Sanyo Electric Co., Ltd.

Kyocera Corporation

Tomohiro Yamada

Keiji Hirao

Hitoshi Ogata

Motoe Sakanaka

Takao Terashima

A communication terminal includes a CPU (). The CPU () issues to a router () a send request for requesting the router () to send an ask signal for repetitive responses to a server (). Then, the ask signal is sent to the server () by the router (), and a receive port is temporarily opened. From the server (), a response signal is repeatedly sent in response to the ask signal. To the response signal, time information representative of a waiting time from receiving an ask signal to its reply is attached. A response signal sent back while the receive port is opened arrives at the communication terminal through the router (), but a response signal sent back after the receive port is closed is discarded in the router (). The CPU () repeatedly issues a send request to the router () regarding a time indicated by time information attached to the response signal lastly received as an issuance cycle (T).

Communications terminal with optimum send interval

A content reproducing apparatus includes a CPU. The CPU executes an authentication process with a memory card at a time of starting reproduction. The reproducing apparatus, when succeeding in the authentication process, can obtain from the memory card a decryption key of encrypted music data. Accordingly, by decrypting encrypted content data separately obtained by use of the decryption key, it is possible to reproduce the music data. In such the authentication process, certificate data is utilized in an order which starts from registered identification numbers and, every time failing in the authentication process, is renewed to a next identification number. Consequently, an identification number of certificate data which succeeds in the authentication process is registered and utilized in a next authentication process and the subsequent.

Content reproducing apparatus authenticating detachable recording medium and authentication control method

An IP telephone determines, in making a telephone call, whether a called party's telephone is an IP telephone or not (S). If determination result is affirmative, a flagis turned on (S). Then, a marker indicating that the called party is an IP telephone is added to telephone control information for the called party registered in a telephone directory within a memory (S, S). This makes it possible to know, in making a telephone call to the called party from next time onward, whether the called party's telephone is an IP telephone or not prior to establishment of connection with the called party, from the presence or absence of the marker in the telephone directory.

IP telephone

A signal record reproduction deviceof the invention comprises a microcomputerand a memoryA series of data blocks are divided into a plurality of items of element data. The element data is interleaved and stored to the memoryA memory incorporated in the microcomputerstores a table and a function expression for deriving address data representing an address to store each element data in memory regions positioned sufficiently apart one another in address space.

Interleaving apparatus and deinterleaving apparatus

A content reproduction apparatus includes a CPU, and the CPU measures a power-on time period Ton, which is from a point of time that a main power switchis turned-on until a point of time that it is turned-off, and a power-off time period Toff, which is from a point of time that the main power switchis turned-off until a point of time that it is turned-on once again. Furthermore, a total sum T of the measured time periods Ton and Toff is evaluated, and the audio data is rendered invalid (not reproducible) when the evaluated total sum T exceeds a term of validity Ta of the audio data recorded in a memory card

Content reproduction apparatus

A signal recording apparatus including a battery voltage detecting circuit. The battery voltage detecting circuit detects the voltage value of a battery. When a record button provided on an operation panel is pressed, a syscon detects, for 160 ms, voltage values given from the battery voltage detecting circuit. The detected voltage values are stored to a DRAM. An average calculated of the voltage values of for 160 ms by using the DRAM. The syscon compares the averaged voltage value with a threshold A that makes it possible for recording for one disk. When the averaged voltage value is equal to or higher than the threshold A, the syscon directly starts recording. When the averaged voltage value is lower than the threshold A, an insufficient remaining capacity of the battery is displayed on a liquid crystal panel by a display controller.

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Hyogo, Japan

Tomohiro Yamada