JP3003614B2 - Satellite broadcast receiving system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a satellite broadcast receiving system, and more particularly to a method of transmitting an analog audio signal from a television receiver, an audio device, or the like to speakers, headphones, or the like, which are arranged at distant points.

[0002]

2. Description of the Related Art Conventionally, as a method of transmitting an analog audio signal from a television receiver (hereinafter, referred to as a television) or an audio device to an operator or the like, a speaker, headphones, or the like disposed at a distant point is used. Is generally transmitted to an operator or the like.

In this case, a signal line is connected between a television, an audio device, and the like, and a speaker, a headphone, and the like. On the other hand, a method of transmitting an analog audio signal from a television, an audio device, or the like to a speaker, a headphone, or the like using radio or infrared has been performed.

Devices using these methods convert analog audio signals into FM (Frequency Modulatio) signals.
n) Modulation is performed by a modulation method, and radio transmission or infrared transmission is performed to a speaker or a wireless headphone using a high-frequency carrier. In a speaker or a wireless headphone, a signal transmitted by radio or infrared through a receiver is reproduced as an analog signal.

[0005]

In the conventional analog audio signal transmission method described above, an analog modulation / demodulation method represented by FM modulation is adopted as a modulation / demodulation method.
The quality of the received audio signal is degraded according to the transmission distance, especially the SN ratio (Signal to Noise ratio).
o) is degraded.

Further, in the above-mentioned transmission method, since the noise of the analog modulation / demodulation circuit itself is present, it affects the modulated signal and causes a problem when a high-quality audio signal is transmitted wirelessly including infrared transmission. .

Therefore, an object of the present invention is to solve the above-mentioned problems, and to transmit a high-quality audio signal to a remote place without causing a problem in wirelessly transmitting a high-quality audio signal. It is to provide a satellite broadcast receiving system.

[0008]

A satellite broadcast receiving system according to the present invention comprises: a satellite broadcast receiving circuit for receiving a satellite broadcast for broadcasting to an unspecified receiver via an artificial satellite; An encoding circuit that encodes with the encoding / decoding method used for: a selection circuit that selects one of an output of the satellite broadcast reception circuit and an output of the encoding circuit; and an output circuit that is selected by the selection circuit. A transmitting device including a modulating circuit for performing modulation and a transmitting circuit for transmitting an output of the modulating circuit is provided, and an audio signal is wirelessly transmitted to a receiving device located at a position distant from the transmitting device.

[0009]

[0010] Another satellite broadcast receiving system according to the present invention is a satellite broadcast receiving circuit for receiving a satellite broadcast for broadcasting to an unspecified receiver via an artificial satellite, and a code for using an analog audio signal for the satellite broadcast. A coding circuit for coding in a decoding system, a selection circuit for selecting one of the output of the satellite broadcast receiving circuit and the output of the coding circuit, and a modulation for modulating the output selected by the selection circuit Circuit and
A transmission device including a transmission circuit that transmits an output of the modulation circuit, a reception circuit that receives a modulation signal transmitted from the transmission circuit, a demodulation circuit that demodulates a modulation signal received by the reception circuit, A decoding circuit that decodes the signal demodulated by the demodulation circuit by the code decoding method, and a receiving device including a conversion circuit that converts the signal decoded by the decoding circuit into an analog audio signal and outputs the analog audio signal. It has.

That is, the satellite broadcast receiving system according to the present invention comprises a BS (Broadcasting Satellite).
te) broadcasting and CS (Communications S)
satellite broadcast receiver represented by atelelite broadcasting and audio PCM (PulseCode Modulati).
on) It is composed of two receiving devices.

The satellite broadcast receiver includes a satellite broadcast receiving circuit and B
A BS audio PCM encoder for encoding based on an audio PCM transmission method used for S broadcast (hereinafter referred to as a BS audio PCM transmission method), and a bit rate of 2.048 Mbps output from a satellite broadcast receiving circuit. 1. A bit transmission rate at which a first bit stream signal sequence and a plurality of analog audio signals input from an input terminal of a satellite broadcast receiver are obtained through a BS audio PCM encoder.
One of the 048 Mbps second bit stream signal sequence is selected by a switch.

