公开(公告)号：US07457420B2

公开(公告)日：2008-11-25

申请号：US10641004

申请日：2003-08-15

Applicant: Hoang Nhu

Inventor： Hoang Nhu

IPC: H04H20/47 ,  H04H20/88 ,  H04H40/36 ,  H04H20/48 ,  H04H40/54 ,  H04J15/00 ,  H04R5/00 ,  H04N7/00 ,  H04N5/60

CPC classification number: H04N21/426 ,  H04N5/4401 ,  H04N5/46 ,  H04N7/035 ,  H04N21/4263 ,  H04N2005/91364

Abstract: A Japanese BTSC audio broadcast signal has three modes of transmission: mono, stereo, or dual mono. The control channel centering at 3.5 fH is one of the three channels in the J-BTSC signal, and contains information to indicate to the decoder which one of the three modes the audio transmission is in. The present invention uses a bandpass filter directly in the AM band, followed by envelope filtering and a decision circuit. Therefore, the need for AM demodulation and AM carrier detection is eliminated.

Abstract translation: 日本BTSC音频广播信号具有三种传输模式：单声道，立体声或双声道。 以3.5fH为中心的控制信道是J-BTSC信号中的三个信道之一，并且包含用于向解码器指示音频传输的三种模式之一的信息。本发明直接使用带通滤波器 AM频带，随后进行包络滤波和决策电路。 因此，消除了AM解调和AM载波检测的需要。

公开(公告)号：US5507024A

公开(公告)日：1996-04-09

申请号：US245285

申请日：1994-05-16

Applicant: Oliver L. Richards, Jr.

Inventor： Oliver L. Richards, Jr.

IPC: H04H40/54 ,  H04B1/68

CPC classification number: H04H40/54 ,  H04H2201/13

Abstract: An FM stereo radio data-system receiver has a front end including an FM discriminator that produces a composite signal composed of an AM stereo signal, including a 19 KHz pilot, and an AM digital-data signal. A dual-bandwidth phase locked loop (PLL) locks onto the pilot and serves both, as the decoder of the stereo portion of the composite signal, and as a generator of a strong stable 38 KHz carrier for use in regenerating the bit rate clock signal and for decoding the data-symbol signal of the digital-data portion of the composite signal. Advantages include economy of circuitry, a simpler and less costly high pass filter, and greater reliability in the decoding of the data signal.

Abstract translation: FM立体声无线电数据系统接收机具有包括FM鉴频器的前端，FM鉴频器产生由包括19KHz导频的AM立体声信号和AM数字数据信号组成的复合信号。 双带宽锁相环（PLL）锁定在导频上，并且作为复合信号的立体声部分的解码器，并且作为用于再生比特率时钟信号的强稳定的38KHz载波的发生器 并且用于对复合信号的数字数据部分的数据符号信号进行解码。 优点包括电路的经济性，更简单且成本更低的高通滤波器，以及在数据信号的解码中更高的可靠性。

公开(公告)号：US4454607A

公开(公告)日：1984-06-12

申请号：US298008

申请日：1981-08-31

Applicant: Minoru Ogita

Inventor： Minoru Ogita

IPC: H03D1/22 ,  H03J5/02 ,  H04H1/00 ,  H04H40/54 ,  H04H5/00

CPC classification number: H04H40/54 ,  H03D1/22 ,  H03J5/0281

Abstract: An FM stereophonic receiver is arranged so that a central processing unit assigned for selection of a broadcasting station is burdened, based on a clock pulse of the central processing unit, to generate sub-carriers synchronized with a pilot signal contained in a composite signal, for being used in multiplex demodulation, whereby to improve signal-to-noise ratio of the multiplex demodulated signals, and to simplify the circuit arrangement of the receiver.

