Recording For Changing Duration, Frequency Or Redundant Content Of An Analog Signal Patents (Class 360/8)
  • Patent number: 4303950
    Abstract: In a magnetic recording and reproducing system of the type wherein a plurality of rotating magnetic heads record the video signal on a magnetic tape as tracks which are inclined at an angle relative to the direction of travel of the magnetic tape, the audio signal is time compressed and recorded by the rotating magnetic heads on tracks contiguous with either or both ends of said video signal recording tracks, whereby even at a considerably low tape transport speed the audio signal may be recorded in a stable manner.
    Type: Grant
    Filed: July 12, 1979
    Date of Patent: December 1, 1981
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Hiroshi Taniguchi, Osahiko Yano, Chojuro Yamamitsu, Sadafumi Kitamura, Masamitsu Ohtsu
  • Patent number: 4301480
    Abstract: Apparatus for monitoring reproduced audio signals during fast playback operation comprises a bucket-brigade device for storing pieces of audio information reproduced from a recording medium at a high speed. The stored pieces of information are read out in a sequence at a slower speed than they were stored when the magnitude of the reproduced audio signal exceeds a predetermined value so that the audio information will be restored to the original pitch to be monitored. The interval for which an audio signal is stored in the bucket-brigade device may be controlled in accordance with the speed of the recording medium.
    Type: Grant
    Filed: April 11, 1980
    Date of Patent: November 17, 1981
    Assignee: Victor Company of Japan, Limited
    Inventor: Masatsugu Kitamura
  • Patent number: 4246617
    Abstract: Representation of a speech signal by its short-time Fourier transform and the application of this representation to the problem of time compression and expansion of speech are presented. A time-frequency representation for linear time-varying systems is applied to a model for speech production to formulate a quasi-stationary representation for the speech waveform. This representation has the property that simple time scaling of the parameters of the representation corresponds to changing the rate of the speech. Given a real speech signal, short-time Fourier analysis provides a technique for estimating and modifying these parameters. The results of the theoretical analysis are used to design a high-quality speech rate-change system which are simulated on a general-purpose digital mini-computer.
    Type: Grant
    Filed: July 30, 1979
    Date of Patent: January 20, 1981
    Assignee: Massachusetts Institute of Technology
    Inventor: Michael R. Portnoff
  • Patent number: 4246615
    Abstract: A composite video signal recording and reproducing system also records and reproduces an audio signal after their conversion into a digital signal. The recording system converts an input analog audio signal into a digital signal and generates a synchronizing signal corresponding to a synchronizing signal of the composite video signal. There is a time-axis compression of the converted digital signal so that they do not exist in the period corresponding to the synchronizing signal. A level-setter sets the level of the digital signal which has been compressed at a value which is lower than the white peak level of the composite video signal. A mixer mixes the level set digital signal and the generated synchronizing signal, to obtain a composite digital signal. The composite digital signal is supplied to the recording and/or reproducing apparatus and recorded on a recording medium.
    Type: Grant
    Filed: December 15, 1978
    Date of Patent: January 20, 1981
    Assignee: Victor Company of Japan, Limited
    Inventors: Yuma Shiraishi, Akira Hirota
  • Patent number: 4206476
    Abstract: A system for using a video signal recorder/playback device of the type normally adapted to record and/or reproduce video signals on a record medium, for recording and/or reproducing pulse signals on the record medium. The system includes time-compression/time-expansion apparatus for compressing the time domain of the pulse signals which are to be recorded and for expanding the time domain of the pulse signals which are reproduced.
    Type: Grant
    Filed: November 21, 1978
    Date of Patent: June 3, 1980
    Assignee: Sony Corporation
    Inventor: Yoshitaka Hashimoto
  • Patent number: 4157571
    Abstract: Apparatus under control of an operator for selectively displaying signals stored on a magnetic tape. The tape is normally first played back at a high speed, with the reproduced signal displayed at high speed to permit the operator to determine which parts of the tape to view at real-time speed. In the real-time viewing mode, a segment of the tape is played again at high speed to provide a better quality signal; the signal from the segment is converted to digital form and stored in a memory for use in creating a real-time display. The operator then can view the display of the stored signal in a variety of ways: stationary, advancing at real-time speed, or in reverse at real-time speed. The length of the segment stored is relatively short to minimize the size of the memory. After a segment is played back, the tape is brought to a stop and then moved in the opposite direction to position it for playing back the next segment.
    Type: Grant
    Filed: May 20, 1977
    Date of Patent: June 5, 1979
    Assignee: Del Mar Avionics
    Inventor: Stephen K. Shu
  • Patent number: 4141039
    Abstract: An addressable memory is supplied with pulse coded data at a first rate for writing such data into addressable locations in the memory; and stored data is read out from addressable locations at another rate different from the write-in rate. One advantageous application of such a memory is for changing the time-axis parameter, such as the repetition rate, of data so as to effect time compression and/or expansion. Control over the memory is achieved by generating write clock pulses and read clock pulses at different repetition rates. Data, such as a pulse data bit, is written into an addressable location in the memory during the interval between successive write clock pulses. A data pulse bit is read out of the memory during the interval between successive read clock pulses. The read operation is delayed in the event that it coincides with a write operation.
