Sound volume controlling apparatus

A sound volume controlling apparatus, comprising:

• key means operable manually for controlling sound volume;
• time period detecting means coupled to said key means for detecting a time period of continuous operation of said key means, said time period beginning after a predetermined constant delay time and ending when the continuous operation of said key means ends;
• wherein the time period detecting means comprises:
• voltage generating means for continuously generating a constant voltage signal when said key means is being operated;
• integrating means for integrating the constant voltage signal generated by said voltage means and generating an output signal responsive to the constant voltage signal;
• and
• detection signal generating means coupled to said integrating means for generating a detection signal when the output signal exceeds a predetermined threshold value;
• sound volume value determining means coupled to said time period detecting means for changing a sound volume value during the time period detected by said time period detecting means;
• and
• sound volume changing means coupled to said sound volume determining means for changing sound in accordance with the sound volume value determined by said sound volume value determining means.

A sound volume controlling apparatus, comprising:

• key means operable manually for controlling sound volume;
• time period detecting means coupled to said key means for detecting a time period of continuous operation of said key means, said time period beginning after a predetermined delay time and ending when the continuous operation of said key means ends;
• sound volume value determining means coupled to said time period detecting means for changing a sound volume value during the time period detected by said time period detecting means;
• sound volume changing means coupled to said sound volume determining means for changing sound in accordance with the sound volume value determined by said sound volume value determining means;
• and
• a microcomputer coupled to said key means and said sound volume changing means, said microcomputer including said time period detecting means and said sound volume value determining means;
• wherein said sound volume value determining means comprises:
• memory means for storing a volume varying ratio;
• timer means for repeatedly counting a predetermined period during the time period detected by said time period detecting means;
• and
• sound volume value changing means for changing the sound volume value by multiplying the sound volume varying ratio stored in said memory means to the sound volume value or by dividing the sound volume value by the sound volume varying ratio, for each predetermined period counted by said timer means.