by the antennas 23, 24, 25 and 26.

However, in the above-described automobile TV antenna device, there is no problem if any of the four antennas 23, 24, 25, and 26 has a good television signal. There are strict restrictions on the number, shape, size, direction, etc. of the antennas that can be arranged above, so that any one of the television signals is not always good, Since there may be a case where no good signal exists, it is difficult to realize a directional characteristic that can cover all directions even if the four antennas 23, 24, 25, and 26 are used.

Therefore, as a method for improving this problem,
For example, Japanese Unexamined Patent Publication No. Hei 6-21859 proposes a TV antenna device for an automobile, which generates and uses a signal having a predetermined phase difference from a television signal output. This vehicle TV antenna device will be described below with reference to FIG.

In FIG. 12, a variable phase shift module 31 receives a television signal output from an antenna 23 and a television signal output from an antenna 24 and generates a signal having a predetermined phase difference from the two output signals. , 32 is another variable phase shift module that receives the television signal output of the antenna 23 and the television signal output of the antenna 24, and generates a signal having a predetermined phase difference from the two output signals. For example, the variable phase shift module 3
1 is set so that the phase is advanced by a maximum of π, and the variable phase shift module 32 is set so that the phase is delayed by a maximum of π.

Reference numeral 33 denotes a TV amplifier for amplifying and processing the four television signals from the antennas 23 and 24 and the variable phase shift modules 31 and 32, respectively, and reference numeral 34 denotes a signal having the highest SN ratio among the outputs of the TV amplifier 33, for example. Is a diversity unit to be supplied to the TV 35.

The TV 35 feeds back the reception state to the variable phase shift modules 31 and 32 and controls the phase difference between the variable phase shift modules 31 and 32 so as to obtain a good reception state. As a result, the number of signals that can be selected by the diversity unit 34 can be increased, so that the directional characteristics can be improved.

Further, in the conventional digital mobile telephone system of the zone switching system, since the voice channel is interrupted instantaneously when the zone is switched, there is a problem that the voice of the caller is inevitably interrupted. An improved method is disclosed in, for example, Japanese Patent Application Laid-Open No.
No. 22 proposes this. This zone switching method will be described below with reference to FIG.

In FIG. 13, reference numeral 41 denotes a mobile station, 42 denotes a radio station, 43 denotes a base station control station, and 51 denotes an exchange. The base station control station 43 includes a voice channel processor 4
4, a zone switching generator 45 is provided, and the audio channel processing device 44 has a dual port RAM 46 in the down direction, a dual port RAM 47 in the up direction,
A silence pattern detection unit 48 in the down direction, a silence pattern detection unit 49 in the up direction, and a control unit 50 are provided.

In the above configuration, when the mobile station 41 is moving from one zone to another zone, the base mobile station 43
In the above, the zone switching generation unit 45 is used for the wireless base station 42 of each zone.
According to the data obtained by measuring the radio field intensity from the mobile device 41 in
I am watching the timing of performing zone switching. Then, when a certain time before the time when the zone switching is predicted, the audio data in the audio channel processor 44 is prohibited from being read from the dual port RAMs 46 and 47 by the control unit 50, and the output of the audio data is stopped. I do.

While the output of the audio data is stopped, the writing of the audio data continues, and the dual port RAM 4
6 and 47 are sequentially stored. The zone switching generator 45 performs zone switching at the time of zone switching, and permits reading from the dual port RAM 47 of the audio channel processing device 44 via the controller 50 at the end of switching.

The reading of audio data is performed sequentially from old data. At this time, the voice of the caller reaches the other party a little longer immediately before the zone switching, but almost no abnormality is perceived by humans. By performing such processing, when the zone is switched in the digital mobile phone system of the zone switching system, the voice channel is momentarily interrupted,
This solves the problem that the voice of the caller is inevitably interrupted.

[0022]

However, FIG.
In addition, in the conventional television data broadcast receiving device described above, especially in the case of a portable terminal or a fixed antenna, the reception state depends on the directivity of the antenna, and the number, shape, size, Since there are strict restrictions on the direction and the like, one or both of the data signals multiplexed on the two subcarriers are not always good, so that there is a problem that a good reception state cannot always be obtained. Was.

Also, since only one of the signals multiplexed on the two sub-carriers of the television signal can be received, there is a problem that the amount of information that can be obtained at the same time is reduced by half. Since both signals multiplexed on two subcarriers of a television signal of a broadcasting station cannot be received, there has been a problem that the width of obtained information is narrowed down to one broadcasting station.

