In a general aspect, a system includes circuitry for providing an engine harmonic scaling module and a summer. The engine harmonic scaling module is configured to receive a torque signal and a throttle signal, process the torque signal to generate a calibrated torque value, process the throttle signal to generate a throttle percentage value, determine a control parameter based on an examination of the calibrated torque value and the throttle percentage value, determine, based on the control parameter, a harmonic-specific scaling factor for each of one or more engine harmonic signals of a plurality of engine harmonic signals, and apply the corresponding harmonic-specific scaling factor to each of the one or more engine harmonic signals to generate corresponding scaled engine harmonic signals. The summer is configured to generate, from the scaled engine harmonic signals, a combined engine harmonic signal.

A user may freely generate a vehicle driving sound using a mounted mobile terminal so as to generate various types of driving sounds through a speaker. A vehicle includes a setting unit configured to set response characteristics of a vehicle driving sound for at least one of a plurality of pieces of vehicle state information and set a section-specific volume of the vehicle driving sound for at least one of a plurality of set response characteristics including revolutions per minute (RPM) and a controller configured to control an output of the vehicle driving sound generated according to a setting of the setting unit and control sound transfer characteristics unique to the vehicle to be reflected when the vehicle driving sound is generated and output.

A method for generating an audio signal for a synthetic noise of a motor vehicle is provided. An audio signal for the synthetic noise of a motor vehicle is also provided. In one step of the method, a signal is provided that represents a noise. Moreover, a fundamental frequency is specified that represents an operating rotational speed of the motor of the vehicle. In another step of the method, several filters are applied to the noise signal. These filters each have a mid-frequency linked to the specified fundamental frequency via an order factor. At least several of the order factors are whole numbers, so that these filters filter the harmonic components of the fundamental frequency. The order factors and the amplitude curves of the filters are selected according to the sound characteristic of the motor vehicle noise that is to be synthesized. The noise signal weighted by the filters constitutes the audio signal for the synthetic noise of the motor vehicle as a function of the operating rotational speed of the motor of the vehicle.

An unmanned aerial vehicle (UAV) may emit masking sounds during operation of the UAV to mask other sounds generated by the UAV during operation. The UAV may be used to deliver items to a residence or other location associated with a customer. The UAV may emit sounds that mask the conventional sounds generated by the propellers and/or motors to cause the UAV to emit sounds that are pleasing to bystanders or do not annoy the bystanders. The UAV may emit sounds using speakers or other sound generating devices, such as fins, reeds, whistles, or other devices which may cause sound to be emitted from the UAV. Noise canceling algorithms may be used to cancel at least some of the conventional noise generated by operation of the UAV using inverted sounds, while additional sound may be emitted by the UAV, which may not be subject to noise cancelation.

There is provided a sound generating device for vehicles that is capable of improving the sensing of acceleration feeling. The sound generating device for vehicles includes an input unit that receives an input of a speed of a vehicle; and a generation unit that generates a sound including a plurality of frequency components when the speed of the vehicle is a first speed. When the speed of the vehicle changes from the first speed to a second speed (higher than the first speed), the generation unit shifts the frequency components included in the sound to a higher frequency side and reduces the sound at a higher frequency band in the shifted frequency components. The generation unit preferably performs pitch shift processing and low pass filter processing (and more preferably performs moving average processing) on the sound.

An engine sound synthesis system is operable to analyze sound. Operation of the system may include providing an input sound signal to be analysed and determining a fundamental frequency of the input signal from the input signal or from at least one guide signal. Furthermore, the frequencies of higher harmonics of the fundamental frequency are determined, thus determining harmonic model parameters. A harmonic signal based on the harmonic model parameters is synthesized and a residual signal is estimated by subtracting the harmonic signal from the input signal. Residual model parameters are estimated based on the residual signal. Furthermore, a corresponding method for synthesizing a sound signal is described.

The invention relates to a method for generating sound for a rotating machine, including a step (E1) of determining the frequencies and amplitudes of n partials and/or harmonics (i) pertaining to the sound of a rotating machine, characterized in that the method includes a step (E2) of determining values (a1) and a step (E7-E8) of calculating a synthetic sound for the rotating machine, said synthetic sound being composed from the n partials and/or harmonics (i), while the frequency thereof is entirely or partially shifted by the values (ai).