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1. 发明专利

JP2001352391A SPEECH UNIT IN MOBILE PHONE 失效
公开(公告)号：JP2001352391A
公开(公告)日：2001-12-21
申请号：JP2000171065
申请日：2000-06-07
申请人： PIONEER ELECTRONIC CORP , PIONEER TOHOKU CORP
发明人： SATO KOICHI , SHIDARA KAZUMI
IPC分类号： H04M1/60 , H04B7/26 , H04M1/00
摘要： PROBLEM TO BE SOLVED: To provide a speech unit in a mobile phone that discriminates whether the mobile phone is in a transmission state or a call receiving state and automatically sets the mobile phone to a speech state when the mobile phone is in the call receiving state without the need for pushbutton operations. SOLUTION: A call transmission/receiving state discrimination circuit 15 detects a call transmission state by a detection output of a microphone bias detection circuit 11 or a speaker tone detection circuit 12 and detects the call receiving state by an output of a transmission radio wave detection circuit 14. When the discrimination circuit 15 detects the call receiving state, the circuit 15 drives an integration circuit 16. The integration circuit 16 delays a detection signal of the speaker tone detection circuit 12 that detects a ringer melody or a call bell tone generated from the mobile phone in this case. Thus, using the delayed detection signal by a prescribed time for a trigger drives a pulse generating circuit 17, a switch drive circuit 18 receiving the pulse output of the circuit 17 generates a drive signal to close a control switch 5. Thus, the mobile phone of a caller is connected to a line thereby the mobile phone is brought to a speech state.

2. 发明专利

JP2001028795A ZOOM MICROPHONE 失效
公开(公告)号：JP2001028795A
公开(公告)日：2001-01-30
申请号：JP19991599
申请日：1999-07-14
申请人： PIONEER ELECTRONIC CORP , PIONEER TOHOKU CORP
发明人： SHIDARA KAZUMI , SATO KOICHI , NAKAYAMA MASAHIRO
IPC分类号： H04R5/027 , H04R1/02 , H04R1/40 , H04R3/00
摘要： PROBLEM TO BE SOLVED: To provide a zoom microphone that is simple in the configuration and miniaturized and configured to be a so-called plug-in type. SOLUTION: The zoom microphone is provided with an L ch microphone 11L, a center microphone 11S and an R ch microphone 11R that are arranged parallel to a sound picking up face, resistors R1, R2 connected in series between a wire (a) of the L ch microphone 11L and a wire (b) of the R ch microphone 11R, a microphone side terminal s1 connected to the center microphone 11S, a resistor side terminal s2 connected to a connection part between the resistors R1, R2, and an earth terminal s3 connected to a reference level point via a capacitor C, and a changeover switch SW that is thrown to a position to connect the microphone side terminal s1 and the resistor side terminal s2 in a zoom mode or to a position to connect the resistor side terminal s2 and an earth terminal s3 in a stereo mode.

3. 发明专利

JP2003152461A PHOTODETECTING CIRCUIT 审中-公开
公开(公告)号：JP2003152461A
公开(公告)日：2003-05-23
申请号：JP2001346203
申请日：2001-11-12
申请人： PIONEER ELECTRONIC CORP , PIONEER TOHOKU CORP
发明人： SATO KOICHI , SHIDARA KAZUMI
IPC分类号： H04R1/10 , H03F3/16 , H03F3/68
摘要： PROBLEM TO BE SOLVED: To provide a photodetecting circuit which can be suitably used as a wireless headphone or the like and which can prevent a composite output signal from suffering a loss even when a plurality of photodetectors are disposed isolatedly from each other. SOLUTION: A plurality of photoelectric converters respectively receive light signals and convert the signals into electric signals, and output the signals to output terminals. The output terminals of the photoelectric converters are connected to a common connecting point, and the output signals of the respective converters are combined. The signal of a predetermined frequency is extracted from the combined output signal via a filter circuit. Since the output signals of the converters are output from the drain terminals of source grounding circuits, a transmission loss between the converters and the filter circuit can be reduced.

4. 发明专利

JPH0583032A CRYSTAL OSCILLATION CIRCUIT 失效
公开(公告)号：JPH0583032A
公开(公告)日：1993-04-02
申请号：JP24195891
申请日：1991-09-20
申请人： PIONEER ELECTRONIC CORP
发明人： NAKAYAMA MASAHIRO , SHIDARA KAZUMI , KOMATSUBARA MASAHIKO
IPC分类号： H03B5/32 , H03C3/22 , H04B1/034
摘要： PURPOSE:To attain excellent oscillation without interference of plural crystal oscillators and without need of a correction circuit by providing a short-circuit means short-circuiting the crystal oscillators except one crystal oscillator among the plural crystal oscillators to the crystal oscillation circuit. CONSTITUTION:When a basic frequency control signal Vfd is at, e.g. a low level and an input terminal a1 and an output terminal y1 of a switching circuit S2 are conductive, a VCO 13 is oscillated based on a reactance component of a crystal oscillator X1 and other crystal oscillator X2 is short-circuited via terminals a2, y2. Then when the basic frequency control signal Vfd is at a high level and an input terminal b1 and the output terminal y1 of the switching circuit S2 are conductive, the VCO 13 is oscillated based on a reactance component of a crystal oscillator X2 and the one crystal oscillator X1 is short-circuited via terminals b2, y2. Since the short-circuited crystal oscillator gives no effect on the crystal oscillator during oscillation, the interference between the crystal oscillators is avoided.

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