    Type: Grant
    Filed: February 8, 1977
    Date of Patent: February 20, 1979
    Assignee: Sony Corporation
    Inventor: Kaichi Yamamoto
  • Patent number: 4138694
    Abstract: A video signal recorder/reproducer is used to record and/or reproduce pulse signals in successive tracks on a record medium. During recording, the pulse signals, which may, as one example, represent audio information, are interleaved with simulated horizontal and vertical synchronizing signals of the type similar to the synchronizing signals which normally are included in a composite video signal. During signal reproduction, the reproduced simulated horizontal and vertical synchronizing signals are detected and used to control the recovery of data from the reproduced pulse signals.
    Type: Grant
    Filed: February 23, 1977
    Date of Patent: February 6, 1979
    Assignee: Sony Corporation
    Inventors: Toshitada Doi, Akira Iga
  • Patent number: 4134134
    Abstract: A Hadamard domain encoder wherein adding and subtracting operations on digitized intensities of 2 .times. 2 picture points yield secondary results. Likewise processing of groups of 2 .times. 2 secondary results yields further intermediate and/or final results. The complement of unprocessed secondary and final results fully characterizes the original picture but is better suited for data storage and/or transfer because the energy content of the picture is substantially restricted to a limited region. Redundancy in the stored/transmitted data is thus reduced.
    Type: Grant
    Filed: June 8, 1977
    Date of Patent: January 9, 1979
    Assignee: U.S. Philips Corporation
    Inventor: Peter Lux
  • Patent number: 4130739
    Abstract: Dictating apparatus is enhanced for normal and conference speech recording by simple circuitry for detecting "long periods of silence" and compressing the record during these periods, as for example by discontinuing the recording process. Starting and stopping the recording transducing apparatus is a basic concept. Conventional recording apparatus is adapted to function under control of circuitry using available digital circuit modules. Analog speech and like waves are converted to incremental digital form by delta modulating circuitry. "Silence periods" are recognized by digital sensing circuitry coupled to triggering logical control circuitry for operating the recording apparatus only in the presence of desired sound. Basically a predetermined series of indications of "silence" serve to trigger a latching flip-flop circuit for disabling substantially conventional dictating apparatus and the like until the desired sound resumes and the latching circuit is reset for continuing the recording of dictation.
    Type: Grant
    Filed: June 9, 1977
    Date of Patent: December 19, 1978
    Assignee: International Business Machines Corporation
    Inventor: Michael A. Patten
  • Patent number: 4075665
    Abstract: A method of recording and reproducing audio information on a disc shaped record carrier. During recording the audio information is divided into consecutive information segments of a duration .tau..sub.t. Each information segment is subjected to time compression before recording. The duration .tau..sub.t and the time compression are selected so that optimum use is made of the recording capacity of the record carrier without information loss. During reproduction the information segments are subjected to a complementary time expansion and recombined in their original sequence.
    Type: Grant
    Filed: July 7, 1976
    Date of Patent: February 21, 1978
    Assignee: U.S. Philips Corporation
    Inventors: Jean Paul Borne, Geert Jan Naaijer
  • Patent number: 4071716
    Abstract: A dictation system with several remote stations and at least one central station. Each remote station includes a recording and playback machine for recording dictation at normal record carrier transport speed, and upon completion of the dictation said dictation can be transmitted to and recorded on the machine of the central station in continuous form at a higher speed of transport, actuation of the switching means for transmission being cancelled by changing the record carrier in the remote station machine.
    Type: Grant
    Filed: October 20, 1975
    Date of Patent: January 31, 1978
    Assignee: U.S. Philips Corporation
    Inventors: Hermann Bretschneider, Herman Pieter Hueber, Friedrich Louzil
  • Patent number: 4065795
    Abstract: In the recording of audio-video programs in which the audio is time-compressed and converted into television format, the video frames associated with a given audio frame are recorded in a group immediately following the audio frame, and picture-change cue signals are recorded at selected lines within the audio frame so that on playback, displayed video can be changed at preselected points in the audio frame playback. A number of video frames can be recorded between successive audio frames wihtout introducing any discontinuity in audio playback.
    Type: Grant
    Filed: December 4, 1975
    Date of Patent: December 27, 1977
    Assignee: Westinghouse Electric Corporation
    Inventor: Harold B. Shutterly
  • Patent number: 4065794
    Abstract: In an audio-video program consisting of time compressed segments of audio information in the format of TV lines and video change signals associated with one or more of the audio segments, and video information to be displayed in response to the video change signals stored in separate portions of a magnetic or video storage medium, the playback of video information is synchronized to the playback of audio information by the occurrence of the video change signals present in the recorded audio information.
