WO2006115024A1

WO2006115024A1 - Mobile terminal equipped with tv

Info

Publication number: WO2006115024A1
Application number: PCT/JP2006/307539
Authority: WO
Inventors: Akira Kato
Original assignee: Murata Manufacturing Co., Ltd.
Priority date: 2005-04-22
Filing date: 2006-04-10
Publication date: 2006-11-02

Abstract

A non-reception state detecting part (23) determines whether a burst signal portion of a television broadcast signal (Stv) of time division system is being received, and then outputs a non-reception state detection signal (Sc). Independently of this, a burst control signal generating part (52) generates a burst control signal (Sb) according to the slot timings of predetermined intervals. An AND gate (31) performs AND operation based on the non-reception state detection signal (Sc) and burst control signal (Sb) to generate a transmission control signal (Sa), and outputs it to amplifiers (17,18) of a mobile telephone RF circuit (101). If the transmission is currently permitted, the amplifiers (17,18) each amplify, in accordance with the transmission control signal (Sa), a digitally modulated local-station-location notification signal and output it as a burst signal.

Description

Specification

Mobile terminal with TV

Technical field

TECHNICAL FIELD [0001] The present invention relates to a mobile terminal device with TV that receives τν broadcast and transmits / receives other communication signals, like a τν mobile phone.

Background art

Conventionally, various devices including a wireless communication unit and a television broadcast receiving unit have been devised!

(For example, see Patent Document 1).

[0003] As a device having such a wireless communication function and a television broadcast receiving function in one housing, there is a mobile phone with a television broadcast receiving function (hereinafter simply referred to as a "mobile phone with TV"). . A mobile phone with a TV includes a television receiver and a wireless communication unit having a wireless telephone function, and usually receives a television broadcast and displays it on a display unit when no telephone call is made.

[0004] By the way, there are two types of television broadcast reception methods: a method of receiving television broadcasts continuously in time and a method of receiving television broadcasts in time division. In the time-division television broadcasting system, the time for receiving a burst of television broadcast signals and the time for not receiving them alternately exist. In other words, a mobile phone with a TV waits for a TV broadcast signal until it receives a substantially burst TV broadcast signal! /, And until the next burst TV signal is received. There are alternating times. The “non-reception state” of the present invention means a state waiting for the next burst television broadcast signal.

[0005] On the other hand, a cellular system is generally employed as a communication format for wireless telephones. In the cellular system, a wide area to be serviced is divided into fine cells (regions), wireless base stations are installed in the cells, and wireless communication is performed while cooperating with each other. Each mobile phone transmits to the corresponding radio base station periodically even if it is not in a call in order to notify each radio base station of the power in which cell it exists. . Hereinafter, this transmission signal is referred to as “own station position notification signal”. Patent Document 1: Japanese Unexamined Patent Application Publication No. 2004-48447

Disclosure of the invention

Problems to be solved by the invention

[0006] However, since the local station position notification signal for the radio base station has a high signal strength, it affects reception of television broadcasts. That is, the local station notification signal transmitted by the local station wraps around and is received by the television receiver, which hinders reception of television broadcasts. For this reason, a conventional mobile phone with a TV is provided with a band rejection filter having a frequency band used by the mobile phone as a stop band between the antenna of the TV broadcast receiving unit and the demodulating unit.

[0007] However, such a band rejection filter is expensive, and by installing this band rejection filter, a space for this element is required in the casing of the mobile phone with TV. This will hinder downsizing.

[0008] Therefore, an object of the present invention is to provide a small mobile terminal with a TV with a simple structure without obstructing reception of a television broadcast by a local station position notification signal in a wireless communication function. is there.

Means for solving the problem

[0009] The present invention provides a television broadcast signal in a mobile terminal with a TV, comprising: a first communication unit that transmits and receives a first communication signal; and a television broadcast signal reception unit that receives video in a time division manner. Non-reception state detecting means for detecting the non-reception state of

V, and a transmission control means for performing communication permission control of the first communication unit.