Abstract translation: FM立体声接收机被布置成基于中央处理单元的时钟脉冲来分配用于选择广播站的中央处理单元，以产生与包含在复合信号中的导频信号同步的副载波，用于 用于多路解调，从而提高多路解调信号的信噪比，并简化接收机的电路布置。

公开(公告)号：US3798550A

公开(公告)日：1974-03-19

申请号：US3798550D

申请日：1972-12-08

Applicant: PIONEER ELECTRONIC CORP

Inventor： TAKAOKA S

IPC: H03D1/22 ,  H03D3/02 ,  H04H1/00 ,  H04H40/54 ,  H04B1/06

CPC classification number: H04H40/54 ,  H03D1/2236

Abstract: A portion of a demodulated signal derived from a demodulator circuit, in an FM receiver having a phase locked loop to generate a subcarrier, is phase-inverted and applied to counterbalance demodulation components generated by a phase comparator circuit of the phase locked loop.

Abstract translation: 在具有产生副载波的锁相环的FM接收机中，从解调电路得到的解调信号的一部分被相位反相并被施加到由锁相环的相位比较电路产生的解调分量的平衡。

公开(公告)号：US12088266B2

公开(公告)日：2024-09-10

申请号：US18345671

申请日：2023-06-30

Applicant: Sonos, Inc.

Inventor： Aurelio Ramos

IPC: H03G11/00 ,  H03G3/30 ,  H03G7/00 ,  H03G9/02 ,  H04R3/00 ,  H04H40/54

CPC classification number: H03G11/00 ,  H03G3/3005 ,  H03G7/002 ,  H03G9/025 ,  H04R3/007 ,  H03G2201/103 ,  H04R2430/01

Abstract: Systems and methods for limiting volume in an audio playback device using a feedback controller are disclosed herein. In one example, a gain stage modulates gain of an audio signal based in part on feedback from a downstream limiter. The gain stage receives a first audio signal as well as a feedback signal from the feedback controller. Based at least in part on the feedback signal from the feedback controller, the gain stage modulates a gain of the first audio signal to provide a second audio signal. The second audio signal is delivered to the limiter, which limits the second audio signal to produce an output signal. The output signal is played back via a transducer. The feedback controller receives a gain reduction value from the limiter and determines a feedback signal to provide to the gain stage upstream of the limiter.

公开(公告)号：US11716065B2

公开(公告)日：2023-08-01

申请号：US17096689

申请日：2020-11-12

Applicant: Sonos, Inc.

Inventor： Aurelio Ramos

IPC: H03G3/00 ,  H03G11/00 ,  H04R3/00 ,  H03G3/30 ,  H03G9/02 ,  H03G7/00 ,  H04R1/00 ,  H04H40/54

CPC classification number: H03G11/00 ,  H03G3/3005 ,  H03G7/002 ,  H03G9/025 ,  H04R3/007 ,  H03G2201/103 ,  H04R2430/01

Abstract: Systems and methods for limiting volume in an audio playback device using a feedback controller are disclosed herein. In one example, a gain stage modulates gain of an audio signal based in part on feedback from a downstream limiter. The gain stage receives a first audio signal as well as a feedback signal from the feedback controller. Based at least in part on the feedback signal from the feedback controller, the gain stage modulates a gain of the first audio signal to provide a second audio signal. The second audio signal is delivered to the limiter, which limits the second audio signal to produce an output signal. The output signal is played back via a transducer. The feedback controller receives a gain reduction value from the limiter and determines a feedback signal to provide to the gain stage upstream of the limiter.

公开(公告)号：US10862446B2

公开(公告)日：2020-12-08

申请号：US15943064

申请日：2018-04-02

Applicant: Sonos, Inc.

Inventor： Aurelio Ramos

IPC: H03G3/00 ,  H03G11/00 ,  H03G3/30 ,  H03G9/02 ,  H03G7/00 ,  H04R3/00 ,  H04H40/54

Abstract: Systems and methods for limiting volume in an audio playback device using a feedback controller are disclosed herein. In one example, a gain stage modulates gain of an audio signal based in part on feedback from a downstream limiter. The gain stage receives a first audio signal as well as a feedback signal from the feedback controller. Based at least in part on the feedback signal from the feedback controller, the gain stage modulates a gain of the first audio signal to provide a second audio signal. The second audio signal is delivered to the limiter, which limits the second audio signal to produce an output signal. The output signal is played back via a transducer. The feedback controller receives a gain reduction value from the limiter and determines a feedback signal to provide to the gain stage upstream of the limiter.

