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公开(公告)号：USRE49210E1
公开(公告)日：2022-09-13
申请号：US16556658
申请日：2019-08-30
摘要： A method for processing a digital audio broadcast signal includes: separating an analog audio portion and a digital audio portion of the digital audio broadcast signal; determining the loudness of the analog audio portion and the digital audio portion over a first short time interval; using the loudness of the analog and digital audio portions to calculate a short term average gain; determining a long term average gain; converting one of the long term average gain or the short term average gain to dB; if an output has been blended to digital, adjusting a digital gain parameter by a preselected increment to produce a digital gain parameter; if an output has not been blended to digital, setting the digital gain parameter to the short term average gain; providing the digital gain parameter to an audio processor; and repeating the above steps using a second short time interval.
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公开(公告)号：US09721578B2
公开(公告)日：2017-08-01
申请号：US15178102
申请日：2016-06-09
发明人： Jeffrey Riedmiller , Karl J. Roeden , Kristofer Kjoerling , Heiko Purnhagen , Vinay Melkote , Leif Sehlstrom
CPC分类号： G10L19/24 , G10L19/008 , G10L19/167 , G10L19/18
摘要： On the basis of a bitstream (P), an n-channel audio signal (X) is reconstructed by deriving an m-channel core signal (Y) and multichannel coding parameters (a) from the bitstream, where 1≦m
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3.发明授权Audio network system and method of detecting topology in audio signal transmitting system 有权音频网络系统和音频信号发射系统拓扑检测方法公开(公告)号：US08804968B2
公开(公告)日：2014-08-12
申请号：US13423115
申请日：2012-03-16
CPC分类号： H04L45/00
摘要： In an audio network system constructed from a main node and a plurality of satellite nodes each having a plurality of ports, the main node generates and transmits a main packet including audio signals of a plurality of channels. Each satellite node selects one of the plurality of ports in turn, and confirms whether the main packet arrives at the selected port every predetermined period or not. When the main packet arrives at the selected port every predetermined period, the main packet is received via the port by continuing selection of the port. In the case where reception of the main packet is lost, one is selected from the plurality of ports in turn, the operation to confirm arrival of the main packet is restarted, and another port at which the main packet arrives at the present stage is automatically found.
摘要翻译： 在由主节点和多个卫星节点构成的每个具有多个端口的音频网络系统中，主节点生成并发送包括多个信道的音频信号的主分组。 每个卫星节点依次选择多个端口中的一个，并且每个预定的周期确认主分组是否到达所选择的端口。 当主包每隔预定时间到达所选择的端口时，通过继续选择该端口，经由端口接收主包。 在主分组的接收丢失的情况下，从多个端口依次选择一个，重新开始确认主分组的到达的操作，并且主分组在当前阶段到达的另一个端口是自动的 发现。
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公开(公告)号：US07853021B2
公开(公告)日：2010-12-14
申请号：US11081510
申请日：2005-03-17
申请人： Yung-Chun Lei , Tzueng-yau Lin
发明人： Yung-Chun Lei , Tzueng-yau Lin
CPC分类号： H04B1/0014 , H04L27/0014 , H04N5/4446 , H04N5/607
摘要： The invention discloses a decoding apparatus for decoding an analog audio signal. The decoding apparatus includes an RF tuner, an analog to digital (A/D) converter, a digital down converter, and a programmable digital signal processor (DSP). The RF tuner is used for receiving the analog audio signal and for providing an analog sound intercarrier frequency (SIF) signal indicative thereof. The analog to digital (A/D) converter is used for sampling the analog SIF signal and for converting the signal into a digital SIF signal. The digital down converter is used for down converting the digital SIF signal to generate a baseband signal. The programmable digital signal processor (DSP) is used for demodulating the baseband signal according to a demodulation procedure of a predetermined standard and decoding the demodulated baseband signal to output an output signal in compliance with a decoding procedure of the predetermined standard.
