A system for controlling convergence of gain to a target value for a variable gain amplifier comprising a detector module configured to determine a magnitude value of a variable gain amplifier output. Also, part of this embodiment is a comparator module configured to compare the magnitude value to a target value and responsive to the comparison, generate an up_dn signal. A digital control module is configured to receive the up_dn signal and processes the up_dn signal to generate a control vector. One or more digital to analog converters are configured to convert the control vector to an analog control signal such that the analog control signal controls the gain of the variable gain amplifier. Various methods of operation exist for this hardware configured to improve convergence time to a target gain value while controlling the rate of change of the gain.

The present technology relates to a sound processing device, a method, and a program capable of suppressing an excessive amplitude and obtaining higher quality of sound. A sound processing device includes: a prediction value calculation unit that calculates a prediction value of a displacement of a speaker according to an input signal supplied to the speaker on the basis of an equivalent model of the speaker; and an amplitude control unit that performs amplitude control on the input signal in a case in which the prediction value is greater than a predetermined threshold value. The present technology can be applied to a sound reproduction system.

A wideband variable gain amplifier (VGA) having a low phase change is disclosed. The first VGA amplifies an input signal by a current steering manner so that an amplification gain is variable. The larger a variable gain amount of the first output signal amplified by the first VGA is, the more a relative phase change amount gradually increases in either positive direction or negative direction. The second VGA further amplifies the first amplified output signal in the current steering manner so as to vary the amplification gain. As a variable gain amount of a second output signal amplified by the second VGA becomes larger, a relative phase change amount gradually increases in a direction opposite to the phase change direction of the first VGA. This opposing phase changes of the first and second VGAs are canceled against each other to provide a variable amplification gain over the wideband frequency range with a low phase change.

A wideband variable gain amplifier (VGA) having a low phase change is disclosed. The first VGA amplifies an input signal by a current steering manner so that an amplification gain is variable. The larger a variable gain amount of the first output signal amplified by the first VGA is, the more a relative phase change amount gradually increases in either positive direction or negative direction. The second VGA further amplifies the first amplified output signal in the current steering manner so as to vary the amplification gain. As a variable gain amount of a second output signal amplified by the second VGA becomes larger, a relative phase change amount gradually increases in a direction opposite to the phase change direction of the first VGA. This opposing phase changes of the first and second VGAs are canceled against each other to provide a variable amplification gain over the wideband frequency range with a low phase change.

An audio mixing device includes a gain setting circuit configured to set first to n-th gains based on a command input from the outside, n being an integer of two or more, and a mixing circuit configured to output a mixing signal obtained by mixing two or more of first to n-th multiplication data obtained by respectively multiplying first to n-th audio data by the first to n-th gains. In a case where the j-th gain of the first to n-th gains is set to a first value, when the j-th gain is to be set to a second value different from the first value, the gain setting circuit transitions the j-th gain from the first value to the second value in a stepwise manner in a j-th gain change section of first to n-th gain change sections.

A system for controlling convergence of gain to a target value for a variable gain amplifier comprising a detector module configured to determine a magnitude value of a variable gain amplifier output. Also, part of this embodiment is a comparator module configured to compare the magnitude value to a target value and responsive to the comparison, generate an up_dn signal. A digital control module is configured to receive the up_dn signal and processes the up_dn signal to generate a control vector. One or more digital to analog converters are configured to convert the control vector to an analog control signal such that the analog control signal controls the gain of the variable gain amplifier. Various methods of operation exist for this hardware configured to improve convergence time to a target gain value while controlling the rate of change of the gain.

The present technology relates to a sound processing device, a method, and a program capable of suppressing an excessive amplitude and obtaining higher quality of sound. A sound processing device includes: a prediction value calculation unit that calculates a prediction value of a displacement of a speaker according to an input signal supplied to the speaker on the basis of an equivalent model of the speaker; and an amplitude control unit that performs amplitude control on the input signal in a case in which the prediction value is greater than a predetermined threshold value. The present technology can be applied to a sound reproduction system.

An audio mixing device includes a gain setting circuit configured to set first to n-th gains based on a command input from the outside, n being an integer of two or more, and a mixing circuit configured to output a mixing signal obtained by mixing two or more of first to n-th multiplication data obtained by respectively multiplying first to n-th audio data by the first to n-th gains. In a case where the j-th gain of the first to n-th gains is set to a first value, when the j-th gain is to be set to a second value different from the first value, the gain setting circuit transitions the j-th gain from the first value to the second value in a stepwise manner in a j-th gain change section of first to n-th gain change sections.