Further, the satellite broadcast receiver generates a first bit synchronization clock required for performing digital modulation from the bit stream signal sequence selected by the switch.
PLL (Phase Locked Loop) circuit, a sum conversion circuit necessary for performing differential phase modulation from a digital signal sequence, and a QPSK (Quadratu) for performing digital modulation from a signal obtained from the sum conversion circuit.
re-Phase Shift Keying) modulation circuit, a first frequency conversion circuit, a high-frequency amplifier circuit, and a transmission antenna necessary for transmitting the obtained QPSK modulation signal.

On the other hand, the audio PCM receiving apparatus includes a receiving antenna and a high-frequency receiving circuit for receiving the high-frequency digital modulation signal transmitted from the satellite broadcasting receiver, and converts the received high-frequency digital modulation signal into a digital modulation signal of an arbitrary frequency. A second frequency conversion circuit to be converted, and a signal obtained from the second frequency conversion circuit [hereinafter, IF (Inte
a digital frequency modulation signal), a QPSK demodulation circuit for performing digital demodulation, a difference conversion circuit required for performing differential phase demodulation from a digital signal obtained from the QPSK demodulation circuit,
A second PLL circuit for generating a bit synchronization clock, and the BS sound P from the signal sequence obtained from the difference conversion circuit.
A BS audio PCM decoder that performs decoding based on the CM transmission system, and a D / A (Digi) that outputs an analog audio signal.
tal / Analog) converter, and wirelessly transmits the audio signal to a remote point.

The first PLL circuit, the sum conversion circuit, the QPSK modulation circuit, the first frequency conversion circuit, the high frequency amplification circuit, the transmission antenna, and the audio PCM of the above-mentioned satellite broadcast receiver.
A receiving antenna, a high-frequency receiving circuit, a second frequency converting circuit, a QPSK demodulating circuit, a differential converting circuit, and a second PLL circuit of a receiving device are connected to a specific stream using a bit stream signal sequence selected by a switch as a modulated signal. An FM modulation circuit for performing modulation by a carrier frequency FM modulation method,
This FM modulation signal is transmitted to an infrared LED (LightEmit
LED driving circuit for converting an optical FM modulation signal into an electric signal using a Ting Diode, a photoelectric conversion circuit for converting a received optical FM modulation signal into an electric signal, and an FM demodulation circuit for demodulating an FM modulation signal obtained from the photoelectric conversion circuit. A method of transmitting an audio signal to a remote point by infrared rays can be considered.

By adopting a digital transmission format based on the BS audio PCM transmission system for the transmission of the audio signal, it is possible to correct an error, which is a characteristic of the digital system. It is possible to faithfully transmit an audio signal without causing deterioration.

[0017]

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing a configuration of a satellite broadcast receiving system according to an embodiment of the present invention.
FIG. 2 is a block diagram showing a system configuration of the satellite broadcast receiving system according to one embodiment of the present invention. In these figures, a satellite broadcast receiving system 3 according to an embodiment of the present invention is shown.
Is a satellite broadcast receiver 1 and audio PCM (Pulse Code)
e Modulation) receiving device 2.

The satellite broadcast receiver 1 includes a satellite broadcast receiving circuit 10
, An A / D (Analog / Digital) conversion circuit 11, and a BS (Broadcasting Satellite)
lite) Audio PCM encoder 12 and switch 13
, The sum conversion circuit 14, and a PLL (Phase Loc).
ked loop) circuit 15 and a QPSK (Quadr).
atture Phase Shift Keying)
It comprises a modulation circuit 16, a frequency conversion circuit 17, a high-frequency amplification circuit 18, and a transmission antenna 19.

The voice PCM receiving apparatus 2 includes a receiving antenna 21, a high-frequency receiving circuit 22, and a frequency converting circuit 23.
, A QPSK demodulation circuit 24, a difference conversion circuit 25,
LL circuit 26, BS audio PCM decoder 27, D /
A (Digital / Analog) converter 28.

The satellite broadcast receiving circuit 10 of the satellite broadcast receiver 1
Is BS broadcasting and CS (Communications S
satellite broadcast typified by atelelite broadcast, and outputs to the switch 13 a first bit stream signal sequence having a bit transmission rate of 2.048 × nMbps (n is a positive integer).