公开(公告)号：US09282417B2

公开(公告)日：2016-03-08

申请号：US13521069

申请日：2011-01-26

Applicant: Aki Sakari Harma ,  Werner Paulus Josephus De Bruijn

Inventor： Aki Sakari Harma ,  Werner Paulus Josephus De Bruijn

IPC: H04H40/54 ,  H04S3/00 ,  H04S5/00

CPC classification number: H04S3/002 ,  H04S5/005 ,  H04S2400/03

Abstract: An apparatus for spatial sound reproduction comprises a receiver (101) for receiving a multi-channel audio signal. An analyzer (107) determines a spatial property of the multi-channel audio signal, such as a spatial complexity or organization. A selection processor (109) then selects a reproduction mode from a plurality of sound reproduction modes where the multi-channel sound reproduction modes employ different spatial rendering techniques. A reproduction circuit (103) then drives a set of loudspeakers (105) to reproduce the multi-channel audio signal using the selected reproduction mode. The switching between the reproduction modes may be fast (e.g. in the order of 100 ms to 10 secs) thereby allowing a short term adaptation of the reproduction mode to the signal characteristics. The approach may in particular provide an improved spatial experience to a listener.

Abstract translation: 用于空间声音再现的装置包括用于接收多声道音频信号的接收器（101）。 分析器（107）确定诸如空间复杂性或组织的多声道音频信号的空间属性。 然后，选择处理器（109）从多声道再现模式中选择再现模式，其中多声道声音再现模式采用不同的空间渲染技术。 再现电路（103）然后使用所选择的再现模式驱动一组扬声器（105）以再现多声道音频信号。 再现模式之间的切换可以是快速的（例如，大约100ms到10sec的顺序），从而允许再现模式对信号特性的短期适应。 该方法可以特别地为收听者提供改进的空间体验。

公开(公告)号：US08731221B2

公开(公告)日：2014-05-20

申请号：US13003369

申请日：2009-07-10

Applicant: Takefumi Ura

Inventor： Takefumi Ura

IPC: H04R25/00 ,  H04H40/54

CPC classification number: H04R25/50 ,  H04R25/453

Abstract: There is provided a hearing aid that reduces a possibility of loss. The hearing aid of the present invention includes a microphone 101 configured to collect sound; a hearing aid processing unit 102 configured to perform hearing aid processing to an input signal from the microphone 101; a speaker 103 configured to output a signal processed by the hearing aid processing unit 102 to the outside; and a drop detection unit 104 configured to detect drop by reference to the input signal from the microphone 101.

Abstract translation: 提供了一种减少丢失可能性的助听器。 本发明的助听器包括被配置为收集声音的麦克风101; 助听器处理单元102，被配置为对来自麦克风101的输入信号进行助听处理; 扬声器103，被配置为将由助听器处理单元102处理的信号输出到外部; 以及下降检测单元104，被配置为通过参考来自麦克风101的输入信号来检测下降。

公开(公告)号：US07856105B2

公开(公告)日：2010-12-21

申请号：US11371543

申请日：2006-03-09

Applicant: Michael G. Kossor ,  Michael Rauh

Inventor： Michael G. Kossor ,  Michael Rauh

IPC: H04H40/54

CPC classification number: H03F1/3235 ,  H03F2200/378 ,  H03F2200/393

Abstract: A feed-forward amplifier includes a main amplifier having input signals and amplified output signals and an error amplifier for amplifying distortion signals to be added to the amplified output signals of the main amplifier to produce an amplifier output. A pilot tone modulation and recovery circuit modulates a pilot tone to be coupled to the input signals of the main amplifier and recovers the pilot tone from the amplifier output. The pilot tone modulation and recovery circuit includes a digital filter and a signal source. The signal source is used to both modulate the pilot tone and control the digital filter for recovering the pilot tone.

Abstract translation: 前馈放大器包括具有输入信号和放大输出信号的主放大器和用于放大要与主放大器的放大输出信号相加的失真信号的误差放大器，以产生放大器输出。 导频音调制和恢复电路调制与主放大器的输入信号耦合的导频音，并从放大器输出中恢复导频音。 导频音调制和恢复电路包括数字滤波器和信号源。 信号源用于调制导频音，并控制数字滤波器以恢复导频音。