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    • 7. 发明申请
    • HIGH SPEED MAGNETIC TAPE INSPECTION EQUIPMENT
    • 高速磁带检测设备
    • WO1981003591A1
    • 1981-12-10
    • PCT/US1981000710
    • 1981-05-26
    • FOTOMAT CORP
    • FOTOMAT CORPWARREN EKINNAMAN DMARTIN L
    • H04N05/78
    • G11B20/00891G11B20/00086G11B20/025G11B27/3018G11B27/322G11B27/36
    • A method and apparatus for automatic high speed inspection of information recorded on magnetic video tape (30) to determine if the original recording has been altered by erasure or overrecording has been added to in a previously unrecorded portion of the tape. To facilitate the inspection, a low frequency signal is added to the audio track of the tape (30) at the time the original recording is made. Inspection consists of sensing the tape's (30) video control track and the audio track containing the added low frequency signal while rewinding the tape at high speed. During rewind, a sensor (32) positioned on the backside or non-oxide coated surface of the tape (30) receives signals from both the video control track and audio track. The detected signals are processed by a fault detection circuit (22) where they are analyzed to determine the tape speed, control track pulse amplitude, audio signals amplitude, control track pulse pattern, and low frequency audio signal pattern. A tape (30) without defects is indicated by the simultaneous absence or presence of both the added low frequency audio track signal and video control track signal. Appearance of either signal alone signals a defect in the tape (30) and its location is stored by a computer (24). At the end of the inspection, the computer (24) prints out (26) the number, type(s) and location(s) of the defect(s).
    • 8. 发明授权
    • Process for reducing the pre-echoes or post-echoes affecting audio
recordings
    • 减少影响音频录音的预回波或后回波的过程
    • US5717768A
    • 1998-02-10
    • US726469
    • 1996-10-04
    • Jean Laroche
    • Jean Laroche
    • G11B20/02G11B20/22H04B3/23H04B3/20
    • H04B3/23G11B20/025G11B20/22
    • For various values of an integer p, short-term discrete Fourier transforms X(p,k) and X.sub..tau. (p,k) of the audio signal shifted by pR samples and of the audio signal shifted by pR+.tau. samples are respectively calculated, R denoting a predetermined integer and .tau. denoting a time shift between the echo and the portion of signal which gave rise to it, a corrected signal is calculated in the frequency domain by nonlinear transformation of X(p,k) taking account, for the various values of the frequency index k, of a value representative of an attenuation factor relating to the echo and of X.sub..tau. (p,k), and a short-term component of a corrected signal is calculated in the time domain by short-term inverse Fourier transform of the corrected signal in the frequency domain. The corrected signal in the time domain is then formed by weighted summation of its short-term components. Application to the digital reprocessing of analog recordings.
    • 对于整数p的各种值,分别计算由pR样本移位的音频信号和由pR + tau样本移位的音频信号的短期离散傅里叶变换X(p,k)和X tau(p,k) R表示指定的整数,τ表示回波与引起它的信号部分之间的时移,通过考虑X(p,k)的非线性变换,在频域中计算校正信号 表示与回波有关的衰减因子的值的频率指标k的值和X tau(p,k)的值和校正信号的短期分量在时域中由短期反相计算 傅立叶变换频域中的校正信号。 然后通过其短期分量的加权求和形成时域​​中的校正信号。 应用于模拟录音的数字再处理。
    • 10. 发明授权
    • Apparatus for reducing noise in audio signals
    • 用于降低音频信号噪声的装置
    • US4648118A
    • 1987-03-03
    • US721646
    • 1985-04-10
    • Shuzo Hitotsumachi
    • Shuzo Hitotsumachi
    • G11B20/02G11B20/24H03G3/34H04B1/12
    • G11B20/24G11B20/025H03G3/345H03G3/348
    • In a rotary head magnetic recording and reproducing system of a helical-scan type for successively recording and reproducing audio signals in and from record patterns on a magnetic tape, which record patterns are inclined relative to the longitudinal direction of the magnetic tape, by a magnetic head provided on a rotary cylinder, during the successive reproduction of the record patterns by the magnetic head, in order to prevent noise from being contained in a reproduced audio signal, which noise is caused by the switching of the record patterns to be reproduced or by the occurrence of a dropout in the reproduced signal, an audio signal is divided into two discrete signals which have a phase difference therebetween and are transmitted respectively on two separate transmission paths, and two hold circuits, each of which is arranged in one of the two transmission paths, are put into operation in synchronism with the switching of the record patterns or the occurrence of the dropout in the reproduced signal, and output signals of the two hold circuits are added together thereby to reduce noise contained in the reproduced output audio signal.
    • 在螺旋扫描型的旋转磁头磁记录和再现系统中,用于连续地在磁带上记录和重放记录图形中的音频信号,并且记录图案相对于磁带的纵向方向倾斜,通过磁 头部设置在旋转圆筒上,在由磁头连续再现记录图形期间,以防止噪声被包含在再现的音频信号中,哪种噪声是由要再现的记录图案的切换引起的, 在再现信号中出现一个压差,音频信号被分成两个离散信号,它们之间具有相位差,分别在两个独立的传输路径上传输,并且两个保持电路分别布置在两个 传输路径与记录模式的切换或者出现丢失的情况同步运行 再现信号和两个保持电路的输出信号相加在一起,从而减少再现的输出音频信号中包含的噪声。