Communication apparatus

A communication apparatus comprising:

• reception means for receiving a signal;
• memory means for storing a level of a first signal received by said reception means in accordance with a reference level registration instruction;
• and
• control means for performing communication control including mute control when the level of the first signal stored in said memory means is higher than a level of a second signal received by said reception means during a communication period.

A communication apparatus comprising:

• reception means for receiving a signal;
• memory means for storing levels of a plurality of reference signals received by said reception means in accordance with a registration instruction;
• and
• control means for performing communication control including mute control when one of the levels of the plurality of reference signals stored in said memory means is higher than a level of a communication signal received by said reception means.

A communication apparatus comprising:

• reception means for receiving a signal;
• memory means for storing a level of a first signal received by said reception means, wherein said memory means stores a level of a second signal;
• and
• control means for performing mute control when the level of the first signal stored in said memory means is higher than a level of a third signal received by said reception means,
• wherein said control means discriminates the presence or absence of a carrier in accordance with a comparison between the level of the second signal and the third signal received by said reception signal and further performs communication control in accordance with the presence or absence of the carrier.

A communication method comprising the steps of:

• receiving a signal;
• storing a level of a first signal received in said receiving step in accordance with a registration instruction;
• detecting the absence of a carrier when the level of the first signal stored in said memory step is higher than a level of a second signal received in said receiving step;
• and
• performing communication control in accordance with the absence of the carrier.

A communication apparatus comprising;

• reception means for receiving a signal;
• memory means for storing a level of a first signal and a level of a second signal received by said reception means;
• and
• control means for detecting the absence of a carrier when the level of the first signal stored in said memory means is higher than a level of a third signal received by said reception means, and for performing communication control in accordance with the absence of the carrier,
• wherein said control means controls a mute circuit in accordance with the level of the second signal.

A communication apparatus comprising;

• reception means for receiving a signal;
• memory means for storing a level of a first signal and a level of a second signal received by said reception means;
• and
• control means for detecting the absence of a carrier when the level of the first signal stored in said memory means is higher than a level of a third signal received by said reception means, and for performing communication control in accordance with the absence of the carrier,
• wherein said control means controls a filter in accordance with the level of the second signal.

A communication apparatus comprising;

• reception means for receiving a signal;
• memory means for storing levels of a plurality of reference signals received by said reception means;
• and
• control means for performing communication control including mute control when one of the levels of the plurality of reference signals stored in said memory means is higher than a level of a communication signal received by said reception means,
• wherein the plurality of reference signals include a second reference signal for removing noises from the communication signal.

A communication apparatus comprising;

• reception means for receiving a signal;
• memory means for storing a level of a first signal received by said reception means, wherein said memory means stores a level of a second signal;
• and
• control means for performing mute control when the level of the first signal stored in said memory means is higher than a level of a third signal received by said reception means, and for performing noise reduction control in accordance with a comparison result between the level of the second signal and the third signal received by said reception means.

A communication method comprising the steps of:

• receiving a signal;
• storing a level of a first signal and a level of a second signal received in said receiving step;
• detecting the absence of a carrier when the level of the first signal stored in said memory step is higher than a level of a third signal received in said receiving step;
• performing communication control in accordance with the absence of the carrier;
• and
• controlling a mute circuit in accordance with the level of the second signal.

A communication method comprising the steps of:

• receiving a signal;
• storing a level of a first signal and a level of a second signal received in said receiving step;
• detecting the absence of a carrier when the level of the first signal stored in said memory step is higher than a level of the third signal received in said receiving step;
• performing communication control in accordance with the absence of the carrier;
• and
• controlling a filter in accordance with the level of the second level.