Digital broadcasting apparatus

A technology of digital broadcasting and broadcasting frequency, applied in broadcasting transmission systems, digital transmission systems, modulated carrier systems, etc., it can solve the problems of high probability of peaks and difficulty in ensuring the dynamic range of front-end amplifiers in receivers

Inactive Publication Date: 2002-04-17
SONY CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, from the perspective of the entire signal in the channel, there is a disadvantage in that there are multiple groups of carriers with the same phase, so there is a high probability of generating peaks in the transmitted signal, and it is difficult to ensure the dynamic range of the front-end amplifier in the receiver

Method used

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no. 1 Embodiment

[0024] FIG. 1 is a circuit diagram of a first embodiment of the digital broadcasting apparatus of the present invention.

[0025] As shown in the figure, the digital broadcasting device of this embodiment includes: a broadcast signal processing circuit 100 for processing a segment of a broadcast signal, an inverse Fourier transform circuit (IFFT) 12, a guard interval additional circuit 13, a quadrature modulation circuit 14, a frequency conversion Circuit 15 , RF (Radio Rrequency, radio frequency) signal oscillation circuit 16 , high frequency amplifier circuit 17 , transmitting antenna 18 and control circuit 20 .

[0026] Hereinafter, each partial circuit constituting the digital broadcasting apparatus of this embodiment will be described.

[0027] As shown in the figure, the broadcast signal processing circuit 100 includes: a multiplexing circuit 1, an outer encoding circuit 2, an energy dispersal circuit 3, a delay correction circuit 4, a byte interleaving circuit 5, a conv...

no. 2 Embodiment

[0064] Fig. 4 is a circuit diagram of a second embodiment of the digital broadcasting apparatus of the present invention.

[0065] In the first embodiment of the present invention described above, the broadcast signal processing circuit 100 basically performs one-segment broadcast signal processing. However, the digital broadcasting apparatus of the present invention is not limited to one segment, and multiple narrowband ISDB-T signals may be modulated together. In this case, circuits of various stages after the inverse Fourier transform circuit 12 may be shared by a plurality of narrowband ISDB-T signals. This embodiment is constructed based on this.

[0066] As shown in Figure 4, the digital broadcasting device of this embodiment includes: broadcast signal processing circuits 100, 101, 102, multiplexing circuit (MUX) 110, inverse Fourier transform circuit (IFFT) 12, guard interval additional circuit 13, Quadrature modulation circuit 14 , frequency conversion circuit 15 , R...

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Abstract

A digital broadcasting apparatus in which the phase of the carrier of the signal of a digital terrestrial broadcasting is controlled depending on the frequency of its transmission channel so as to suppress an increase of the dynamic range of the signal. A frequency interleaving circuit interleaves the frequency of the main signal generated according to audio data with a parameter determined according to the frequency of the transmission channel, and a sub-signal generating circuit generates a sub-signal including a pilot signal for transmission control. A mapping circuit modulates the sub-signal by using a pseudo-random number sequence produced according to the initial value of the random number code preset according to the frequency of the transmission channel. The frequency-interleaved main signal and the modulated sub-signal are subjected to OFDM modulation. After the frequency is converted to the frequency of the transmission channel, the signal is radiated from an antenna, thus suppressing an increase of the dynamic range of the broadcasting signal.

Description

technical field [0001] The present invention relates to a digital broadcasting device, in particular to a broadcasting device in terrestrial digital sound broadcasting. Background technique [0002] As tentative schemes for terrestrial digital television broadcasting and terrestrial digital audio broadcasting, broadcasting schemes called a wideband ISDB-T scheme and a narrowband ISDB-T scheme have been proposed. These broadcasting methods are matched with each other. In the bandwidth (about 429kHz) obtained by dividing the 6MHz frequency band allocated to TV channels in Japan into 14 parts, an OFDM (Orthogonal Frequency Division Multiplexing, Orthogonal Frequency Division Multiplexing, called a segment) is formed. The basic transmission unit modulated with ), which is used for terrestrial digital television broadcasting or terrestrial digital sound broadcasting. [0003] The signal of the segment is OFDM modulated, and the OFDM carrier of the segment is defined as 108, 216,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04H20/72H04L27/26
CPCH04L27/2618H04H20/72H04B2201/70706
Inventor 池田康成百代俊久冈田隆宏池田保黑田彻居相直彦土田健一佐佐木诚
Owner SONY CORP
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