Furthermore, even if the conventional technique described above with reference to FIGS. 11 to 13 is applied, one or both of the signals multiplexed on the two subcarriers of the television signal are not necessarily good. However, both cannot be received at the same time, and furthermore, only one of the signals multiplexed on the two sub-carriers of the television signal can be received. The problem of halving is not solved.

The present invention has been made in view of the above points, and enables good reception even when the reception state is not good. Further, two types of multiplexed signals on two subcarriers are provided. Each of the signals can be received,
An object of the present invention is to provide a television data broadcast receiving device capable of receiving each of two types of signals from different broadcast stations.

[0026]

According to a first aspect of the present invention, there is provided a television data broadcast receiving apparatus for transmitting two sub-carriers of 4.5 fH and 7.5 fH in an audio band of a television broadcast wave. A receiving device for multiplexing and broadcasting data broadcasting, comprising: at least two or more receiving means for receiving the same television broadcast wave; At least two or more extraction means for extracting either the extracted data signal or the data signal multiplexed at 7.5 fH, and each reception state is determined from the data signal output extracted by each of the extraction means. Measuring means for measuring, selecting means for selecting a data signal output having the best reception state based on the measurement result of the measuring means, and processing the data signal selected by the selecting means It is provided with a processing means that.

Thus, 4.5 fH or 7.5 fH
Even if the reception state of the data signal multiplexed into the data signal is poor, it is possible to select the output with the best reception state among the data signal outputs extracted by the plurality of extraction means, so that a good reception state is always obtained. Becomes possible.

[0028] The television data broadcast receiving apparatus according to the second aspect of the present invention is multiplexed and broadcast on subcarriers of two channels of 4.5 fH and 7.5 fH in the audio band of the television broadcast wave. A data broadcast receiving apparatus for generating a signal having a predetermined phase difference from at least two or more receiving means for receiving the same television broadcast wave and receiving outputs of the respective receiving means. Generating means for extracting either a data signal multiplexed at 4.5 fH or a data signal multiplexed at 7.5 fH from output signals of the respective receiving means and generating means. Extraction means, measurement means for measuring each reception state from the data signal output extracted by each of the extraction means, based on the measurement result of the measurement means, Selection means for selecting the data signal output have, is provided with a processing means for processing the data signal selected by said selection means.

As a result, 4.5 fH or 7.5 fH
Even when the reception state of the data signal multiplexed in is poor, by generating a new signal having a predetermined phase difference from the plurality of reception outputs, the number of selectable signals can be increased, and It is possible to obtain a reception state.

[0030] The television data broadcast receiving apparatus according to the third aspect of the present invention is multiplexed and broadcast on two-channel subcarriers of 4.5 fH and 7.5 fH in the audio band of the television broadcast wave. What is claimed is: 1. A data broadcast receiving apparatus, comprising: a receiving unit for receiving a television broadcast wave; Two extracting means for respectively extracting, two processing means for respectively processing the two data signals extracted by the respective extracting means, and two data signals processed by the processing means being arbitrarily selected. And selecting means for selecting and outputting.

Thus, 4.5 fH and 7.5 fH
By extracting each of the data signals multiplexed on the two-channel subcarriers, it becomes possible to view both the broadcast contents of the data signals multiplexed on the two-channel subcarriers.

The television data broadcast receiving apparatus according to the fourth aspect of the present invention is multiplexed and broadcast on two subcarriers of 4.5 fH and 7.5 fH in the audio band of the television broadcast wave. What is claimed is: 1. A data broadcast receiving apparatus, comprising: a receiving unit for receiving a television broadcast wave; and a receiving signal output from the receiving unit, the receiving unit multiplexes a 4.5 fH multiplexed data signal and a 7.5 fH multiplexed data signal. Two extracting means for extracting each, a storing means for temporarily storing each of the two data signals extracted by each of the extracting means, and arbitrarily selecting and outputting the two data signals stored by the storing means There is provided a selection unit and a processing unit for processing the data signal selected by the selection unit.

Thus, 4.5 fH and 7.5 fH
After temporarily storing the multiplexed data signals on the two-channel subcarriers and arbitrarily selecting and outputting the stored two data signals, a predetermined process is performed to greatly reduce the hardware scale. It is possible to view both broadcast contents of the data signal multiplexed on the two-channel subcarrier.

The television data broadcast receiving apparatus according to the fifth aspect of the present invention is multiplexed and broadcast on subcarriers of two channels of 4.5 fH and 7.5 fH in the audio band of the television broadcast wave. A data broadcast receiving apparatus, comprising: at least two or more receiving means for simultaneously receiving a plurality of types of television broadcast waves; and a data signal multiplexed to 4.5 fH from a reception output by each of the receiving means. Or at least two or more extraction means for extracting data signals multiplexed at 7.5 fH, and at least two extraction means for processing at least two or more data signals extracted by each of the extraction means. The above-mentioned processing means and a selection means for arbitrarily selecting and outputting at least two or more data signals processed by the processing means are provided.

