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41. 发明授权

US4017849A Apparatus for analog to digital conversion 失效
标题翻译：用于模数转换的装置
公开(公告)号：US4017849A
公开(公告)日：1977-04-12
申请号：US608524
申请日：1975-08-28
申请人： Stuart Keene Tewksbury
发明人： Stuart Keene Tewksbury
IPC分类号： H03M3/02 , G06T9/00 , H03M3/04 , H04B14/06 , H03K13/22
CPC分类号： H03M3/04 , G06T9/004
摘要： An input analog signal is converted to a digital output signal by an oversampled predictive DPCM coder which includes an n stage delay line in the feedback loop. The n delay line outputs are weighted by coefficients a.sub.i. . . a.sub.n selected according to the relationship ##EQU1## AND THEN SUMMED. Alternatively, the feedback loop may comprise a chain of n integrators arranged so that the signal fed back to the comparator is the sum of single, double, triple . . . n order integration. By so doing, the coder attenuates the signal power at the quantizer input while the attenuator coefficients are independent of the input signal statistics.A similar technique may also be applied in an oversampled error feedback coder, which includes a feedback loop having an n stage delay line. Here again, the delay line outputs are weighted in accordance with the above relationship. Alternatively, a chain of n integrators may be used in the coder input, and an identical chain employed in the feedback loop. By so doing, the coder attenuates the coding noise power in the signal band while the coder design is rendered independent of the quantizing error statistics.
摘要翻译：输入模拟信号由过采样的预测DPCM编码器转换为数字输出信号，该编码器在反馈回路中包括n级延迟线。 n个延迟线输出由系数ai加权。。。根据的关系选择

42. 发明授权

US3422227A Dual code differential encoding scheme for video signals 失效
标题翻译：双码代码视频信号的差分编码方案
公开(公告)号：US3422227A
公开(公告)日：1969-01-14
申请号：US3422227D
申请日：1965-09-30
申请人： BELL TELEPHONE LABOR INC
发明人： BROWN EARL F
IPC分类号： H03M3/04 , H04N7/32 , H04N21/236 , H04N21/434 , H04B1/66
CPC分类号： H04N21/434 , H03M3/04 , H04N19/124 , H04N19/50 , H04N21/236

43. 发明授权

US3151296A Method and system for transmission of companded pulse code modulated information 失效
标题翻译：用于发送压缩脉冲编码调制信息的方法和系统
公开(公告)号：US3151296A
公开(公告)日：1964-09-29
申请号：US24453162
申请日：1962-12-13
申请人： PHYFE DOUGLAS L
发明人： PHYFE DOUGLAS L
IPC分类号： H03M1/00 , H03M3/04
CPC分类号： H03M3/04

44. 发明授权

US3048781A Reduction of quantizing error in quantized transmission systems 失效
标题翻译：量化传输系统量化误差的降低
公开(公告)号：US3048781A
公开(公告)日：1962-08-07
申请号：US70543457
申请日：1957-12-26
申请人： BELL TELEPHONE LABOR INC
发明人： GLASER JOHN L
IPC分类号： H03M3/04
CPC分类号： H03M3/04

45. 发明授权

US2732424A oliver 失效
公开(公告)号：US2732424A
公开(公告)日：1956-01-24
申请号：US2732424D
IPC分类号： H03M3/04 , H04L25/48
CPC分类号： H03M3/04 , H04N19/593

46. 发明授权

US2605361A Differential quantization of communication signals 失效
标题翻译：通信信号的差分量化
公开(公告)号：US2605361A
公开(公告)日：1952-07-29
申请号：US17121850
申请日：1950-06-29
申请人： BELL TELEPHONE LABOR INC
发明人： CUTLER CASSIUS C
IPC分类号： G06T9/00 , H03M3/04
CPC分类号： H04N19/593 , H03M3/04

47. 发明授权

US11882316B2 System and methods for data compression and nonuniform quantizers 有权
公开(公告)号：US11882316B2
公开(公告)日：2024-01-23
申请号：US17839060
申请日：2022-06-13
申请人： CABLE TELEVISION LABORATORIES, INC.
发明人： Zhensheng Jia , Luis Alberto Campos , Mu Xu , Jing Wang
IPC分类号： H04N19/94 , H04N19/126 , H03M3/00 , H04J14/04 , H03M1/00 , H03M3/04 , H03M1/66 , H03M1/12 , H03M7/30
CPC分类号： H04N19/94 , H03M1/008 , H03M1/1235 , H03M1/664 , H03M3/04 , H03M3/41 , H03M3/504 , H03M7/30 , H04J14/04 , H04N19/126 , H03M7/3082
摘要： An optical network includes a transmitting portion configured to (i) encode an input digitized sequence of data samples into a quantized sequence of data samples having a first number of digits per sample, (ii) map the quantized sequence of data samples into a compressed sequence of data samples having a second number of digits per sample, the second number being lower than the first number, and (iii) modulate the compressed sequence of data samples and transmit the modulated sequence over a digital optical link. The optical network further includes a receiving portion configured to (i) receive and demodulate the modulated sequence from the digital optical link, (ii) map the demodulated sequence from the second number of digits per sample into a decompressed sequence having the first number of digits per sample, and (iii) decode the decompressed sequence.

