US5621855A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Subband coding of a digital signal in a stereo intensity mode
Assignee: US Philips Corp
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Filing: 1994-10-19
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Granted: 1997-04-15
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Expires: 2014-10-19
Abstract
Abstract Subband coding a digital signal having a first and a second signal component in a stereo intensity mode. The digital signal is subband coded to produce a first subband signal having a first q-sample signal block in response to the first signal component, and a second subband signal having a second q-sample signal block in response to the second signal component, the first and the second subband signals being in the same subband, and the first and second signal blocks being time-equivalent. The first and second signal blocks are processed to obtain a minimum distance value representative of a distance between a line and a plurality of points if (a) the points correspond to the respective pairs of time-equivalent samples in the first and second signal blocks, and are plotted in a coordinate system, and (b) the line is plotted such that it traverses the origin and the points at a minimum distance from the points in the coordinate system. When the minimum distance value is less than or equal to a threshold distance value, a composite signal block composed of q samples obtained by adding the respective pairs of time-equivalent samples in the first and second signal blocks together after multiplying each of the samples of the first signal block by cos(α) and each of the samples of the second signal block by -sin(α), where α is related to the angle formed between the line and a first axis of the coordinate system, are quantized.
Inventors
- 👤 Raymond N. J. Veldhuis
- 👤 Robbert G. van der Waal
- 👤 Leon M. Van De Kerkhof
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:26
CPC Classifications
G; G10; G10L; G10L19/00; G10L19/008; H; H04; H04L; H04L9/00; G06; G06T; G06T9/00; G06T9/007; H04B; H04B1/00; H04B1/66; H04B1/667; G10L19/02; G10L19/0204
Claims Analysis
Total Claims: 63
Claim 1
Independent Claim
392 words
A coding system for coding a digital signal having a first-signal component and a second signal component, the coding system comprising: subband coding means for generating (a) a first subband signal in response to the first signal component, the first subband signal including a first signal block of q samples of that subband signal, where q is a positive integer, and (b) a second subband signal in response to the second signal component, the second subband signal including a second signal block of q samples of that subband signal, the first and the second subband signals being in a same subband and the first and second signal blocks being time-equivalent; control means for: (a) processing the first and second signal blocks to obtain a minimum distance value representative of a distance between a line and a plurality of points if (i) the points correspond to the respective pairs of time-equivalent samples in the first signal block and the second signal block, and are plotted in a coordinate system having a first axis and a second axis intersecting at an origin such that each of the points has a location along the first axis dictated by the sample from the first signal block for that point and at a location along the second axis dictated by the sample from the second signal block for that point, and (ii) the line is plotted such that it traverses the origin and the points at a minimum distance from the points in the coordinate system; and (b) when the minimum distance value is less than or equal to a threshold distance value, (i) generating a control signal and (ii) determining a value β which is representative of an angle formed between the line and the first axis if the points and the line are plotted; quantizing means for quantizing, when the control signal is generated, a composite signal block composed of q samples obtained by adding the respective pairs of time-equivalent samples in the first and second signal blocks together after multiplying each of the samples of the first signal block by cos(α) and each of the samples of the second signal block by -sin(α), where α is determined based on β, each of the q samples in the composite signal block after quantization being represented by n c bits, where n c is a variable.
Claim 2
Dependent Claim
392 words
A coding system for coding a digital signal having a first-signal component and a second signal component, the coding system comprising: subband coding means for generating (a) a first subband signal in response to the first signal component, the first subband signal including a first signal block of q samples of that subband signal, where q is a positive integer, and (b) a second subband signal in response to the second signal component, the second subband signal including a second signal block of q samples of that subband signal, the first and the second subband signals being in a same subband and the first and second signal blocks being time-equivalent; control means for: (a) processing the first and second signal blocks to obtain a minimum distance value representative of a distance between a line and a plurality of points if (i) the points correspond to the respective pairs of time-equivalent samples in the first signal block and the second signal block, and are plotted in a coordinate system having a first axis and a second axis intersecting at an origin such that each of the points has a location along the first axis dictated by the sample from the first signal block for that point and at a location along the second axis dictated by the sample from the second signal block for that point, and (ii) the line is plotted such that it traverses the origin and the points at a minimum distance from the points in the coordinate system; and (b) when the minimum distance value is less than or equal to a threshold distance value, (i) generating a control signal and (ii) determining a value β which is representative of an angle formed between the line and the first axis if the points and the line are plotted; quantizing means for quantizing, when the control signal is generated, a composite signal block composed of q samples obtained by adding the respective pairs of time-equivalent samples in the first and second signal blocks together after multiplying each of the samples of the first signal block by cos(α) and each of the samples of the second signal block by -sin(α), where α is determined based on β, each of the q samples in the composite signal block after quantization being represented by n c bits, where n c is a variable.