[0010] In this configuration, when the non-reception state detection unit detects non-reception of the broadcast data of the television broadcast signal, the transmission control unit performs communication permission control on the first communication unit. On the other hand, when the non-reception state detecting means detects that the broadcast data of the television broadcast signal is being received, the transmission control means performs communication prohibition control on the first communication unit. As a result, the communication of the first communication unit is prohibited at the timing when the broadcast data of the television broadcast signal is substantially received, and the broadcast data of the television broadcast signal is substantially received! / ヽAt the timing, communication of the first communication unit is permitted.

[0011] Further, the mobile terminal with TV of the present invention is a power amplifier for RF transmission signals of the first communication unit. The communication permission control is performed by the output control.

In this configuration, when the transmission control unit detects non-reception of the television broadcast signal, the transmission control unit permits the output from the power amplifier existing in the final stage of the RF transmission signal of the first communication unit. On the other hand, when the transmission control means detects reception of a television broadcast signal, it stops outputting the power amplifier power.

[0013] Further, the mobile terminal with TV of the present invention is characterized in that the control means is configured by an AND circuit of a steady output control signal for the power amplifier and a signal indicating a non-reception state. Yes.

In this configuration, specifically, the transmission control means includes an AND circuit, and the AND circuit includes a steady output control signal for the power amplifier (power amplification is permitted by “: Hi”), a television set. Input a signal indicating the non-reception status of the broadcast signal (not received at “Hi”, received at “Low”), and output the result of the logical product operation to the power amplifier. As a result, the output of the power amplifier is permitted only when both the steady output control signal and the signal indicating the non-reception state are in the “Hi” state.

[0015] Further, the mobile terminal with TV according to the present invention is characterized in that communication permission control is performed in a transmission start process in the baseband processing unit of the RF transmission signal of the first communication unit.

In this configuration, when the transmission control unit detects a signal indicating a non-reception state, the transmission control unit permits the transmission processing of the first communication signal by the baseband processing unit of the first communication unit. The baseband processing unit starts transmission processing based on this permission processing, for example, performs output control of the power amplifier.

[0017] Further, the mobile terminal with TV according to the present invention is characterized in that it detects a non-reception state based on the demodulated signal of the television broadcast signal receiver! RU

[0018] In this configuration, specifically, the non-reception state detection means demodulates the television broadcast signal and determines that the television broadcast signal is not received unless broadcast data is detected. Then, the transmission control means performs communication permission control for the first communication unit. On the other hand, if the broadcast data is detected by demodulating the television broadcast signal, the non-reception state detecting means determines that the television broadcast signal is being received. Then, the transmission control means performs call prohibition control for the first communication unit. The invention's effect

[0019] According to the present invention, only when the broadcast data of the television broadcast signal is substantially received and not received and the non-receive state is detected, the first Communication is performed using communication signals. Thereby, the television broadcast signal receiving unit can prevent the reception of the television broadcast signal by the first communication signal that cannot be received during reception of the television broadcast signal.

[0020] Further, according to the present invention, transmission control of the first communication signal is performed by output control of the power amplifier of the first communication unit, so that transmission control can be reliably performed.

[0021] Further, according to the present invention, the transmission control of the first communication signal is performed by the AND circuit, so the transmission control of the first communication signal based on the non-reception state of the television broadcast signal is realized with a simple structure. be able to.

[0022] Further, according to the present invention, by applying the transmission control of the first communication signal based on the non-reception state of the television broadcast signal to the transmission control of the first communication signal in the baseband processing unit, It is possible to realize a simpler structure that requires the additional circuit as described above, or to use the current device configuration as it is.

[0023] According to the present invention, the reception state is detected when the broadcast data can be acquired by demodulating the television broadcast signal, and the non-reception state is detected when the broadcast data cannot be acquired. As a result, since the non-reception state is detected by directly using the television broadcast signal, the non-reception state can be reliably detected.

Brief Description of Drawings

FIG. 1 is a block diagram showing a schematic configuration of a TV-equipped mobile phone according to a first embodiment.

FIG. 2 is a partial block diagram of the mobile phone with TV according to the first embodiment.

FIG. 3 is a signal state diagram for explaining the operation of mobile phone transmission control section 301 at the time of receiving a television broadcast.

