公开(公告)号：JPH06214571A

公开(公告)日：1994-08-05

申请号：JP10479393

申请日：1993-04-30

Applicant: YAMAHA CORP

Inventor： SHIBUYA SUKEYUKI

IPC: G10H1/16 ,  G10H1/46 ,  G10K15/04 ,  H03F1/32 ,  H03F3/60 ,  H03G1/04

Abstract: PURPOSE:To enable giving a distortion effect of which distortion start is smooth to an audio signal with simple constitution by providing an adding means which adds each output signal of at least two distortion giving means. CONSTITUTION:This circuit is provided with an input terminal 6 to which a digital audio signal is input, amplification multipliers 7-12 which multiply respectively input data by coefficients for amplification k1-k6 to distort signals, and attenuation multipliers 13-18 which multiply respectively input data by coefficients for attenuation r1-r6. Also, this circuit is provided with an adder 19 which adds each output data of the attenuation multiplier 13-18, an adjustment multiplier 20 which multiplies output data of the adder 19 by a coefficient (m) for adjustment, and an output terminal 21 which outputs an audio signal to which a distortion effect is given. And when signals having desired waveforms inputted to each amplification multiplier 7-12, after distortion effects in which each characteristic is different are given in each amplification multiplier 7-12, they are added in the adder 19.

公开(公告)号：JPH06504653A

公开(公告)日：1994-05-26

申请号：JP50074492

申请日：1991-10-15

IPC: H03G3/00 ,  H03G1/04 ,  H03G3/10 ,  H03G3/30

公开(公告)号：JPH0627671B2

公开(公告)日：1994-04-13

申请号：JP22093990

申请日：1990-08-22

Applicant: SONY TEKTRONIX CORP

Inventor： KEBIN BII MAKUDONARUDO

IPC: G01J1/42 ,  G01D3/02 ,  G01J1/44 ,  G01S7/48 ,  H03F1/32 ,  H03F3/08 ,  H03G1/04

公开(公告)号：JPH065809B2

公开(公告)日：1994-01-19

申请号：JP128687

申请日：1987-01-06

Applicant: NIPPON ELECTRIC CO

Inventor： HIRASAWA MASAHIRO ,  MIURA MASAMI

IPC: H03G1/04 ,  H03G3/10

公开(公告)号：JPH0578965B2

公开(公告)日：1993-10-29

申请号：JP17720485

申请日：1985-08-12

Applicant: TOKYO SHIBAURA ELECTRIC CO

Inventor： FUJII TOSHIKAZU

IPC: H03G1/04 ,  H03G3/10

公开(公告)号：JPH05243880A

公开(公告)日：1993-09-21

申请号：JP4173792

申请日：1992-02-27

Applicant: JAPAN RADIO CO LTD ,  NIPPON TELEGRAPH & TELEPHONE

Inventor： SAKAMOTO HIROTOKU ,  ITO AKIRA ,  NOJIMA TOSHIO

IPC: H03G5/16 ,  H03F1/30 ,  H03F1/32 ,  H03F1/38 ,  H03G1/04 ,  H03H7/25

Abstract: PURPOSE:To realize temperature compensation with simple circuit configuration and to facilitate the control of an FF amplifier. CONSTITUTION:The operations of variable attenuators 14 and 24 and variable phase shifters 16 and 26 provided in a distortion detection loop 10 and a distortion removal loop 22 are controlled by an adder circuit 42. The adder circuit 42 adds a temperature compensating voltage or an adjusting voltage from a heat sensitive element to a control signal from an automatic control circuit 44 and defines that voltage as a control voltage. Since the temperature compensation is realized by the adder circuit 42, the most satisfactory control state is realized even in a free run state. It is not necessary to separately provide any variable attenuator or variable phase shifter for adjusting the FF amplifier. Further, since it is not necessary to separately adjust a main amplifier 18 or an auxiliary amplifier 28, the adjustment is facilitated.