Claim 3
Dependent Claim
10 words
The coding system as claimed in claim 1, wherein α=-β.
Claim 4
Dependent Claim
34 words
The coding system as claimed in claim 1, wherein (a) if β satisfies a condition 0°≦β≦90°, α=-β; (b) if β satisfies a condition 90°<β<135°, α=-90°; and (c) if β satisfies a condition -45°<β<0°, α=0°.
Claim 5
Dependent Claim
12 words
The coding system as claimed in claim 3, wherein if β=135°, α=-90°.
Claim 6
Dependent Claim
12 words
The coding system as claimed in claim 3, wherein if β=-45°, α=0°.
Claim 7
Dependent Claim
77 words
The coding system as claimed in claim 1, wherein said quantizing means is further adapted for quantizing, when the control signal is not generated, the first signal block and the second signal block separately, the q samples in the first signal block after quantization each being represented by n 1 bits and the q samples in the second signal block after quantization each being represented by n 2 bits, where n 1 and n 2 are variables.
Claim 8
Dependent Claim
32 words
The coding system as claimed in claim 1, wherein said minimum distance value is representative of the sum of the squares of the distances between each of the points and the line.
Claim 9
Dependent Claim
102 words
The coding system as claimed in claim 1, wherein the coding system further comprises combining means for producing the composite signal block, said combining means comprising: first multiplying means for multiplying each of the samples of the first signal block by cos(α); second multiplying means for multiplying each of the samples of the second signal block by -sin(α); and summing means for adding the respective pairs of time-equivalent samples in the first and second signal blocks together after multiplying each of the samples of the first signal block by cos(α) and each of the samples of the second signal block by -sin(α).
Claim 10
Dependent Claim
41 words
The coding system as claimed in claim 1, further comprising scale factor determining means for determining a composite scale factor for the composite signal block, the composite scale factor being determined from a sample therein having a maximum absolute value amplitude.
Claim 11
Dependent Claim
60 words
The coding system as claimed in claim 9, wherein said scale factor determining means comprises: first multiplying means for multiplying the composite scale factor by cos(α) to obtain a first scale factor for the first signal block; and second multiplying means for multiplying the composite scale factor by -sin(α) to obtain a second scale factor for the second signal block.
Claim 12
Dependent Claim
77 words
The coding system as claimed in claim 9, wherein said scale factor determining means is adapted to determine a scale factor for the first signal block in accordance with the following relationship: ##EQU12## where SF lr is the composite scale factor, S 1 is the sum of the squares of the amplitudes of the samples in the first signal block and S c is the sum of the squares of the amplitudes in the composite signal block.
Claim 13
Dependent Claim
77 words
The coding system as claimed in claim 9, wherein said scale factor determining means is adapted to determine a scale factor for the second signal block in accordance with the following relationship: ##EQU13## where SF lr is the composite scale factor, S 2 is the sum of the squares of the amplitudes of the samples in the second signal block and S c is the sum of the squares of the amplitudes in the composite signal block.
Claim 14
Dependent Claim
39 words
A transmitter, comprising the coding system as claimed in claim 9, for transmitting the composite signal block, after quantization, scale factor information related to the composite scale factor, and information related to α when the control signal is generated.
Claim 15
Dependent Claim
38 words
The transmitter as claimed in claim 13, wherein said quantizing means comprises a dividing means for dividing each of the samples of the composite signal block by the composite scale factor prior to quantizing the composite signal block.