Thus, at least two types of television broadcast waves are tuned and selected, and data signals multiplexed on two sub-carriers of 4.5 fH or 7.5 fH are respectively extracted to obtain different television broadcast waves. It is possible to view both broadcast contents of the data signal multiplexed on the two subcarriers.

The television data broadcast receiving apparatus according to the invention of claim 6 of the present application multiplexes and broadcasts on two subcarriers of 4.5 fH and 7.5 fH in the audio band of the television broadcast wave. A data broadcast receiving apparatus, comprising: at least two or more receiving means for simultaneously receiving a plurality of types of television broadcast waves; and a data signal multiplexed to 4.5 fH from a reception output by each of the receiving means. Or at least two or more extraction means for respectively extracting data signals multiplexed at 7.5 fH, and storage means for temporarily storing at least two or more data signals extracted by each of the extraction means, Selecting means for arbitrarily selecting and outputting at least two or more data signals accumulated by the accumulating means, and processing the data signal selected by the selecting means It is provided with a eye processing means.

Thus, the data signals multiplexed on the two subcarriers of different television broadcast waves are temporarily stored, and the two stored data signals are arbitrarily selected and output, and then the processing is performed. It is possible to watch both broadcast contents of the data signal multiplexed on two subcarriers of different television broadcast waves while greatly reducing the scale.

[0038]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of a television data broadcast receiving apparatus according to the present invention will be described below with reference to FIG. Here, FIG. 1 is a block diagram showing the television data broadcast receiving apparatus of the present embodiment.

In FIG. 1, reference numeral 101 denotes a rear glass of an automobile.
2 and two antennas 1 for receiving a television broadcast.
03 and 104 are provided. 105 is each antenna 1
The tuner performs an amplification process on each of the television signals received at 03 and 104, and tunes and selects a specific television signal.

Reference numerals 106 and 107 denote audio detectors for detecting an audio signal in the tuned television signal.
Reference numerals 8 and 109 denote A / Ds for converting the analog audio signals detected by the audio detectors 106 and 107 into digital audio signals.
It is a converter. Here, the antennas 103 to A / D
The converter 109 constitutes a receiving unit.

Reference numerals 110 and 111 denote 4.5 fH / 7.5 fH digital filters for extracting any of the 4.5 fH / 7.5 fH data signals multiplexed on the subcarrier of the television signal, and 112 and 113 denote 4-phase PSK. 4-phase PSK demodulator for demodulating the modulated data signal, 114, 115
Is a differential decoding unit for decoding I and Q signals of data.
Note that, here, the 4.5 fH / 7.5 fH digital filter 110 to the differential decoding unit 115 constitute an extraction unit.

Reference numerals 116 and 117 denote differential decoding units 114 and 11
5 is an error rate measuring unit that receives the output of each of the signals 5 and measures the respective bit error rates, and constitutes measuring means. Reference numeral 118 denotes each of the error rate measurement units 116 and 117
Is a selector that receives the measurement result of (1) and selects the data signal with the lower error rate, and constitutes a selection unit.

Reference numeral 119 denotes a descramble / deinterleave unit for restoring scramble and interleave processed for each frame on the transmission side, 121 an FC synchronous reproduction unit for detecting a frame signal from a data signal, and 123
Is an error correction unit that detects and corrects a code error of the received data signal, and 125 is a display unit 1 that displays the input packet data.
A packet output interface 27 converts the data into a necessary data, clock, and strobe signal and outputs the converted signal.
Here, the descramble / deinterleave unit 1
19 to the packet output interface 125 constitute processing means.

Reference numeral 127 denotes a display unit for displaying a data signal on a display or the like; 128, an operation unit for operating the system;
A control unit 129 controls the above-described circuit blocks 105 to 115 and 119 to 125 based on an operation input of the operation unit 128.

As described above, at least two systems of sound detectors 10 are used for the television broadcast waves from the plurality of antennas 103 and 104 tuned and selected by the tuner 105.
6, 107 to differential decoding units 114 and 115 are provided, and among the data signal outputs from the differential decoding units 114 and 115, an output with a high error rate is selected by the selector 118. , It is possible to always obtain a good reception state even when the reception is bad.

In this embodiment, the error rate measuring units 116 and 117 are provided as the measuring means for measuring the reception state in order to improve the measurement accuracy. For example, the aperture ratio of the eye pattern is measured. It is clear that measurement by other methods may be used.

