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    • 3. 发明授权
    • AM stereo decoder for multiple coding systems
    • AM立体声解码器用于多个编码系统
    • US4535470A
    • 1985-08-13
    • US492269
    • 1983-05-06
    • Satoshi YokoyaNorio NumataIkuo Shimizu
    • Satoshi YokoyaNorio NumataIkuo Shimizu
    • H04H1/00H04H40/36H04H5/00
    • H04H20/49
    • Decoding or demodulating circuitry can produce stereo right channel and left channel signals from AM stereo signals that have been coded according to any of the well known methods. A stereo sum signal made up of the left and right channel stereo signals added together, and a stereo difference signal made up of the difference between the stereo left and right channel signals are developed and fed to a matrix to interconnect these signals to extract or separate the left and right channel stereo signals. At least one of the known methods of stereo coding requires phase shifting of these two developed signals and suitable phase shift circuitry, along with a switching circuit provides the matrix with the appropriate signals when that method of stereo coding is employed at the broadcast side. The stereo sum signal is developed using envelope detection and the stereo difference signal is developed using synchronous detection, with the synchronous detector employing signals developed in the envelope detection process. When the stereo broadcasting wave belongs to the other coding systems, the stereo sum and difference signals are respectively supplied directly to the matrix circuit through the switches.
    • 解码或解调电路可以产生根据任何已知方法编码的AM立体声信号的立体声右声道和左声道信号。 将由左和右声道立体声信号相加的立体声和信号和由立体声左右声道信号之间的差组成的立体声差分信号被显影并馈送到矩阵以互连这些信号以提取或分离 左右声道立体声信号。 已知的立体声编码方法中的至少一种需要这两个展开的信号和合适的相移电路的相移,连同开关电路在广播侧采用立体声编码的方法时向矩阵提供适当的信号。 使用包络检测开发立体声和信号,并且使用同步检测开发立体声差分信号,同步检波器采用在包络检测过程中开发的信号。 当立体声广播波属于其他编码系统时,立体声和差分信号通过开关分别直接提供给矩阵电路。
    • 4. 发明授权
    • Apparatus for receiving an AM stereophonic signal
    • 用于接收AM立体声信号的装置
    • US4358638A
    • 1982-11-09
    • US209024
    • 1980-11-21
    • Norio NumataSatoshi Yokoya
    • Norio NumataSatoshi Yokoya
    • H04B1/10H04H1/00H04H40/36H04H40/45H04H5/00
    • H04H20/49
    • Apparatus for receiving an AM stereophonic signal of the type having monaural information represented by amplitude modulations of a signal carrier and stereophonic information represented by phase modulations of the signal carrier. A reference signal generator generates a reference signal that is synchronized with the signal carrier of the received AM stereophonic signal. In one embodiment, the reference signal generator is a phase-locked loop which generates a reference carrier whose frequency is substantially equal to the signal carrier frequency and whose phase is locked to a predetermined signal carrier phase. An amplitude limiter limits the AM stereophonic signal to remove amplitude modulations of the signal carrier and thereby produce an amplitude-limited signal carrier. A demodulator demodulates the information represented by the AM stereophonic signal, and a detector is provided to detect if the stereophonic information will be properly demodulated. A switching arrangement is controlled by the detector to supply the reference signal to the demodulator, whereby the stereophonic information is demodulated, or to supply the amplitude-limited signal carrier to the demodulator, whereby the monaural information is demodulated.
