Abstract:
PROBLEM TO BE SOLVED: To accurately specify a band having a large error among all the bands by using a small calculation amount. SOLUTION: A first position identification unit 201 uses a first layer error conversion coefficient including an error of a decoding signal for an input signal to search for a band having a large error in a relatively wide bandwidth in all the bands of the input signal and generates first position information indicating the identified band. A second position identification unit 202 searches for a target frequency band having a large error in a relatively narrow bandwidth in the band identified by the first position identification unit 201 and generates second position information indicating the identified target frequency band. The encoding unit 203 encodes a first layer decoding error conversion coefficient contained in the target frequency band and generates encoding information. The first position information, the second position information and the encoding information are transmitted to a communication partner. COPYRIGHT: (C)2011,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To accurately specify a band having a large error among all the bands by using a small calculation amount. SOLUTION: A first position identification unit 201 uses a first layer error conversion coefficient including an error of a decoding signal for an input signal to search for a band having a large error in a relatively wide bandwidth in all the bands of the input signal and generates first position information indicating the identified band. A second position identification unit 202 searches for a target frequency band having a large error in a relatively narrow bandwidth in the band identified by the first position identification unit 201, and generates second position information indicating the identified target frequency band. The encoding unit 203 encodes a first layer decoding error conversion coefficient contained in the target frequency band, and generates encoding information. The first position information, the second position information, and the encoding information are transmitted to a communication partner. COPYRIGHT: (C)2011,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To simultaneously transmit various additional information such as audio information, character information, and image information while suppressing the communication cost and the line use ratio without increasing the calculation cost in the decoding. SOLUTION: An encoded information analysis unit 602 outputs transmission mode information and an additional information flag to an additional processing unit 603 and outputs an information source code of each layer to the additional processing unit 603 according to the transmission mode information. According to the combination of the transmission mode information and the additional mode information, the additional processing unit 603 performs additional processing of the additional information for the information source code of each layer. An encoded information integration unit 604 integrates the transmission mode information, the additional mode information, the additional information flag and various information source codes input from the additional processing unit 603. COPYRIGHT: (C)2010,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To accurately specify a band having large errors from the whole band with small computational complexity. SOLUTION: A first position specifying part 201 searches the band having the large errors in relatively wide band width and generates first position information indicating a specified band over the whole band of an input signal by using a first layer error conversion coefficient indicating the errors of a decoding signal to the input signal. A second position specifying part 202 searches a target frequency band having the large errors in relatively narrow band width in the band specified in the first position specifying part 201, and generates second position information indicating a specified target frequency band. An encoding part 203 generates encoding information by encoding a first layer decoding error conversion coefficient included in the target frequency band. The first position information, the second position information and the encoding information are transmitted to a communication partner. COPYRIGHT: (C)2009,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To accurately specify a band having large errors from the whole band with small computational complexity. SOLUTION: A first position specifying part 201 searches the band having the large errors in relatively wide band width and generates first position information indicating a specified band over the whole band of an input signal by using a first layer error conversion coefficient indicating the errors of a decoding signal to the input signal. A second position specifying part 202 searches a target frequency band having the large errors in relatively narrow band width in the band specified in the first position specifying part 201, and generates second position information indicating a specified target frequency band. An encoding part 203 generates encoding information by encoding a first layer decoding error conversion coefficient included in the target frequency band. The first position information, the second position information and the encoding information are transmitted to a communication partner. COPYRIGHT: (C)2009,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a communication device capable of performing highly efficient two-way communication sufficiently using human property in the two-way communication.SOLUTION: A communication device 100 comprises: a decoder 170 for decoding a code received from a transmission path 102; an acoustic pressure measuring section 180 for measuring acoustic pressure of the decoded signal to determine the condition of a communication partner on the basis of the measured acoustic pressure; a table 121 for storing a correspondence between the condition of the communication partner and a coder; and a mode selector 120 for referring to the table 121 on the basis of the presence or absence of tonality from a tonal detector 110 and the determination result as to whether or not a telephone conversation is performed from the acoustic measuring section 180 and selecting a coder corresponding to the condition of the communication partner from a coder 130 for high delay and a coder 140 for low delay.
Abstract:
PROBLEM TO BE SOLVED: To provide a voice encoding device for accurately encoding the spectral shape of a signal having a strong tonality, such as a vowel. SOLUTION: A sub-band constituting unit 151 divides a first layer error conversion coefficient to be encoded into M-pieces of sub-bands to generate M-pieces of sub-band conversion coefficients. A shape vector encoding unit 152 performs encoding on each of the M-pieces of sub-band conversion coefficients to obtain M-pieces of shape encoded information and calculates a target gain of each of the M-pieces of sub-band conversion coefficients. A gain vector forming unit 153 forms one gain vector by using M-pieces of target gains. A gain vector encoding unit 154 encodes the gain vector to obtain gain encoded information, and a multiplexing unit 155 multiplexes the shape encoded information with the gain encoded information. COPYRIGHT: (C)2011,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a voice encoding device capable of accurately encoding the shape of a spectrum of a signal in which tonality is strong like a vowel. SOLUTION: A subband composition part 151 divides a first layer error conversion coefficient to be encoded into M subbands to generate M subband conversion coefficients. A shape vector encoding part 152 encodes each of the M subband conversion coefficients to obtain M pieces of shape encoding information, and calculates each target gain of the M subband conversion coefficients. A gain vector composition part 153 composes one gain vector by using M target gains. A gain vector encoding part 154 obtains gain encoding information by encoding the gain vector. A multiplexing part 155 multiplexes shape encoding information with gain encoding information. COPYRIGHT: (C)2009,JPO&INPIT