A second embodiment of the television data broadcast receiving apparatus according to the present invention will be described with reference to FIG. 2. The same parts as those in the first embodiment are denoted by the same reference numerals, and the description thereof will be omitted. Here, FIG. 2 is a block diagram showing the television data broadcast receiving apparatus of the present embodiment.

In FIG. 2, reference numeral 131 denotes a variable phase shift module which receives television signal outputs from the antennas 103 and 104 and generates a signal having a predetermined phase difference from the two output signals. Upon receiving the television signal output from the antenna 104,
This is another variable phase shift module that generates a signal having a predetermined phase difference from two output signals.

For example, the variable phase shift module 131 is set so that the phase is advanced by a maximum of π.
32 is set so that the phase is delayed by a maximum of π. The variable phase shift modules 131 and 132 constitute generating means for generating a signal having a predetermined phase difference.

Reference numeral 135 denotes a tuner that performs amplification processing on each of the four television signals from the antennas 103 and 104 and the variable phase shift modules 131 and 132, and tunes and selects a specific television signal. 136, 13
Reference numeral 7 denotes an audio detector for detecting an audio signal in the tuned television signal, and 138 and 139 denote an audio detector 13.
6, an A / D converter for converting the analog audio signal detected at 137 into a digital audio signal. Note that, here, the antennas 103 and 104 to the A / D converter 109 and the tuner 135 to the A / D converter 139 constitute a receiving unit.

Numerals 140 and 141 denote 4.5 fH / 7.5 fH digital filters for extracting any of the 4.5 fH / 7.5 fH data signals multiplexed on the subcarrier of the television signal, and 142 and 143 denote 4-phase PSK. Four-phase PSK demodulator for demodulating the modulated data signal, 144, 145
Is a differential decoding unit for decoding I and Q signals of data.
Note that, here, the 4.5 fH / 7.5 fH digital filter 110 to the differential decoding unit 115 and the 4.5 fH / 7.5 fH.
The fH digital filter 140 to the differential decoding unit 145 constitute an extracting unit.

146 and 147 are differential decoding units 144 and 14
5 is an error rate measuring unit that receives the output of each of 5 and measures the respective bit error rates.
117 together with the measuring means. Also, 148
Are error rate measuring units 116, 117, 146,
It is a selector that receives the measurement result of 147 and selects the data signal with the lowest error rate, and constitutes a selection unit.

As described above, the television broadcast waves from the plurality of antennas 103 and 104 and the variable phase shift modules 131 and 132 tuned and selected by the tuner 135 are provided with at least four systems of sound detectors 106 and 107, 1
36, 137 to differential decoding units 114, 115, 144, 1
45, and the differential decoding units 114, 115, 144, 1
Since the output having the best error rate is selected by the selector 148 among the respective data signal outputs from the respective data signals 45, it is possible to obtain a better reception state as compared with the first embodiment. .

Further, a third embodiment of the television data broadcast receiving apparatus of the present invention will be described with reference to FIG. Here, FIG. 3 is a block diagram showing the television data broadcast receiving apparatus of the present embodiment.

In FIG. 3, reference numeral 153 denotes an antenna for receiving a television broadcast; 155, a tuner for performing amplification processing on a television signal received by the antenna 153 to tune and select a specific television signal; An audio detector 158 for detecting an audio signal in the selected television signal converts an analog audio signal detected by the audio detector 156 into a digital audio signal.
It is a converter. Here, the antennas 153 to A / D
The converter 158 forms a receiving unit.

Reference numeral 160 extracts a 4.5 fH data signal multiplexed on the subcarrier of the television signal.
A digital filter 161 is a 7.5 fH digital filter for extracting a 7.5 fH data signal multiplexed on a subcarrier of the television signal, and 162 and 163 are 4-phase PSK demodulators for demodulating a 4-phase PSK modulated data signal. Reference numerals 164 and 165 denote differential decoding units for decoding data I and Q signals. Here, the 4.5 fH digital filter 160 to the differential decoding unit 165 constitute an extracting unit.

169 and 170 are differential decoding units 164 and 16
5, the descrambling / de-interleaving section 171 and 172 for recovering the scramble and interleave processed for each frame on the transmission side, and 171 and 172 for detecting the frame signal from the data signal. , 173 and 174 are error correction units for detecting and correcting code errors in the received data signal, and 175 and 176 are packets for converting the input packet data into data, clock and strobe signals required by the display unit 177 and outputting the converted data. Output interface. Here, the processing means is constituted by the descramble / deinterleave unit 169 to the packet output interface 176.

181 and 182 are memories for individually storing the data signal multiplexed at 4.5 fH and the data signal multiplexed at 7.5 fH, and 183 is an operation unit 178.
Is a selector for selecting either the data signal multiplexed at 4.5 fH or the data signal multiplexed at 7.5 fH in accordance with the instruction (user operation or the like), and constitutes a selection means. .