Claim 16
Dependent Claim
132 words
A transmitting and receiving system, comprising: the transmitter claimed in claim 14; and a receiver for receiving the composite signal, the scale factor information and the information related to which have been transmitted, the receiver comprising multiplying means for: multiplying the composite scale factor by cos α so as to obtain a scale factor for the first signal block; multiplying the composite scale factor by -sin α so as to obtain a scale factor for the second signal block; multiplying the samples of the composite signal block, after dequantization, by the first scale factor so as to obtain a replica of the first signal block; and multiplying the samples of the composites signal block, after dequantization, by the second scale factor so as to obtain a replica of the second signal block.
Claim 17
Dependent Claim
109 words
A transmitting and receiving system, comprising: the transmitter claimed in claim 14; and a receiver for receiving the composite signal block, the scale factor information and the information related to α which have been transmitted, the receiver comprising multiplying means for: multiplying the composite scale factor by each of the samples in the composite signal block, after dequantization, to obtain composite scale factor samples; multiplying each of the composite scale factor samples by cos α so as to obtain a replica of the first signal block; and multiplying each of the composite scale factor samples by -sin α so as to obtain a replica of the second signal block.
Claim 18
Dependent Claim
43 words
The transmitter as claimed in claim 14, wherein the transmitter is adapted to record the composite signal block, after quantization, the scale factor information and the information related to α in a track on a record carrier when the control signal is generated.
Claim 19
Dependent Claim
133 words
A transmitting and receiving system, comprising: the transmitter claimed in claim 17; and a receiver for receiving the composite signal block, the scale factor information and the information related to α from the track, the receiver comprising multiplying means for: multiplying the composite scale factor by cos α so as to obtain a scale factor for the first signal block; multiplying the composite scale factor by -sin α so as to obtain a scale factor for the second signal block; multiplying the samples of the composite signal block, after dequantization, by the first scale factor so as to obtain a replica of the first signal block; and multiplying the samples of the composites signal block, after dequantization, by the second scale factor so as to obtain a replica of the second signal block.
Claim 20
Dependent Claim
107 words
A transmitting and receiving system, comprising: the transmitter claimed in claim 17; and a receiver for receiving the composite signal block, scale factor information and the information related to α from the track, the receiver comprising multiplying means for: multiplying the composite scale factor by each of the samples in the composite signal block, after dequantization, to obtain composite scale factor samples; multiplying each of the composite scale factor samples by cos α so as to obtain a replica of the first signal block; and multiplying each of the composite scale factor samples by -sin α so as to obtain a replica of the second signal block.
Claim 21
Dependent Claim
35 words
The coding system as claimed in claim 1, further comprising scale factor determining means for determining a first scale factor for the first signal block and a second scale factor for the second signal block.
Claim 22
Dependent Claim
81 words
The coding system as claimed in claim 20, wherein said scale factor determining means comprises: second quantizing means for quantizing the first scale factor; dequantizing means for dequantizing the first scale factor to obtain a dequantized first scale factor; and dividing means for dividing the dequantized first scale factor by the first scale factor to obtain a coefficient based thereon; and said quantizing means comprises multiplying means for multiplying each of the samples of the composite signal block by the coefficient.
Claim 23
Dependent Claim
37 words
The coding system as claimed in claim 21, wherein the coefficient is equal to SF 1 /SF' 1 , where SF 1 is the first scale factor and SF' 1 is the first scale factor after quantization.
Claim 24
Dependent Claim
68 words
The coding system as claimed in claim 21, wherein said scale factor determining means is further adapted to determine a composite scale factor for the composite signal block, the composite scale factor being determined from a sample therein having a maximum absolute value amplitude; and said quantizing means further comprising dividing means for dividing each of the samples of the composite signal block by the composite scale factor.
Claim 25
Dependent Claim
81 words
The coding system as claimed in claim 20, wherein said scale factor determining means comprises: second quantizing means for quantizing the second scale factor; dequantizing means for dequantizing the second scale factor to obtain a dequantized second scale factor; and dividing means for dividing the dequantized second scale factor by the second scale factor to obtain a coefficient based thereon; and said quantizing means comprises multiplying means for multiplying each of the samples of the composite signal block by the coefficient.