FIG. 4 is a block diagram showing a schematic configuration of a TV-equipped mobile phone according to a second embodiment.

FIG. 5 is a partial block diagram of a mobile phone with TV according to a second embodiment.

Explanation of symbols

[0025] 101—Mobile phone RF circuit 11 One quadrature modulator

12— RF transmission amplifier

13—PLL oscillator

14A, 14B—Mixer

15— π Ζ2 phase shift circuit

16—synthesizer

17—Driver Amplifier (DA)

18—Power amplifier (ΡΑ)

102—Mobile phone baseband processor

50—Transmission controller

51—Modulation signal generator

52—Burst control signal generator

103—telephone antenna

201—Television broadcast receiver

21—RF receiver

22—Demodulation and decoding unit

23—Non-reception status detector

202—MPEG decoder

203—Antenna for TV

301—Mobile phone transmission controller

31— AND gate

Sa—Transmission control signal

Sb—Burst control signal

Sc—Non-reception status detection signal

Stv—Television broadcast signal

BEST MODE FOR CARRYING OUT THE INVENTION

A mobile terminal with a TV according to a first embodiment of the present invention will be described with reference to FIGS. In the following description, a time-division mode terminal is used as a mobile terminal with TV. A cellular TV mobile phone that receives digital television broadcasts will be described as an example. The local station position notification signal of the mobile phone communication signal corresponds to the “first communication signal” of the present invention.

FIG. 1 is a block diagram showing a schematic configuration of a mobile phone with TV according to the present embodiment.

As shown in FIG. 1, the mobile phone with TV of this embodiment includes a mobile phone communication signal antenna 103 (hereinafter referred to as “telephone antenna”), a mobile phone RF circuit 101, a mobile phone baseband processing unit 102, A television broadcast antenna 203 (hereinafter referred to as “TV antenna”), a television broadcast receiving unit 201, an MPEG decoder 202, a display 110, and a mobile phone transmission control unit 301 are provided.

[0028] When the user station starts a call on a mobile phone, when the user performs a call operation by operating an operation unit (not shown), the mobile phone baseband processing unit 102 stores the caller's phone number information. Based on this, the call start request information is generated, converted into digital data, and output to the mobile phone RF circuit 101. The cellular phone RF circuit 101 generates a quadrature modulated signal by quadrature modulation of the carrier wave with digital data based on the telephone number information, performs predetermined amplification, and transmits the quadrature modulated signal from the telephone antenna 103. When a response signal from the other party is received by the telephone antenna 103 via the base station, the mobile phone RF circuit 101 demodulates it, and the mobile phone baseband processing unit 102 analyzes the response signal and performs a call start process. .

[0029] On the other hand, when the own station receives a call start request information transmission signal from another station, it is demodulated by the mobile phone RF circuit 101, and the response signal is analyzed by the mobile phone baseband processing unit 102 and displayed. Processing such as displaying the other party's telephone number in 110 is performed. Then, if the user performs a call start permission operation in the operation unit, the mobile phone baseband processing unit 102 generates a response signal, converts this response signal into digital data, and outputs it to the mobile phone RF circuit 101. To do. The cellular phone RF circuit 101 orthogonally modulates digital data based on this response signal and transmits it from the telephone antenna 103.

[0030] In this case, the television broadcast receiving unit 201 and the MPEG decoder 202 are set to the OFF state.

[0031] When viewing a television program, when the television antenna 203 receives the digital television broadcast signal Stv, the television broadcast receiving unit 201 demodulates and decodes this signal to obtain a predetermined format. Digital video data of the formula (MPEG format in the case of Fig. 1) is output. The MPEG decoder 202 decodes the input MPEG digital video data, reproduces a video signal and an audio signal, and outputs them to the display 110. The display 110 displays the input video signal on a display screen and outputs sound from a speaker (not shown).

[0032] Here, when the signal is demodulated and decoded, the television broadcast receiving unit 201 indicates whether the signal is being demodulated or decompressed while receiving a television broadcast. The non-reception state detection signal set to “1” is generated and output to the mobile phone transmission control unit 301.