Reference numeral 177 denotes a display unit for displaying a data signal on a display or the like; 178, an operation unit for operating the system;
A control unit 179 controls each of the circuit blocks 155 to 183 based on an operation input of the operation unit 178.

As described above, after performing predetermined processing on the data signal multiplexed at 4.5 fH and the data signal multiplexed at 7.5 fH, the data signals are temporarily stored in the memories 180 and 182, and Is output by the selector 183, the data signal multiplexed to 4.5 fH of the same television broadcast wave and 7.5
It is possible to view both broadcast contents of the data signal multiplexed on fH.

A fourth embodiment of the television data broadcast receiving apparatus according to the present invention will be described with reference to FIGS. 4 to 7. The same parts as those in the third embodiment are denoted by the same reference numerals, and the description thereof will be omitted. Is omitted.

Here, FIG. 4 is a block diagram showing a television data broadcast receiving apparatus according to the present embodiment, FIG. 5 is an explanatory view showing a packet structure in a terrestrial data broadcast audio subcarrier system, and FIG. FIG. 3 is an explanatory diagram illustrating a configuration example of RAMs 191 and 192 in the television data broadcast receiving device. FIG. 7 is a time chart showing write and read timings of the RAM # 0 and the RAM # 1 in the television data broadcast receiving device of the present embodiment.

In FIG. 4, reference numeral 191 denotes two RAMs for respectively storing data of one frame of the data signal multiplexed at 4.5 fH, and 192 denotes one RAM of one frame of the data signal multiplexed at 7.5 fH. RAM 193 for storing data of each of the RAMs 193 and RAM1
A memory control unit that controls writing and reading of the N. 92, respectively.

Here, the frame configuration of the audio subcarrier multiplexing system for multiplexing data on the subcarriers in the audio band of the television broadcast wave will be described with reference to FIG. In FIG. 5, the frame structure of the data signal is composed of 32 rows (packets) × 288 columns (bits) following a 16-bit framing code (hereinafter, referred to as FC). Packets are transmitted after being subjected to bit interleaving for transmitting data in the vertical direction.

The error correction code is a (16, 5) BCH code for the service identification (hereinafter referred to as MC) of the data packet portion composed of the first 16 bits of the packet, and the data packet (prefix) after the MC portion. (Hereinafter, referred to as PF) and information data section (hereinafter, DAT)
)), A (272, 190) shortened difference set cyclic code (hereinafter, referred to as CHC) is used. The data signal after the FC is scrambled in a predetermined manner.

Therefore, the memory capacity per frame of the RAMs 191 and 192 is 16 (FC) + [32 (row)
× 288 (columns)] = capacity of 9232 bits is sufficient. If it is not necessary to store the FC in memory, it is sufficient to have a capacity of 9232-16 = 9216 bits.

As described above, since the data signal is interleaved, when writing to the RAMs 191 and 192, it is sufficient to generate a write address so as to perform deinterleaving.

The descrambling / deinterleaving section 199, the FC synchronous reproducing section 201, the error correcting section 203, and the packet output interface 205 are composed of the first to third sections.
Performs the same processing as the circuit block in the embodiment,
Since it is necessary to perform the processing of two systems of 4.5 fH and 7.5 fH, the operation speed is at least twice as fast as the circuit blocks shown in FIGS. 1 to 3.

Reference numeral 208 denotes an operation unit for operating the present system, 2
A control unit 09 controls the above-described circuit blocks 155 to 165 and 193 to 205 based on an operation input of the operation unit 208.

Next, writing in the RAMs 191 and 192,
The reading process will be described with reference to FIGS. 6, RAMs 191 and 192 are RAM # 0 and RAM # 1 for storing data of one frame, respectively.
The writing and reading of these RAM # 0 and RAM # 1 are controlled by the memory control unit 193.

In the time chart of FIG. 7, one frame period is defined as a0 to a1, a2 to a3, a4 to a
5, if the period is indicated by a6 to a7, the write operation timing is, for example, 1 of the 4.5fH data signal.
The frame portion is stored in the RAM 191 during the period from a0 to a1.
# 0, and the data signal written during this period is a
2, the data signal for the next one frame is written into the RAM # 1 of the RAM 191 during the periods a2 to a3, and the data signal written during this period is read during the period a4.

The data signal for the next one frame is represented by a
Data is written to RAM # 0 of the RAM 191 during the period of 4 to a5, the data signal written during this period is read during the period of a6, and the data signal for the next one frame is written to RAM # 1 of the RAM 191 during the period of a6 to a7. The data signal written during this period is read out during the period a8.