The A / D conversion circuit 11 digitizes an analog audio signal input from a video device (not shown) or a television receiver (hereinafter, referred to as a television) (not shown) to convert the analog audio signal into a BS audio PCM encoder 12. Output to BS
The audio PCM encoder 12 encodes the audio signal digitized by the A / D conversion circuit 11 based on an audio PCM transmission system used for BS broadcasting (hereinafter, referred to as a BS audio PCM transmission system). The BS audio PCM encoder 12 obtains 2.048 × nMbps (n
(A positive integer) is output to the switch 13.

The switch 13 selects one of the first bit stream signal sequence from the satellite broadcast receiving circuit 10 and the second bit stream signal sequence from the BS audio PCM encoder 12, and selects the selected bit stream signal. The series is output to the sum conversion circuit 14 and the PLL circuit 15.

The sum conversion circuit 14 performs differential phase modulation from the bit stream signal sequence selected by the switch 13. The PLL circuit 15 generates a bit synchronization clock necessary for performing digital modulation from the bit stream signal sequence selected by the switch 13.

The QPSK modulation circuit 16 is a sum conversion circuit 15
Performs digital modulation on the signal obtained from. The frequency conversion circuit 17 performs frequency conversion to transmit the QPSK modulated signal obtained from the QPSK modulation circuit 16. The high-frequency amplifier 18 amplifies the signal whose frequency has been converted by the frequency converter 17, and the transmission antenna 19 transmits the signal amplified by the high-frequency amplifier 18 to the voice PCM receiver 2.

The receiving antenna 21 of the voice PCM receiving apparatus 2
The high-frequency receiving circuit 22 receives the high-frequency digital modulation signal transmitted from the satellite broadcast receiver 1. The frequency conversion circuit 23 converts the high-frequency digital modulation signal received by the reception antenna 21 and the high-frequency reception circuit 22 into a digital modulation signal of an arbitrary frequency. The QPSK demodulation circuit 24 outputs a signal obtained from the frequency conversion circuit 23 [hereinafter, IF (Int)
digital frequency demodulation signal).

The difference conversion circuit 25 is a QPSK demodulation circuit 24
Performs differential phase demodulation on the digital signal obtained from.
The PLL circuit 26 generates a bit synchronization clock necessary for the differential conversion circuit 25 to perform differential phase demodulation. The BS audio PCM decoder 27 decodes the signal sequence obtained from the difference conversion circuit 25 based on the BS audio PCM transmission method. The D / A conversion circuit 28 converts the signal (digital signal) decoded by the BS audio PCM decoder 27 into an analog audio signal and outputs it.

In this case, by incorporating the audio PCM receiving device 2 into a headphone or speaker (not shown), an analog audio signal from a video device or a television can be wirelessly transmitted to a remote location. Therefore, high-quality audio signals can be transmitted without problems even when they are arranged at a distance from each other, such as between a video device or a television and headphones or speakers. Signals can be transmitted.

FIG. 3 is a block diagram showing a configuration of the sum conversion circuit 14 of FIG. In the figure, the sum conversion circuit 14 includes a serial / parallel conversion circuit 14a and a MOD (MOD
ulo) 2 adder 14b and MOD4 adder 14c
, One-clock delay circuit 14d, MOD4 adder 14
e.

FIG. 4 is a block diagram showing a configuration of the QPSK modulation circuit 16 of FIG. In the figure, a QPSK modulation circuit 16 includes multipliers 16a and 16b and a 90-degree phase circuit 16
c, a carrier signal generator 16d, and an adder 16e.

FIG. 5 is a block diagram showing the configuration of the QPSK demodulation circuit 24 of FIG. In the figure, a QPSK demodulation circuit 24 includes multipliers 24a and 24b and a 90-degree phase circuit 24.
c, a reproduced carrier signal generator 24d, and a low pass filter (LPF: Low Pass Filter) 24
e, 24f.

The operation of the satellite broadcast receiving system 3 according to one embodiment of the present invention, that is, the satellite broadcast receiver 1 and the audio PCM receiving device 2 will be described with reference to FIGS.

The satellite broadcast receiving circuit 10 of the satellite broadcast receiver 1
Is an audio PC that receives BS and CS broadcasts and has an analog video signal and a bit rate of 2.048 Mbps.
And a bit stream for M.