摘要翻译： 本发明公开了一种解码模拟音频信号的解码装置。 解码装置包括RF调谐器，模数（A / D）转换器，数字下变频器和可编程数字信号处理器（DSP）。 RF调谐器用于接收模拟音频信号并用于提供指示其的模拟声音载波间频率（SIF）信号。 模数（A / D）转换器用于对模拟SIF信号进行采样，并将信号转换为数字SIF信号。 数字下变频器用于下变频数字SIF信号以产生基带信号。 可编程数字信号处理器（DSP）用于根据预定标准的解调程序对基带信号进行解调，并对解调的基带信号进行解码，以根据预定标准的解码过程输出输出信号。
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公开(公告)号：US4723287A
公开(公告)日：1988-02-02
申请号：US914008
申请日：1986-10-01
申请人： Katsumi Tobita , Tamaki Yoshimoto
发明人： Katsumi Tobita , Tamaki Yoshimoto
摘要： A demodulating system for the multivoice TV system, which is constituted so that a tuner is tuned to receive the sum signal and the difference signal of an aural signal and a pilot signal which are transmitted together with a video signal, the selected signal is given to an intercarrier demodulator and an aural signal band-pass filter, the intercarrier demodulator provides a beat signal corresponding to the difference between the video carrier and the sound subcarrier, the beat signal is demodulated to obtain the sum signal, and the sound subcarrier provided by the sound signal band-pass filter is demodulated to obtain the difference signal and the pilot signal. The demodulating system is intended to eliminate disturbing signals included in the composite signal and buzzing, and to obviate the malfunction of the MPX decoder due to the disturbing signal having the same frequency as that of the pilot signal.
摘要翻译： 一种用于多传播电视系统的解调系统，其被构造成使得调谐器被调谐以接收与视频信号一起发送的和信号和听觉信号和导频信号的差分信号，所选择的信号被给予 载波解调器和听觉信号带通滤波器，帧载波解调器提供与视频载波和声音副载波之间的差分相对应的拍频信号，对该信号进行解调以获得和信号，并且由 声信号带通滤波器被解调以获得差分信号和导频信号。 解调系统旨在消除复合信号中包含的干扰信号和嗡嗡声，并且由于干扰信号具有与导频信号相同的频率，从而消除MPX解码器的故障。
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公开(公告)号：US4648114A
公开(公告)日：1987-03-03
申请号：US783506
申请日：1985-10-03
申请人： Toshihito Ichikawa
发明人： Toshihito Ichikawa
CPC分类号： H03D1/2236
摘要： An AM stereo demodulator with which the transition from the stereo receiving mode to the monaural receiving mode upon a reduction in the field strength of the received signal is made gradual so as to eliminate an abrupt change in the sound quality. For stereo demodulation, a pair of reference signals are generated which are .pi./2 different in phase for stereo reception. As the field strength of the received signal approaches the level where a phase-locked loop in the demodulator would become unlocked from the carrier of the received signal, the phase difference between the two reference signals is gradually reduced to .pi./4.
摘要翻译： AM立体声解调器在逐渐减小接收信号的场强后，从立体声接收模式向单声道接收模式转换，以消除声音质量的突然变化。 对于立体声解调，产生一对参考信号，其对于立体声接收是相位为π/ 2不同的。 随着接收信号的场强接近解调器中的锁相环将从接收信号的载波解锁的水平，两个参考信号之间的相位差逐渐减小到π/ 4。
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公开(公告)号：US4486898A
公开(公告)日：1984-12-04
申请号：US416327
申请日：1982-09-09
申请人： Satoshi Yokoya
发明人： Satoshi Yokoya
CPC分类号： H04H20/49
摘要： An amplitude limiter for an AM broadcast transmitter to minimize energy in the broadcasted signal outside an allocated broadcast bandwidth. The secondary and higher order spectra (i.e. second and higher harmonics) of a broadcasted AM stereophonic signal are minimized by limiting the amplitude of the audio signal, prior to modulation onto the carrier, within a predetermined portion of the audio frequency range. This is achieved by controlling the gain of the audio signals in that predetermined portion as a function of the level of a submodulation component also within that predetermined portion of the audio frequency range.