Claim 26
Dependent Claim
37 words
The coding system as claimed in claim 24, wherein the coefficient is equal to SF 2 /SF' 2 , where SF 2 is the second scale factor and SF' 2 is the second scale factor after quantization.
Claim 27
Dependent Claim
68 words
The coding system as claimed in claim 24, wherein said scale factor determining means is further adapted to determine a composite scale factor for the composite signal block, the composite scale factor being determined from a sample therein having a maximum absolute value amplitude; and said quantizing means further comprising dividing means for dividing each of the samples of the composite signal block by the composite scale factor.
Claim 28
Dependent Claim
125 words
The coding system as claimed in claim 20, wherein said scale factor determining means comprises second quantizing means for quantizing (a) the first scale factor and (b) the second scale factor; dequantizing means for dequantizing (a) the first scale factor to obtain a dequantized first scale factor and (b) the second scale factor to obtain a dequantized second scale factor; and dividing means for dividing (a) the dequantized first scale factor by the first scale factor to obtain a first coefficient based thereon and (b) the dequantized second scale factor by the second scale factor to obtain a second coefficient thereon; and said quantizing means comprises multiplying means for multiplying each of the samples of the composite signal block by the first and second coefficients.
Claim 29
Dependent Claim
49 words
The coding system as claimed in claim 27, wherein the coefficient is equal to ##EQU14## where SF 1 is the first scale factor, SF' 1 is the first scale factor after quantization, SF 2 is the second scale factor and SF' 2 is the second scale factor after quantization.
Claim 30
Dependent Claim
68 words
The coding system as claimed in claim 27, wherein said scale factor determining means is further adapted to determine a composite scale factor for the composite signal block, the composite scale factor being determined from a sample therein having a maximum absolute value amplitude; and said quantizing means further comprising dividing means for dividing each of the samples of the composite signal block by the composite scale factor.
Claim 31
Dependent Claim
51 words
A transmitter, comprising the coding system as claimed in claim 20, for transmitting the composite signal block, after quantization, scale factor information related to the first and second scale factors, and at least one sign bit for either the first or the second scale factor when the control signal is generated.
Claim 32
Dependent Claim
38 words
The transmitter as claimed in claim 30, wherein said quantizing means comprises a dividing means for dividing each of the samples of the composite signal block by the composite scale factor prior to quantizing the composite signal block.
Claim 33
Dependent Claim
95 words
A transmitting and receiving system, comprising: the transmitter claimed in claim 31; and a receiver for receiving the composite signal block, the scale factor information and the at least one sign bit which have been transmitted, the receiver comprising multiplying means for: multiplying each of the samples of the composite signal block by the first scale factor so as to obtain a replica of the first signal block; and multiplying each of the samples of the composite signal block by the second scale factor so as to obtain a replica of the second signal block.
Claim 34
Dependent Claim
44 words
The transmitter as claimed in claim 31, wherein the transmitter is adapted to record the composite signal block, after quantization, the scale factor information and the at least one sign bit in a track on a record carrier when the control signal is generated.
Claim 35
Dependent Claim
94 words
A transmitting and receiving system, comprising: the transmitter claimed in claim 33; and a receiver for receiving the composite signal block, the scale factor information and the at least one sign bit from the track, the receiver comprising multiplying means for: multiplying each of the samples of the composite signal block by the first scale factor so as to obtain a replica of the first signal block; and multiplying each of the samples of the composite signal block by the second scale factor so as to obtain a replica of the second signal block.
Claim 36
Dependent Claim
11 words
A transmitter comprising the coding system as claimed in claim 8.
Claim 37
Dependent Claim
33 words
The transmitter as claimed in claim 35, wherein the transmitter is adapted to record the composite signal block, after quantization, in a track on a record carrier when the control signal is generated.
Claim 38
Dependent Claim
16 words
The transmitter as claimed in claim 35, wherein the record carrier is a magnetic record carrier.
