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US 5,168,116 AGranted
Method and device for compressing signals of plural channels
AssigneeYamaha Corporation
InventorAkira Iizuka
Life of this patent
Estimating the term…
Abstract
When analog signals of two or more channels are converted to digital signals, a differential signal of at least two of these channels (A and B) is taken out. The signal of either channel A or B or the sum signal of these signals and the above-mentioned differential signal are quantized by binary-coding with n and m bits (n>m), respectively. The quantization is also performed by sampling with the sampling frequency f1 and f2 (f1>f2). As a result the memory capacity is saved and the transmission speed is improved.
Claims28
A method for storing and reproducing musical tone signals for plural channels in compressed fashion, comprising the steps of:
- providing the musical tone signals of plural channels;
- determining with a first subtracting means a differential signal between musical tone signals of at least two of the plural channels, namely channel A and channel B;
- quantizing by binary-coding a musical tone signal of either said channel A or B and said differential signal with n bits and m bits (n>m), respectively;
- storing individually the quantizied musical tone and differential signals into a memory storage device,
- reading the stored musical tone and differential signals from the memory storage device,
- reproducing musical tone signals corresponding to the musical tone signals of the plural channels based on the signals read from the memory storage device, and
- providing the reproduced musical tone signals to a tone generator for generating musical tones in response to the musical tone signals.
4 more elements
A method for storing and reproducing musical tone signals for plural channels in compressed fashion, comprising the steps of:
- providing the musical tone signals of plural channels;
- determining with a first subtracting means a differential signal between musical tone signals of at least two of the plural channels, namely channel A and channel B;
- quantizing by binary-coding the sum signal of the musical tone signals of said channels A and B and said differential signal with n bits and m bits (n>m), respectively;
- storing individually the quantized musical tone and differential signals into a memory storage device,
- reading the stored musical tone and differential signals from the memory storage device,
- reproducing musical tone signals corresponding to the musical tone signals of the plural channels based on the signals read from the memory storage device, and
- providing the reproduced musical tone signals to a tone generator for generating musical tones in response to the musical tone signals.
4 more elements
A compressed musical tone signal storing and reproducing device for plural channels, comprising:
- means for quantizing by binary-coding either of the musical tone signals of at least two of the plural channels, namely channel A and channel B, with n bits;
- means for quantizing by binary-coding a differential signal between the musical tone signals of said two channels A and B with m bits (n>m);
- a memory storage device for storing individually the quantized musical tone and differential signals,
- means for reading the stored musical tone and differential signals from the memory storage device,
- means for reproducing musical tone signals corresponding to the musical tone signals of the plural channels based on the signals read from the memory storage device, and
- tone generating means for generating musical tones in response to the musical tone signals.
3 more elements
A compressed musical tone signal storing and reproducing device, comprising:
- means for quantizing by binary-coding a sum signal of musical tone signals of at least two of several channels, namely channel A and channel B, with n bits;
- means for quantizing by binary-coding a differential signal between musical tone signals of said two channels A and B with m bits (n>m);
- a memory storage device for storing individually the quantized musical tone and differential signals,
- means for reading the stored musical tone and differential signals from the memory storage device,
- means for reproducing musical tone signals corresponding to the musical tone signals of the plural channels based on the signals read from the memory storage device, and
- tone generating means for generating musical tones in response to the musical tone signals.
3 more elements
A method for storing and reproducing musical tone signals for plural channels in compressed fashion, comprising the steps of:
- providing musical tone signals of plural channels;
- determining with a first subtracting means a differential signal between musical tone signals of at least two of the plural channels, namely channel A and channel B;
- sampling the musical tone signal of either said channel A or B and said differential signal with a sampling frequency f1 and f2 (f1>f2), respectively,;
- storing individually the sampled musical tone and differential signals into a memory storage device,
- reading the stored musical tone and differential signals from the memory storage device,
- reproducing musical tone signals corresponding to the musical tone signals of the plural channels based on the signals read from the memory storage device, and
- providing the reproduced musical tone signals to a tone generator for generating musical tones in response to the musical tone signals.
4 more elements
A method for storing and reproducing musical tone signals for plural channels in compressed fashion, comprising the steps of:
- providing musical tone signals of plural channels;
- determining with a first subtracting means a differential signal between musical tone signals of at least two of the plural channels, namely channel A and channel B;
- sampling a sum signal of musical tone signals of said channels A and B and said differential signal with a sampling frequency f1 and f2 (f1>f2), respectively;
- storing individually the sampled musical tone and differential signals into a memory storage device,
- reading the stored musical tone and differential signals from the memory storage device,
- reproducing musical tone signals corresponding to the musical tone signals of the plural channels based on the signals read from the memory storage device, and
- providing the reproduced musical tone signals to a tone generator for generating musical tones in response to the musical tone signals.
4 more elements
A compressed musical tone signal storing and reproducing device for plural channels, comprising:
- means for quantizing by binary-coding after sampling either of musical tone signals of at least two of several channels, namely channel A and channel B, with a sampling frequency f1;
- means for quantizing by binary-coding after sampling a differential signal between musical tone signals of said two channels A and B with a sampling frequency f2 (f1>f2);
- a memory storage device for storing individually the quantized musical tone and differential signals,
- means for reading the stored musical tone and differential signals from the memory storage device,
- means for reproducing musical tone signals corresponding to the musical tone signals of the plural channels based on the signals read from the memory storage device, and
- a tone generator for generating musical tones in response to the reproduced musical tone signals.