On the other hand, a data signal for one frame of the 7.5fH data signal is written to RAM # 0 of the RAM 192 during the period of a0 to a1, and the data signal written during this period is read during the period of a3. The data signal for the frame is written into the RAM # 1 of the RAM 192 during the period a2 to a3, and the data signal written during this period is read during the period a5.

The data signal for the next one frame is represented by a
The data is written into the RAM # 0 of the RAM 192 during the period from 4 to a5, and the data signal written during this period is read during the period a7.

As described above, reading is performed at least twice as fast as the writing period, and RAMs 191 and 19 are read.
If the control is performed so that the read timings of No. 2 do not overlap with each other, the circuits 199 to 205 thereafter can be integrated into one system, so that the hardware scale can be significantly reduced.

Next, a fifth embodiment of the television data broadcast receiving apparatus of the present invention will be described with reference to FIG. Here, FIG. 8 is a block diagram showing the television data broadcast receiving apparatus of the present embodiment.

In FIG. 8, reference numeral 211 denotes a rear glass of an automobile.
2 and two antennas 2 for receiving television broadcasts.
13, 214 are provided. Tuners 215 and 216 perform amplification processing on each of the television signals received by each of the antennas 213 and 214, and individually tune and select specific television signals.

Reference numerals 226 and 227 denote audio detectors for detecting an audio signal in the tuned television signal.
Reference numerals 8 and 229 denote A / Ds that convert the analog audio signals detected by the audio detectors 226 and 227 into digital audio signals.
It is a converter. Here, the antennas 213 to A / D
The converter 229 forms a receiving unit.

[0079] 4.5fH extracts a 4.5fH data signal multiplexed on the subcarrier of the television signal.
A digital filter 231 extracts a 7.5 fH data signal multiplexed on a subcarrier of the television signal, and a 7.5 fH digital filter 232 233 demodulates a 4-phase PSK-modulated data signal. Reference numerals 234, 235 denote differential decoding units for decoding data I and Q signals. Here, the 4.5 fH digital filter 230 to the differential decoding unit 235 constitute an extracting unit.

239 and 240 are differential decoding units 234 and 23
5, a descrambling / deinterleaving unit for restoring the scramble and interleave processed for each frame on the transmission side, and 241 and 242 are FC synchronous reproduction units for detecting a frame signal from a data signal. Reference numerals 243 and 244 denote error correction units for detecting and correcting code errors in the received data signal. Reference numerals 245 and 246 denote packets output from the display unit 247 after converting the input packet data into necessary data, clocks, and strobe signals. Output interface. Here, processing means is constituted by the descrambling / deinterleaving section 239 to the packet output interface 246.

251 and 252 are memories for individually storing the data signal multiplexed at 4.5 fH and the data signal multiplexed at 7.5 fH, and 253 is an operation unit 248
Is a selector for selecting either the data signal multiplexed at 4.5 fH or the data signal multiplexed at 7.5 fH in accordance with the instruction (user operation or the like), and constitutes a selection means. .

Reference numeral 247 denotes a display unit for displaying a data signal on a display or the like; 248, an operation unit for operating the system;
A control unit 249 controls each of the circuit blocks 215 to 253 based on an operation input of the operation unit 248.

As described above, 4.5 of the different television broadcast waves tuned and selected by the tuners 215 and 216, respectively.
After subjecting the data signal multiplexed to fH and the data signal multiplexed to 7.5 fH to predetermined processing, the memory 2
Since the data signal of a desired channel is temporarily output to the selector 253, the data signal is temporarily stored in 51 and 252.
It becomes possible to view both the data signals multiplexed at 4.5 fH and the broadcast contents of the data signals multiplexed at 7.5 fH of different television broadcast waves.

Next, a sixth embodiment of the television data broadcast receiving apparatus of the present invention will be described with reference to FIG.
The same parts as those in the fifth embodiment are denoted by the same reference numerals, and description thereof will be omitted. Here, FIG. 9 is a block diagram showing the television data broadcast receiving apparatus of the present embodiment.

In FIG. 9, reference numeral 261 denotes two RAMs for storing data of one frame of the data signal multiplexed at 4.5 fH, and 262 denotes one RAM of the data signal multiplexed at 7.5 fH. RAM 263 for storing the data of RAM 261 and RAM 2
62 is a memory control unit for controlling writing and reading, respectively.

The writing and reading processes of the RAMs 261 and 262 are the same as those of the RAMs 191 and 192 in the fourth embodiment described above with reference to FIGS.