The mobile phone RF circuit 101 and the mobile phone baseband processing unit 102 are set in a standby state. At this time, in the cellular system, in order to notify the base station of the location of the local station, the local station location notification signal is periodically generated and transmitted. For this reason, the mobile phone baseband processing unit 102 generates the burst control signal Sb at a preset slot timing.

[0034] The mobile phone transmission control unit 301 uses the burst control signal Sb input from the mobile phone baseband processing unit 102 and the non-reception state detection signal Sc input from the television broadcast receiving unit 201. The mobile phone RF circuit 101 outputs a transmission control signal Sa.

The mobile phone RF circuit 101 controls transmission of the local position notification signal that has been subjected to digital quadrature modulation based on the transmission control signal Sa output from the mobile phone transmission control unit 301.

[0036] Next, the transmission control method of the local station position notification signal during reception of the above-described television broadcast will be described more specifically.

FIG. 2 is a partial block diagram of the mobile phone with TV according to the present embodiment.

The cellular phone RF circuit 101 includes an orthogonal modulation unit 11 and an RF transmission amplification unit 12, and the cellular phone baseband processing unit 102 includes a modulation signal generation unit 51 and a burst control signal generation unit 52. The television broadcast receiving unit 201 includes an RF receiving unit 21 and a demodulation / decoding unit 22.

[0037] (1) If the mobile phone is in a standby state and receiving a TV broadcast,

The modulation signal generation unit 51 of the mobile phone baseband processing unit 102 generates its own station position notification data at a predetermined slot timing cycle set in advance, and decomposes it into an uncorrelated I component and Q component to perform orthogonal modulation. Output to part 11. Cell phone baseband processor The burst control signal generator 52 of 102 generates and outputs a burst control signal Sb at the same timing cycle as that of the modulation signal generator 51. Here, the burst control signal Sb is a signal for performing output control of each amplifier of the RF transmission amplifying unit 13. This burst control signal Sb is input to the mobile phone transmission control unit 301.

[0038] The mobile phone transmission control unit 301 includes an AND gate 31, and performs a logical product process on the burst control signal Sb having the burst control signal generation unit 52 and the non-reception state detection signal Sc from the television broadcast reception unit 201. Then, the transmission control signal Sa is generated. Here, when the television broadcast is not received, the non-reception state detection signal Sc is always in the “Hi” state, and therefore the transmission control signal Sa is the same as the burst control signal Sb.

The quadrature modulation unit 11 includes a PLL oscillator 13, mixers 14 A and 14 Β, a π Ζ2 phase shift circuit 15, and a synthesizer 16.

[0040] The PLL oscillator 13 generates a reference signal having a predetermined frequency, outputs the reference signal to the mixer 14A, and outputs the reference signal to the mixer 14B via the πΖ2 phase shift circuit 15. In this description, the reference signal is a signal having a carrier frequency. The π Ζ2 phase shift circuit 15 delays the phase of the input signal by π Ζ2 and outputs it. For this reason, the phase of the reference signal input to the mixer 14B is delayed by πΖ2 from the reference signal input to the mixer 14A. The mixer 14A multiplies the input reference signal by the I component of its own station position notification data, performs digital modulation, and outputs the result to the synthesizer 16. The mixer 14B performs digital modulation by multiplying the input π 基準 2 delay reference signal by the Q component of the local position notification data, and outputs the result to the synthesizer 16. The synthesizer 16 adds the signal input from the mixer 14A and the signal input from the mixer 14B, and outputs the digitally modulated local station position notification signal to the RF transmission amplifier 13. This digital modulation method includes the QPSK method and the GMSK method.

The RF transmission amplifying unit 13 includes a driver amplifier 17 and a power amplifier (power amplifier) 18.

[0042] The driver amplifier 17 amplifies the received local station position notification signal to some extent, and the power amplifier 18 further amplifies the local station position notification signal output from the driver amplifier 17 with a relatively high amplification factor. The burst signal is then output and is output to the telephone antenna 103 only during the period when the transmission control signal is “Hi”.

