IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0783588
(2004-02-23)
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등록번호 |
US-RE39927
(2007-11-27)
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우선권정보 |
JP-3-62798(1991-03-27); JP-3-95813(1991-04-25); JP-3-155650(1991-05-29); JP-3-182236(1991-07-23); JP-4-60739(1992-03-17); JP-5-132984(1993-05-10); JP-5-261612(1993-09-24); JP-5-349972(1993-12-27); JP-6-79668(1994-03-24) |
발명자
/ 주소 |
- Oshima,Mitsuaki
- Sakashita,Seiji
|
출원인 / 주소 |
- Matsushita Electric Industrial Co., Ltd.
|
대리인 / 주소 |
Wenderoth, Lind & Ponack, L.L.P.
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인용정보 |
피인용 횟수 :
0 인용 특허 :
89 |
초록
▼
At the transmitter side, carrier waves are modulated according to an input signal for producing relevant signal points in a signal space diagram. The input signal is divided into, two, first and second, data streams. The signal points are divided into signal point groups to which data of the first d
At the transmitter side, carrier waves are modulated according to an input signal for producing relevant signal points in a signal space diagram. The input signal is divided into, two, first and second, data streams. The signal points are divided into signal point groups to which data of the first data stream are assigned. Also, data of the second data stream are assigned to the signal points of each signal point group. A difference in the transmission error rate between first and second data streams is developed by shifting the signal points to other positions in the space diagram expressed at least in the polar coordinate system. At the receiver side, the first and/or second data streams can be reconstructed from a received signal. In TV broadcast service, a TV signal is divided by a transmitter into low and high frequency band components which are designated as first and second data streams respectively. Upon receiving the TV signal, a receiver can reproduce only the low frequency band component or both the low and high frequency band components, depending on its capability. Furthermore, a communication system based on an OFDM system is utilized for data transmission of a plurality of subchannels, wherein the subchannels are differentiated by changing the length of a guard time slot or a carrier wave interval of a symbol transmission time slot, or changing the transmission electric power of the carrier.
대표청구항
▼
What is claimed is: id="DEL-S-00192" date="20071127" 1. A signal transmission and reception apparatus for transmitting and receiving an n-level VSB signal, the apparatus comprising a transmitter and a receiver; said transmitter comprising: a compression means for compressing an input video signal t
What is claimed is: id="DEL-S-00192" date="20071127" 1. A signal transmission and reception apparatus for transmitting and receiving an n-level VSB signal, the apparatus comprising a transmitter and a receiver; said transmitter comprising: a compression means for compressing an input video signal to a digital video compression signal; an error correction encoding means for adding an error correction code to the digital video compression signal to produce an error correction coded signal; a modulation means for modulating the error correction coded signal to an n-level VSB modulation signal, said modulation means comprising a means for allocating code points along a uniaxial modulation coordinate system, and a filter means having a plurality of coefficients which are a series of impulse responses defined by plotting timebase responses to the VSB modulation signal along the in-phase axis and its orthogonal axis for filtering a series of said code points allocated along the uniaxial modulation coordinate system; and a transmission means for transmitting the modulation signal, and said receiver comprising: a means for receiving a transmitted n-level VSB modulation signal; a demodulation means for demodulating the received n-level VSB modulation signal into a digital reception signal; an error correction means for error correcting the digital reception signal to obtain an error-corrected digital signal; and an expanded means for expanding the error-corrected digital signal to obtain a video output signal.id="DEL-S-00192" id="DEL-S-00193" date="20071127" 2. A transmission and reception apparatus according to claim 1, wherein the error correction means comprises a trellis decoder.id="DEL-S-00193" id="DEL-S-00194" date="20071127" 3. A transmission and reception apparatus according to claim 2, wherein the trellis decoder is associated with a plurality of memories which each holds a number of selectable correct codes.id="DEL-S-00194" id="DEL-S-00195" date="20071127" 4. A transmission and reception apparatus according to claim 1, wherein the digital reception signal is divided into a high priority signal and a low priority signal, and wherein said error correction means comprises a high code gain first error correction means and a low code gain second error correction means, said first error correction means correcting the high priority signal.id="DEL-S-00195" id="DEL-S-00196" date="20071127" 5. A transmission and reception apparatus according to claim 4, wherein the high priority signal