269 is a descrambling / deinterleaving section, 271 is an FC synchronous reproducing section, 273 is an error correcting section,
Reference numeral 275 denotes a packet output interface, which needs to perform two types of processing, 4.5 fH and 7.5 fH, and therefore requires at least twice the operation speed as compared with the circuit block shown in FIG.

Reference numeral 278 denotes an operation unit for operating the present system;
A control unit 79 controls the above-described circuit blocks 215 to 235 and 263 to 275 based on an operation input of the operation unit 278.

As described above, the differential decoding units 243 and 244
In the subsequent stage, RAs are read at a speed at least twice as fast as the writing period so as not to overlap each other.
By providing the M261 and M262, the circuits 269 to 275 constituting the subsequent processing means can be integrated into one system, so that the hardware scale can be significantly reduced.

[0090]

Since the television data broadcast receiving apparatus according to the first aspect of the present invention has the above-described configuration, the reception state of the data signal multiplexed at 4.5 fH or 7.5 fH is poor. Even in this case, it is possible to select the output having the best reception state from among the data signal outputs extracted by the plurality of extraction means, so that it is possible to always obtain a good reception state.

[0091] The television data broadcast receiving apparatus according to the second aspect of the present invention is 4.5fH or 7.5fH.
Even when the reception state of the data signal multiplexed in is poor, by generating a new signal having a predetermined phase difference from the plurality of reception outputs, the number of selectable signals can be increased, and It is possible to obtain a reception state.

[0092] The television data broadcast receiving apparatus according to the third aspect of the present invention provides 4.5 fH and 7.5 fH.
By extracting each of the data signals multiplexed on the two-channel subcarriers, it becomes possible to view both the broadcast contents of the data signals multiplexed on the two-channel subcarriers.

[0093] The television data broadcast receiving apparatus according to the fourth aspect of the present invention provides 4.5 fH and 7.5 fH.
After temporarily storing the multiplexed data signals on the two-channel subcarriers and arbitrarily selecting and outputting the stored two data signals, a predetermined process is performed to greatly reduce the hardware scale. It is possible to view both broadcast contents of the data signal multiplexed on the two-channel subcarrier.

A television data broadcast receiving apparatus according to a fifth aspect of the present invention tunes and selects at least two types of television broadcast waves and multiplexes them on two subcarriers of 4.5 fH or 7.5 fH. By extracting the respective data signals, it becomes possible to view both the broadcast contents of the data signals multiplexed on the two subcarriers of different television broadcast waves.

A television data broadcast receiving apparatus according to a sixth aspect of the present invention temporarily stores data signals multiplexed on two subcarriers of different television broadcast waves, and converts the two stored data signals. After arbitrarily selecting and outputting, by performing a predetermined process, both the broadcast contents of the data signal multiplexed on the two subcarriers of different television broadcast waves are viewed while greatly reducing the hardware scale. It becomes possible.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a first embodiment of a television data broadcast receiving device of the present invention.

FIG. 2 is a block diagram showing a second embodiment of the television data broadcast receiving apparatus of the present invention.

FIG. 3 is a block diagram showing a third embodiment of the television data broadcast receiving device of the present invention.

FIG. 4 is a block diagram showing a fourth embodiment of the television data broadcast receiving apparatus of the present invention.

FIG. 5 is an explanatory diagram showing a packet structure in an audio subcarrier system of terrestrial data broadcasting.

FIG. 6 is an explanatory diagram showing a configuration example of RAMs 191 and 192 in a fourth embodiment of the television data broadcast receiving device of the present invention.

FIG. 7 is a time chart showing write and read timings of RAM # 0 and RAM # 1 in a fourth embodiment of the television data broadcast receiving apparatus of the present invention.

FIG. 8 is a block diagram showing a fifth embodiment of the television data broadcast receiving device of the present invention.

FIG. 9 is a block diagram showing a sixth embodiment of the television data broadcast receiving apparatus of the present invention.

FIG. 10 is a block diagram showing a conventional television data broadcast receiving device.

FIG. 11 is a schematic configuration diagram showing an example of a conventional automobile TV antenna device.

FIG. 12 is a schematic configuration diagram showing another example of the conventional automobile TV antenna device.

FIG. 13 is a schematic configuration diagram showing a conventional digital mobile telephone system.