摘要翻译： 用于AM广播发射机的限幅器，用于最小化在所分配的广播带宽之外的广播信号中的能量。 广播的AM立体声信号的次级和高阶频谱（即第二和更高次谐波）通过在音频频率范围的预定部分内调制到载波之前将音频信号的幅度限制在最小。 这是通过在该预定部分中的音频信号的增益作为也在音频范围的该预定部分内的子调制分量的电平的函数来实现的。
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8.发明授权
公开(公告)号：US4486897A
公开(公告)日：1984-12-04
申请号：US463813
申请日：1983-02-04
申请人： Kunio Nagai
发明人： Kunio Nagai
摘要： Apparatus for demodulating a multiplexed sound signal comprised of a first sound signal formed by the sum of a left channel signal and a right channel signal in a first language, a second sound signal formed by the difference of the left channel signal and the right channel signal, and a third sound signal in a second language, comprising a single demodulation circuit for producing either the second sound signal or third sound signal in response to the multiplexed sound signal; a selector switch for selectively changing the center frequency of the demodulation circuit to control the latter to produce either the second sound signal or third sound signal in response to the multiplexed sound signal; a matrix circuit for producing a stereo sound signal in response to the first and second sound signals; a pair of output terminals; and a switch device for supplying the third sound signal as a second language monaural sound signal from the demodulation circuit to one output terminal when the selector switch controls the demodulation circuit to produce the third sound signal and for supplying the stereo sound signal to both output terminals from the matrix circuit as a first-language stereo signal when the selector switch controls the demodulation circuit to produce the second sound signal.
摘要翻译： 用于解调由第一语言的左声道信号和右声道信号之和形成的第一声音信号的多路复用声音信号的装置，由左声道信号和右声道信号的差构成的第二声音信号 以及第二语言的第三声音信号，包括响应于所复用的声音信号产生第二声音信号或第三声音信号的单个解调电路; 选择器开关，用于选择性地改变解调电路的中心频率，以响应于所复用的声音信号来控制后者产生第二声音信号或第三声音信号; 用于响应于第一和第二声音信号产生立体声信号的矩阵电路; 一对输出端子; 以及开关装置，用于当选择器开关控制解调电路产生第三声音信号并将立体声信号提供给两个输出端时，将第三声音信号作为第二语音单声道声音从解调电路提供给一个输出端 当所述选择器开关控制所述解调电路以产生所述第二声音信号时，从矩阵电路作为第一语言立体声信号。
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公开(公告)号：US4479234A
公开(公告)日：1984-10-23
申请号：US356894
申请日：1982-03-10
申请人： Satoshi Yokoya , Norio Numata
发明人： Satoshi Yokoya , Norio Numata
摘要： 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.
摘要翻译： 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。
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10.发明授权Sound system having suppression of AM stereophonic receiving circuit-induced noise 失效具有抑制AM立体声接收电路引起的噪声的声音系统
公开(公告)号：US4468537A
公开(公告)日：1984-08-28
申请号：US274613
申请日：1981-06-17
申请人： Tatsuo Numata , Akira Nishioka , Hitoshi Hirata
发明人： Tatsuo Numata , Akira Nishioka , Hitoshi Hirata
摘要： A multi-function sound system including an AM stereophonic receiving function in which interference with operating circuits in modes other than the AM stereophonic mode is eliminated. A limiter receives a IF AM stereophonic received signal and removes the amplitude variation components therefrom and couples the resulting signal to a phase detector composed of a phase-locked loop which produces as an output signal a sub-signal. A switch is provided which deactivates both the limiter and the voltage-controlled oscillator in the phase-locked loop circuit when the sound system is set to other than the AM stereophonic receiving mode.
摘要翻译： 一种多功能音响系统，其包括AM立体声接收功能，其中消除了与AM立体声模式以外的模式的操作电路的干扰。 限幅器接收IF AM立体声接收信号并从其中去除振幅变化分量，并将所得到的信号耦合到相位检测器，该相位检测器由产生作为输出信号的子信号的锁相环构成。 提供了一种开关，当声音系统被设置为不同于AM立体声接收模式时，开关被禁用在锁相环电路中的限幅器和压控振荡器。
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