The A / D conversion circuit 11 digitizes a plurality of analog audio signals input from an external audio input terminal (not shown) of the satellite broadcast receiver 1 and outputs them to the BS audio PCM encoder 12. BS audio PCM encoder 12
Converts the audio signal digitized by the A / D conversion circuit 11 into 2.048 × n based on the BS audio PCM transmission system.
Output as a Mbps bit stream. The switch 13 selects one of these two bit streams and outputs the selected bit stream to a sum conversion circuit 14 required for four-phase differential phase modulation and a PLL circuit 15 for generating a bit synchronization clock.

The sum conversion circuit 14 performs differential phase modulation on the bit stream signal sequence selected by the switch 13 and converts the two signal sequences (I signal and Q signal) to the next QP signal sequence.
Output to the SK modulation circuit 16. The QPSK modulation circuit 16 obtains an IF digital modulation signal having a specific carrier frequency.

The IF digital modulation signal obtained by the QPSK modulation circuit 16 is input to a frequency conversion circuit 17 and is converted by the frequency conversion circuit 17 into a specific frequency band for wireless transmission. The output signal of the frequency conversion circuit 17 is further guided to the transmission antenna 19 via the high frequency amplification circuit 18. As the electric field strength of the radio wave emitted from the transmitting antenna 19, for example, an electric field strength specified by a weak radio station according to the Radio Law may be used.

Receiving antenna 21 of voice PCM receiving apparatus 2
Receives the radio wave transmitted from the transmission antenna 19 and outputs it to the frequency conversion circuit 23 via the high frequency reception circuit 22.
The frequency conversion circuit 23 converts a signal from the high-frequency reception circuit 22 into an IF digital modulation signal, similarly to the satellite broadcast receiver 1. The IF digital modulation signal is input to the QPSK demodulation circuit 24, where the QPSK demodulation circuit 24 performs QPSK demodulation.

In the QPSK demodulation circuit 24, like the satellite broadcast receiver 1, two demodulated signals, that is, an I signal and a Q signal are obtained. These I signal and Q signal are input to a difference conversion circuit 25 at the next stage necessary for differential phase demodulation, and the differential conversion circuit 25 performs four-phase differential phase demodulation. Also, PL
The L circuit 26 generates a bit synchronization clock from one of the I signal and the Q signal, and outputs the bit synchronization clock to the difference conversion circuit 25 and the BS audio PCM decoder 27.

The BS audio PCM decoder 27 is a general decoder based on the BS audio PCM transmission system used in the satellite broadcast receiver 1 described above. A specific bit width obtained from the BS audio PCM decoder 27, for example, 1
The 4-bit to 16-bit digital audio signal is converted into analog audio by a D / A conversion circuit 28 at the subsequent stage and output.

With the above operation, the satellite broadcast receiver 1
A plurality of audio signals can be wirelessly transmitted as digital signals from to the audio PCM receiving apparatus 2. here,
In the above description, an example of transmission / reception by radio waves has been described, but the 2.048 × nMb of the satellite broadcast receiver 1 has
A bit stream signal having a bit transmission rate of ps is transmitted through an infrared LED (not shown) to the audio PCM receiving apparatus 2.
, And can be received by the audio PCM receiving apparatus 2 using a light receiving element (not shown) such as a pin photodiode.

FIG. 6 is a block diagram showing the configuration of a satellite broadcast receiving system according to another embodiment of the present invention. In the figure, a satellite broadcast receiving system according to one embodiment of the present invention includes a satellite broadcast receiver 4 and an audio PCM receiving device 5.

The satellite broadcast receiver 4 includes a sum conversion circuit 14, a PLL circuit 15, and a QPS of the above-described satellite broadcast receiver 1.
The K modulation circuit 16, the frequency conversion circuit 17, the high frequency amplification circuit 18, and the transmission antenna 19 are connected to the FM modulation circuit 41
And LED (Light Emitting Diode)
e) The configuration is the same as that of the satellite broadcast receiver 1 except that the drive circuit 42 is replaced.

The voice PCM receiving device 5 includes the receiving antenna 21, the high frequency receiving circuit 22, the frequency converting circuit 23, the QPSK demodulating circuit 24, the difference converting circuit 25, the PLL circuit 26 was replaced by a photoelectric conversion circuit 51 and an FM demodulation circuit 52.
The configuration is the same as that of the voice PCM receiving device 2 described above.

