Electronic volume varying apparatus restricted by muting mode

An input pulse detecting method, comprising the steps of:

• sampling an input signal in a first sampling period;
• determining when a plurality of successive sampled values of the input signal have a predetermined value;
• sampling the input signal once in a second sampling period longer than the first sampling period:
• and
• sampling the input signal in the first sampling period again.

An input pulse detecting apparatus, comprising:

• pulse inputting means for receiving an input pulse signal from a manually operable audio level controlling means;
• sampling period setting means for alternatively setting a first sampling period or a second sampling period longer than the first sampling period;
• sampling means for sampling the input pulse signal in a sampling period set by said sampling period setting means;
• and
• determining means for successively comparing a sampled value from said sampling means with a predetermined value and, when a plurality of successive sampled values of the input signal from said sampling means have the predetermined value, outputting the input pulse and an input pulse detection signal therefrom;
• wherein said sampling period setting means normally sets the first sampling period, but when the input pulse detection signal is received from said determining means, said sampling period setting means sets the second sampling period once and then sets, when the second sampling period elapses, the first sampling period again.

An electronic volume varying apparatus for producing a controlling signal to control an audio volume level:

• pulse inputting means for receiving an input pulse signal from a manually operable audio level controlling means:
• sampling period setting means for alternatively setting a first sampling period or a second sampling period longer than the first sampling period;
• sampling means for sampling the input pulse signal in a sampling period set by said sampling period setting means;
• determining means for successively comparing a sampled value from said sampling means with a predetermined value and determining an input pulse when a plurality of successive sampled values of the input signal from said sampling means present the predetermined value to output the input pulse and an input pulse detection signal;
• said sampling period setting means normally setting the first sampling period whereas, when the input pulse detection signal is received from said determining means, said sampling period setting means sets the second sampling period once and then sets, when the second sampling period elapses, the first sampling period again;
• pulse counting means for counting the input pulse from said determining means;
• memory means for storing therein an output of said pulse counting means;
• and
• means for generating a controlling signal in response to data stored in said memory means.

A pulse switch apparatus, comprising:

• a manually operable pulse generator for generating pulses in accordance with a direction of operation thereof;
• a pulse presence/absence detector for outputting a pulse non-detection signal when no pulse is received from said pulse generator;
• a timer for outputting a time lapse signal when the pulse non-detection signal from said pulse presence/absence detector has continued for a preset time;
• and
• pulse passage controlling means for ignoring a first pulse from said rotary generator after the time lapse signal is received from said timer but passing therethrough a pulse or pulses following the first pulse.

An electronic volume varying apparatus for producing a controlling signal to control an audio volume level, comprising:

• a manually operable pulse generator for generating pulses in accordance with a direction of operation thereof;
• a pulse presence/absence detector for outputting a pulse non-detection signal when no pulse is received from said pulse generator;
• a timer for outputting a time lapse signal when the pulse non-detection signal from said pulse presence/absence detector has continued for a preset time;
• pulse passage controlling means for ignoring a first pulse from said rotary generator after the time lapse signal is received from said timer but passing therethrough a pulse or pulses following the first pulse;
• pulse counting means for counting the pulses from said pulse passage controlling means;
• memory means for storing therein an output of said pulse counting means;
• and
• means for generating a controlling signal in response to data stored in said memory means.