[Explanation of symbols]

101, 211 Rear glass 102, 212 Heater wire 103, 104, 153 Antenna 105, 135, 155, 215, 216 Tuner 106, 107, 136, 137, 156, 226, 2
27 sound detectors 108, 109, 138, 139, 158, 228, 2
29 A / D converter 110, 111, 140, 141 4.5 fH / 7.5
fH digital filter 160, 230 4.5 fH digital filter 161, 231 7.5 fH digital filter 112, 113, 142, 143, 162, 163, 2
32, 233 4-phase PSK demodulators 114, 115, 144, 145, 164, 165, 2
34, 235 Differential decoding section 116, 117, 146, 147 Error rate measuring section 118, 148, 183, 253 Selector 119, 169, 170, 199, 239, 240, 2
69 Descramble / Deinterleave section 121,171,172,201,241,242,2
71 FC synchronous playback unit 123, 173, 174, 203, 243, 244, 2
73 error correction unit 125, 175, 176, 205, 245, 246, 2
75 Packet output interface 127, 177, 247 Display unit 128, 178, 208, 248, 278 Operation unit 129, 179, 209, 249, 279 Control unit 131, 132 Variable phase shift module 181, 182, 251, 252 Memory 191, 192, 261, 262 RAM 193, 263 Memory control unit

Claims (6)

[Claims] 1. An audio band of a television broadcast wave.
A data broadcast receiving apparatus multiplexed and broadcast on sub-carriers of two channels of 5fH and 7.5fH, comprising: at least two or more receiving means for receiving the same television broadcast wave; At least two extraction means for extracting either a data signal multiplexed at 4.5 fH or a data signal multiplexed at 7.5 fH from a reception output by the reception means, and each of the extraction means Measuring means for measuring each reception state from the output data signal, selecting means for selecting a data signal output having the best reception state based on the measurement result of the measuring means, and data selected by the selection means A television data broadcast receiving device, comprising: processing means for processing a signal. 2. In the audio band of the television broadcast wave.
A data broadcast receiving apparatus multiplexed and broadcast on sub-carriers of two channels of 5fH and 7.5fH, comprising: at least two or more receiving means for receiving the same television broadcast wave; Generating means for generating a signal having a predetermined phase difference from a reception output by the receiving means, and an output signal from each of the receiving means and the generating means,
At least two or more extraction means for extracting either the data signal multiplexed at 4.5 fH or the data signal multiplexed at 7.5 fH, and from the data signal output extracted by each of the extraction means, Measuring means for measuring each receiving state; selecting means for selecting a data signal output having the best receiving state based on the measurement result of the measuring means; processing means for processing the data signal selected by the selecting means; A television data broadcast receiving device, comprising: 3. In the audio band of the television broadcast wave.
3. A receiving device for a data broadcast that is multiplexed and broadcast on two-channel subcarriers of 5fH and 7.5fH, comprising: a receiving unit for receiving a television broadcast wave; Two extracting means for extracting the data signal multiplexed at 5fH and the data signal multiplexed at 7.5fH, respectively, and two extracting means for processing the two data signals extracted by the respective extracting means, respectively. A television data broadcast receiving apparatus, comprising: a processing unit; and a selection unit for arbitrarily selecting and outputting two data signals processed by the processing unit. 4. In the audio band of the television broadcast wave.
3. A receiving device for a data broadcast that is multiplexed and broadcast on two-channel subcarriers of 5fH and 7.5fH, comprising: a receiving unit for receiving a television broadcast wave; Two extracting means for extracting the data signal multiplexed at 5fH and the data signal multiplexed at 7.5fH, respectively, and accumulating means for temporarily storing the two data signals extracted by the respective extracting means. Television data, comprising: selecting means for arbitrarily selecting and outputting two data signals accumulated by the accumulating means; and processing means for processing the data signal selected by the selecting means. Broadcast receiver. 5. In the audio band of a television broadcast wave.
An apparatus for receiving a data broadcast that is multiplexed and broadcast on sub-carriers of two channels of 5fH and 7.5fH, wherein at least two or more receiving means for simultaneously receiving a plurality of types of television broadcast waves, At least two or more extracting means for respectively extracting a data signal multiplexed at 4.5 fH or a data signal multiplexed at 7.5 fH from a reception output by each receiving means; At least two or more processing means for respectively processing the at least two or more data signals, and a selection means for arbitrarily selecting and outputting at least two or more data signals processed by the processing means. A television data broadcast receiving device. 6. An audio band of a television broadcast wave.
An apparatus for receiving a data broadcast that is multiplexed and broadcast on sub-carriers of two channels of 5fH and 7.5fH, wherein at least two or more receiving means for simultaneously receiving a plurality of types of television broadcast waves, At least two or more extracting means for respectively extracting a data signal multiplexed at 4.5 fH or a data signal multiplexed at 7.5 fH from a reception output by each receiving means; Storage means for temporarily storing at least two or more data signals thus selected, selection means for arbitrarily selecting and outputting at least two or more data signals stored by the storage means, and data selected by the selection means A television data broadcast receiving apparatus, comprising: processing means for processing a signal.