Claim 39
Independent Claim
387 words
A method for coding a digital signal having a first signal component and a second signal component, the method comprising: generating (a) a first subband signal in response to the first signal component, the first subband signal including a first signal block of q samples of that subband signal, where q is a positive integer, and (b) a second subband signal in response to the second signal component, the second subband signal including a second signal block of q samples of that subband signal, the first and the second subband signals being in a same subband and the first and second signal blocks being time-equivalent; processing the first and second signal blocks to obtain a minimum distance value representative of a distance between a line and a plurality of points if (i) the points correspond to the respective pairs of time-equivalent samples in the first signal block and the second signal block, and are plotted in a coordinate system having a first axis and a second axis intersecting at an origin such that each of the points has a location along the first axis dictated by the sample from the first signal block for that point and at a location along the second axis dictated by the sample from the second signal block for that point, and (ii) the line is plotted such that it traverses the origin and the points at a minimum distance from the points in the coordinate system; when the minimum distance value is less than or equal to a threshold distance value, (a) generating a control signal and (b) determining a value β which is representative of an angle formed between the line and the first axis if the points and the line are plotted; and when the control signal is generated, (a) generating a composite signal block composed of q samples obtained by adding the respective pairs of time-equivalent samples in the first and second signal blocks together after multiplying each of the samples of the first signal block by cos(α) and each of the samples of the second signal block by -sin(α), where α is determined based on β; and (b) quantizing the composite signal block, each of the q samples in the composite signal block after quantization being represented by n c bits, where n c is a variable.
Claim 40
Independent Claim
387 words
A method for coding a digital signal having a first signal component and a second signal component, the method comprising: generating (a) a first subband signal in response to the first signal component, the first subband signal including a first signal block of q samples of that subband signal, where q is a positive integer, and (b) a second subband signal in response to the second signal component, the second subband signal including a second signal block of q samples of that subband signal, the first and the second subband signals being in a same subband and the first and second signal blocks being time-equivalent; processing the first and second signal blocks to obtain a minimum distance value representative of a distance between a line and a plurality of points if (i) the points correspond to the respective pairs of time-equivalent samples in the first signal block and the second signal block, and are plotted in a coordinate system having a first axis and a second axis intersecting at an origin such that each of the points has a location along the first axis dictated by the sample from the first signal block for that point and at a location along the second axis dictated by the sample from the second signal block for that point, and (ii) the line is plotted such that it traverses the origin and the points at a minimum distance from the points in the coordinate system; when the minimum distance value is less than or equal to a threshold distance value, (a) generating a control signal and (b) determining a value β which is representative of an angle formed between the line and the first axis if the points and the line are plotted; and when the control signal is generated, (a) generating a composite signal block composed of q samples obtained by adding the respective pairs of time-equivalent samples in the first and second signal blocks together after multiplying each of the samples of the first signal block by cos(α) and each of the samples of the second signal block by -sin(α), where α is determined based on β; and (b) quantizing the composite signal block, each of the q samples in the composite signal block after quantization being represented by n c bits, where n c is a variable.
Claim 41
Dependent Claim
9 words
The method as claimed in claim 38, wherein α=-β.
Claim 42
Dependent Claim
33 words
The method as claimed in claim 38, wherein (a) if β satisfies a condition 0°≦β≦90°, α=-β; (b) if β satisfies a condition 90°<β<135°, α=-90°; and (c) if β satisfies a condition -45°<β<0°, α=0°.
Claim 43
Dependent Claim
41 words
The method as claimed in claim 38, further comprising determining a composite scale factor for the composite signal block when the control signal is generated, the composite scale factor being determined from a sample therein having a maximum absolute value amplitude.
Claim 44
Dependent Claim
28 words
The method as claimed in claim 41, further comprising determining a scale factor for the first and second signal blocks on the basis of the composite scale factor.
Claim 45
Dependent Claim
29 words
The method as claimed in claim 38, further comprising determining a first scale factor for the first signal block and a second scale factor for the second signal block.
