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| Number | Title | Issue Date |
| 4222394 | System for processing a waveform for a larynx stroboscope A device for processing a waveform for a larynx stroboscope having a plurality of filters receiving a vocal cord vibration signal. The outputs of the plurality of filters are automatically switched over by subjecting the outputs of the plurality of filter... | 09/16/1980 |
| 4216354 | Process for compressing data relative to voice signals and device applying said process A voice signal is transmitted digitally at reduced bit rate by use of data compression. The original frequency components of a telephone band width of the voice signal sampled at 8 KHz and quantized with 12 bits are transformed into three parameters: SIGN... | 08/05/1980 |
| 4157457 | Frequency analyzer comprising a digital band-pass and a digital low-pass filter section both operable in a time-division fashion A frequency analyzer of a predetermined number of channels comprises a digital band-pass and a digital low-pass filter section. A preselected number of digital samples sampled with a sampling period are stored in a buffer memory to be read out in each sam... | 06/05/1979 |
| 4149039 | Frequency band compression of FDM using time expansion A frequency band compression method, using Time Compression, for use with a frequency division multiplex (FDM) signal carrying voice signal. On the transmission end, the multiplexed signal is divided into a plurality of time segments, each segment having ... | 04/10/1979 |
| 4131765 | Method and means for improving the spectrum utilization of communications channels A system and method for improving the spectrum utilization of communications channels. In certain embodiments of the invention a plurality of narrowband communications channels are used to transmit a multiplicity of speech signals. In another embodiment o... | 12/26/1978 |
| 4086431 | Compression system System for the vocoder transmission of speech signal with reduced bandwidth. The speech signal is split into a low-frequency part and a high-frequency part. The high-frequency part is subdivided into a number of sub-bands and for each sub-band a control s... | 04/25/1978 |
| 4015087 | Spectrograph apparatus for analyzing and displaying speech signals Apparatus which provides a real time sound spectrogram of signals such as speech which are complex in their frequency content and also vary rapidly in time, is described. A visual display device such as a scan converter and video monitor is provided which... | 03/29/1977 |
| 3995115 | Speech privacy system The communication of confidential information is generally accomplished by transforming applied message waves into an unintelligible form prior to transmission. Such a transformation may be accomplished by scrambling the applied message waves in either th... | 11/30/1976 |
| 3976842 | Analog rate changer An analog rate changer which has a pair of fall-through registers that are controlled to develop analog output signals which bear substantially the same wave shape and amplitude information borne by the analog input signals, but which have a selected grea... | 08/24/1976 |
| 3967067 | Secret telephony 1. In a system of secret transmission of speech, means to subdivide speech waves constituting a message into a plurality of narrow frequency bands, means to integrate the energy in each band, means individual to said bands to subdivide the integrated ener... | 06/29/1976 |
| 3952164 | Vocoder system using delta modulation A speech transmission system employing a semi-vocoder comprising a spectral analyzer and a spectral synthesizer for the upper frequency range of the speech signal. The speech signal in the low frequency range base band is transmitted by using delta modula... | 04/20/1976 |
| 3946162 | System for transferring wideband sound signals A system for transmitting wideband signals, for example speech, over a narrow band is proposed. Lower frequency range signals are directly transmitted and amplitude information of partial upper frequency ranges is transmitted on pilot frequencies. At a re... | 03/23/1976 |
| 3945002 | Block digital processor for use with nonuniformly encoded digital words A digital processor apparatus is described which operates upon nonuniformly encoded digital words each one of which has μ-law encoded format of a sign bit to indicate polarity, segment bits to indicate range, and interval bits to indicate the location of... | 03/16/1976 |
| 3936610 | Dual delay line storage sound signal processor Sound signals are processed for compression or expansion utilizing storage and frequency transformation into storage delay lines operated alternately to transform alternate segments of the sound signal respectively with the outputs of the two delay lines ... | 02/03/1976 |
| 3934094 | Frequency band converter A frequency band converter wherein a signal whose frequency band is to be converted is written in a random access memory at a predetermined cycle while the contents of the random access memory are read out sequentially at a cycle different from the writin... | 01/20/1976 |
