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    • 1. 发明申请
    • FM transmitter device
    • FM发射机设备
    • US20080176524A1
    • 2008-07-24
    • US12007631
    • 2008-01-14
    • Yukinaga KoikeYuichi Miyashita
    • Yukinaga KoikeYuichi Miyashita
    • H04B1/04
    • H04B1/04
    • An FM transmitter device having an audio signal processing compression unit for logarithmically compressing an audio signal, an FM broadband transmission single chip IC receiving as inputs a modulated signal from the audio signal processing compression unit and a channel frequency setting signal C, operating upon receipt of a reference clock, and transmitting an FM high frequency wave, a SAW resonator configuring a locally oscillator, a 700 MHz band SAW oscillation circuit, a mixing circuit for mixing the non-modulated high frequency wave from this oscillation circuit and the FM high frequency wave from the FM broadband transmission single chip IC and converting the frequency, and a SAW filter for eliminating an unrequired frequency among mixed waves from the mixing circuit and extracting a high frequency component in the 200 MHz band or the 800 MHz band, whereby an FM transmitter device which is small in size and lower in power consumption and can obtain a high S/N ratio is provided.
    • 具有用于对数压缩音频信号的音频信号处理压缩单元的FM发射机装置,接收来自音频信号处理压缩单元的调制信号作为输入的FM宽带传输单芯片IC和频道设定信号C, 参考时钟,发送FM高频波,配置本地振荡器的SAW谐振器,700MHz频带SAW振荡电路,用于混合来自该振荡电路的非调制高频波的混频电路和FM高频波 从FM宽带传输单芯片IC转换频率,以及SAW滤波器,用于消除来自混合电路的混合波中的不需要的频率,并提取200MHz频带或800MHz频带中的高频分量,由此FM发射机 提供尺寸小,功耗更低并且可以获得高S / N比的装置。
    • 4. 发明授权
    • Diversity receiver with switching noise reduction
    • 具有开关噪声降低的分集接收器
    • US5465411A
    • 1995-11-07
    • US167332
    • 1993-12-15
    • Yukinaga Koike
    • Yukinaga Koike
    • H04B1/10H04B7/08H04B1/06
    • H04B7/0805H04B7/0831
    • A diversity FM receiver of the antenna switching system type which includes first and second antennas, an antenna switching circuit, an FM receiving unit and a sample hold circuit. The receiving unit functions to demodulate the wave signal input thereto and to output a wave detection signal. The switching circuit switches the signal received from one antenna or the other antenna to the receiving unit in accordance with the amplitude of the wave detection signal. The sample hold circuit maintains the voltage of the wave detection signal during switching at the value of the signal immediately before switching.
    • 包括第一和第二天线的天线切换系统类型的分集FM接收机,天线切换电路,FM接收单元和采样保持电路。 接收单元用于解调输入到其中的波信号并输出​​波检测信号。 开关电路根据波检测信号的幅度将从一个天线或另一个天线接收的信号切换到接收单元。 采样保持电路在切换之前立即保持信号切换期间的波检测信号的电压。
    • 5. 发明授权
    • Wireless microphone apparatus and transmitter device for a wireless microphone
    • 用于无线麦克风的无线麦克风设备和发射机设备
    • US06778814B2
    • 2004-08-17
    • US09746338
    • 2000-12-20
    • Yukinaga Koike
    • Yukinaga Koike
    • H04B102
    • H04B1/04H04R2420/07
    • A compact and lightweight wireless microphone and transmitter. The transmitter is connected to the microphone using a standard connector. The transmitter includes a low-frequency amplifier for amplifying a received voice signal and a surface acoustic wave oscillator providing a high-frequency oscillation signal. A modulator combines the amplified voice signal and the high frequency oscillation signal into a modulated signal. The modulated signal is amplified using a high-frequency amplifier to create a high-frequency modulated signal. The high-frequency modulated signal is output as radio waves through an antenna. A power supply is included for powering the transmitter. To improve sound quality, the transmitter additionally includes a compander circuit for improving signal-to-noise ratio and increasing a dynamic range through a logarithmic compression algorithm. Also, a pre-emphasis circuit which reduces noise by providing higher gain in the high frequency amplification than in the low frequency amplification.
    • 紧凑轻便的无线麦克风和发射器。 发射器使用标准连接器连接到麦克风。 发射机包括用于放大接收的语音信号的低频放大器和提供高频振荡信号的表面声波振荡器。 调制器将放大的语音信号和高频振荡信号组合成调制信号。 使用高频放大器对调制信号进行放大,以产生高频调制信号。 高频调制信号通过天线输出为无线电波。 包括电源为发射机供电。 为了提高声音质量,发射机还包括用于通过对数压缩算法提高信噪比并增加动态范围的压缩扩展电路。 此外,预加重电路通过在高频放大中提供比低频放大中更高的增益来降低噪声。
    • 7. 发明授权
    • Wireless microphone use UHF band carrier FM transmitter
    • 无线麦克风使用UHF频段载波FM发射机
    • US06246864B1
    • 2001-06-12
    • US09159393
    • 1998-09-23
    • Yukinaga Koike
    • Yukinaga Koike
    • H04B104
    • H04B1/034
    • A wireless microphone use UHF band carrier FM transmitter adopting a PLL system, which has a voltage controlled crystal oscillation type modulator (VCXO) for performing FM modulation on an oscillation frequency of a crystal oscillation circuit by an input of a modulation signal AF of an acoustic signal and which uses an FM modulated signal fr obtained from the VCXO as a reference signal Vr to be input to an analog phase comparator (PC) of a PLL circuit 60. The PC performs a phase comparison operation at a high speed (10 MHz or more), therefore a cutoff frequency of a loop filter (62) may be a high band frequency of about 100 KHz to 1 MHz so that the cutoff frequency considerably higher than the highest audible frequency 20 KHz can be selected. The filter output moves at an inaudible frequency and therefore there is no audible noise generated even due to vibration, feedback, etc. It is also possible to make the charge pump circuit and other steps for shielding against interference and steps for giving resistance to vibration superfluous without adopting the loop filter switching system, therefore a reduction of size and a lowering of cost can be realized.
    • 无线麦克风使用采用PLL系统的UHF频带载波FM发射机,其具有电压控制晶体振荡型调制器(VCXO),用于通过声学的调制信号AF的输入对晶体振荡电路的振荡频率进行FM调制 信号,并且使用从VCXO获得的FM调制信号fr作为参考信号Vr输入到PLL电路60的模拟相位比较器(PC).PCC以高速(10MHz或 更多),因此环路滤波器(62)的截止频率可以是约100KHz至1MHz的高频带频率,使得可以选择明显高于最高可听频率20KHz的截止频率。 滤波器输出以不可听见的频率移动,因此即使由于振动,反馈等原因也不会产生可听见的噪声。还可以使电荷泵电路和其他步骤用于屏蔽干扰,并提供阻抗多余的步骤 不采用环路滤波器切换系统,因此可以实现尺寸的减小和成本的降低。