Claim 46
Dependent Claim
67 words
The method as claimed in claim 43, further comprising: quantizing the first or and second scale factor to obtain a quantized scale factor; dequantizing the quantized scale factor to obtain a dequantized scale factor; dividing the dequantized first scale factor by the scale factor which was quantized to obtain a coefficient based thereon; and multiplying each of the samples of the composite signal block by the coefficient.
Claim 47
Dependent Claim
189 words
A coding system for coding a digital signal having a first signal component and a second signal component, the coding system comprising: subband coding means for generating (a) a first subband signal in response to the first signal component, the first subband signal including a first signal block of q samples of that subband signal, where q is a positive integer, and (b) a second subband signal in response to the second signal component, the second subband signal including a second signal block of q samples of that subband signal, the first and the second subband signals being in a same subband and the first and second signal blocks being time-equivalent; quantizing means for quantizing a composite signal block composed of q samples obtained by combining the first and second signal blocks together, each of the q samples in the composite signal block after quantization being represented by n c bits, where n c is a variable; and scale factor determining means for determining a composite scale factor for the composite signal block, the composite scale factor being determined from a sample therein having a maximum absolute value amplitude.
Claim 48
Dependent Claim
189 words
A coding system for coding a digital signal having a first signal component and a second signal component, the coding system comprising: subband coding means for generating (a) a first subband signal in response to the first signal component, the first subband signal including a first signal block of q samples of that subband signal, where q is a positive integer, and (b) a second subband signal in response to the second signal component, the second subband signal including a second signal block of q samples of that subband signal, the first and the second subband signals being in a same subband and the first and second signal blocks being time-equivalent; quantizing means for quantizing a composite signal block composed of q samples obtained by combining the first and second signal blocks together, each of the q samples in the composite signal block after quantization being represented by n c bits, where n c is a variable; and scale factor determining means for determining a composite scale factor for the composite signal block, the composite scale factor being determined from a sample therein having a maximum absolute value amplitude.
Claim 49
Dependent Claim
88 words
The coding system as claimed in claim 45, wherein said scale factor determining means is further adapted to determine a scale factor for the first signal block or the second signal block in accordance with the following relationship: ##EQU15## where SF lr is the composite scale factor, S 12 is the sum of the squares of the amplitudes of the samples in the first signal block or the second signal block, and S c is the sum of the squares of the amplitudes in the composite signal block.
Claim 50
Dependent Claim
99 words
The coding system as claimed in claim 45, wherein said scale factor determining means is further adapted for determining a scale factor for the first signal block or the second signal block; said scale factor determining means comprises: second quantizing means for quantizing the scale factor; dequantizing means for dequantizing the scale factor to obtain a dequantized scale factor; and dividing means for dividing the dequantized scale factor by the scale factor to obtain a coefficient based thereon; and said quantizing means comprises multiplying means for multiplying each of the samples of the composite signal block by the coefficient.
Claim 51
Dependent Claim
176 words
A coding method for coding a digital signal having a first signal component and a second signal component, the method comprising: generating (a) a first subband signal in response to the first signal component, the first subband signal including a first signal block of q samples of that subband signal, where q is a positive integer, and (b) a second subband signal in response to the second signal component, the second subband signal including a second signal block of q samples of that subband signal, the first and the second subband signals being in a same subband and the first and second signal blocks being time-equivalent; quantizing a composite signal block composed of q samples obtained by combining the first and second signal blocks together, each of the q samples in the composite signal block after quantization being represented by n c bits, where n c is a variable; and determining a composite scale factor for the composite signal block, the composite scale factor being determined from a sample therein having a maximum absolute value amplitude.
Claim 52
Dependent Claim
176 words
A coding method for coding a digital signal having a first signal component and a second signal component, the method comprising: generating (a) a first subband signal in response to the first signal component, the first subband signal including a first signal block of q samples of that subband signal, where q is a positive integer, and (b) a second subband signal in response to the second signal component, the second subband signal including a second signal block of q samples of that subband signal, the first and the second subband signals being in a same subband and the first and second signal blocks being time-equivalent; quantizing a composite signal block composed of q samples obtained by combining the first and second signal blocks together, each of the q samples in the composite signal block after quantization being represented by n c bits, where n c is a variable; and determining a composite scale factor for the composite signal block, the composite scale factor being determined from a sample therein having a maximum absolute value amplitude.
