Regurating sound generating system for environment friendly vehicle and a method for controlling the system

A method for controlling an environmentally-friendly vehicle sound generator control apparatus which includes:

• a storage unit including a sound source storage unit for storing a plurality of frequency band-specific sample sound source data of a real single engine sound of an internal combustion engine vehicle, and a reference data storage unit for storing frequency band-specific reference sound level data;
• a sound output unit arranged in an environmentally-friendly vehicle to output a pedestrian's vehicle recognition sound;
• a sound sensing unit arranged to be spaced apart from the sound output unit to sense the pedestrian's vehicle recognition sound output from the sound output unit;
• a sound source sound extraction unit for extracting and dividing the pedestrian's vehicle recognition sound sensed by the sound sensing unit for each of a plurality of frequency bands;
• a control unit for storing the frequency band-specific sound data of the pedestrian's vehicle recognition sound extracted and divided by the sound source sound extraction unit in a sound storage unit of the storage unit;
• and a sound playback unit including a sound comparison unit for comparing the frequency band-specific reference sound level data with the extracted plurality of frequency band-specific sound data for each frequency band in response to a comparison control signal of the control unit, a sound control unit for controlling the pitch or the volume of the plurality of frequency band-specific sample sound source data to form a plurality of frequency band-specific sample control sound source data if the extracted plurality of frequency band-specific sound data is smaller than the frequency band-specific reference sound level data, and a sound mixing unit for mixing the plurality of frequency band-specific sample control sound source data and transferring the mixed plurality of frequency band-specific sample control sound source data to the sound output unit so that the sound output unit can output the pedestrian's vehicle recognition sound, the method comprising:
• a provision step of providing the environmentally-friendly vehicle sound generator control apparatus;
• a sensing step of sensing, by the sound sensing unit, a pedestrian's vehicle recognition sound output from the sound output unit of an environmentally-friendly vehicle;
• a sound extraction and storage step of extracting and dividing the pedestrian's vehicle recognition sound sensed by the sound sensing unit for each of a plurality of frequency bands and storing the extracted and divided pedestrian's vehicle recognition sound in the sound storage unit of the storage unit;
• a sound comparison step of comparing the frequency band-specific reference sound level data with the extracted plurality of frequency band-specific sound data in response to a comparison control signal of the control unit;
• and
• a sound control step of forming a plurality of frequency band-specific sample control sound source data by controlling the pitch or the volume of the plurality of frequency band-specific sample sound source data if the extracted plurality of frequency band-specific sound data is smaller than the frequency band-specific reference sound level data at the sound comparison step.

An environmentally-friendly vehicle sound generator control apparatus comprising:

• a storage unit including a sound source storage unit for storing a plurality of frequency band-specific sample sound source data of a real single engine sound of an internal combustion engine vehicle, and a reference data storage unit for storing frequency band-specific reference sound level data;
• a sound output unit for outputting a pedestrian's vehicle recognition sound;
• a sound source sound extraction unit for extracting and dividing the pedestrian's vehicle recognition sound output from the sound output unit for each of a plurality of frequency bands;
• a control unit for storing the frequency band-specific sound data of the pedestrian's vehicle recognition sound extracted and divided by the sound source sound extraction unit in a sound storage unit of the storage unit;
• and
• a sound playback unit including a sound comparison unit for comparing the frequency band-specific reference sound level data with the extracted plurality of frequency band-specific sound data for each frequency band in response to a comparison control signal of the control unit, a sound control unit for controlling the pitch or the volume of the plurality of frequency band-specific sample sound source data to form a plurality of frequency band-specific sample control sound source data if the extracted plurality of frequency band-specific sound data is smaller than the frequency band-specific reference sound level data, and a sound mixing unit for mixing the plurality of frequency band-specific sample control sound source data and transferring the mixed plurality of frequency band-specific sample control sound source data to the sound output unit so that the sound output unit can output the pedestrian's vehicle recognition sound.

A method for controlling an environmentally-friendly vehicle sound generator control apparatus, which includes:

• a storage unit including a sound source storage unit for storing a plurality of frequency band-specific sample sound source data of a real single engine sound of an internal combustion engine vehicle, and a reference data storage unit for storing frequency band-specific reference sound level data;
• a sound output unit for outputting a pedestrian's vehicle recognition sound;
• a sound source sound extraction unit for extracting and dividing the pedestrian's vehicle recognition sound output from the sound output unit for each of a plurality of frequency bands;
• a control unit for storing the frequency band-specific sound data of the pedestrian's vehicle recognition sound extracted and divided by the sound source sound extraction unit in a sound storage unit of the storage unit;
• and a sound playback unit including a sound comparison unit for comparing the frequency band-specific reference sound level data with the extracted plurality of frequency band-specific sound data for each frequency band in response to a comparison control signal of the control unit, a sound control unit for controlling the pitch or the volume of the plurality of frequency band-specific sample sound source data to form a plurality of frequency band-specific sample control sound source data if the extracted plurality of frequency band-specific sound data is smaller than the frequency band-specific reference sound level data, and a sound mixing unit for mixing the plurality of frequency band-specific sample control sound source data and transferring the mixed plurality of frequency band-specific sample control sound source data to the sound output unit so that the sound output unit can output the pedestrian's vehicle recognition sound, the method comprising:
• a provision step of providing the environmentally-friendly vehicle sound generator control apparatus;
• a sensing step of sensing, by the sound sensing unit, a pedestrian's vehicle recognition sound output from the sound output unit of an environmentally-friendly vehicle;
• a sound extraction and storage step of extracting and dividing the pedestrian's vehicle recognition sound sensed by the virtual sound sensing unit for each of a plurality of frequency bands and storing the extracted and divided pedestrian's vehicle recognition sound in the sound storage unit of the storage unit;
• a sound comparison step of comparing the frequency band-specific reference sound level data with the extracted plurality of frequency band-specific sound data in response to a comparison control signal of the control unit;
• and
• a sound control step of forming a plurality of frequency band-specific sample control sound source data by controlling the pitch or the volume of the plurality of frequency band-specific sample sound source data if the extracted plurality of frequency band-specific sound data is smaller than the frequency band-specific reference sound level data at the sound comparison step.