The FM modulation circuit 41 of the satellite broadcast receiver 4 uses the bit stream signal sequence selected by the switch 13 as a signal to be modulated, and modulates the FM of a specific carrier frequency.
Modulation is performed by a modulation method. LED drive circuit 42
Converts the FM modulation signal modulated by the FM modulation circuit 41 into an optical FM modulation signal using an infrared LED.

The photoelectric conversion circuit 51 of the audio PCM receiving apparatus 5
Converts an optical FM modulation signal received using a light receiving element into an electric signal. The FM demodulation circuit 52 demodulates the FM modulation signal obtained from the photoelectric conversion circuit 51 and converts the demodulated signal to the BS audio PCM decoder 2.
7 is output.

Satellite broadcast receiver 4 and audio PCM receiver 5
With the above configuration, if the audio PCM receiving device 5 is built in headphones or speakers (not shown),
An analog audio signal from a video device or a television can be transmitted by infrared to a remote location. Therefore, high-quality audio signals can be transmitted without problems even when they are arranged at a distance from each other, such as between a video device or a television and headphones or speakers. Signals can be transmitted.

As described above, by adopting the digital transmission format based on the BS audio PCM transmission system for the transmission of the audio signal, error correction which is a characteristic of the digital system can be performed. It is possible to faithfully transmit the audio signal without deteriorating the quality between them.

As described above, the satellite broadcast receivers 1 and 4 include a satellite broadcast receiving circuit 10 for receiving a satellite broadcast for broadcasting to an unspecified receiver via an artificial satellite, and an A for digitizing an analog audio signal. A / D conversion circuit 11, a BS audio PCM encoder 12 for encoding the audio signal digitized by the A / D conversion circuit 11 by an encoding / decoding method used for satellite broadcasting, an output of the satellite broadcasting receiving circuit 10, A switch 13 for selecting one of the outputs of the audio PCM encoder 12; a sum conversion circuit 14, a PLL circuit 15, a QPSK modulation circuit 16 or an FM modulation circuit 41 for modulating the output selected by the switch 13; And a frequency conversion circuit 17, a high-frequency amplification circuit 18, a transmission antenna 19 or an LED drive circuit 42 for transmitting the output. The receiving antennas 21, the high-frequency receiving circuit 22, the frequency converting circuit 23 or the photoelectric converting circuit 51 for receiving the transmitted modulated signal, the QPSK demodulating circuit 24 for demodulating the received modulated signal, and the differential converting circuit 25 , PLL circuit 26 or FM demodulation circuit 52, and BS audio PCM decoder 27 for decoding the demodulated signal.
And a D / A conversion circuit 28 that converts the decoded signal into an analog audio signal and outputs the analog audio signal, so that a digital signal transmission means is used as a wireless transmission method of the audio signal to a remote point. Therefore, it is possible to transmit a high-quality audio signal to a remote location without causing a problem in wirelessly transmitting a high-quality audio signal.

Since the transmission system of the digitized audio signal is based on the general BS audio PCM transmission system, the BS audio PCM of the audio PCM receiving devices 2 and 5 is provided.
As the decoder 27, a general-purpose LSI mounted on a current satellite broadcast receiver can be used, and a transmission / reception unit can be realized relatively inexpensively and easily.

[0049]

As described above, according to the present invention, a transmitting apparatus is provided with a satellite broadcast receiving circuit for receiving a satellite broadcast for broadcasting to an unspecified receiver via an artificial satellite, A coding circuit for coding by a coding / decoding system used for broadcasting, a selection circuit for selecting one of an output of the satellite broadcast receiving circuit and an output of the coding circuit, and a modulation of the output selected by the selection circuit. A receiving circuit that receives a modulated signal transmitted from the transmitting circuit, and a demodulating circuit that demodulates the modulated signal received by the receiving circuit. A decoding circuit that decodes the signal demodulated by the demodulation circuit by a code decoding method, and a conversion circuit that converts the signal decoded by the decoding circuit into an analog audio signal and outputs the analog audio signal. high quality Without causing the problem of wireless transmission voice signal, there is an effect that it is possible to transmit high-quality audio signals at a distant point.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a satellite broadcast receiving system according to one embodiment of the present invention.