Claim 53
Dependent Claim
240 words
A receiving system, comprising: receiving means for receiving (a) samples of a composite signal block, where each of the samples is representative of a combination of a pair of respective time-equivalent samples from a first signal block of a first subband signal and a second signal block of a second subband signal, the first and the second subband signals being in a same subband and the first and second signal blocks being time-equivalent; (b) a composite scale factor for the composite signal block; and (c) angle information pertaining to an angle α which is representative of an angle between a line and a first axis if (i) points corresponding to the respective pairs of time-equivalent samples in the first signal block and the second signal block are plotted in a coordinate system having the first axis and a second axis intersecting at an origin such that each of the points has a location along the first axis dictated by the sample from the first signal block for that point and at a location along the second axis dictated by the sample from the second signal block for that point, and (ii) the line is plotted such that it traverses the origin and the points at a minimum distance from the points in the coordinate system; and deriving means for deriving the first and second signal blocks from the samples of the composite signal block, the composite scale factor and α.
Claim 54
Dependent Claim
240 words
A receiving system, comprising: receiving means for receiving (a) samples of a composite signal block, where each of the samples is representative of a combination of a pair of respective time-equivalent samples from a first signal block of a first subband signal and a second signal block of a second subband signal, the first and the second subband signals being in a same subband and the first and second signal blocks being time-equivalent; (b) a composite scale factor for the composite signal block; and (c) angle information pertaining to an angle α which is representative of an angle between a line and a first axis if (i) points corresponding to the respective pairs of time-equivalent samples in the first signal block and the second signal block are plotted in a coordinate system having the first axis and a second axis intersecting at an origin such that each of the points has a location along the first axis dictated by the sample from the first signal block for that point and at a location along the second axis dictated by the sample from the second signal block for that point, and (ii) the line is plotted such that it traverses the origin and the points at a minimum distance from the points in the coordinate system; and deriving means for deriving the first and second signal blocks from the samples of the composite signal block, the composite scale factor and α.
Claim 55
Dependent Claim
117 words
The system as claimed in claim 49, wherein said deriving means comprises: first multiplying means for multiplying the composite scale factor by cos α so as to obtain a scale factor for the first signal block; second multiplying means for multiplying the composite scale factor by -sin α so as to obtain a scale factor for the second signal block; third multiplying means for multiplying the samples of the composite signal block by the first scale factor so as to obtain a replica of the first signal block; and fourth multiplying means for multiplying the samples of the composites signal block by the second scale factor so as to obtain a replica of the second signal block.
Claim 56
Dependent Claim
92 words
The system as claimed in claim 49, wherein said deriving means comprises: first multiplying means for multiplying the composite scale factor by each of the samples in the composite signal block, after dequantization, to obtain composite scale factor samples; second multiplying means for multiplying each of the composite scale factor samples by cos α so as to obtain a replica of the first signal block; and third multiplying means for multiplying each of the composite scale factor samples by -sin α so as to obtain a replica of the second signal block.
Claim 57
Dependent Claim
35 words
The system as claimed in claim 49, wherein said receiving means is adapted to receive the samples of the composite signal block, the composite scale factor and α from a track of a record carrier.
Claim 58
Dependent Claim
234 words
A coding system for coding a digital signal having a first signal component and a second signal component, the coding system comprising: subband coding means for generating (a) a first subband signal in response to the first signal component, the first subband signal including a first signal block of q samples of that subband signal, where q is a positive integer, and (b) a second subband signal in response to the second signal component, the second subband signal including a second signal block of q samples of that subband signal, the first and the second subband signals being in a same subband and the first and second signal blocks being time-equivalent; composite signal block producing means for producing a composite signal block composed of q samples from the first and second signal blocks, said composite signal block producing means including: angle determining means for determining a value α on the basis of the first and second signal blocks; combining means for adding the respective pairs of time-equivalent samples in the first and second signal blocks together after multiplying each of the samples of the first signal block by cos(α) and each of the samples of the second signal block by -sin(α); and quantizing means for quantizing the composite signal block, each of the q samples in the composite signal block after quantization being represented by n c bits, where n c is a variable.