[0043] (2) When the mobile phone is in a standby state and receiving a TV broadcast FIG. 3 is a signal state diagram for explaining the operation of mobile phone transmission control section 301 at the time of receiving a television broadcast. 3A is a signal state diagram of the television broadcast signal Stv, and FIG. 3B is a signal state diagram of the non-reception state detection signal Sc. FIG. 3 (C) is a signal state diagram of the burst control signal Sb, and FIG. 3 (D) is a signal state diagram of the transmission control signal Sa.

The television antenna 203 receives the television broadcast signal Stv transmitted in time division and outputs it to the television broadcast reception unit 201. This television broadcast signal Stv (FIG. 3A) is a digitally modulated broadcast signal, and broadcast data is bursted into pulses having a predetermined time width and transmitted in a predetermined cycle. For example, in the DVB H system scheduled to be implemented in Europe, burst signals with a time width of 200 msec. To 250 msec. Are transmitted at a period of 5.5 sec.

The television broadcast receiving unit 201 includes an RF receiving unit 21 and a demodulation / decoding unit 22.

[0046] The RF receiver 21 down-converts the input television broadcast signal Stv to a predetermined frequency to generate an I component IF signal and a Q component IF signal.

The demodulation / decoding unit 22 demodulates each of the I component IF signal and the Q component IF signal to the baseband, and performs FEC (Forward Error Correction) on these I component baseband signal and Q component baseband signal. Performs decoding processing such as decoding, and generates MPEG format video data.

[0047] The non-reception state detection unit 23 determines whether the burst signal portion of the broadcast data is being received based on the reception state in the RF reception unit 21 or the demodulation in the demodulation * decoding unit 22 and the decoding state. If the signal is not received, it will be in the “Hi” state, and if it is receiving, it will be in the “Low” state, and it will generate a non-reception state detection signal Sc (Fig. Output to AND gate 31 of part 301. The reception status can be detected by detecting whether there is broadcast data at the time when the demodulated signal is played back, or by detecting the carrier wave of the television broadcast signal and checking whether the carrier wave exists. There are detection methods, etc., and select the appropriate method to detect the reception status.

[0048] AND gate 31 of mobile phone transmission control section 301 includes burst control signal Sb (FIG. 3 (C)) from burst control signal generation section 52 and non-reception state detection signal from non-reception state detection section 23. Sc (Fig. 3 (B)) is input and a transmission control signal Sa (Fig. 3 (D)) is output. [0049] Since the transmission control signal Sa is a logical sum output of the burst control signal Sb and the non-reception state detection signal Sc, both the burst control signal Sb and the non-reception state detection signal Sc are in the "Hi" state. Sometimes “Hi” state. On the other hand, the transmission control signal Sa becomes “Low” when the deviation of the burst control signal Sb or the non-reception state detection signal Sc is “Low”.

[0050] When a transmission control signal in the "Hi" state is input, the driver amplifier 17 and the power amplifier 18 of the RF transmission amplification unit 13 amplify the local station position notification signal with a predetermined amplification factor to generate a burst signal, Output to antenna 103.

[0051] By performing such a configuration and processing, burst control of mobile phone communication is performed, and transmission of mobile phone communication is permitted only when a non-reception state of television broadcasting is detected. As a result, it is possible to prevent the local station position notification signal from being transmitted during television reception and preventing the reception of the television broadcast from being interrupted. As a result, a TV-equipped mobile phone can be configured in a small and inexpensive manner without having to include a band rejection filter having a frequency band of cellular phone communication in the input section of the television broadcast receiver 201.

[0052] Since the local station position notification signal is output relatively frequently, even if transmission is sometimes prohibited, the standby function is hardly degraded.

Further, in the description of the present embodiment, the non-reception state detection signal Sc in the “Hi” state when not receiving is used, but the reception state detection signal in the “Low” state when not receiving may be used. . In this case, the same operation as described above can be realized by connecting an inverting element to the reception state detection signal input unit of the AND gate 31 of the cellular phone transmission control unit 301.

Next, a TV-equipped mobile phone according to the second embodiment will be described with reference to FIG. 4 and FIG.