3 more elements
A compressed musical tone signal storing and reproducing device, comprising
- means for quantizing by binary-coding after sampling a sum signal of musical tone signals of at least two of plural channels, namely channel A and channel B, with a sampling frequency f1;
- means for quantizing by binary-coding after sampling a differential signal between musical tone signals of said two channels A and B with a sampling frequency f2 (f1>f2);
- a memory storage device for storing individually the quantized musical tone and differential signals,
- means for reading the stored musical tone and differential signals from the memory storage device,
- means for reproducing musical tone signals corresponding to the musical tone signals of the plural channels based on the signals read from the memory storage device, and
- a tone generator for generating musical tones in response to the reproduced musical tone signals.
3 more elements
A method for storing musical tone signals for plural channels in compressed fashion, comprising the steps of:
- providing musical tone signals of plural channels;
- determining with a first subtracting means a differential signal between musical tone signals of at least two of the plural channels, namely channel A and channel B;
- sampling a musical tone signal of the channel A or the channel B at a sampling frequency f1;
- quantizing by binary-coding the sampled musical tone signal with n bits;
- sampling the differential signal at a sampling frequency f2 (f1>f2);
- quantizing by binary-coding the sampled differential signal with m bits (n>m);
- storing individually the quantized, sampled musical tone and differential signals into a memory storage device,
- reading the stored quantized, sampled musical tone and differential signals from the memory storage device,
- reproducing musical tone signals corresponding to the musical tone signals of the plural channels based on the signals read from the memory storage device, and
- providing the reproduced musical tone signals to a tone generator for generating musical tones in response to the musical tone signals.
7 more elements
A compressed musical tone signal storing device for plural channels, comprising:
- means for sampling either of musical tone signals of at least two of several channels, namely channel A and channel B, at a sampling frequency f1, and for quantizing by binary-coding the sampled musical tone signal with n bits;
- means for sampling a differential signal between musical tone signals of said channel A and channel B at a sampling frequency f2 (f1>f2), and for quantizing by binary-coding the sampled differential signal with m bits (n>m);
- memories for storing individually the quantized musical tone and differential signals,
- means for reading the stored musical tone and differential signals from the memory storage device,
- means for reproducing musical tone signals corresponding to the musical tone signals of the plural channels based on the signals read from the memory storage device, and
- a tone generator for generating musical tones in response to the reproduced musical tone signals.
3 more elements
A machine-implemented method for transmitting musical tone signals for plural channels in compressed fashion, comprising the steps of:
- providing musical tone signals of plural channels;
- determining with a first subtracting means a differential signal between musical tone signals of at least two of the plural channels, namely channel A and channel B;
- quantizing by binary-coding a musical tone signal of either said channel A or B and said differential signals with n bit and m bits (n>m), respectively;
- and
- providing the quantized musical tone and differential signals to a transmitter for transmitting individually the quantized signals to a peripheral device.
2 more elements
A machine-implemented method for transmitting musical tone signals for plural channels in compressed fashion, comprising the steps of:
- providing musical tone signals of plural channels;
- determining with a first subtracting means a differential signal between musical tone signals of at least two of the plural channels, namely channel A and channel B;
- quantizing by binary-coding the sum signal of musical tone signals of said channels A and B and said differential signal with n bits and m bits (n>m);
- and
- providing the quantized musical tone and differential signals to a transmitter for transmitting individually the quantized signals to a peripheral device.
2 more elements
A machine-implemented method for transmitting musical tone signals for plural channels in compressed fashion, comprising the steps of:
- providing musical tone signals of plural channels;
- determining with a first subtracting means a differential signal between musical tone signals of at least two of the plural channels, namely channel A and channel B;
- sampling the musical tone signal of either said channel A or B and said differential signal with the sampling frequency f1 and f2 (f1>f2), respectively;
- and
- providing the sampled musical tone and differential signals to a transmitter for transmitting individually the sampled signals to a peripheral device.
2 more elements
A machine-implemented method for transmitting musical tone signals for plural channels in compressed fashion, comprising the steps of:
- providing musical tone signals of plural channels;
- determining with a first subtracting means a differential signal between musical tone signals of at least two of the plural channels, namely channel A and channel B;
- sampling a sum signal of musical tone signals of said channels A and B and said differential signal with the sampling frequency f1 and f2 (f1>f2), respectively;
- and
- providing the sampled musical tone and differential signals to a transmitter for transmitting individually the sampled signals to a peripheral device.
2 more elements
A machine-implemented method for transmitting musical tone signals for plural channels in compressed fashion, comprising the steps of:
- providing musical tone signals of plural channels;
- determining with a first subtracting means a differential signal between musical tone signals of at least two of the plural channels, namely channel A and channel B;
- sampling a musical tone signal of the channel A or the channel B at a sampling frequency f1;
- quantizing by binary-coding the sampled musical tone signal with n bits;
- sampling the differential signal at a sampling frequency f2 (f1>f2);
- quantizing by binary-coding the sampled differential signal with m bits (n>m);
- and
- providing the quantized musical tone and differential signals to a transmitter for transmitting individually the quantized signals to a peripheral device.
5 more elements
Dependencies are inferred from the claim text.