Claim 59
Dependent Claim
234 words
A coding system for coding a digital signal having a first signal component and a second signal component, the coding system comprising: subband coding means for generating (a) a first subband signal in response to the first signal component, the first subband signal including a first signal block of q samples of that subband signal, where q is a positive integer, and (b) a second subband signal in response to the second signal component, the second subband signal including a second signal block of q samples of that subband signal, the first and the second subband signals being in a same subband and the first and second signal blocks being time-equivalent; composite signal block producing means for producing a composite signal block composed of q samples from the first and second signal blocks, said composite signal block producing means including: angle determining means for determining a value α on the basis of the first and second signal blocks; combining means for adding the respective pairs of time-equivalent samples in the first and second signal blocks together after multiplying each of the samples of the first signal block by cos(α) and each of the samples of the second signal block by -sin(α); and quantizing means for quantizing the composite signal block, each of the q samples in the composite signal block after quantization being represented by n c bits, where n c is a variable.
Claim 60
Dependent Claim
168 words
The coding system as claimed in claim 53, wherein said angle determining means comprises a first angle determiner for determining a value β and a second angle determiner for determining the value of α on the basis of β, wherein β corresponds to an angle which would exist, in a coordinate system having a first axis and a second axis intersecting at an origin, between the first axis and a line which traverses the origin, if (a) the coordinate system has points correspond to the respective pairs of time-equivalent samples in the first signal block and the second signal block plotted in the coordinate system such that each of the points has a location along the first axis dictated by the sample from the first signal block for that point and at a location along the second axis dictated by the sample from the second signal block for that point, and (b) the line is plotted such that it is located at a minimum distance from the points.
Claim 61
Independent Claim
207 words
A method for coding a digital signal having a first signal component and a second signal component, the coding system comprising: generating (a) a first subband signal in response to the first signal component, the first subband signal including a first signal block of q samples of that subband signal, where q is a positive integer, and (b) a second subband signal in response to the second signal component, the second subband signal including a second signal block of q samples of that subband signal, the first and the second subband signals being in a same subband and the first and second signal blocks being time-equivalent; determining a value α on the basis of the first and second signal blocks; producing a composite signal block composed of q samples from the first and second signal blocks by adding the respective pairs of time-equivalent samples in the first and second signal blocks together after multiplying each of the samples of the first signal block by cos(α) and each of the samples of the second signal block by -sin(α); and quantizing the composite signal block, each of the q samples in the composite signal block after quantization being represented by n c bits, where n c is a variable.
Claim 62
Independent Claim
207 words
A method for coding a digital signal having a first signal component and a second signal component, the coding system comprising: generating (a) a first subband signal in response to the first signal component, the first subband signal including a first signal block of q samples of that subband signal, where q is a positive integer, and (b) a second subband signal in response to the second signal component, the second subband signal including a second signal block of q samples of that subband signal, the first and the second subband signals being in a same subband and the first and second signal blocks being time-equivalent; determining a value α on the basis of the first and second signal blocks; producing a composite signal block composed of q samples from the first and second signal blocks by adding the respective pairs of time-equivalent samples in the first and second signal blocks together after multiplying each of the samples of the first signal block by cos(α) and each of the samples of the second signal block by -sin(α); and quantizing the composite signal block, each of the q samples in the composite signal block after quantization being represented by n c bits, where n c is a variable.
Claim 63
Dependent Claim
152 words
The method as claimed in claim 55, further comprising determining a value β, where β corresponds to an angle which would exist, in a coordinate system having a first axis and a second axis intersecting at an origin, between the first axis and a line which traverses the origin, if (a) the coordinate system has points correspond to the respective pairs of time-equivalent samples in the first signal block and the second signal block plotted in the coordinate system such that each of the points has a location along the first axis dictated by the sample from the first signal block for that point and at a location along the second axis dictated by the sample from the second signal block for that point, and (b) the line is plotted such that it is located at a minimum distance from the points; and wherein α is determined on the basis of β.
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USPTO Annuity & Maintenance Windows
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