FIG. 4 is a block diagram showing a schematic configuration of the TV-equipped mobile phone according to the present embodiment. FIG. 5 is a partial block diagram of the mobile phone with TV according to the present embodiment.

4 and FIG. 5, the mobile phone with TV shown in FIGS. 1 and 2 omits the mobile phone transmission control unit 301 from the mobile phone with TV shown in FIG. 1 and FIG. The non-reception state detection signal Sc output from the detection unit 23 is input to the transmission control unit 50 of the mobile phone baseband processing unit 102. In the following, description is omitted except for the mobile phone baseband processing unit 102. The mobile phone baseband processing unit 102 includes a modulation signal generating unit 51, a burst control signal generating unit 52, and a transmission control unit 50.

The transmission control unit 50 performs transmission permission control when the non-reception state detection signal Sc is in the “Hi” state, and performs transmission prohibition control when the non-reception state detection signal Sc is in the “Low” state. Specifically, the transmission control unit 50 constantly observes the non-reception state detection signal Sc, and does not perform transmission control on the modulation signal generation unit 51 and the burst control signal generation unit 52 when the “Low” state is detected. On the other hand, when the transmission control unit 50 detects the “Hi” state, the transmission control unit 50 controls the modulation signal generation unit 51 to generate a local position notification signal, which has a slot timing measured separately. Control is performed to cause the burst control signal generator 52 to generate the burst control signal Sb in the “Hi” state, that is, the transmission control signal Sa. The local station position notification signal output from the modulation signal generation unit 51 is digitally modulated by the orthogonal modulation unit 11 and input to the RF transmission amplification unit 13. The burst control signal Sb (transmission control signal Sa) in the “Hi” state output from the burst control signal generation unit 52 is input to each amplifier 17 and 18 of the RF transmission amplification unit 13, and the driver amplifier 17 and the power amplifier 18 are In accordance with the burst control signal Sb in the “Hi” state, the digitally modulated local station position notification signal is amplified and converted into a burst and output to the telephone antenna 103.

[0058] By using such a configuration and processing method as well, since the mobile station's own station location notification signal is not transmitted at the time of receiving a television broadcast, it is possible to prevent interference with the reception of the television broadcast. Furthermore, since the configuration of this embodiment does not require an AND gate as shown in the first embodiment, the device configuration can be further simplified. Furthermore, by performing such transmission control processing in addition to the software processing originally incorporated in the mobile phone baseband processing unit 102, it is possible to receive TV broadcasts with the same element configuration as a conventional mobile phone with TV. It is possible to realize the processing without transmitting the mobile station's own location notification signal during communication!

[0059] Further, by using the configuration and processing method of the present embodiment, the transmission control of the local station notification signal is started when the non-reception state of the television broadcast is detected, so the first embodiment Unlike the case shown in Fig. 1, the slot in mobile phone communication can be used efficiently and effectively. In each of the above-described embodiments, a mobile phone with a TV is shown as an example. However, the above-described configuration is applied to other mobile terminals with a TV adopting a similar communication method! And the above-described effects can be achieved.

Claims

The scope of the claims

[1] In a mobile terminal with a TV equipped with a first communication unit that transmits and receives a first communication signal and a television broadcast signal reception unit that receives video in a time division manner,

A TV comprising: a non-reception state detection unit that detects a non-reception state of the television broadcast signal; and a transmission control unit that performs communication permission control of the first communication unit based on a non-reception state detection result. Mobile terminal.

2. The mobile terminal with TV according to claim 1, wherein the transmission control means performs the communication permission control by output control of a power amplifier of an RF transmission signal of the first communication unit.

3. The mobile terminal with TV according to claim 2, wherein the transmission control means is a logical product circuit of a steady output control signal for the power amplifier and a signal indicating the non-reception state.

4. The mobile terminal with TV according to claim 1, wherein the transmission control means performs the communication permission control in a transmission start process in a baseband processing unit of an RF transmission signal of the first communication unit.

[5] The non-reception state detecting means detects the non-reception state based on a demodulated signal of the television broadcast signal receiving unit. A moving terminal.