carries the address data for all data.id="DEL-S-00196" id="DEL-S-00197" date="20071127" 6. A transmission and reception apparatus according to claim 4, wherein the first error correction means comprises a trellis decoder.id="DEL-S-00197" id="DEL-S-00198" date="20071127" 7. A signal transmission and reception apparatus according to claim 1, further comprising a band path filtering means for filtering the n-level VSB modulation signal before being transmitted.id="DEL-S-00198" id="DEL-S-00199" date="20071127" 8. A signal transmission and reception apparatus for transmitting an n-level VSB signal, comprising: a compression means for compressing an input video signal into a digital video compression signal; an error correction encoding means for adding an error correction code to the digital video compression signal to produce an error correction coded signal; a modulation means for modulating the error correction coded signal to an n-level VSB modulation signal, said modulation means comprising a means for allocating code points along a uniaxial modulation coordinate system, and a filter means having a plurality of coefficients which are a series of impulse responses defined by plotting timebase responses to the VSB modulation signal along the in-phase axis and its orthogonal axis for filtering a series of said code points allocated along the uniaxial modulation coordinate system; and a transmission means for transmitting the modulation signal.id="DEL-S-00199" id="DEL-S-00200" date="20071127" 9. A signal transmission apparatus according to claim 8, further comprising a band path filtering means for filtering the n-level VSB modulation signal before being transmitted.id="DEL-S-00200" id="DEL-S-00201" date="20071127" 10. A signal receiving apparatus comprising: a tuner for receiving a transmission signal containing a digital modulation signal and an analog modulation signal and for selecting the digital modulation signal using a local oscillation signal; an interference detecting means for detecting interference caused by the analog modulation signal from the digital modulation signal selected by the tuner; a notch filter means responsive to the interference detected by the interference detecting means for removing a carrier of the analog modulation signal in a same frequency band as a frequency band of the digital modulation signal; an error ratio calculating means for calculating a bit error ratio of an output of the notch filter means; and an automatic frequency correcting means for changing a frequency of the local oscillation signal of the tuner according to a level of the interference detected by the interference detecting means and the bit error ratio calculated by the error ratio calculating means to compensate for a frequency offset of the carrier of the analog modulated signal.id="DEL-S-00201" id="DEL-S-00202" date="20071127" 11. A signal receiving apparatus according to claim 10, wherein the digital modulation signal is an n-level VSB modulation signal.id="DEL-S-00202" id="DEL-S-00203" date="20071127" 12. A signal receiving apparatus comprising: a tuner for receiving a transmission signal containing at least one of a VSB modulated signal and a QAM modulated signal and for selecting one of the VSB modulated signal and the QAM modulated signal to obtain a selected signal; an analog-to-digital converter for converting the selected signal into a series of digital codes; a transversal filter provided on an orthogonal axis for suppressing a transmission distortion of the series of digital codes with respect to both orthogonal axes to obtain a series of filtered digital codes allocated on the orthogonal axes; a carrier recovery means for phase-compensating a carrier of the filtered digital codes allocated on the orthogonal axis outputted from the transversal filter; and a control means for producing a control signal to extract detected codes at equal time intervals from the VSB modulated signal; a clock reproducing means for phase synchronizing entire codes of the QAM modulated signal where the selected signal is the QAM modulated signal and for phase synchronizing codes of the VSB modulated signal intermittently at predetermined intervals when the selected signal is the VSB modulated signal; and a decoding means for decoding an output of the carrier recovery means.id="DEL-S-00203" id="INS-S-00197" date="20071127" 13. A signal transmission system comprising a transmission apparatus and a receiving apparatus, said transmission apparatus comprising: a mapper operable to map a data stream to produce a mapped signal; a selector operable to select between tap coefficients for a VSB modulation mode and tap coefficients for a QAM modulation mode; first and second FIR filters operable to filter the mapped signal to produce a VSB modulated signal when said selector selects the tap coefficients for the VSB modulation mode and to produce a QAM modulated signal when said selector selects the tap coefficients for the QAM modulation mode; and a transmitter operable to transmit at least one of the VSB modulated signal and the QAM modulated signal; and said receiving apparatus comprising: a receiver operable to receive a transmitted signal; a selector