An improved method for compressing a cyclic analog signal in which adjacent positive and negative half cycles are similar, such as an audio signal, and for reconstructing or synthesizing a new analog signal from the compressed signal. The original signal is compressed by removing one of the positive or the negative half cycles and, in a preferred embodiment, digitizing the remaining half cycles. The new analog signal is generated by sequentially applying each half cycle to an output and simultan...

Apparatus, for determining the glottal waveform of a subject, is disclosed which comprises a hard-walled, uniform, cylindrical, acoustic waveguide having a cross-sectional area commensurate with that of the vocal tract of the subject. The waveguide is terminated at one end to substantially reduce acoustic wave reflections. A microphone is positioned within the wall of the waveguide to detect and convey to suitable instrumentation the glottal waveform of the subject.

A method of compressing or expanding the frequency of signals while keeping the signals' original gross temporal relationship relies upon an electrooptical processor. An apertured mask is interposed between an area-array charge coupled device (CCD) and a light emitting diode (LED). Optical signals are emitted from the LED at a clock rate which is the same as the vertical shift rate of charge packets in the CCD. Sampling the CCD's horizontal shift register output at varying rates allows a changin...

System and method utilizing the temporal separation and amplitude differences of signals for transmitting the signals in a bandwidth corresponding to one half of the frequency range present in the signals.

Audio data is converted into a digital format at a selectable conversion rate and applied through a microprocessor into memory storage. Stored data is selectively recalled and reconverted into an analog format for reconstruction into human speech at a processing rate independent of the input storage rate. The write pointer address and the read pointer address during the storage and retrieval of data are maintained within a selected address differential in accordance with the input data rate and ...

An adaptive data compression device for compressing data having variable frequency content, including a plurality of digital filters for analyzing the content of the data over a plurality of frequency regions, a memory, and a control logic circuit for generating a variable rate memory clock corresponding to the analyzed frequency content of the data in the frequency region and for clocking the data into the memory in response to the variable rate memory clock.

A sound compression/decompression peripheral which operates with a host computer or other remote sound data storage device. The peripheral comprises a plurality of hand operable switches which may be dedicated to functions to which users of tape recorders are accustomed such as "RECORD" "PLAY" "STOP" "REWIND" "FAST FORWARD" and "PAUSE". The switches may also perform other functions. One possible embodiment of the peripheral comprises: a microphone; a speaker; a .mu.Law codec which converts the a...

Random access solid state memory is used for storing and playing back audio information. Compressed audio information is downloaded to the memory from an audio information source. The operator actuates apparatus for selecting information to be played back from the random access solid state memory.

An acoustic analysis device using a reduced scale model comprises a model of a reduced scale of 1/n, a loudspeaker and a microphone provided in the model, a sound signal forming circuit for forming a signal to be radiated by AD-converting an analog signal to be measured at a predetermined sampling frequency, storing the converted signal in a first RAM, reading out the stored signal at a first sampling clock and DA-converting the read out signal, a collected sound reproducing circuit for reproduc...

In a method and circuit configuration for non-linear linkage of two binary words, a first method step is performed by shifting a first binary word to the right by a number of places associated with the first method step, and adding the unchanged first binary word thereto. N--2 further method steps are performed by shifting an outcome of addition of a preceding method step to the right by one place and by a number of places in respective method steps, and adding the unchanged first binary word th...