公开(公告)号：JPH05102758A

公开(公告)日：1993-04-23

申请号：JP8541292

申请日：1992-04-07

Applicant: SAMSUNG ELECTRONIC

Inventor： RI KAKIYOU

IPC: H03F3/45 ,  H03G1/00 ,  H03G1/04

Abstract: PURPOSE: To make it possible to control a gain quantity against a large input voltage difference and a high frequency input without distortion by consisting of a 1st and a 2nd micro voltage generating parts, a 1st and a 2nd voltage- current converting parts and current-voltage conversion output part. CONSTITUTION: The 1st micro voltage generating part 10 generates a 1st micro voltage ΔV1 which is to be the tant function of an external bias voltage VB for controlling amplification gain. In the 1st voltage-current converting part 20, conversion is performed by a 1st current I1 of a tanh function having an inverse characteristic to the voltage ΔV1 . On the other hand, in the 2nd micro voltage generating part 30, a 2nd micro voltage ΔV2 which is to be the tanh function of an input high-frequency signal voltage Vin is generated. In the 2nd voltage-current converting part 40, conversion is performed by a 2nd current I2 of the tanh function having an inverse characteristic to the voltage ΔV2 . Thus, linearity is maintained between the current I1 and the current I2 . As the above, the current I1 controlled by the voltage VB and linearly proportioned to the change of the current I2 is converted into a voltage in the voltage conversion output part 50 and outputted to an output signal voltage V0 .

公开(公告)号：JPH0514083A

公开(公告)日：1993-01-22

申请号：JP18522791

申请日：1991-06-29

Applicant: NEC FUKUSHIMA LTD

Inventor： TERAJIMA AKIYOSHI

IPC: H03F3/189 ,  H03G1/04 ,  H03G3/30

Abstract: PURPOSE:To realize an excellent distortion correction characteristic even at a region other than an optimum correction output level in the high frequency amplifier. CONSTITUTION:A high frequency amplifier circuit 5 whose input stage is provided with a variable attenuator 6 for output automatic control and a distortion correction device 7 is provided with a variable attenuator 11 for distortion correction device input adjustment and the attenuation of the variable attenuator 11 for distortion correction device input adjustment is controlled by an external control signal inputted from an output automatic control terminal 4 to implement output automatic control of the amplifier 1, and distortion correction is improved even at a region other than an optimum correction output level by adjusting the input of the distortion correction device 7 in correlation with the output automatic control of the amplifier.

公开(公告)号：JPH0511790A

公开(公告)日：1993-01-22

申请号：JP1139991

申请日：1991-01-07

Applicant: NIPPON ATSUDENKI KK

Inventor： KOSUGA KOJI ,  SEKIGUCHI NORIYUKI

IPC: G09B15/00 ,  G10K15/04 ,  G10K15/12 ,  H03G1/04

Abstract: PURPOSE:To prevent noise by reducing the gain of a VCA(Voltage Control Amplifier) as an attenuator connected to a digital delay circuit during a preset delay time and releasing the VCA from reduction after the ela of the delay time. CONSTITUTION:A microphone amplifier 11 is divided into two passages 12, 13 on the output side which are put together at a terminal 14. The passage 12 is an original sound system and the passage 13 is a delayed artificial sound system. To change a delay time, a VCA17 is operated to reduce the level of a signal from an artificial sound circuit. For the VCA17 as an attenuator function, control voltage up causes a short delay time, and so in this case the control voltage can be lowered. In other wards, as an access pointer operated in the reduction condition of the signal level, a sound signal if any at this time is not present as noise.

公开(公告)号：JPH04172005A

公开(公告)日：1992-06-19

申请号：JP30080590

申请日：1990-11-05

Applicant: MATSUSHITA ELECTRIC IND CO LTD

Inventor： SHIOMI TOMONORI ,  NAGAISHI YASUO

IPC: H03G3/30 ,  H03G1/04 ,  H03G3/02 ,  H03G3/10

Abstract: PURPOSE:To prevent an envelope fluctuation due to a chattering, and to efficiently compensate a temperature by removing the chattering generated in the process of A/D converting a temperature signal including a noise by a hysteresis adding equipment. CONSTITUTION:This device is equipped with a temperature sensor l which measures the atmosphere temperature of an objective equipment 7 whose temperature is to be compensated, and whose gain fluctuates according to the temperature, and outputs an analog signal corresponding to the temperature, an A/D converter 2 which converts the output signal into a digital signal, and a hysteresis adding equipment 3 which adds a hysteresis characteristic to the digital signal. And also, this device is equipped with a memory device 4 which outputs data for compensating the temperature based on the output signal of the hysteresis adding equipment 3, and a variable gain equipment 5 which is serially connected with the equipment 7, and which compensates the gain of the equipment 7 based on the output signal of the memory device 4. That is, the chattering is removed from the digital data including the chattering due to the noise by the hysteresis adding equipment 3. Thus, a temperature compensating device 9 in which the envelope fluctuation due to the chattering due to the noise is not generated, can be obtained.