48. 发明授权

US11687738B2 Chopper stabilized bias unit element with binary weighted charge transfer capacitors 有权
公开(公告)号：US11687738B2
公开(公告)日：2023-06-27
申请号：US17334899
申请日：2021-05-31
申请人： Redpine Signals, Inc.
发明人： Martin Kraemer , Ryan Boesch , Wei Xiong
IPC分类号： G06J1/00 , G06F7/544 , G06G7/16 , H03K19/20 , H03M1/38 , H03M3/04
CPC分类号： G06J1/00 , G06F7/5443 , G06G7/16 , G06F2207/3864 , H03K19/20 , H03M1/38 , H03M3/04
摘要： A Bias Unit Element (UE) has a digital input, a sign input, and a chop clock. The sign input is exclusive ORed with the chop clock to generate a signed chop clock. Each Bias UE comprises a positive Bias UE and a negative Bias UE, each comprising groups of NAND gates generating an output and a complementary output, each of which are coupled to differential charge transfer lines through binary weighted charge transfer capacitors to a differential charge transfer bus comprising a positive charge transfer line and a negative charge transfer line. The chopped sign input enables the positive Bias UE when the sign bit is positive and enables the negative Bias UE when the sign bit is negative.

49. 发明申请

US20180167081A1 DIGITAL TO ANALOGUE CONVERSION 审中-公开
公开(公告)号：US20180167081A1
公开(公告)日：2018-06-14
申请号：US15577637
申请日：2016-05-26
申请人： MQA LIMITED
发明人： John Robert Stuart
IPC分类号： H03M1/66 , H03M1/06 , H03M3/04
CPC分类号： H03M1/661 , H03M1/0639 , H03M1/068 , H03M3/04 , H03M2201/6178
摘要： Devices and methods for digital to analogue conversion (DAC) are provided, in which the analogue outputs of an even number of digital to analogue converters are combined. The individual converters operate on the same data but there is a relative time delay between the input digital signal received by one or more of the converters and the input digital signal received by other of the converters, wherein the delay is a fraction of the data sample period. Moreover, the data signal fed to half of the converters has an inverse relationship with the data signal fed to the other half of the converters and their analogue outputs are subtracted. Dither and filtering techniques may also be employed.

50. 发明授权

US09942682B2 Implementation method and device of multi-bit modulation-based digital speaker system 有权
公开(公告)号：US09942682B2
公开(公告)日：2018-04-10
申请号：US15101147
申请日：2014-12-02
申请人： SUZHOU SONAVOX ELECTRONICS CO., LTD
发明人： Dengyong Ma , Jun Yang , Jianming Zhou , Guoqiang Chai , Yefeng Cai , Yongsheng Mu
IPC分类号： H04S5/00 , G06F3/16 , H03F3/183 , H03F3/185 , H03F3/21 , H03F3/217 , H03F3/68 , H03M3/04 , H03M3/00 , H04R1/00 , H04R3/04 , H04R5/02 , H04R5/04
CPC分类号： H04S5/00 , G06F3/16 , H03F3/183 , H03F3/185 , H03F3/21 , H03F3/217 , H03F3/2175 , H03F3/68 , H03F2200/03 , H03F2200/331 , H03M3/04 , H03M3/338 , H03M3/424 , H03M3/508 , H04R1/005 , H04R3/04 , H04R5/02 , H04R5/04 , H04R2201/403
摘要： The present invention discloses an implementation method and a device of a multi-bit Δ-Σ modulation-based digital speaker system. The method comprises, 1) digital format converting; 2) oversampling interpolation filtering; 3) multi-bit Δ-Σ modulating; 4) thermometer coding; 5) multi-channel mismatch shaping; 6) coding format converting; 7) multi-channel digital power-amplifying; 8) driving a speaker array or a multiple voice coil speaker to sound. The device comprises: a digital input interface, an oversampling interpolation filter, a multi-bit Δ-Σ modulator, a thermometer coder, a multi-channel mismatch shaper, a coding format converter, a multi-channel digital power-amplifier, and a speaker array or a multiple voice coil speaker; each portion being connected in proper order. The present invention can achieve a high-power output under a low-voltage power supply, save power consumption, implement a single-chip integration of a multi-channel reproducing system, reduce the volume and weight of the system and the implementing cost, and improve the quality of the reproduced sound.

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