FIG. 2 is a block diagram showing a system configuration of a satellite broadcast receiving system according to one embodiment of the present invention.

FIG. 3 is a block diagram illustrating a configuration of a sum conversion circuit of FIG. 1;

FIG. 4 is a block diagram illustrating a configuration of a QPSK modulation circuit in FIG. 1;

FIG. 5 is a block diagram illustrating a configuration of a QPSK demodulation circuit in FIG. 1;

FIG. 6 is a block diagram showing a configuration of a satellite broadcast receiving system according to another embodiment of the present invention.

[Explanation of symbols]

 1, 4 satellite broadcast receiver 2, 5 audio PCM receiving device 3 satellite broadcast receiving system 10 satellite broadcast receiving circuit 11 A / D conversion circuit 12 BS audio PCM encoder 13 switch 14 summation conversion circuit 15 PLL circuit 16 QPSK modulation circuit 17 Frequency conversion circuit 18 High frequency amplification circuit 19 Transmission antenna 21 Receiving antenna 22 High frequency reception circuit 23 Frequency conversion circuit 24 QPSK demodulation circuit 25 Difference conversion circuit 26 PLL circuit 27 BS audio PCM decoder 28 D / A converter 41 FM modulation circuit 42 LED drive Circuit 51 Photoelectric conversion circuit 52 FM demodulation circuit

Claims (8)

(57) [Claims] 1. A satellite broadcast receiving circuit for receiving a satellite broadcast for broadcasting to an unspecified receiver via an artificial satellite, and encoding for encoding an analog audio signal by a code decoding method used for the satellite broadcast. Circuit, a selection circuit that selects one of the output of the satellite broadcast reception circuit and the output of the encoding circuit, a modulation circuit that modulates the output selected by the selection circuit, and an output of the modulation circuit. A satellite broadcast receiving system, comprising: a transmitting device including a transmitting circuit for transmitting, and wirelessly transmitting an audio signal to a receiving device located at a position distant from the transmitting device. 2. Broadcasting to an unspecified receiver via an artificial satellite
A satellite broadcast receiving circuit for receiving satellite broadcasts, and an analog
Encoding and decoding system used for satellite broadcasting of audio signals
And a coding circuit for coding at the output of the satellite broadcast receiving circuit.
Selection to select one of a power and an output of the encoding circuit.
A circuit for modulating the output selected by the selection circuit.
And a transmission circuit for transmitting the output of the modulation circuit.
And a receiving circuit for receiving a modulated signal transmitted from the transmitting circuit.
And a demodulator for demodulating the modulated signal received by the receiving circuit.
A demodulation circuit and a signal demodulated by the demodulation circuit.
A decoding circuit for decoding in an encoding system;
Converts the decoded signal to an analog audio signal and outputs
And a receiving device comprising a converting circuit.
Satellite broadcast receiving system. 3. The code decoding method according to claim 1, wherein at least BS
The audio PCM transmission system used for satellite broadcasting
3. The method according to claim 1, wherein
The satellite broadcast receiving system as described. 4. The satellite broadcast receiving circuit and the encoding circuit
The path is 2.048 Mbps × n (n is a positive integer) bit.
It is configured to output a signal of transmission speed
The satellite broadcast receiver according to any one of claims 1 to 3,
Shin system. 5. The transmitting device according to claim 1, wherein the transmitting device converts the audio signal into a differential signal.
It is characterized in that it is configured to transmit by phase modulation and wireless
The satellite broadcast receiver according to any one of claims 1 to 4,
Shin system. 6. The receiving device according to claim 1 , wherein
It is characterized in that it is configured to perform differential phase demodulation of audio signals.
The satellite broadcast receiver according to any one of claims 1 to 4,
Shin system. 7. The transmitting device according to claim 1, wherein the transmitting device converts the audio signal into an FM signal.
And transmit it by infrared.
The satellite broadcast reception according to any one of claims 1 to 4,
system. 8. The receiving apparatus according to claim 1, wherein said receiving apparatus is configured to receive an infrared ray before receiving the infrared ray.
Wherein the voice signal is FM-demodulated.
The satellite broadcast reception according to any one of claims 1 to 4,
system.