    Type: Grant
    Filed: December 4, 1975
    Date of Patent: December 27, 1977
    Assignee: Westinghouse Electric Corporation
    Inventor: Harold B. Shutterly
  • Patent number: 4045819
    Abstract: An apparatus is described for recording and playing back video frames with associated audio signals for use with a conventional television display. A magnetic loop is employed to store video frames for display with associated audio information being placed as a separate frame on another magnetic medium. A full program of video and audio frames may be received and selected from a remote transmitter and appropriately located on a magnetic medium for sequential display on the television display. A first embodiment uses a cassette tape with a video loop for storage and playback of a program. A second embodiment uses a pair of multiple track belts for program storage and playback. Pilot signals are employed to precisely store the video frames on the video loop and to automatically sequence the display and sound projection of the multiple video and associated audio frames.
    Type: Grant
    Filed: November 28, 1975
    Date of Patent: August 30, 1977
    Assignee: Goldmark Communications Corporation
    Inventor: Peter C. Goldmark
  • Patent number: 4020291
    Abstract: A system for time compression and expansion of audio signals comprises a filter for filtering the fundamental frequency component of an input signal reproduced at a speed differing from that at the time of recording, first and second memory devices for carrying out writing in or memorizing and reading out at speeds in accordance with the frequency of applied clock pulses, a control signal forming circuit for forming gate control signals and clock pulse signals of different frequency from the output fundamental frequency component of the filter in synchronism with the pitch period thereof, and gates controlled by the gate control signals to pass or not pass the output signals of the first and second memory devices. A time compressed or expanded signal synchronized with the pitch period of the fundamental frequency component of the input signal is led out through these gates.
    Type: Grant
    Filed: August 20, 1975
    Date of Patent: April 26, 1977
    Assignee: Victor Company of Japan, Limited
    Inventors: Masatsugu Kitamura, Harukuni Kobari
  • Patent number: 3997913
    Abstract: Electronic signals are compressed or expanded by writing periodic samples the signal onto one side of a thin magnetic disc at a first rate and then reading the samples off the other side of the disc at a second, and different, rate. In another embodiment of the invention, the samples are written onto a rotating magnetic ring or disc by a plurality of write/erase heads which are selectively gated to the signal source. The samples are then read off the disc by a plurality of read-heads which are selectively gated to the external load.
    Type: Grant
    Filed: January 9, 1975
    Date of Patent: December 14, 1976
    Assignee: The United States of America as represented by the Secretary of the Army
    Inventor: Otto E. Rittenbach
  • Patent number: 3975763
    Abstract: A signal time compression or expansion system comprises a plurality of gates for permitting the passage of reproduced signals successively with respectively different time bands in contiguous sequence or with partially overlapping parts and without discontinuity with respect to time, the signals having been reproduced with a frequency spectrum scale differing from that at the time of recording, a plurality of memory circuits provided to correspond respectively to the plurality of gates and operating to write in and store the signals thus passed through the corresponding gates, a control circuit for controlling the memory circuits thereby to cause the same to carry out writing in and reading out with respectively specific write-in periods and read-out periods, and a mixer for mixing the signals thus read out from the memory circuit and combining the same into one continuous signal.
    Type: Grant
    Filed: April 29, 1974
    Date of Patent: August 17, 1976
    Assignee: Victor Company of Japan, Limited
    Inventor: Masatsugu Kitamura
  • Patent number: 3953680
    Abstract: Apparatus for remotely controlling automatic telephone answering devices or the like to transcribe message information magnetically recorded by the telephone answering apparatus. The apparatus includes an oscillator coupled to an input/output transducer for generating a tone of a predetermined frequency which is coupled via a telephone to the automatic telephone answering apparatus. The tone switches the answering apparatus into a high speed rewind mode wherein the message information is not muted. The message information is recorded in reverse on a magnetic tape in the transcribing apparatus by a tape transport mechanism transporting the tape in a forward direction during a record operation. During playback, the tape transport mechanism transports the tape in the reverse direction so that the reverse recorded message information is played back in an intelligible manner to convey the recorded message information.
    Type: Grant
    Filed: December 4, 1974
    Date of Patent: April 27, 1976
    Assignee: GTE Automatic Electric Laboratories Incorporated
    Inventor: Joseph J. Zimmermann
  • Patent number: 3938189
    Abstract: An apparatus is described for recording and playing back video frames with associated audio signals for use with a conventional television display. A magnetic loop is employed to store video frames for display with associated audio information being placed on a separate frame on another magnetic medium. A full program of video and audio frames may be received and selected from a remote transmitter and appropriately located on a magnetic medium for sequential display on the television display. A first embodiment uses a cassette tape with a video loop for storage and playback of a program. A second embodiment uses a pair of multiple track belts for program storage and playback. Pilot signals are employed to precisely store the video frames on the video loop and to automatically sequence the display and sound projection of the multiple video and associated audio frames.
    Type: Grant
    Filed: October 13, 1972
    Date of Patent: February 10, 1976
    Assignee: Goldmark Communications Corporation
    Inventor: Peter C. Goldmark