    • 用于接收具有由信号载体的幅度调制表示的单声道信息和由信号载体的相位调制表示的立体声信息的类型的AM立体声信号的装置。 参考信号发生器产生与所接收的AM立体声信号的信号载波同步的参考信号。 在一个实施例中,参考信号发生器是产生参考载波的锁相环,该参考载波的频率基本上等于信号载波频率,并且其相位被锁定到预定的信号载波相位。 幅度限制器限制AM立体声信号以去除信号载波的幅度调制,从而产生限幅信号载波。 解调器解调由AM立体声信号表示的信息,并且提供检测器以检测立体声信息是否将被适当地解调。 开关装置由检测器控制,以将参考信号提供给解调器,由此对立体声信息进行解调,或者将幅度受限的信号载波提供给解调器,从而解调单声道信息。
    • 6. 发明授权
    • AM Stereophonic demodulating circuit
    • AM立体声解调电路
    • US4479234A
    • 1984-10-23
    • US356894
    • 1982-03-10
    • Satoshi YokoyaNorio Numata
    • Satoshi YokoyaNorio Numata
    • H04H1/00H04H40/36H04H5/00
    • H04H20/49H04H40/36
    • In a radio receiver including a demodulating circuit with monaural and stereophonic modes for respectively demodulating a monaural broadcast signal having a carrier amplitude modulated with a monaural signal and demodulating an AM stereophonic broadcast signal having a carrier modulated with the sum and difference of right- and left-channel stereophonic signals and with a relatively low frequency pilot signal, and a tuning section operable for tuning the receiver to receive a broadcast signal whose carrier has a selected frequency; a filter is effective to extract the pilot signal from the received broadcast signal when the latter is an AM stereophonic broadcast signal and the stereophonic mode of the demodulating circuit is established in response to the extracted pilot signal, a disturbance signal generated upon operation of the tuning section or in response to external noise and which is in a frequency range near to the frequency of the pilot signal so as to be possibly extracted with the latter, and thereby confused with the pilot signal for establishing the stereophonic mode, is separately detected, and establishment of the stereophonic mode is prevented, for example, by muting an output of the filter, in response to detection of the disturbance signal while a monaural broadcast signal is being received.
    • 在包括具有单声道和立体声模式的解调电路的无线电接收机中,用于分别解调具有用单声道信号调制的载波幅度的单声道广播信号,并且解调具有用右和左和的和的和差的调制载波的AM立体声广播信号 频道立体声信号和相对较低频率的导频信号,以及调谐部分,其可操作用于调谐接收机以接收其载波具有选定频率的广播信号; 当后者是AM立体声广播信号时,滤波器有效地从接收到的广播信号中提取导频信号,并且响应于提取的导频信号建立解调电路的立体声模式,在调谐操作时产生的干扰信号 分别检测出与外部噪声相对应的频率范围,其频率范围接近于导频信号的频率,以便可能与后者相提取,从而与用于建立立体声模式的导频信号相混淆,并且 例如,通过在接收到单声道广播信号的同时响应于干扰信号的检测而使滤波器的输出静音来防止立体声模式的建立。
    • 9. 发明授权
    • Signal transmitting and/or receiving apparatus
    • 信号发射和/或接收装置
    • US4650928A
    • 1987-03-17
    • US742277
    • 1985-06-07
    • Norio Numata
    • Norio Numata
    • H04B1/40H04B5/00H04M1/00H04M1/727H04Q7/20H04Q7/38H04W88/02H04B7/26H04Q7/04
    • H04M1/727
    • A cordless telephone comprises a base unit and a plurality of remote units. The remote units are respectively adapted to establish radio communication at separate times with the base unit. Each remote unit generates a particular code in a particular format that includes at least one interval in which the particular code is present and at least one interval from which the particular code is absent. The particular code and particular format of each remote unit are different from those of the other remote units. A transmitter in each remote unit transmits the particular code of that unit in the particular format thereof to the base unit. The particular formats are such that the transmission of each particular code periodically corresponds to non-transmission of all of the other particular codes of the remote units. The particular codes can thus periodically be received by the base unit without interference caused by transmission of the other particular codes. The base unit echoes the particular code transmitted by a selected one of the remote units, and each of the remote units detects whether or not its own particular code matches the particular code echoed by the base unit. In response to such a match, a communication channel is established between the base unit and the one of the remote units in which the match occurs. The communication channel while established precludes establishment of a communication channel between the base unit and any of the other remote units.
    • 无绳电话包括基本单元和多个远程单元。 远程单元分别适用于在与基本单元分开的时间建立无线电通信。 每个远程单元以特定格式产生特定代码,其包括存在特定代码的至少一个间隔以及不存在特定代码的至少一个间隔。 每个远程单元的特定代码和特定格式与其他远程单元的特定代码和特定格式不同。 每个远程单元中的发射机将该单元的具体格式的特定码发送到基站单元。 特定格式使得每个特定代码的传输周期性对应于远程单元的所有其他特定代码的不传输。 因此,特定代码可以由基站单元周期性地接收,而不会由其他特定代码的传输引起的干扰。 基本单元回送由所选择的一个远程单元发送的特定代码,并且每个远程单元检测其自己的特定代码是否与基本单元回显的特定代码相匹配。 响应于这种匹配,在基本单元和发生匹配的远程单元之一之间建立通信信道。 所建立的通信信道阻止了在基本单元和任何其它远程单元之间的通信信道的建立。