Method and arrangement for simultaneous recording of incoming and outgoing voice signals with compression of silence periods
First Claim
1. A method for recording in a memory element at least two digital signals having samples of a constant duration containing information bits, wherein a first of said at least two digital signals is an incoming voice channel and a second of said at least two digital signals is an outgoing voice channel, comprising steps in which:
- if voice is detected in a sample of one signal of said at least two digital signals, a sample formed of the sample of said one signal is recorded in the memory element,and if no voice is detected in any of the signals of said at least two digital signals, a special silent period start mark is recorded in the memory element whereafter, when voice is again detected in a sample of any signal of said at least two digital signals, the information about the length of the silent period is recorded in the memory element,wherein, upon a detection of voice activity concurrently in a first concurrent signal and in a second concurrent signal of said at least two digital signals, there is a step of forming from a voice sample of said first concurrent signal and a voice sample of said second concurrent signal a sample to be stored in said memory element.
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Abstract
This invention relates to a method by means of which more than one audio signal can be recorded in compressed form in a memory element, and to a system implementing such a method. In the system according to the invention, audio signal samples are recorded only when voice is detected in the audio signals. The system according to the invention saves memory capacity required by the recording by combining the audio signal samples when voice is detected in samples of more than one audio signal. Furthermore, an audio signal is not recorded when no voice is detected in the signal. The invention also reduces the average computing capacity needed and thus power consumption, since signal combination, or mixing, is advantageously performed only when voice is detected in the samples of more than one audio signal.
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Citations
11 Claims
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1. A method for recording in a memory element at least two digital signals having samples of a constant duration containing information bits, wherein a first of said at least two digital signals is an incoming voice channel and a second of said at least two digital signals is an outgoing voice channel, comprising steps in which:
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if voice is detected in a sample of one signal of said at least two digital signals, a sample formed of the sample of said one signal is recorded in the memory element, and if no voice is detected in any of the signals of said at least two digital signals, a special silent period start mark is recorded in the memory element whereafter, when voice is again detected in a sample of any signal of said at least two digital signals, the information about the length of the silent period is recorded in the memory element, wherein, upon a detection of voice activity concurrently in a first concurrent signal and in a second concurrent signal of said at least two digital signals, there is a step of forming from a voice sample of said first concurrent signal and a voice sample of said second concurrent signal a sample to be stored in said memory element. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A system for recording at least two digital signals comprising samples of constant duration which contain information bits, wherein a first of said at least two digital signals is an incoming voice channel and a second of said at least two digital signals is an outgoing voice channel, the system comprising;
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a mixer element for combining at least part of the signal samples of said at least two digital signals for the recording, a coding element functionally connected to the output of the mixer element for encoding signal samples coming from the output of the mixer element in order to reduce the memory capacity required for the recording of signal samples, and a memory element functionally connected to the output of the coding element for recording the encoded signal samples. - View Dependent Claims (8, 9, 10, 11)
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Specification