operable to select between tap coefficients for a VSB demodulation mode and tap coefficients for a QAM demodulation mode; first and second FIR filters operable to filter, when said selector selects the tap coefficients for the VSB demodulation mode, the VSB modulated signal to produce a mapped signal of the VSB modulated signal, and to filter, when said selector selects the tap coefficients for the QAM demodulation mode, the QAM modulated signal to produce a mapped signal of the QAM modulated signal; and a de-mapper operable to de-map at least one of the mapped signal of the VSB modulated signal and the mapped signal of the QAM modulated signal to produce the data stream.id="INS-S-00197" id="INS-S-00198" date="20071127" 14. A signal transmission apparatus comprising: a mapper operable to map a data stream to produce a mapped signal; a selector operable to select between tap coefficients for a VSB modulation mode and tap coefficients for a QAM modulation mode; first and second FIR filters operable to filter the mapped signal to produce a VSB modulated signal when said selector selects the tap coefficients for the VSB modulation mode and to produce a QAM modulated signal when said selector selects the tap coefficients for the QAM modulation mode; and a transmitter operable to transmit at least one of the VSB modulated signal and the QAM modulated signal.id="INS-S-00198" id="INS-S-00199" date="20071127" 15. A signal receiving apparatus comprising: a receiver operable to receive a signal of at least one of a VSB modulated signal and a QAM modulated signal; a selector operable to select between tap coefficients for a VSB demodulation mode and tap coefficients for a QAM demodulation mode; first and second FIR filters operable to filter, when said selector selects the tap coefficients for the VSB demodulation mode, the VSB modulated signal to produce a mapped signal of the VSB modulated signal, and to filter, when said selector selects the tap coefficients for the QAM demodulation mode, the QAM modulated signal to produce a mapped signal of the QAM modulated signal; and a de-mapper operable to de-map the mapped signal of VSB modulated signal to produce a data stream of the VSB modulated signal, and de-map the mapped signal of the QAM modulated signal to produce a data stream of the QAM modulated signal.id="INS-S-00199" id="INS-S-00200" date="20071127" 16. A signal transmission and receiving method comprising a transmission method and a receiving method, said transmission method comprising: mapping a data stream to produce a mapped signal; selecting between tap coefficients for a VSB modulation mode and tap coefficients for a QAM modulation mode; filtering, by first and second FIR filters, the mapped signal to produce a VSB modulated signal when the tap coefficients for the VSB modulation mode are selected, and to produce a QAM modulated signal when the tap coefficients for the QAM modulation mode are selected; and transmitting the modulated signal; and said receiving method comprising: receiving a transmitted signal; selecting between tap coefficients for a VSB demodulation mode and tap coefficients for a QAM demodulation mode; filtering, by first and second FIR filters, when the tap coefficients for the VSB demodulation mode are selected, the VSB modulated signal to produce a mapped signal of the VSB modulated signal, and filtering, when the tap coefficients for the QAM demodulation mode are selected, the QAM modulated signal to produce a mapped signal of the QAM modulated signal; and de-mapping the mapped signal to produce the data stream of the VSB modulated signal or the data stream of the QAM modulated signal.id="INS-S-00200" id="INS-S-00201" date="20071127" 17. A signal transmission method comprising: mapping a data stream to produce a mapped signal; selecting between tap coefficients for a VSB modulation mode and tap coefficients for a QAM modulation mode; filtering, by first and second FIR filters, the mapped signal to produce a VSB modulated signal when the tap coefficients for the VSB modulation mode are selected, and to produce a QAM modulated signal when the tap coefficients for the QAM modulation mode are selected; and transmitting at least one of the VSB modulated signal and the QAM modulated signal.id="INS-S-00201" id="INS-S-00202" date="20071127" 18. A signal receiving method comprising: receiving a signal of at least one of a VSB modulated signal and a QAM modulated signal; selecting between tap coefficients for a VSB demodulation mode and tap coefficients for a QAM demodulation mode; filtering, by first and second FIR filters, when the tap coefficients for the VSB demodulation mode are selected, the VSB modulated signal to produce a mapped signal of the VSB modulated signal, and filtering, when the tap coefficients for the QAM demodulation mode are selected, the QAM modulated signal to produce a mapped signal of the QAM modulated signal; and de-mapping the mapped signal of the VSB modulated signal to produce a data stream of the VSB modulated signal, and de-mapping the mapped signal of the QAM modulated signal to produce a data stream of the QAM modulated signal.id="INS-S-00202"
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